MotoHawk PCA9745B Group Set

The PCA9745B is a device that can drive up to 16 individual LEDs with constant current. There are four selectable gradation control groups and each group has independently adjustable control ramp-up and ramp-down rate, step time, hold ON/OFF time and final hold ON output current.

Refer to the PCA9745B device datasheet for detailed explanation of parameters.

Block ID

PCA9745B Group Set

Library

motohawk_PCA9745B_lib

Description

Block Inputs

Input Name	Values	Comments/Description
Ramp Rate Per Step	uint8 [0-63]	RAMP_RATE_GRPx, Total number of ramp steps is defined as ‘IREF_GRPx’ / ‘ramp_rate’. (Round up to next integer if it is not an integer number.)
Step Time Multiple	uint8 [0-63]	STEP_TIME_GRPx, Step time = cycle time (0.5 ms or 8 ms) * multiple factor (1 ~ 64); minimum step time is 0.5 ms and maximum step time is 512 ms
Hold On Time	uint8 [0-7], enum	HOLD_TIME_GRPx, one of the members of motohawk_PCA9745B_group_hold_enum
Hold Off Time	uint8 [0-7], enum	HOLD_TIME_GRPx, one of the members of motohawk_PCA9745B_group_hold_enum
Final Current Gain	uint8 [0-255]	IREF_GRPx, the current to be applied to all LEDs in the group
Ramp Up Enable	bool	RAMP_RATE_GRPx, enables ramp up
Ramp Down Enable	bool	RAMP_RATE_GRPx, enables ramp down
Hold-On Enable	bool	HOLD_TIME_GRPx, enables hold on time
Hold-Off Enable	bool	HOLD_TIME_GRPx, enables hold off time
8 ms Cycle Time Enable	bool	STEP_TIME_GRPx, chooses cycle time of 8 ms when true or 0.5ms otherwise
Gradation Start	bool	GRAD_CNTL, starts the blink or ramp pattern
Gradation Continuous Operation Enable	bool	GRAD_CNTL, selects continuous operation when true or one-shot otherwise

Block Parameters

Parameter Field	Values	Comments/Description
Reference Name	Alpha-numeric text, single quote enclosed	Name references PCA9745B Group Definition block.