BQ25700A Datasheet, PDF (34/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25700A
SLUSCQ8 – MAY 2017
www.ti.com
Table 7. ChargeOption0 Register (SMBus address = 12h) Field Descriptions (continued)
SMBus
BIT
9
8
FIELD
TYPE RESET DESCRIPTION
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.
0b: 1200 kHz
1b: 800 kHz <default at POR>
Reserved
R/W
0b
Reserved
Table 8. ChargeOption0 Register (SMBus address = 12h) Field Descriptions
SMBus
BIT
7-6
5
FIELD
Reserved
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 (REG0x3E()), 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
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