Hello,
I was testing to make sure that charging would be interrupted if the temperature went too high. I used a hot air gun to heat (just) the thermistor I will be incorporating into my battery pack with the bq20z95 coulomb counter. It worked the first two times, by interrupting the current to the pack and resuming charge a short time later, but the third time, it has opened both the chg and dchg FETs and set the SOTD flag. How can I clear this flag and restore the pack? I was not expecting a permanent failure, just for charging to stop until the temperature went down again. Can anyone spot what went wrong and suggest a solution?
Thank you,
Jeremy.
[Header]
bq EVSW Version = 0.9.86
DeviceName = bq20z95 v1.50
Time = 4/02/2014 10:26:39 PM
[Voltage(1st Level Safety)]
COV Threshold = 3750
COV Time = 2
COV Recovery = 3550
COV Delta = 20
COV Temp. Hys = 10.0
POV Threshold = 11475
POV Time = 2
POV Recovery = 10650
CUV Threshold = 2400
CUV Time = 2
CUV Recovery = 2500
PUV Threshold = 7300
PUV Time = 2
PUV Recovery = 7500
[Current(1st Level Safety)]
OC (1st Tier) Chg = 1562
OC (1st Tier) Chg Time = 2
OC Chg Recovery = 200
OC (1st Tier) Dsg = 1250
OC (1st Tier) Dsg Time = 2
OC Dsg Recovery = 400
OC (2nd Tier) Chg = 1875
OC (2nd Tier) Chg Time = 2
OC (2nd Tier) Dsg = 1500
OC (2nd Tier) Dsg Time = 2
Current Recovery Time = 8
AFE OC Dsg = 00
AFE OC Dsg Time = 0F
AFE OC Dsg Recovery = 5
AFE SC Chg Cfg = 00
AFE SC Dsg Cfg = 74
AFE SC Recovery = 1
[Temperature(1st Level Safety)]
Over Temp Chg = 70.0
OT Chg Time = 2
OT Chg Recovery = 65.0
Over Temp Dsg = 75.0
OT Dsg Time = 2
OT Dsg Recovery = 70.0
[Host Comm(1st Level Safety)]
Host Watchdog Timeout = 0
[Voltage(2nd Level Safety)]
SOV Threshold = 11850
SOV Time = 5
Cell Imbalance Current = 5
Cell Imbalance Fail Voltage = 1000
Cell Imbalance Time = 5
Battery Rest Time = 1800
Min CIM-check voltage = 3000
PFIN Detect Time = 5
[Current(2nd Level Safety)]
SOC Chg = 2500
SOC Chg Time = 1
SOC Dsg = 4000
SOC Dsg Time = 1
[Temperature(2nd Level Safety)]
SOT Chg = 75.0
SOT Chg Time = 5
SOT Dsg = 75.0
SOT Dsg Time = 5
Open Thermistor = -33.3
Open Time = 0
[FET Verification(2nd Level Safety)]
FET Fail Limit = 20
FET Fail Time = 5
[AFE Verification(2nd Level Safety)]
AFE Check Time = 0
AFE Fail Limit = 10
AFE Fail Recovery Time = 20
AFE Init Retry Limit = 6
AFE Init Limit = 20
[Fuse Verification(2nd Level Safety)]
Fuse Fail Limit = 2
Fuse Fail Time = 0
[Charge Inhibit Cfg(Charge Control)]
Chg Inhibit Temp Low = -20.0
Chg Inhibit Temp High = 60.0
Temp Hys = 1.0
[Pre-Charge Cfg(Charge Control)]
Pre-chg Current = 62
Pre-chg Temp = 12.0
Pre-chg Voltage = 3000
Recovery Voltage = 3100
[Fast Charge Cfg(Charge Control)]
Fast Charge Current = 1250
Charging Voltage = 10950
Delta Temp = 5.0
Suspend Low Temp = -20.0
Suspend High Temp = 70.0
[Pulse Charge Cfg(Charge Control)]
Turn ON Voltage = 4150
Turn OFF Voltage = 4250
Max ON Pulse Time = 60.00
Min OFF Pulse Time = 0.00
Max OFF Voltage = 4270
[Termination Cfg.(Charge Control)]
Maintenance Current = 0
Taper Current = 62
