Texas Instruments bq78350-R1 Technical Reference

Temperature Protections www.ti.com
30
SLUUBD3D–September 2015–Revised September 2018
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Protections
Status Condition Action
Recovery
SafetyStatus()[UTD] AND
Temperature() ≥ UTD:Recovery
SafetyStatus()[UTD] = 0
OperationStatus()[XDSG] = 0
Class Subclass Name Type Min Max Default Unit
Protections UTD Threshold I2 –400 1500 0 0.1°C
Protections UTD Delay U1 0 255 2 s
Protections UTD Recovery I2 –400 1500 50 0.1°C
3.7.5 Overtemperature FET Protection
The device has an overtemperature protection to limit the FET temperature.
NOTE: This feature is only available when using the bq76930x or bq76940x device: There is only
one external TS available in the bq76920 and this is used for cell temperature.
Status Condition Action
Normal FETTemperature() < OTF:Threshold SafetyAlert()[OTF] = 0
Alert FETTemperature() ≥ OTF:Threshold
SafetyAlert()[OTF] = 1
BatteryStatus()[TDA] = 1, [TCA] = 1
Trip
FETTemperature() ≥ OTF:Threshold for
OTF:Delay duration
SafetyAlert()[OTF] = 0
SafetyStatus()[OTF] = 1
BatteryStatus()[OTA] = 1
BatteryStatus()[TDA] = 0, [TCA] = 0
OperationStatus()[XCHG][XDSG] = 1,1 if FET
Options[OTFET] = 1
Recovery
SafetyStatus()[OTF] AND FETTemperature() ≤
OTF:Recovery
SafetyStatus()[OTF] = 0
BatteryStatus()[OTA] = 0
BatteryStatus()[TDA] = 0, [TCA] = 0
OperationStatus()[XCHG][XDSG] = 0,0
3.8 Precharge Timeout Protection
The device can measure the precharge time and stop charging if it exceeds the adjustable period.
Status Condition Action
Enable
Current() > PTO:Charge Threshold AND
ChargingStatus()[PCHG] = 1
Start PTO timer
SafetyAlert()[PTOS] = 0
Suspend or Recovery Current() < PTO:Suspend Threshold
Stop PTO timer
SafetyAlert()[PTOS] = 1
Trip PTO timer > PTO:Delay
Stop PTO timer
SafetyStatus()[PTO] = 1
BatteryStatus()[TCA] = 1
Charging is not allowed.
Reset
SafetyStatus()[PTO] = 1 AND
(Discharge by an amount of PTO:Reset)
Stop and reset PTO timer
SafetyAlert()[PTOS] = 0
SafetyStatus()[PTO] = 0
BatteryStatus()[TCA] = 0
Charging is allowed.
Class Subclass Name Type Min Max Default Unit
Protections PTO Charge Threshold I2 –32768 32767 2000 mA
Protections PTO Suspend Threshold I2 –32768 32767 1800 mA
Protections PTO Delay U2 0 65535 1800 s
Protections PTO Reset I2 –32768 32767 2 mAh

Texas Instruments bq78350-R1 Specifications

General

Brand	Texas Instruments
Model	bq78350-R1
Category	Controller
Language	English