L9026 Device Configuration Sequence

[krishnapalepu]

Will be looking for a simple sequence to activate the Outputs of the L9026

Note:- INT0 and INT1 are used to activate the chip

Quick Response will be greatly appreciated.

Thanks,

Krishna

[Jacob WOODRUFF]

Hi All,

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.

Regards,
Jake

ST Support

[JerryK]

Jacob,

Is there any chance that you can post the sequence for getting the L9026 up and running.  I see that you set the PWM to active, then set the Duty Cycle to 100%.  But there is very little info on the config registers.  Does it boil down to enabling the channel (0-7), setting the PWM frequency, setting the Duty Cycle to 100%, then setting PWM_SPI to correlate to the channel I want to drive?

Help is appreciated.

Jerry

[Elena BRAMBILLA]

The sequence of SPI messages to be sent to the device to switch on the channels is the following one:

Start-up phase:

1. Power-up system
2. IN0 = 0, IN1 = 0, IDLE = 0. Device is in Sleep Mode
3. IN0 = 0, IN1 = 0, IDLE = 1. Device is in Idle Mode
4. SPI initial configuration:

− CFG_0: 0X8420 (Configure CH3 as HS, all other outputs are in default state

LS, Frame counter = 0))

− MAP_IN0: 0x9C05 (Associate IN0 to CH0, Frame counter = 1)

− MAP_IN1: 0xA080 (Associate IN1 to CH5, Frame counter = 0)

− CFG_1: 0x8803 (LED PWM generator freq = 122.5Hz, Frame counter = 1)

− CFG_2: 0x8C00 (GEN PWM generator freq = 122.5Hz, no adjustment,

Frame counter = 0)

− PWM_LED_DC: 0xB001 (PWM LED duty cycle = 0%, Frame counter = 1)

− PWM_GEN_DC: 0xAC02 (PWM GEN duty cycle = 0%, Frame counter = 0)

− MAP_PWM: 0xA431 (CH2-CH3 driven by internal PWM generators, Frame

counter = 1)

− PWM_SEL: 0xA812 (CH2 driven by PWM LED & CH3 driven by PWM GEN,

Frame counter = 0)

− BIM: 0x9041 (Activate Bulb inrush mode on CH4, Frame counter = 1)

− CFG_1: 0x8900 (put device in Active mode, Frame counter = 0)

5. Switch ON the loads

− IN0 =1, IN1 = 1 (switch ON CH0 & CH5)

− PWM_SPI: 0x9B49 (all SPI driven channels are switched ON, Frame

counter = 1)

− PWM_GEN_DC: 0xAFFE (configure PWM GEN duty cycle at 100 %, the

expected effect is CH3 fully ON, Frame counter = 0)

− PWM_LED_DC: 0XB3FD (configure PWM LED duty cycle at 100 %, the

expected effect is CH2 fully ON, Frame counter = 1)