Texas Instruments bq78350-R1, Technical Reference

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Hardware-Based Protection
27 SLUUBD3D – September 2015 – Revised September 2018
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Protections
Class Subclass Name Format
Size in
Bytes
Min Max Default Unit
Settings ASCD
Threshold and
Delay
Hex 1 0x00 0xFF 0x00 —
7 6 5 4 3 2 1 0
RSNS RSVD RSVD SCD_D1 SCD_D0 SCD_T2 SCD_T1 SCD_T0
LEGEND: RSVD = Reserved Location
RSNS (Bit 7) : AOLD and ASCD Thresholds Divisor
0 = 0.5 × AFE Protection Thresholds (default)
1 = Normal AFE Protection Thresholds
RSVD (Bits 6–5) : Reserved. Do not use.
SCD_D1:0 (Bits 4–3) : ASCD Delay Time
00 = 70 µs
01 = 100 µs
10 = 200 µs
11 = 400 µs
SCD_T2:0 (Bits 2–0) : ASCD Thresholds with RSNS = 1
000 = 44 mv
001 = 67 mv
010 = 89 mv
011 = 111 mv
100 = 133 mv
101 = 155 mv
110 = 178 mv
111 = 200 mv
SCD_T2:0 (Bits 2–0) : ASCD Thresholds with RSNS = 0
000 = 22 mv
001 = 33 mv
010 = 44 mv
011 = 56 mv
100 = 67 mv
101 = 78 mv
110 = 89 mv
111 = 100 mv
3.6.3 AFE ALERT OVRD Protection
The device can detect an external override signal sent to the companion bq769x0 AFE that can cause
permanent failure of the battery. This new option provides a temporary fault detection that acts on the
FETs. The permanent failure option is not affected by this change.