LP5036: LP5036 I2C NACK

Hardy Xue

Part Number: LP5036

Hi Team,

We have a problem on LP5036 I2C communication. The LP5036 will occur NACK when after re-power on. As I know, the device will reset when EN from low to high. But why EC cannot write register of LP5036?

The EC command is as below.

1. 0x38[7-0]: FFh

2. 0x00: Chip_EN = 1

3. 0x02: FFh

Best regards,

Hardy

over 3 years ago

0 Monet Xu over 3 years ago

TI__Expert 6675 points

Hi Hardy,

Could please help to solve my confusion firstly?

Do you means that the following steps couldn't operate successfully after repower on the LP5036?

write FFh to address 0x38
write 1 to chip_en bit on address 0x00
write FFh to address 0x02

if it is right, could you please provide the write commend and read commend waveform?

Best Regard

Monet Xu

0 Hardy Xue over 3 years ago in reply to Monet Xu

TI__Expert 3590 points

Hi Monet,

Yes, your description is right. I will ask for customer to provide the write commend and read commend waveform. By the way, do we have sample code that can be provided to customers for reference?

write FFh to address 0x38
write 1 to chip_en bit on address 0x00
write FFh to address 0x02

Best regards,

Hardy

0 Monet Xu over 3 years ago in reply to Hardy Xue

TI__Expert 6675 points

Hi Hardy,

Please suggest customer that send the address of chip first after repower on. in addition waiting for your waveform.

Could you please check with customer which MCU and Compilation platform do they use?

Best Regard

Monet Xu

0 Hardy Xue over 3 years ago in reply to Monet Xu

TI__Expert 3590 points

Hi Monet,

They send data to 0x1C address of chip.

Best regards,

Hardy

0 Frank Qiu over 3 years ago in reply to Hardy Xue

TI__Genius 15776 points

If there is no further question, we will close this thread.

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LP5036: LP5036 I2C NACK