BQ25120_15 Datasheet, PDF (37/68 Pages) Texas Instruments – bq25120 700-nA Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT

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BQ25120
SLUSBZ9A – AUGUST 2015 – REVISED AUGUST 2015
9.6.4 Fast Charge Control Register
Memory location 0x03h, Reset State: 0001 0100 (bq25120), 0000 1100 (SN2500)
Figure 25. Fast Charge Control Register
7 (MSB)
6
5
4
3
2
1
0 (LSB)
0
0
0
1
0
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 14. Fast Charge Control Register
Bit Field
Type
Reset
Description
B7 (MSB) ICHRG_RANGE
R/W
0
0 – to select charge range from 5 mA to 35 mA, ICHRG bits are
1-mA steps
1 – to select charge range from 40 mA to 300 mA, ICHRG bits
are 10-mA steps
B6
ICHRG_4
R/W
0
Charge current 16 mA or 160 mA
B5
ICHRG_3
R/W
0
Charge current 8 mA or 80 mA
B4
ICHRG_2
R/W
1
Charge current 4 mA or 40 mA
B3
ICHRG_1
R/W
0
Charge current 2 mA or 20 mA
B2
ICHRG_0
R/W
1
Charge current 1 mA or 10 mA
B1
CE
R/W
0
0 – Charger enabled
1 – Charger is disabled
B0 (LSB) HZ_MODE
R/W
0
0 – Not high impedance mode
1 – High impedance mode
ICHRG_RANGE and ICHRG bits are used to set the charge current. The I_CHRG is calculated using the following equation: If
ICHRG_RANGE is 0, then I_CHRG = 5 mA + I_CHRGCODE x 1 mA. If ICHRG_RANGE is 1, then I_CHRG = 40 mA + I_CHRGCODE x 10 mA. If a
value greater than 35 mA (ICHRG_RANGE = 0) or 300 mA (ICHRG_RANGE = 1) is written, the setting goes to 35 mA or 300 mA
respectively except if the ICHRG bits are all 1 (that is, 11111), then the externally programmed value is used. The default is programmed by
OTP. The default is programmed by the external resistor on ISET, or if not populated and tied to GND, by OTP.
Copyright © 2015, Texas Instruments Incorporated
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