View source for SECM112

== Module ==
[[Image:ECM-5644A-112-048-1202-xD.jpg|200px|112 Pin ECM-OH]] 

<br/>
==Overview==
The SECM112  is part of the engine management system for on-highway applications, which can include L6 4-stroke CNG intercity transit applications, L6, 4-stroke LNG intercity transit applications, and L4 4-stroke commercial vehicle applications.  The module is capable of full authority digital engine control (FADEC) consisting of fuel, spark, and air delivery to the engine. Additional inputs and outputs are available to control
other system functions, as defined by software.   This unit provides 112 connector pins with inputs, outputs, and communications interfaces that support a wide variety of applications.

The SECM112 features two microprocessors in one rugged production intent housing.  The module contains a main MPC5644 120Mhz processor along with a S12G fixed point processor, which can provide question-answer type challenge to the main processor.  Both micros are connected on CAN1.

The SECM112 is part of the MotoHawk Control Solutions ControlCore® family of embedded control systems. The ControlCore operating system,
MotoHawk® code generation product, and MotoHawk’s suite of development tools enable rapid development of complex control systems.  Application code for both processors is developed in MotoHawk which allows the application developer to create applications directly in Simulink and build with a one step 'CNTL-B' build.   The two controllers act like separate controllers in terms of programming.  Then, the program can be flashed onto the micro using Woodward's MotoTune, Toolkit, or through industry standard 3rd party tools via xCP, or ISO15765.    

Calibration can  be done with Woodward's MotoTune or Toolkit or with industry standard 3rd Party tools through xCP.

Each controller is available in ‘F’ (Flash) or ‘C’ (Calibratible) versions. Flash modules are typically used for production purposes. Calibratible modules are typically for prototyping/development only; they can be calibrated in real time using MotoTune, ToolKit, or industry standard 3rd party tools via xCP.

<br/>

== Power Requirements ==
All versions of the SECM112 Control require a voltage source of 8 to 32Vdc (12Vdc or 24Vdc nominal).

<br/>

== MotoHawk Requirements ==
MotoHawk 2012bSP0 or higher is required for SECM112 MY12 hardware.<br/>
MotoHawk 2018bSP0 or higher is required for SECM112 MY18 hardware.<br/>
MotoHawk 2021aSP2 or higher is required for SECM112 MY20 hardware.

<br/>

== Compilers ==
'''Main Micro''': Green Hills 4.2.4 or GCC PowerPC eabi SPE 4.6

'''Auxillary''':  NXP (formally Freescale) CodeWarrior 4.6 or 5.2

https://www.nxp.com/support/developer-resources/software-development-tools/codewarrior-development-tools/codewarrior-legacy/codewarrior-development-studios/codewarrior-for-microcontrollers/codewarrior-development-studio-for-hcs12x-microcontrollers-classic-ide-v5.2:CW-HCS12X

<br/>

== Datasheets ==
[http://www.woodward.com/?s=36364 SECM112 Datasheet (36364)]

[http://www.woodward.com/?s=26634 SECM112 Installation Manual (26634)]

SECM112 Hardware Manual is publication '''26686''', but this document is not available for download from the public website.

== Product Change Notices ==
[http://www.woodward.com/?s=b06961 SECM112 MY18 PCN (06961)]


