TPS929120-Q1: TPS929120-Q1

I'm in the process of integrating my code used to communicate between the TPS929120 and my microcontroller.

I've been able to verify that I am transmitting the message 0x55 0x80 0x20 0x3F 0x71 (last byte is CRC-8) from the microcontroller to the TPS929120.

However, the TPS929120 never seems to send a response back on its TX pin.

The data sheet says the device will not response if the CRC is incorrect, but I believe the CRC I am sending is correct according to the calculation spreadsheet and source code you have provided.

I have my microcontroller UART TX and RX lines directly connected to the TPS929120 RX and TX pins respectively.

UART configuration is baud rate 1MHz, 1 start bit, 8 data bits, 1 stop bit, no parity.

Is there another reason the TPS929120 would not respond to my message besides an incorrect CRC?

Thanks.

It turns out that the device address was the problem.

I'm using the hardware pin method of addressing and have the ADDR[2:0] pins all pulled low.

According to the data sheet, the default values of EEP_INTADDR and EEP_DEVADDR should both be 0,

giving a default address configuration using the hardware pins with the high bit of EEP_DEVADDR set to 0 (i.e. address 0).

However, what I found is that the high bit of EEP_DEVADDR in my devices is defaulted to 1 (i.e. address 0).

Is the data sheet correct, or is EEP_DEVADDR[3] supposed to default to 1 instead of 0?

Thanks.