BQ25700A Datasheet, PDF (40/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

bq25700A
SLUSCQ8 – MAY 2017
8.6.1.5 ProchotOption0 Register (SMBus address = 33h) [reset = 04A54h]
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Figure 21. ProchotOption0 Register (SMBus address = 33h) [reset = 04A54h]
15-11
ILIM2_VTH
R/W
10-9
ICRIT_DEG
R/W
8
Reserved
R/W
7-6
5
4-3
VSYS_VTH
EN_PROCHOT
_EXT
PROCHOT_WIDTH
R/W
R/W
R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
2
PROCHOT_
CLEAR
R/W
1
INOM_DEG
R/W
0
Reserved
R/W
Table 15. ProchotOption0 Register (SMBus address = 33h) Field Descriptions
SMBus
BIT
FIELD
TYPE RESET DESCRIPTION
15-11 ILIM2_VTH
R/W
01001b _{ILIM2 Threshold}
5 bits, percentage of IDPM in 0x3FH. 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
10-9 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 us)
11b: 800 µs (max 1 ms)
8 Reserved
R/W
0b
Reserved
Table 16. ProchotOption0 Register (SMBus address = 33h) Field Descriptions
SMBus
BIT
FIELD
7-6 VSYS_VTH
5 EN_PROCHOT
_EXT
4-3 PROCHOT
_WIDTH
TYPE
R/W
R/W
R/W
RESET
01b
0b
10b
DESCRIPTION
VSYS Threshold
Measure on VSYS with fixed 20-µs deglitch time. Trigger when SYS pin voltage is
below the threshold.
00b: 5.75 V (2-4 s) or 2.85 V (1 s)
01b: 6 V (2-4 s) or 3.1 V (1 s) <default at POR>
10b: 6.25 V (2-4 s) or 3.35 V (1 s)
11b: 6.5 V (2-4 s) or 3.6 V (1 s)
When pulse extension is enabled, keep the PROCHOT pin voltage LOW until host
writes 0x33[2] = 0.
0b: Disable pulse extension <default at POR>
1b: Enable pulse extension
PROCHOT Pulse Width
PROCHOT Pulse Extension Enable
Minimum PROCHOT pulse width when REG0x33[5] = 0
00b: 100 µs
01b: 1 ms
10b: 10 ms <default at POR>
11b: 5 ms
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