Introduction
21
SLUUBD3D – September 2015 – Revised September 2018
Copyright © 2015–2018, Texas Instruments Incorporated
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.