Texas Instruments bq78350-R1 Technical Reference

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21
SLUUBD3D–September 2015–Revised September 2018
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Protections
Table 3-2. Enabled Removal Recovery B
Class Subclass Name Format Size in Bytes Min Max Default Unit
Settings Protection
Enable
Removable
Recovery B
Hex 1 0x00 0xff 0x00 —
7 6 5 4 3 2 1 0
RSVD OCDL RSVD RSVD RSVD RSVD RSVD RSVD
RSVD (Bit 7): Reserved. Do not use.
OCDL (Bit 6): OCDL Protection Removal recovery
0 = Standard recovery only enabled (default)
1 = Removal recovery only enabled
RSVD (Bits 5–0): Reserved. Do not use.
3.1.4 FET Action Options for Current Protections
The bq78350-R1 offers the option to turn off the CHG FET during an overcurrent in discharge (OCD),
overcurrent in discharge latch (OCDL), overload (AOLD), overload latch (AOLDL) or short circuit in
discharge (ASCD), short circuit in discharge latch (ASCDL) faults, or the DSG FET in overcurrent in
charge (OCC) faults.
The CHG FET will turn off for the OCD, OCDL, AOLD, AOLDL, ASCD, and ASCDL faults when
[DC_CHG_OFF] in Protection Configuration is set.
The DSG FET will turn off for the OCC faults when [CC_DSG_OFF] in Protection Configuration is set.
3.2 Cell Undervoltage Protection
The device can detect undervoltage in batteries and protect cells from damage by preventing further
discharge.
Upon CUV detection, a snapshot of the measured cell voltages are made available in CUVSnapshot().
This snapshot is available until the next instance of a CUV fault, as this causes the data to be updated to
the latest set of measurements.
Status Condition Action
Normal All Cell voltages in CellVoltage1..15() > CUV:Threshold
SafetyAlert()[CUV] = 0
BatteryStatus()[TDA] = 0
Alert
Any Cell voltages in CellVoltage1..15() ≤
CUV:Threshold
SafetyAlert()[CUV] = 1
BatteryStatus()[TDA] = 1
Trip
Any Cell voltages in CellVoltage1..15() ≤
CUV:Threshold for CUV:Delay duration
SafetyAlert()[CUV] = 0
SafetyStatus()[CUV] = 1
BatteryStatus()[FD] = 1
OperationStatus()[XDSG] = 1
Discharging is not allowed.
Recovery
SafetyStatus()[CUV] = 1 AND
All Cell voltages in CellVoltage1..15() ≥ CUV:Recovery
AND
Protection Configuration[CUV_RECOV_CHG] = 0 OR
[CUV_RECOV_CHG] = 1
AND Charging detected (that is, BatteryStatus[DSG] = 0)
SafetyStatus()[CUV] = 0
BatteryStatus()[FD] = 0, [TDA] = 0
OperationStatus()[XDSG] = 0
Discharging is allowed.

Texas Instruments bq78350-R1 Specifications

General

Brand	Texas Instruments
Model	bq78350-R1
Category	Controller
Language	English