BQ25120A Datasheet, PDF (40/67 Pages) Texas Instruments – Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT

bq25120A
SLUSD08 – MAY 2017
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9.6.5 Termination/Pre-Charge and I²C Address Register
Memory location 0x04h, Reset State: 0000 1110 (bq25120A)
Figure 29. Termination/Pre-Charge and I²C Address Register
7 (MSB)
6
5
4
3
2
1
0
0
0
0
1
1
1
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 16. Termination/Pre-Charge and I²C Address Register
0 (LSB)
0
R/W
Bit Field
Type
Reset
Description
B7 (MSB) IPRETERM_RANGE
R/W
0
0 – to select termination range from 500 µA to 5 mA,
IPRETERM bits are 500-µA steps
1 – to select charge range from 6 mA to 37 mA, IPRETERM bits
are 1-mA steps
B6
IPRETERM_4
R/W
0
Termination current 8 mA or 16 mA
B5
IPRETERM_3
R/W
0
Termination current 4 mA or 8 mA
B4
IPRETERM_2
R/W
0
Termination current 2 mA or 4 mA
B3
IPRETERM_1
R/W
1
Termination current 1 mA or 2 mA
B2
IPRETERM_0
R/W
1
Termination current 500 µA or 1 mA
B1
TE
R/W
1
0 – Disable charge current termination
1 – Enable charge current termination
B0 (LSB)
R/W
0
IPRETERM_RANGE and IPRETERM bits are used to set the termination and pre-charge current. The I_TERM is calculated using the
following equation: If IPRETERM_RANGE is 0, then I_TERM = 500 µA + I_TERMCODE x 500 µA. If IPRETERM_RANGE is 1, then I_TERM = 6
mA + I_TERMCODE x 1 mA. If a value greater than 5 mA (IPRETERM_RANGE = 0) is written, the setting goes to 5 mA. Termination is
disabled if any loop other than CC or DV in control, such as VINDPM, and TS/Cool. The default may be overridden by the external resistor
on IPRETERM.
9.6.6 Battery Voltage Control Register
Memory location 0x05h, Reset State: 0111 1000 (bq25120A)
Figure 30. Battery Voltage Control Register
7 (MSB)
6
5
4
3
2
0
1
1
1
1
0
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
1
0 (LSB)
0
0
R/W
R/W
Table 17. Battery Voltage Control Register
Bit Field
Type
Reset
Description
B7 (MSB) VBREG_6
R/W
0
Battery Regulation Voltage: 640 mV
B6
VBREG_5
R/W
1
Battery Regulation Voltage: 320 mV
B5
VBREG_4
R/W
1
Battery Regulation Voltage: 160 mV
B4
VBREG_3
R/W
1
Battery Regulation Voltage: 80 mV
B3
VBREG_2
R/W
1
Battery Regulation Voltage: 40 mV
B2
VBREG_1
R/W
0
Battery Regulation Voltage: 20 mV
B1
VBREG_0
R/W
0
Battery Regulation Voltage: 10 mV
B0 (LSB)
R/W
0
VBREG Bits: Use VBREG bits to set the battery regulation threshold. The V_BATREG is calcuated using the following equation: V_BATREG = 3.6
V + V_BREGCODE x 10 mV. The charge voltage range is from 3.6 V to 4.65 V. If a value greater than 4.65 V is written, the setting goes to
4.65 V.
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