Hi,
There was a bug confused me recently. In my project, When battery connected my board, the BQ25120A would be configed first. The steps as follow:
step 1, Initial the board.
step 2, config the BQ25120A POWER PIN as output, and set it high, delay 2ms, initial I2C driver.
step 3, config the BQ25120A CD PIN as output, and set it high( now is no charging), delay 1ms.
step 4, I2C write SYS_VOUT_CTRL_REG (0x06) to set BQ25120A output 2.8V. I think this maybe no issues on I2C, but the I2C operation failed. However, it will be OK that I2C write the same operations again. Why?
This was my scope picture about the I2C lines:
picture 1, the first I2C write, which showed when writed 0x6A address, but no BQ2510A ACK, so MCU stoped it. (green line is SDA, yellow line is SCLK)
picture 2, the second I2C write after the I2C write error abow, which configed OK, and the system vol is 2.8V. (green line is SDA, yellow line is SCLK)