== Part Numbers ==
{| class="wikitable"
|-
! colspan=3 style="height:50px"|MY12 Hardware
|-
! Part Num <br/> x=Inactive !! HW Version !! Features
|-
<!-- original SECM112 -->
| &nbsp;1751-6601  &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1204.html ECM-5644A-112-048-1204 (DEV)]  || 2 H-bridge, 6 Injectors Development 
|-
| &nbsp;1751-6605 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5642A-112-049-1200.html ECM-5642A-112-049-1200 (PROD)] || 2 H-bridge, 6 Injectors Production
|-
! colspan=3 style="height:50px" |MY18 Hardware
|-
! Part Num <br/> x=Inactive !! HW Version !! Features
<!-- Model Year 18 SECM112 -->
|-
| &nbsp;1751-6815 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1809.html ECM-5644A-112-048-1809 (DEV)]  || 2 H-bridge, 6 Injectors Development (replaces 1751-6601)
|-
| &nbsp;1751-6812 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5642A-112-049-1804.html ECM-5642A-112-049-1804 (PROD)] || 2 H-bridge, 6 Injectors Production (replaces 1751-6605)
|-
| &nbsp;1751-6816 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1807.html ECM-5644A-112-048-1807 (DEV)] || 3 H-bridge, No Injectors Development 
|-
| &nbsp;1751-6813 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5642A-112-049-1802.html ECM-5642A-112-049-1802 (PROD)] || 3 H-bridge, No Injectors Production
|-
| &nbsp;1751-6817 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1812.html ECM-5644A-112-048-1812 (DEV)] || 3 H-bridge, 4 Injectors Development 
|-
| &nbsp;1751-6814 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5642A-112-049-1805.html ECM-5642A-112-049-1805 (PROD)] || 3 H-bridge, 4 Injectors Production
|-
| &nbsp;1751-6827 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1813.html ECM-5644A-112-048-1813 (DEV)] || 2 H-bridge, 6 Injectors Development, No CAN Termination
|-
| &nbsp;1751-6826 &nbsp;<b>x</b>|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5642A-112-049-1806.html ECM-5642A-112-049-1806 (PROD)] || 2 H-bridge, 6 Injectors Development, No CAN Termination
|-
! colspan=3 style="height:50px" |MY20 Hardware
|-
! Part Num <br/> x=Inactive !! HW Version !! Features
<!-- Model Year 20 SECM112 -->
|-
| &nbsp;1751-6854|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-2017.html ECM-5644A-112-048-2017 (DEV/PROD)] || 2 H-bridge, 6 Injectors, No UEGO1 replaces 1751-6815 and 1751-6812)
|-
| &nbsp;1751-6852|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-2015.html ECM-5644A-112-048-2015 (DEV/PROD)] || 3 H-bridge, No Injectors, No UEGO1 (replaces 1751-6816 and 1751-6813)
|-
| &nbsp;1751-6857|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-2020.html ECM-5644A-112-048-2020 (DEV/PROD)] || 3 H-bridge, 4 Injectors, UEGO1, SPK7-SPK8 (replaces 1751-6817 and 1751-6814)
|-
| &nbsp;1751-6858|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-2020.html ECM-5644A-112-048-2017 (DEV/PROD)] || 2 H-bridge, 6 Injectors, No UEGO1, No CAN Termination (replaces 1751-6827)
|-
| &nbsp;1751-6863|| [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-2023.html ECM-5644A-112-048-2023 (DEV/PROD)] || 3 H-bridge, 4 Injectors, No UEGO1

|}
<br/><br/>
'''Differences from MY18 to MY20''' (Incomplete List) <br/>
The MY20 hardware in general depopulates the UEGO1, except for the 1751-6857.
* All hardware rated for PROD with runtime calibration capability
* All hardware uses MPC5644A micro
* The microprocessor speed is increased to 148 MHz
* Most hardware gains analog inputs AN34 through AN37
* There are more variants than listed above.  Some depopulate the CAN termination resistors.  Other variants only adjust the analog pull values.
<br/>

'''The Minimum MotoHawk version for the MY20 hardware is 2021aSP2 '''
<br/><br/>

== Related Part Numbers ==
{| class="wikitable"
|-
! Part Number <br> x = Inactive !! Description
|-
| 8923-1930 || Connector Kit
|-
| 8996-2228<br/>8996-2230|| Crimp Tools
|- 
|  colspan="2" | &emsp;&emsp;&emsp;<b>Removal Tools</b>
|-
| 8996-1059 || 0.63 MM Pin 1 Pole Extractor <!-- Molex part number 0011030003 -->
|-
| 8996-2161 || 1.5&nbsp;&nbsp; MM Pin 2 Pole Extractor <!-- Molex part number 63813-2300 -->
|-
| 8996-2160 <b>x</b>|| 0.63 MM Pin 2 Pole Extractor <!-- Molex part number 63813-2400 -->
|- 
| colspan="2" style="height: 7px;"|
|-
| 1635-1800 || Boot Key
|-
| 5404-1334 || Pig Tail (12 feet )
|-
| 5404-1322 || Pig Tail (3 feet)
|-
| 5404-1357 || Development Harness
|-
| 5404-1335 || Programming Harness
|-
| 8923-1404 || Breakout Box
|-
| 5404-1321 || Desktop Simulator Harness
|}

== Targets ==
The SECM-112 has different Targets for the MAIN Prod and Dev modules as shown in the [[SECM112#Part_Numbers| Part Numbers]] section.  The S12G auxillary processor also has it's own target.  

'''Auxillary Processor''':  Target [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-S12G-112-059-1200.html ECM-S12G-112-059-1200]  PROD Only
<br/><br/>

== Control Features ==

Standard features common to all models are:
*2 engine speed inputs: camshaft and crankshaft speed (software configurable for variable reluctance (VR) magnetic pickup sensor or Hall effect proximity sensor inputs)
* Up to 6 frequency inputs (some share analog resources)
* Up to 33 analog inputs
* 3 switch inputs
* 2 HEGO sensor inputs
* 2 LSU sensor inputs (also known as UEGO sensors)
* 2 knock sensor inputs
* 3 transducer power outputs providing +5V (350mA & 100mA) and +12V (100mA)
* Up to 3 H-bridge driver outputs providing 10A and 5A drive capability and current sense feedback
* Up to 6 Injector drivers providing software configurable peak and hold current levels (up to 7A/2A)
* 6 ignition coil drivers
* MPRD (Master Power Relay Driver) low side output
* TACH low side output
* 16 low side output drivers (1 with current sense feedback)
* 3 CAN (Controller Area Network) communications ports
* 32K-byte serial EEPROM for tunable parameter storage
* Auxiliary micro with 128k of flash, 8k of RAM, 4k of EEPROM

