JAJSM11 may 2021 BQ25720
PRODUCTION DATA
To set the minimum system voltage, write a 16-bit VSYS_MIN register command (REG0x3E()) using the data format listed in Figure 9-29, Table 9-48, and Table 9-49. The charger provides minimum system voltage range from 1.0V to 19.2 V, with 100-mV step resolution. Any write below 1.0V or above 19.2 V 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.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
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 |
SMBus BIT |
FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
15 | Min System Voltage, bit 7 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 12800 mV of system voltage. |
14 | Min System Voltage, bit 6 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 6400mV of system voltage. |
13 | Min System Voltage, bit 5 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 3200 mV of system voltage. |
12 | Min System Voltage, bit 4 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 1600 mV of system voltage. |
11 | Min System Voltage, bit 3 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 800 mV of system voltage. |
10 | Min System Voltage, bit 2 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 400 mV of system voltage. |
9 | Min System Voltage, bit 1 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 200 mV of system voltage. |
8 | Min System Voltage, bit 0 | R/W | 0b | 0 = Adds 0 mV of system voltage. 1 = Adds 100 mV of system voltage. |
SMBus BIT |
FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
7-0 | Reserved | R/W | 00000000b | Not used. Value Ignored. |