BQ24721 Datasheet, PDF (35/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
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SBS-Like SMBus: SBS Translator Voltage DAC Commands Implemented
SLUS683 – NOVEMBER 2005
Charging Voltage, (0x15), Write/Read
BIT
0 (LSB)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 (MSB)
SBS SPEC
1 mV
2 mV
4 mV
8 mV
16 mV
32 mV
64 mV
128 mV
256 mV
512 mV
1024 mV
2048 mV
4096 mV
8192 mV
16384 mV
32768 mV
bq24721 SBS-Like
CHARGE VOLTAGE LOOK-UP TABLE
NA
0 / 2 mV
0 / 4 mV
0 / 8 mV
0 / 16 mV
0 / 32 mV
0 / 64 mV
0 / 128 mV
0 / 256 mV
0 / 512 mV
0 / 1024 mV
0 / 2048 mV
0 / 4096 mV
0 / 8192 mV
0 / 16384 mV
NA
Not used
NOTES
See Notes below for valid voltage range
and minimum step size (resolution⁽¹⁾)
Not used
(1) Note: Battery voltage range: 4 V–4.8 V per cell
3 Cell range: 12 V to (12 V–14.4 V); step size = 18.75 mV
4 Cell range: 16 V to (16 V –19.2 V) ; step size = 25 mV
a. Valid voltages are 9 V, 12 V–14.4 V, and 16 V–19.2 V. Intermediate programmed voltages between Internal DAC values are
truncated to the lower value to avoid overvoltage on battery.
b. Programmed Voltages above max 19.2 V → Charger is enabled and the voltage regulation value is set to the maximum 19.2 V.
c. Programmed voltages below 12 V (except 9 V), and between 14.4 V–16 V → Charger is disabled, VOR bit is triggered, and an alarm
is sent to the host.
d. Programmed 9 V (9000 mV = 2328 Hex) → Charger regulates to 9 V output for battery wakeup.
SBS-Like SMBus: IC Internal Voltage DAC for Reference Only
Internal decoder translates the SBS voltage register value into the internal closest value. Values are truncated to the lower
valid setting.
Charging Voltage, IC Internal Only
BIT
0 (LSB)
1
2
3
4
5
6 (MSB)
0/18.75 mV
0 / 37.5 mV
0 / 75 mV
0 / 150 mV
0 / 300 mV
0 / 600 mV
0 / 1.2 V
LO – 12 V
bq24721 SBS-Like
CHARGE VOLTAGE INTERNAL
DECODER DAC
0/25 mV
0 / 50 mV
0 / 100 mV
0 / 200 mV
0 / 400 mV
0 / 800 mV
0 / 1.6 V
HI – 16 V
NOTES
Offset that can be added to dc level
See the following notes for valid voltage range and
minimum step size (resolution) ⁽¹⁾
3 Cell or 4 Cell dc level select
(1) Note: Battery voltage range: 4 V–4.8 V per cell
3 Cell range: 12 V to (12 V–14.4 V); step size = 18.75 mV
4 Cell range: 16 V to (16 V –19.2 V) ; step size = 25 mV
a. Valid voltages are 9 V, 12 V–14.4 V, and 16 V–19.2 V. Intermediate programmed voltages between Internal DAC values are
truncated to the lower value to avoid over-voltage on battery.
b. Programmed Voltages above max 19.2 V → Charger is enabled and the voltage regulation value is set to the maximum 19.2 V.
c. Programmed voltages below 12 V (except 9 V), and between 14.4 V–16 V → Charger is disabled, VOR bit is triggered, and an alarm
is sent to the host.
d. Programmed 9 V (9000 mV = 2328 Hex) → Charger regulates to 9 V output for battery wake-up.
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