ZHCSO21 may 2021 BQ25720
PRODUCTION DATA
To set the charge current, write a 16-bit ChargeCurrent() command (REG0x14h()) using the data format listed in Figure 9-9, Table 9-12, and Table 9-13.
With 10-mΩ sense resistor, the charger provides charge current range of 0 A to 8.128 A, with a 64-mA step resolution.
Upon POR, ChargeCurrent() is 0 A. Below scenarios will also reset Charge current to zero:
Charge current is not reset in force converter latch off fault (REG0x20[2]), and ACOC/TSHUT/SYSOVP/ACOV/VSYS_UVP/BATOVP/BATOC faults.
The SRP and SRN pins are used to sense voltage drop across RSR with default value of 10 mΩ. However, the host can always set current sensing to 5 mΩ referring to Section 9.3.6. For a smaller sense resistor, a smaller sense voltage is given, and a lower regulation accuracy; but at the benefit of lower conduction loss.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
Reserved | Charge Current, bit 6 | Charge Current, bit 5 | Charge Current, bit 4 | Charge Current, bit 3 | Charge Current, bit 2 | ||
R/W | R/W | R/W | R/W | R/W | R/W | ||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Charge Current, bit 1 | Charge Current, bit 0 | Reserved | Reserved | ||||
R/W | R/W | R/W | R/W |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
SMBus BIT | FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
15-13 | Reserved | R/W | 000b | Not used. 1 = invalid write. |
12 | Charge Current, bit 6 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 4096 mA of charger current. |
11 | Charge Current, bit 5 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 2048 mA of charger current. |
10 | Charge Current, bit 4 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 1024 mA of charger current. |
9 | Charge Current, bit 3 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 512 mA of charger current. |
8 | Charge Current, bit 2 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 256 mA of charger current. |
SMBus BIT | FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
7 | Charge Current, bit 1 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 128 mA of charger current. |
6 | Charge Current, bit 0 | R/W | 0b | 0 = Adds 0 mA of charger current. 1 = Adds 64 mA of charger current. |
5-0 | Reserved | R/W | 000000b | Not used. Value Ignored. |