<br/>

=== Inputs ===
==== Analog Inputs (AN1 – AN34)====
There are 34 analog inputs on the SECM112. The analog inputs have either a pull-up resistor as shown in Figure 2-12, or a pull-down resistor as shown in
Figure 2-13. Five analog inputs have a software pull-up or pull-down selection via calibration. AN21 & AN30 share a common control line for the 1k or 11k selection, designed for EGT sensor diagnostics. All the analog inputs have a single-pole filter with a 1 ms time constant, except for Analog Input 5, which is reserved for a MAP (Manifold Absolute Pressure) sensor and has a 0.24 ms time constant.

The Analog Inputs are [[12-bit_ADC|12-Bit ADC]]

'''AN20'''

AN20 has a different pullup resistor depending on the hardware.  Modules labelled with '''VPCWGF-12A650-BJ''' and older had a 60.4 KOhm pullup installed.  Modules labelled with '''VPCWGF-12A650-BL''' and newer have a 1 KOhm pullup installed.  The pull device is software selectable between the pullup value listed here and the 51.1 KOhm pulldown resistor.


===== Fast Analog Channels =====
ANx_FAST channels are sampled faster than the equivalent ANx. This is needed on SECM112 because of how ADC bandwidth is consumed. SECM112 utilizes most of the available ADC bandwidth to service the reaction channel’s load current sampling. This means that the continuous scan queue sampling that is used by the other channels will take much longer than it normally takes on other modules. SECM112 FAST channel will be sampled every 90us where as normal channels will sample within 1ms (860us) worst case. The 1ms conversion time is problematic for threads of execution that execute at 1ms since the data is sometimes old and sometimes new. 

There is no need for such channels on the other ECUs because the ADC bandwidth is not being consumed like it is on the SECM112 and so all the channels are effectively sampled FAST.

==== Crank and CAM Inputs ====
The Cam and Crank (CNK) inputs are used to detect engine speed and angular position relative to TDC.   The SECM112 has CAM and Crank sensor inputs that can be connected to either a variable reluctance magnetic pick-up sensor (VR-MPU), or to a Hall-effect proximity switch. Each type of
input has dedicated connector pins.  See the SECM112 datasheet for additional detail.

==== Digital Inputs ====
The SECM112 has 8 Discrete Inputs.  Some may be used as switch inputs, others support frequency measurement.

==== Lambda Sensor Unit (UEGO) Inputs ====
The SECM112 control has two LSUs (Lambda Sensor Units), also known as UEGO (Universal Exhaust Gas Oxygen) inputs, which interface with Bosch LSU4.9 wide range oxygen sensors (Lambda sensors). The lambda-sensor(s) works in conjunction with the on-board Bosch CJ125 ASIC(s) to provide continuous regulation of  for a sensor in the range of  = 0.65... (air). The LSU inputs allow the ECM-OH to continuously regulate the engine air-to-fuel ratio, thus controlling the percentage of exhaust pollutants during the combustion process.

==== Knock Sensor Inputs ====
The SECM112 supports two Knock Sensor inputs.

Knock is implemented on the SECM112 in MotoHawk by the Knock by Decimation blockset.   This is a specialized blockset and is included with Standard MotoHawk in 2014a and higher.

=== Outputs ===
==== Low-side Outputs (LSO)====
The SECM112 control has 16 low-side outputs (LSOx & SPK8) that can be used as Boolean outputs for driving relays, or some as PWM outputs. LSO1 and LSO2
are also designed to drive the heater coil on a LSU sensor. Some low-side outputs are provided with freewheeling diodes (internal to the ECM-OH through
DRVP or BATT) to suppress the back EMF caused by inductive loads. See the ECM-OH datasheet for low-side output capabilities and characteristics.  The LSOs are clamped and can be used to drive relays.

==== Injector Outputs ====
The SECM112 control has 6 injector outputs, each capable of driving either low or high impedance injectors. Each injector output can be used as a Boolean output, a PWM output, or as a synchronous or periodic peak and hold injector output.

===== Reaction Module Blockset =====
The peak-hold current level is software configurable through the [[Reaction_Module_Blockset|MotoHawk Reaction Channel Blockset]].

Peak current cannot be run simultaneously on more than 3 injectors on the SECM112 control.

==== Spark Outputs ====
The SECM112 has 6 IGBT ignition coil drivers each capable of delivering up to 10A of peak dwell current.

