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Hi
The first instruction sent through IIC after power-on returns NACK, and subsequent instructions are normal.
The normal timing is that after the host sends 0X3E, 76952 replies with ACK, as follows:
The error is as follows:
The error occurs when the command is sent for the first time after power-on. After the error is restored, the command sent after the bus is restored is normal.
The query is why the command for the first time after power-on is wrong. No matter how long I delay sending the command, the first command All errors will occur.
Thanks
Star
Hi Max
Thanks for your reply.
The first command enters configmode and returns NACK.
Send the same command after 500ms and reply normally.
After power on, send a command to read the device name and reply NACK.
Send the same command after 500ms and reply normally.
Thanks
Star
Hi Star,
I found this thread that details a similar issue: BQ76952: I2C Communication errors / Communication error received over time - Power management forum - Power management - TI E2E support forums.
You may try following the advice given in that thread and see if any of it works.
You may also try sending a direct command such as the Cell 1 Voltage command (see below for the example from the SDG) to see if the device responds differently.
Regards,
Max Verboncoeur
