BQ25703A Datasheet, PDF (35/81 Pages) Texas Instruments – I2C Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

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bq25703A
SLUSCU1 – MAY 2017
Table 5. ChargeOption0 Register (I2C address = 01h) Field Descriptions (continued)
I2C
01h
FIELD
TYPE RESET DESCRIPTION
1 PWM_FREQ
R/W
1b
Switching Frequency
Two converter switching frequencies. One for small inductor and the other for
big inductor.
Recommend 800 kHz with 2.2 µH or 3.3 µH, and 1.2 MHz with 1 µH or 1.5 µH.
Host has to set the right PWM frequency after device POR.
0b: 1200 kHz
1b: 800 kHz
0 Reserved
R/W
0b
Reserved
Table 6. ChargeOption0 Register (I2C address = 00h) Field Descriptions
I2C
00h
FIELD
7-6 Reserved
5 EN_LEARN
4 IADPT_GAIN
3 IBAT_GAIN
2 EN_LDO
1 EN_IDPM
0 CHRG_INHIBIT
TYPE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RESET
00b
0b
0b
1b
1b
1b
0b
DESCRIPTION
Reserved
LEARN function allows the battery to discharge while the adapter is present. It
calibrates the battery gas gauge over a complete discharge/charge cycle. When
the battery voltage is below battery depletion threshold, the system switches
back to adapter input by the host. When CELL_BATPRESZ pin is LOW, the
device exits LEARN mode and this bit is set back to 0.
0b: Disable LEARN Mode <default at POR>
1b: Enable LEARN Mode
IADPT Amplifier Ratio
The ratio of voltage on IADPT and voltage across ACP and ACN.
0b: 20× <default at POR>
1b: 40×
IBAT Amplifier Ratio
0b: 8×
1b: 16× <default at POR>
LDO Mode Enable
When battery voltage is below minimum system voltage (REG0x0D/0C()), the
charger is in pre-charge with LDO mode enabled.
0b: Disable LDO mode, BATFET fully ON. Precharge current is set by battery
pack LDO. The system is regulated by the MaxChargeVoltage register.
1b: Enable LDO mode, Precharge current is set by the ChargeCurrent register
and clamped below 384 mA (2 cell – 4 cell) or 2A (1 cell). The system is
regulated by the MinSystemVoltage register. <default at POR>
IDPM Enable
Host writes this bit to enable IDPM regulation loop. When the IDPM is disabled
by the charger (refer to IDPM_AUTO_DISABLE), this bit goes LOW.
0b: IDPM disabled
1b: IDPM enabled <default at POR>
Charge Inhibit
When this bit is 0, battery charging will start with valid values in the
MaxChargeVoltage register and the ChargeCurrent register.
0b: Enable Charge <default at POR>
1b: Inhibit Charge
Copyright © 2017, Texas Instruments Incorporated
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