The Spark Outputs can be globally disabled via the main core's discrete output DRVR_ENABLE resource. The behavior of these outputs can also be affected by the [[SECM112#Targets | Auxiliary Processor]] via its ability to disable the Master Power Relay (which will also disable the encoder's Crank and Cam inputs).

A special blockset has been created for control and diagnostics of the MC33810 chip which is the driver for the IGBT coil drivers on the SECM112.  See [[MC33810_Blocks|here]] for more detail on the blocks related to the MC33810.

==== H-bridge Outputs ====
The SECM112 control has two H-bridge outputs that can be used to drive electric motors like butterfly throttle valves.  The H-Bridge outputs are provided with freewheeling diodes (internal to the SECM112 through DRVP) to suppress the back EMF caused by inductive loads.
<br/><br/>
The '''H1+''' output can be chosen to be driven with half-bridge control.  Half-bridge control (also called push/pull control) means that the circuit actively drives the output high when ON and low when OFF.<br/><br/>
The '''HS_H1+''' output can be selected to operate the H1+ output as a standard high side drive.  A high side drive is one where the circuit drives the output high when ON, but then switches to high impedance when OFF.<br/><br/>
The H2 H-Bridge can operate both pins independently as high side outputs.  Therefore both '''HS_H2+''' and '''HS_H2-''' can be utilized as high side drives.<br/><br/>
The H-bridge Outputs can be disabled by the [[SECM112#Targets | Auxiliary Processor]].

The Third H-Bridge is only populated when INJ5 and INJ6 is not populated as both sets of functions use the pins as shown in this table
{| class="wikitable"
|-
! Function !! Pin
|-
| H3+ || C-G4
|-
| H3- || C-G1
|-
| INJ5 || C-G4
|-
| INJ6 || C-G1
|-
|}

==== MPRD Output ====
The MPRD Output is a common feature of almost all Woodward ECUs and is used to energize the Master Power Relay under application control.

The MPRD Output can be disabled by the [[SECM112#Targets | Auxiliary Processor]], which also has the side effect of disabling the encoder inputs (Crank and Cam).

<br/>

== Output Fault Detection ==
Output Fault Detection for the SECM112 is through the [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_lib_Blocks/IOFaultStatus.html IO Fault Status block] and the [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_lib_Blocks/FaultStatusGet.html IO Fault Status Get] block.  This block will report a "0" if the driver is not reporting a fault, a "1" if the driver is detecting a fault, or in some cases a "2" for indeterminate.  The faults that can be detected depend on the capability of the driver.  Outputs driven by the MC33810 driver have additional fault reporting capability that can be exposed through the [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_lib_Blocks/MC33810FaultDetail.html MC33810 Fault Detail Block].  This block reports the last fault reported by the MC33810 driver and so the report from this block does not clear when the fault state is removed.  The IO Fault Status block should be used to detect whether a fault condition is detected, and then the detail block can be used to detect which fault was reported.  The fault detection capabilities of the SECM112 outputs are described below:

=== H-Bridges ===
For the h-bridges, shorted load faults can be reported.  Shorted load reporting for each H-bridge is through overcurrent detection.  See the SECM Hardware Manual for minimum overcurrent threshold values.  Current Monitoring should be used in the application model for further diagnosis, such as for open load detection.

=== Injectors ===
SECM112’s injector drivers utilize the microprocessor’s Reaction Module for diagnosis. Reaction module diagnosis is based upon observing current and therefore INJ faults can only be detected when the INJ pins are asserted. Observed faults are cached until reported, where they are then cleared. Detection while not asserted is not possible. Therefore the fault status of an INJ output should only be queried once after an actuation event. Querying too often may result in no fault being reported even if the queried INJ output is currently in fault (e.g. open circuit). The [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_lib_Blocks/PHWOTReactionChannel.html PHWOT Reaction Channel] MotoHawk help provides further detail.

Currently only the IO Fault Status block allows the fault status of an INJ output to be queried.

=== Spark ===
The Spark outputs are driven by the IGBT drivers of the [http://www.google.com/url?url=http://www.freescale.com/webapp/sps/site/prod_summary.jsp%3Fcode%3DMC33810&rct=j&frm=1&q=&esrc=s&sa=U&ei=Uli1U7zYA5GcyASd_IH4BQ&ved=0CBQQFjAA&usg=AFQjCNGOgPiWwAV_dZ-bz4R4ETEkNGjTXQ MC33810 driver]. 

'''The spark output diagnostics assume the SPK outputs are driving an ignition coil as a load.'''  

