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BQ25756: BQ25756 I2C control guide and behavior in detail
Can you explain more about "control discharge function"? The BQ25756 discharges when in (1) battery only, automatically or (2) reverse/OTG mode, after I2C write to enter reverse mode.
I assume you want to know how to enter reverse mode to use the battery to provide a regulated voltage back to the charger input. If so, from datasheet section 8.3.6 Reverse Mode Power Direction:
The reverse mode operation can be enabled if the following conditions are valid:
1. SRN pin (battery voltage) above 3 V
2. DRV_SUP voltage within valid operating window (VDRV_UVP < VDRV < VDRV_OVP).
3. Voltage at TS (thermistor) pin is within range configured by Reverse Temperature Monitor as configured by BHOT and BCOLD register bits in REG0x1D
I recommend the following I2C writes:
1. Set the reverse mode input voltage regulation point, VAC_REC, in REG0x0C-0D
2. Set the reverse mode output current regulation (clamp) point, IAC_REV, in REG0xA-0B if sense resistor is installed (optional)
3. Set the battery discharge current regulation (clamp) point, IBAT_REV, in REG0x62
4. Disable charge using EN_CHG bit in REG0x17(0)
5. Enable reverse mode using EN_REV in REG0x19(0).
