Texas Instruments bq78350-R1 Technical Reference

External Override Permanent Fail www.ti.com
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SLUUBD3D–September 2015–Revised September 2018
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Permanent Fail
Status Condition Action
Normal DSG FET off AND Current() > DFET:OFF Threshold PFAlert()[DFETF] = 0
Alert DSG FET off AND Current() ≤ DFET:OFF Threshold PFAlert()[DFETF] = 1
Trip
DSG FET off AND Current() continuously ≤ DFET:OFF
Threshold for DFET:OFF Delay duration
PFAlert()[DFETF] = 0
PFStatus()[DFETF] = 1
BatteryStatus()[TCA] = 1
BatteryStatus()[TDA] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail DFET OFF Threshold I2 –500 0 –5 mA
Permanent Fail DFET Delay U1 0 255 5 s
4.13 External Override Permanent Fail
The device can detect an external override signal sent to the companion bq769x0 AFE, which can cause
permanent failure of the battery. This can be used to indicate to the bq78350-R1 that an external circuit,
such as an independent voltage protection circuit, has disabled the battery permanently.
Status Condition Action
Normal AFESysStat() [OVRD_ALERT] = 0 PFAlert()[AFE_OVRD] = 0
Alert AFESysStat() [OVRD_ALERT] = 1 PFAlert()[AFE_OVRD] = 1
Trip
AFESysStat() [OVRD_ALERT] = 1 continuously for AFE
External Override: Delay duration
PFAlert()[AFE_OVRD] = 0
PFStatus()[AFE_OVRD] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFE External Override Delay U1 0 255 5 s
4.14 AFE Register Permanent Fail
The device compares the AFE hardware register periodically with a RAM backup and corrects any errors.
If any errors are found during the check, the device increments the AFE register fail counter. If the
comparison fails too many times, the device disables the pack permanently.
Status Condition Action
Normal AFE register fail counter = 0
PFAlert()[AFER] = 0
Compare AFE register and RAM backup every
AFER:Compare Period
Alert AFE register fail counter > 0
PFAlert()[AFER] = 1
Decrement AFE register fail counter by one after
each AFER:Delay Period
Compare AFE register and RAM backup every
AFER:Compare Period
Trip AFE register fail counter ≥ AFER:Threshold
PFAlert()[AFER] = 0
PFStatus()[AFER] = 1
BatteryStatus()[TCA] = 1
BatteryStatus()[TDA] = 1
Class Subclass Name Type Min Max Default Unit
Permanent Fail AFER Threshold U1 0 255 100 counts
Permanent Fail AFER Delay Period U1 0 255 2 s
Permanent Fail AFER Compare Period U1 0 255 5 s

Texas Instruments bq78350-R1 Specifications

General

Brand	Texas Instruments
Model	bq78350-R1
Category	Controller
Language	English