Comprehensive fault diagnosis when used with ignition coils is described in the [http://www.google.com/url?url=http://www.freescale.com/webapp/sps/site/prod_summary.jsp%3Fcode%3DMC33810&rct=j&frm=1&q=&esrc=s&sa=U&ei=Uli1U7zYA5GcyASd_IH4BQ&ved=0CBQQFjAA&usg=AFQjCNGOgPiWwAV_dZ-bz4R4ETEkNGjTXQ MC33810 Datasheet].   The diagnostic approach is based upon analysis of multiplexed feedback signals that go to the MC33810 which require that the actuators don’t de-assert (i.e. spark) at the same time.  Overlap is possible with PWM and discrete, therefore, diagnosis is less capable or impossible when the SPK outputs are driven by PWM or Discrete output blocks. 

'''Note''' that SPK8 is different from the other SPK outputs in that it is a MOSFET.  SPK8 has short while asserted and open while not asserted detection and can be used with the MC33810 Fault Detail block. It is a GPGD type output and thus can use the MC33810 blocks related to GPGD configuration.  Unlike the other spark outputs, SPK8 diagnosis is fully functional when not being driven with an engine position synchronous behavior.

A special blockset has been created for control and diagnostics of the MC33810 chip which is the driver for the IGBT coil drivers on the SECM112.  See [[MC33810_Blocks|here]] for more detail on the blocks related to the MC33810.


=== LSOs ===
There are three types of drivers for the LSOs on the SECM112.  Each has slightly different fault reporting capability which is described below.
* '''LSO1-6''':  reports open circuit or short to ground while de-asserted and short when asserted. LSO6 has current sense as well. 


* '''LSO 7,8,9,11, 12, 13, 14, TACH:'''  These LSOs are driven by MC33810.  Faults of Open while Asserted, Open while De-asserted, and Short to Battery can be reported.  The IO Fault Status block reports the fault state, however there is also an MC33810 Fault Detail block that gives the last fault reported.   The IO Fault Status block should be used to indentify that there is a fault and then the MC33810 Fault Detail block can identify which fault was reported.  The open while asserted fault is detected through current monitoring.   Currents less than 200mA can cause an open while asserted fault to be reported.  Therefore, if the load current is expected to be under 200mA, the Open While Asserted diagnostic should be disabled via the Open Load While Asserted Configuration block.  A special blockset has been created for control and diagnostics of the MC33810 chip which is the driver for the IGBT coil drivers on the SECM112.  See [[MC33810_Blocks|here]] for more detail on the blocks related to the MC33810.


* '''LSO10''': reports open or short to GND while de-asserted, and short while asserted.  The IO Fault Status block will report a “2” if no fault is detected, or a “1” if a fault state is detected.  It will not report a "0" (OK).   There is a Fault Detail block that will also report which type of fault (Open or Short) has been detected.   Note that the Fault Detail block can still report indeterminate (2) in some cases, but can more clearly identify whether a particular fault is active. For example, while LSO10 is de-asserted the fault detail for LSO10 will report the open fault as being either OK (0) or in fault (1), but will sometimes intermittently report indeterminate(2). The short to battery would continuously report indeterminate (2) while off. 


* '''LSO15''':  reports open or short to GND while de-asserted, and short while asserted.   There is not a block to detect which fault is being set, but the state of the output (On or Off) could be used in the application model.  This will report “2” if no fault is detected, or a “1” if a fault state is detected. <br/> <br/>

=== Internal Temperature Monitor ===
The SECM112 has an internal temperature monitor that can be accessed via the '''Get Module Data''' block. So, for example, you could implement a Simulink model that logged the maximum observed MicroTemp to NVM. 

[[Image:GetModuleData_JunctionTemp.PNG]]

== Shared Resources between the Main and Auxillary S12 cores ==
The following are shared between the Main and S12G cores:

'''Analog inputs:'''
{| class="wikitable"
! Resource
! Note
|-
| AN01 to AN05
|
|-
| AN16 to AN18
|
|-
| AN24
|
|-
| AN31
|
|-
| VCAL
|
|-
| KEYSW
| Also known as ECUP
|}

'''Digital inputs:'''
{| class="wikitable"
! Resource 
! Note
|- 
| CNK
| VR1/DG1 (after VR/DG mux)
|- 
| DG3
|- 
| DG4
|- 
| DG5
|- 
| DG6
|- 
| DG8
|-
| MAIN_STAT
| main core status
|-
| N/A
| reset from main core*
|-
| N/A
| Wake-up (on XIRQ) from main core
|}

'''*''' There is a shared line for reset of the S12 by the main core, however, this is not available to the application.  There is no block to set it.   It is currently only used during programming to turn the S12 off to prevent CAN bus errors or erroneous resets<br/>

