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AFE Communication Permanent Fail
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SLUUBD3D–September 2015–Revised September 2018
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Permanent Fail
4.15 AFE Communication Permanent Fail
The device monitors the internal communication to the AFE hardware and increments the AFE read/write
fail counter on any communication error. If the read or write fails exceed a limit within a configurable
timeframe, the device disables the pack permanently.
Status Condition Action
Normal AFE read/write fail counter = 0 PFAlert()[AFEC] = 0
Alert AFE read/write fail counter > 0
PFAlert()[AFEC] = 1
Decrement AFE read/write fail counter by one
after each AFEC:Delay Period
Trip Read and Write Fail counter ≥ AFEC:Threshold
PFAlert()[AFEC] = 0
PFStatus()[AFEC] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFEC Threshold U1 0 255 100 counts
Permanent Fail AFEC Delay Period U1 0 255 5 s
4.16 AFE XREADY Permanent Fail
The companion bq769x0 AFE includes an internal self-check, and if this check fails, then the XREADY bit
is set. Each time the bq78350-R1 reads the AFE it checks this bit, and if it is set, then increments an
internal counter. If this counter reaches a configurable limit, then the device disables the pack
permanently.
Status Condition Action
Normal XREADY counter = 0 PFAlert()[AFE_XRDY] = 0
Alert XREADY counter > 0
PFAlert()[AFE_XRDY] = 1
Decrement AFE_XRDY counter by one after each AFE
XREADY:Delay period
Trip XREADY counter ≥ XREADY: Threshold
PFAlert()[AFE_XRDY] = 0
PFStatus()[AFE_XRDY] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFE XREADY Threshold U1 0 255 100 counts
Permanent Fail AFE XREADY Delay Period U1 0 255 5 s
4.17 Instruction Flash (IF) Checksum Permanent Fail
The device can permanently disable the battery if it detects a difference between the stored IF checksum
and the calculated IF checksum only following a device reset.
Status Condition Action
Normal Stored and calculated IF checksum match —
Trip Stored and calculated IF checksum after reset does not match.
PFStatus()[IFC] = 1
BatteryStatus()[TCA] = 1
BatteryStatus()[TDA] = 1
4.18 Data Flash (DF) Permanent Fail
The device can permanently disable the battery in case a data flash write fails.
NOTE: A DF write failure causes the gauge to disable further DF writes.
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