SLUSE64 May 2021 BQ25723
PRODUCTION DATA
To set the minimum system voltage, write a 16-bit VSYS_MIN register command (REG0x3E()) using the data format listed in Figure 9-37, Table 9-50 , and Table 9-51 . The charger provides minimum system voltage range from 1.0V to 19.2V, with 100-mV step resolution. Any write below 1.0V or above 19.2V is ignored. Upon POR, the VSYS_MIN register is 3.6 V for 1 S, 6.6V for 2 S and 9.2 V for 3 S, and 12.3 V for 4 S. Writing VSYS_MIN to 0 will set it to the default value based on CELL_BATPRESZ pin.
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
VSYS_MIN, bit 7 | VSYS_MIN, bit 6 | VSYS_MIN, bit 5 | VSYS_MIN, bit 4 | VSYS_MIN, bit 3 | VSYS_MIN, bit 2 | VSYS_MIN, bit 1 | VSYS_MIN, bit 0 |
R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reserved | |||||||
R/W |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
BIT | FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
7 | Min System Voltage, bit 7 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 12800 mV of system voltage. |
6 | Min System Voltage, bit 6 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 6400mV of system voltage. |
5 | Min System Voltage, bit 5 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 3200 mV of system voltage. |
4 | Min System Voltage, bit 4 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 1600 mV of system voltage. |
3 | Min System Voltage, bit 3 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 800 mV of system voltage. |
2 | Min System Voltage, bit 2 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 400 mV of system voltage. |
1 | Min System Voltage, bit 1 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 200 mV of system voltage. |
0 | Min System Voltage, bit 0 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 100 mV of system voltage. |
BIT | FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
7-0 | Reserved | R/W | 00000000b | Not used. Value Ignored. |