'''Comms:'''
{| class="wikitable"
! Resource 
! Note
|-
| CAN1
|
|}

'''Outputs:'''
{| class="wikitable"
! Resource 
! Note
|- 
| H1DIS
| H1 Disable
|- 
| H2H3DIS
| H2 and H3(If Populated) Disable
|- 
| MPRDDIS
| Main Power Relay Drive Disable, also disables VR1/DG1 and VR2/DG2 inputs 
|- 
| RESETMAIN
| Reset Main CPU core
|- 
| CVR_MODE
| CAM VR mode select. Can also be configured by main core via SPI
|- 
| CVT_PWM 
| CAM VR threshold PWM. Can also be configured by main core via SPI
|}

'''ADC Pullup Select:'''
{| class="wikitable"
! Resource 
! Note
|- 
| AN20
| Can also be configured by main core via SPI
|- 
| AN24
| Can also be configured by main core via SPI
|- 
| AN31
| Can also be configured by main core via SPI
|- 
| DG3
| Can also be configured by main core via SPI
|}

=== Communications ===
==== CAN ====
The SECM112 has three 2.0B CAN ports for distributed I/O, distributed control, and Human Machine Interface (HMI) purposes.

 Important: The SECM112 is programmed at the factory with a sample application that sets CAN-1 of both the Main and Auxillary Cores to 500k baud rate.   
 '''Both Cores are internally connected within the ECU on CAN-1'''.
 '''If the baud rate of one of the cores is changed on CAN-1, then the baud rate of the other core must be programmed also to match on CAN-1.'''
 '''Each Core must also have a Unique City ID for MotoTune defined in the MotoTune Protocol Definition Block'''

For programming the SECM112, it may help to think of it as two modules connected on CAN-1 -  the main and the aux S12G.  Since the cores are internally connected on CAN-1,  the baud rate must be the same for both on CAN-1, and they must have different City-ID’s. The module ships pre-programmed with an application ([http://mcs.woodward.com/content/motohawk/examples/ECMOH_sampleapp.zip the S12G application "OH_S12G_sampleapp_047.srz" is included in this ZIP]) that sets the Baud rate for both cores to 500k, with City ID of main – 0xB and the City ID of the aux 0x81.    

The hardboot (settings used to program the module by boot key or boot harness) if it needs to be recovered are: 
Main: 250k b/s  City ID 0xB
Aux: 250k b/s City ID 0x81

To change the baud rate on CAN-1, first program the main core.  Cycle power to put auxiliary in hardboot, the program the auxiliary as above.


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=== [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1204.html MotoHawk Target Cross Reference] ===
The [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_topics/_auto/ECM-5644A-112-048-1204.html MotoHawk Target Cross Reference] shows which IO on the ECM-OH hardware is supported by which behavior (blocks).  There are charts showing behavior vs pin as well as pin vs behavior.  This is the software help document for the module.

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== [[Reaction_Module_Blockset|The Reaction Module Blockset]] and the SECM112==
The standard PSP blocks (Injector Sequence, Dual PSP, Multiple PSP..) are supported on the SECM112, but configuration of the Reaction Module '''is Required''' for Injection on the SECM112. 

Peak-Hold timing is configured by the Reaction Module, '''and the peak-hold input port on the sequence blocks is ignored.'''

See the article on the [[Reaction_Module_Blockset|Reaction Module Blockset]] for additional details.

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== MC33810 Spark Blockset and the SECM112 ==
Many of the Woodward MCS ECMs have EST outputs which provide 0-5V TTL level outputs for smart coils.  The SECM112 spark outputs are IGBT coil drivers for driving a coil directly. These outputs use the MC33810 driver, which is configured through the MC33810 Configuration blocks, located in MotoHawk Module Configuration blocks.

See the article on the [[MC33810_Blocks|'''MC33810 Configuration blocks''']] for more detail.

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== Calibration Memory ==

<big>'''The SECM112 has 64k of Calibration memory available.'''</big>

If you are porting an application from another ECU (ex. the 128-pin) the SECM-112 may have less calibration memory available.  There is a second 64k of Calibration Flash that can be used to shadow this data so that in the event of a power loss during calibration a copy of the calibration data is stored (from the last write).   This redundant calibration is enabled with a special blockset.    However, the SECM112 has 64k of Calibration Flash memory, regardless of whether redundant calibration is enabled or not.   The second 64k cannot be used to store additional calibrations.   This was a design descision based on the total memory of the DEV module.   For the DEV module, calibration data is shadowed from flash into RAM at startup to allow on-line calibration.   The SECM112 has limited RAM as compared to some of the other ECUs with external RAM.   If additional calibration flash was allocated, the same amount of RAM would need to be reserved and would not be available to the application.  For the Flash module, the calibration data is read directly from Flash and is not shadowed into RAM.

The SECM112 also has 32k of NV memory storage in serial EEPROM.  The NV data (for both DEV or PROD) is shadowed in RAM at startup, and is stored in the serial EEPROM at shutdown through execution of the store NV block.  Some calibration values may be able to be moved to NV storage  (ex. Calibration NV).

