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Safety Cell Overvoltage Permanent Fail
37
SLUUBD3D–September 2015–Revised September 2018
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Permanent Fail
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFE SUV Threshold I2 1580 3100 1750 mV
Permanent Fail AFE SOV/AFE SUV SOV and SUV Delay U1 0 255 2 s
This register is representative of the bq769x0 PROTECT 3 register.
Class Subclass Name Format
Size in
Bytes
Min Max Default Unit
Settings
AFE SOV/AFE
SUV
SOV and SUV
Delay
Hex 1 0x00 0xF0 0x50 —
7 6 5 4 3 2 1 0
SUV_D1 SUV_D0 SOV_D1 SOV_D0 RSVD RSVD RSVD RSVD
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
SUV_D1:0 (Bits 7–6): Safety Undervoltage Delay Time
00 = 1 s
01 = 4 s
10 = 8 s
11 = 16 s
SOV_D1:0 (Bits 5–4): Safety Overvoltage Delay Time
00 = 1 s
01 = 2 s
10 = 4 s
11 = 8 s
RSVD: (Bits 3–0): Reserved
4.5 Safety Cell Overvoltage Permanent Fail
The bq78350-R1 uses the OV Protection function of the companion AFE for this feature and can be
configured to permanently disable the battery in the case of severe overvoltage in any of the cells. This
feature cannot be disabled.
The voltage threshold setting is set in AFE SOV:Threshold, which the device will map to the available
settings in the companion AFE with the maximum setting of 4703 mV and the minimum of 3140 mV.
The delay timing configuration for this feature is combined in the same register with the delay time of the
Safety Undervoltage feature.
Status Condition Action
Normal AFEStatus() [OV] = 0 PFStatus()[SOV] = 0
Trip AFEStatus() [OV] = 1
PFStatus()[SOV] = 1
BatteryStatus()[TDA] = 1
BatteryStatus()[TCA] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFE SOV Threshold I2 3150 4700 4350 mV
4.6 Safety Overcurrent in Charge Permanent Fail
The device can permanently disable the battery in the case of a severe OVERCURRENT IN CHARGE
state.
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