BQ76952: REG1,REG2

您好，过度驱动请参考下面介绍：

You will most likely use the REG1 LDO output to pull-up the i2c communication lines through pull-up resistors, so they will build a PCB that pulls the i2c lines up to REG1.  The issue with this, though, is that some devices are not configured with REG1 ON by default, but in order to communicate with the BQ76952 through i2c, the lines must be pulled up to a higher voltage.

So to communicate with the BQ76952, the customer needs to enable the REG1 LDO, but the customer cannot change the REG1 LDO configuration without having a pull-up voltage present on the i2c lines, which is provided by REG1.  This is a tricky situation, and it is why we recommend overdriving.

What this entails is having an external voltage source connect to where the REG1 pin is pulling up the i2c lines and provide the voltage needed for the MCU to communicate with the BQ76952 and enable the REG1 LDO through programming it into OTP.  Once REG1 is enabled in OTP, the external voltage source is not needed.