Recommendations to reduce calibration memory in the application:

1. '''Review and Optimize Datatypes'''. The first thing to look at in reducing calibration memory is 64 bit vs 32 bit.  Double is the Simulink default, but is often larger than required.   Convert calibratons to 32-bit (single) or smaller datatypes.
  
2. '''Review and Optimize Tables'''. The next big item is table optimizations.  It is likely that 32-bit floating point is not needed for every table and can be reduced.  Reducing the dimenstions of tables would also reduce the memory usage.

== The Main Power Relay Block and the S12G Auxillary processor ==
A common question is whether the MotoHawk MPRD block should be placed in the application for the S12G auxillary processor or not.  And, if so does it need to be modified.  The MPRD block is optional and does not need to be placed in the application.  

Also, the MPRD block is intended as a starting point and is intended to be modified to suite specific application shutdown requirements (right click the block and select Look Under Mask).

An application may choose to have the MPRD block, or some shutdown logic, in the model for the S12G in order for the S12G to go to sleep to reduce current draw or to get the Key Off timer.   The S12 will go to sleep when the shutdown power block is executed.  When woken up by the main core, it will continue executed from where it left off.  If using the standard MPRD block with the auxillary S12G, it is nessessary to remove the MPRD discrete output from the block.   The below link has an example MPRD block modified for the ECM-OH Auxillary processor.

[http://mcs.woodward.com/content/motohawk/examples/ECM_OH_S12G_sampleapp.mdl ECM-OH Example of Modified MPRD for the S12G]

== Recovering the SECM112==
Occasionally, errors in programming may require that the module be recovered with a boot key or boot sequence. The following section describes recovery procedure for the SECM112.  For general information for all modules, see [[Boot_key_recovery|Boot Key Recovery]].<br><br>

<big>'''Important: Remove the ECU from all control connections before attempting to recover the module.'''</big><br><br>

'''Default Bootloader MotoServer Settings (Recover/Bootstrap Mode):'''

Main Core: 250kbps on CAN-1, City ID 0x0B (11)<br>
S12G Core: 250kbps on CAN-1, City ID 0x81 (129)

The SECM112 has two microprocessor cores, the Main Core and the Auxillary S12G. Both processors are connected on CAN1, so it is important that both processors configure their CAN-1 port with the same baud rate, and different MotoTune IDs.<br><br>

'''Recovering the Main Processor'''<br>
The main processor can be recovered with a boot key on pin DG8.  The boot key provides a 555Hz, 0-Vbatt, 50% duty cycle square wave on the STOP pin (pin E) of the 10-pin hub.  This signal can then be wired to DG8. Alternatively,  the main processor can be recovered with the following sequence on the analog inputs:<br>
AN3: Pull to +5V <br>
AN4: Pull to +5V <br>
AN16: Pull to GND <br>
AN17: Pull to GND <br>
AN18: Pull to +5V <br>


'''Recovering the S12G Auxillary Core (requires battery toggle)'''<br>
The S12G cannot be recovered with a boot key.  A boot sequence on the analog inputs of the S12G is required to recover it.<br>
AN3: Pull to +5V <br>
AN4: Pull to +5V <br>
AN16: Pull to +5V <br> 
AN17: Pull to GND <br>


'''Applying the boot signal or sequence'''

The boot key signal or boot sequence is only searched within the first 2-3 seconds of the ECU waking up.   To ensure that the signal/sequence is recognized, the following procedure is recommended:<br>
1) Apply the boot signal or sequence. <br>
2) Main Core recovery: Turn Power ON, but key off; S12G Core recovery: battery off.<br>
3) Initiate MotoTune programming on the MotoServer port (City ID 0x0B 250k baud for Main Core, 0x081 250kbaud for S12G Core). <br>
4) When 'Searching for ECU' appears in MotoTune, turn the key on (Main Core recovery) or battery on (S12G Core recovery).    It may take several tries.<br>
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'''Avoiding Baud Rate Collision During and After Recovery Process:'''

The Pre-PV and PV units will ship with a Main Core sample application that will connect at 500 kbps on PCM-1 (City-ID 11) or PCM-2 (City-ID 12), and S12G Core sample application that will connect at 500 kbps on SECM-1 (City-ID 129).  The application baud rate on CAN-1 does not match that of the bootloaders’ recovery mode baud rate, and there may be baud rate collision between the Main Core Application and the S12G Bootloader (or between the S12G Application and the Main Core Bootloader).

The Main Core recovery process automatically avoids baud rate collision by holding the S12G Core in reset, so there will be no collision between the Main Core Bootloader and the S12G Core application.

