ZHCSNB8A February 2021 – January 2024 BQ25730
PRODUCTION DATA
To set VSYS_TH1 threshold to trigger discharging VBUS in VAP mode, write a 6-bit VSYS_TH1 register command (REG0x36<7:2>()) using the data format listed in Figure 8-29, Table 8-34, and Table 8-35. The charger Measure on VSYS with fixed 5-µs deglitch time. Trigger when SYS pin voltage is below the thresholds. The threshold range from 3.2 V (000000b) to 9.5 V (111111b) for 2s~5s and 3.2 V (000000b) to 3.9 V (000111b) for 1S, with 100-mV step resolution. There is a fixed DC offset which is 3.2 V. Under 1S application writing beyond 3.9 V will be ignored. For example 000111b and xxx111b result in same VSYS_TH1 setting 3.9 V. Upon POR, the VSYS_TH1 threshold to trigger VBUS discharge in VAP mode is 3.4 V (000010b) for 1S and 6.400 V (100000b) for 2s~5s.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| ILIM2_VTH | ICRIT_DEG | PROCHOT_VINDPM_80_90 | |||||
| R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| VSYS_TH1 | INOM_DEG | LOWER_PROCHOT_VINDPM | |||||
| R/W | 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 |
| BIT | FIELD | TYPE | RESET | DESCRIPTION |
|---|---|---|---|---|
| 7-3 | ILIM2_VTH | R/W | 01001b | ILIM2 Threshold 5 bits, percentage of IIN_DPM in 0x25/24. Measure current between ACP and ACN. Trigger when the current is above this threshold: 00001b - 11001b: 110% - 230%, step 5% 11010b - 11110b: 250% - 450%, step 50% 11111b: Out of Range (Ignored) Default 150%, or 01001 |
| 2-1 | ICRIT_DEG | R/W | 01b | ICRIT Deglitch time ICRIT threshold is set to be 110% of ILIM2. Typical ICRIT deglitch time to trigger PROCHOT. 00b: 15 µs 01b: 100 µs <default at POR> 10b: 400 µs (max 500 μs) 11b: 800 µs (max 1 ms) |
| 0 | PROCHOT_VINDPM_80_90 | R/W | 0b | Lower threshold of the PROCHOT_VINDPM comparator When REG0x36[0]=1, the threshold of the PROCHOT_VINDPM comparator is determined by this bit setting. 0b: 83% of VinDPM threshold <default at POR>. 1b: 91% of VinDPM threshold |
| BIT | FIELD | TYPE | RESET | DESCRIPTION |
|---|---|---|---|---|
| 7-2 | VSYS_TH1 | R/W | 100000b(2S~5s) 000010b(1S) |
VSYS Threshold to trigger discharging VBUS in VAP mode. Measure on VSYS with fixed 5-µs deglitch time. Trigger when SYS pin voltage is below the thresholds. There is a fixed DC offset which is 3.2 V. 2S - 5s battery (Default: 6.4 V) 000000b- 111111b: 3.2 V - 9.5 V with 100-mV step size. 1S battery (Default: 3.4 V) XXX000b - XXX111b: 3.2 V - 3.9 V with 100-mV step size. |
| 1 | INOM_DEG | R/W | 0b | INOM Deglitch Time INOM is always 10% above IIN_DPM register setting. Measure current between ACP and ACN. Trigger when the current is above this threshold. 0b: 1 ms(max) <default at POR> 1b: 60 ms(max) |
| 0 | LOWER_PROCHOT_VINDPM | R/W | 1b | Enable the lower threshold of the PROCHOT_VINDPM comparator 0b: the threshold of the PROCHOT_VINDPM comparator follows the same VINDPM REG0x0B/0A() setting. 1b: the threshold of the PROCHOT_VINDPM comparator is lower and determined by PROCHOT_VINDPM_80_90 bit setting. <default at POR> |