Texas Instruments bq78350-R1 Technical Reference

www.ti.com Overcurrent in Discharge Protection
23
SLUUBD3D–September 2015–Revised September 2018
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Protections
Class Subclass Name Type Min Max Default Unit Description
Protections OCC Threshold I2 –32768 32767 6000 mA
Overcurrent in Charge trip
threshold
Protections OCC Delay U1 0 255 6 s
Overcurrent in Charge trip
delay
Protections OCC
Recovery
Threshold
I2 –32768 32767 –200 mA
Overcurrent in Charge
recovery threshold
Protections OCC
Recovery
Delay
U1 0 255 5 s
Overcurrent in Charge
recovery delay
3.5 Overcurrent in Discharge Protection
The device has two independent overcurrent in discharge protections that can be set to different current
and delay thresholds to accommodate different load behaviors. See Section 3.1.4 for additional FET
action options.
Status Condition Action
Normal Current() > OCD:Threshold SafetyAlert()[OCDL] = 0, if OCDL counter = 0
Alert OCDL counter > 0
SafetyAlert()[OCDL] = 1, Decrement OCDL counter by
one after each OCD:Counter Dec Delay period
Trip
Current() continuous ≤ OCD:Threshold for
OCD:Delay duration
SafetyAlert()[OCD] = 0
SafetyStatus()[OCD] = 1
OperationStatus()[XDSG] = 1
DSG FET is disabled.
Increment OCDL counter.
Latch OCDL counter ≥ OCD:Latch Limit
SafetyAlert()[OCDL] = 0
SafetyStatus()[OCDL] = 1
OperationStatus()[XDSG] = 1
DSG FET is disabled.
Recovery
[SafetyStatus()[OCD] = 1 AND Protection
Configuration:VAUXR = 0
Current() continuous ≥ OCD:Recovery Threshold
for OCD:Recovery Delay time
SafetyStatus()[OCD] = 0
OperationStatus()[XDSG] = 0
Discharging is allowed.
Recovery
[SafetyStatus()[OCD] = 1 AND Protection
Configuration:VAUXR = 1
Current() continuous ≥ OCD:Recovery Threshold
for OCD:Recovery Delay time OR VAUXVoltage()
≥ Power:Charger Present Threshold
SafetyStatus()[OCD] = 0
OperationStatus()[XDSG] = 0
Discharging is allowed.
Latch Reset SafetyStatus()[OCDL] = 1 for OCD: Reset Time
SafetyStatus()[OCDL] = 0
Reset OCDL counter
OperationStatus()[XDSG] = 0
DSG FET returns to normal if SafetyStatus()[OCD] = 0.
Class Subclass Name Type Min Max Default Unit Description
Protections OCD Threshold I2 –32768 32767 –6000 mA Overcurrent in Discharge trip threshold
Protections OCD Delay U1 0 255 6 s Overcurrent in Discharge trip delay
Protections OCD
Recovery
Threshold
I2 –32768 32767 200 mA Overcurrent in Discharge recovery threshold
Protections OCD
Recovery
Delay
U1 0 255 5 s Overcurrent in Discharge recovery delay
Protections OCDL Latch Limit U1 0 255 0 counts Overcurrent in Discharge latch limit
Protections OCDL
Counter Dec
Delay
U1 0 255 10 s
Overcurrent in Discharge counter decrement
delay
Protections OCDL Reset U1 0 255 15 s Overcurrent in Discharge latch reset delay

Texas Instruments bq78350-R1 Specifications

General

Brand	Texas Instruments
Model	bq78350-R1
Category	Controller
Language	English