However, if you are recovering the S12G Core, you must manually prevent baud rate collision by first programming the Main Core with an application* that sets CAN-1 at 250kbps.  Note that if after recovery the S12G application configures CAN-1 at other than 250kbs, it will collide with the Main Core application’s 250K CAN-1 setting.  Because of this, it is recommended to enable MotoTune on CAN2 in the Main Core application* to allow the Main Core to be re-programmed via CAN-2 (another option is to perform recover procedure on the Main Core after the S12G Core has been recovered).

== FAQ ==
=== Why Do I get this Build Warning?WARNING: CamEncoder has interface Hardware that has not been defined.===
There are new blocks in the MotoHawk Module Configuration library to set the Vr or Dg interface.  The settings in the Encoder Definition block are ignored.  You must use these blocks in the model.
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=== What causes the build to fail with this error? "ERROR: A ReactPHWOTChan definition for INJ1 was not found in the application. " ===
If the application is using the Injector blocks, the module's Reaction Channel must be defined and configured using the Reaction Channel Blockset.  This blockset is used to configure the peak/hold current levels (see above).
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=== What causes the build to fail with this error? "ERROR: A ReactionModule with a ModuleResource of REACT was not found in the application descriptor" ===
This is really the same cause as the question above.  The use of the INJ channels (even when not in an injector block) require the Reaction Module to be configured in the application.
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=== I see values with 100% in the build log.  Is this expected?  ===
There are several memory areas displayed in the build statistics that are internally reserved peices of data.  These are displayed at 100% in the build statistics and cannot be changed by the application.<br/>
FLASH_RCHW: 4 bytes 100% of 4 <br/>
FLASH_ENTRY: 4 bytes 100% of 4 <br/>
FLASH_CRCDEFNPTR: 4 bytes 100% of 4 <br/>
RAM_BOOTMAILBOX: 16 bytes 100% of 16 <br/>
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=== Is the 12 V power supply isolated?  ===
12VOUT is supplied from DRVP and shares a common ground plane so no there is no galvanic isolation from the other supplies.  The intent of the 12VOUT is to power a MAF sensor that requires this voltage. 
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=== Is the XDRP2 5 V supply more precise than XDRP1?  ===
XDRP1 is stated as "5V +/- 2%"<br/>
XDRP2 is stated as "VCC +/- 0.2%"<br/>
The above statements make it appear XDRP2 may be more precise than XDRP1, but this may be misleading.  VCC is the internal 5V supply, which is 5V +/-2%.  The reason XDRP2 is a better option for ratiometric sensors lies in the fact that XDRP2 is also the processor's ADC reference.  See next question on VCAL.

=== What is VCAL?  ===
VCAL is an internal precision 2.5V reference that can be read by the application using a MotoHawk Analog Input block.  This can be used to measure VCC and subsequently used to compensate for absolute voltage sensors.

=== What is DG8?  ===
DG8 may be called out in some SECM112 documentation, but this is the same as the STOP input.  MotoHawk specifically uses STOP as the resource for this module pin.

=== Can the Auxiliary Processor force an engine to stop?===
The [[SECM112#Targets | Auxiliary Processor]] can cause the H-Bridge Outputs to be in the off state via the H1 and H2 disables.  MPRD disable can also occur via the MPRD disable output, which also has the side effect of disabling the encoder inputs (Crank and Cam).  Ultimately, a corrective action can be taken by actively resetting the main processor.
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=== What is the maximum pulse length that can be delivered for SECM112 when using 'Unsynchronized PSP OneShot Trigger'? === 
The 'Unsynchronized PSP OneShot Trigger' total duration input port is specified with uint32 data type, but the hardware has a maximum achievable duration of 839 ms.
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=== What is the maximum pulse length that can be delivered for SECM112 when using the 'One Shot Definition' Block? === 
The [http://mcs.woodward.com/content/motohawk/Documentation/CurrentVersion/HTML/MotoHawk_lib_Blocks/OneShotOutput.html One Shot Definition] block's duration input port is specified with int32 data type, but the hardware has a maximum achievable duration of 105 seconds.
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=== What is the maximum length of time that quantities of SECM112 units can remain in storage prior to usage in my product? === 
The units can be stored indefinitely, but the best practice is to apply power them every 18 months or so (no longer than that is recommended).  This is to keep the capacitors in good working condition and to prevent overheating when the hardware is installed and used for production. 
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=== Out of allocaton space in segment RAM_BLOCK0_SEG when building S12G models ===
An [[S12 Out of allocation space in segment RAM_BLOCK0_SEG]] error is sometimes seen during the linking step when building an S12G model. Follow the link for some tips.

=== Is there an Intrusion Protection rating for SECM112? ===
The Woodward Hardware Manual for SECM112 indicates that the SAE J1455 standard is met, where J1455 is the recommended practice that encompasses the range of environments which influence the performance and reliability of the electronic equipment designed for heavy duty on and off road vehicles.  Examination of the SAE J1455 standard indicates that the SECM112 should be equivalent to the '''IP 67''' rating.