Taper Voltage = 225
Current Taper Window = 40
TCA Set % = -1
TCA Clear % = 95
FC Set % = -1
FC Clear % = 98
[Cell Balancing Cfg(Charge Control)]
Min Cell Deviation = 1750
[Charging Faults(Charge Control)]
Over Charging Voltage = 500
Over Charging Volt Time = 2
Over Charging Current = 500
Over Charging Curr Time = 2
Over Charging Curr Recov = 100
Depleted Voltage = 7500
Depleted Voltage Time = 2
Depleted Recovery = 8000
Over Charge Capacity = 125
Over Charge Recovery = 2
FC-MTO = 10800
PC-MTO = 3600
Charge Fault Cfg = 00
[Data(SBS Configuration)]
Rem Cap Alarm = 125
Rem Energy Alarm = 1340
Rem Time Alarm = 10
Init Battery Mode = 0081
Design Voltage = 10800
Spec Info = 0031
Manuf Date = 01-Jan-1980
Ser. Num. = 0001
Cycle Count = 1
CC Threshold = 1125
CC % = 90
CF MaxError Limit = 100
Design Capacity = 1250
Design Energy = 13490
Manuf Name =
Device Name = bq20z95
Device Chemistry = LION
[Configuration(SBS Configuration)]
TDA Set % = 6
TDA Clear % = 8
FD Set % = 2
FD Clear % = 5
TDA Set Volt Threshold = 5000
TDA Set Volt Time = 5
TDA Clear Volt = 5500
FD Set Volt Threshold = 5000
FD Volt Time = 5
FD Clear Volt = 5500
[Manufacturer Data(System Data)]
Pack Lot Code = 0000
PCB Lot Code = 0000
Firmware Version = A41B
Hardware Revision = 0000
Cell Revision = 0000
[Manufacturer Info(System Data)]
Manuf. Info =
[Lifetime Data(System Data)]
Lifetime Max Temp = 117.6
Lifetime Min Temp = 20.0
Lifetime Max Cell Voltage = 3500
Lifetime Min Cell Voltage = 3174
Lifetime Max Pack Voltage = 14000
Lifetime Min Pack Voltage = 9586
Lifetime Max Chg Current = 1500
Lifetime Max Dsg Current = -3000
Lifetime Max Chg Power = 15000
Lifetime Max Dsg Power = -15000
Life Max AvgDsg Cur = -1000
Life Max AvgDsg Pow = -1500
Lifetime Avg Temp = 24.2
[Lifetime Temp Samples(System Data)]
LT Temp Samples = 32
[Registers(Configuration)]
Operation Cfg A = 0E29
Operation Cfg B = 6449
Operation Cfg C = 0000
Permanent Fail Cfg = 0000
Non-Removable Cfg = 0000
[AFE(Configuration)]
AFE.State_CTL = 00
[LED Cfg(LED Support)]
LED Flash Rate = 2.000
LED Blink Rate = 1.000
LED Delay = 48.8
LED Hold Time = 4
CHG Flash Alarm = 10
CHG Thresh 1 = 0
CHG Thresh 2 = 20
CHG Thresh 3 = 40
CHG Thresh 4 = 60
CHG Thresh 5 = 80
DSG Flash Alarm = 10
DSG Thresh 1 = 0
DSG Thresh 2 = 20
DSG Thresh 3 = 40
DSG Thresh 4 = 60
DSG Thresh 5 = 80
Sink Current = 3
[Power(Power)]
Flash Update OK Voltage = 7500
Shutdown Voltage = 5250
Shutdown Time = 10
Cell Shutdown Voltage = 1750
Cell Shutdown Time = 10
Charger Present = 3000
Sleep Current = 10
Bus Low Time = 5
Cal Inhibit Temp Low = 5.0
Cal Inhibit Temp High = 45.0
Sleep Voltage Time = 5
Sleep Current Time = 20
Wake Current Reg = 00
[IT Cfg(Gas Gauging)]
Load Select = 1
Load Mode = 1
Term Voltage = 6600
User Rate-mA = 0
User Rate-mW = 0
Reserve Cap-mAh = 0
Reserve Cap-mWh = 0
[Current Thresholds(Gas Gauging)]
Dsg Current Threshold = 100
Chg Current Threshold = 50
Quit Current = 10
Dsg Relax Time = 1
Chg Relax Time = 60
[State(Gas Gauging)]
Qmax Cell 0 = 1250
Qmax Cell 1 = 1250
Qmax Cell 2 = 1250
Qmax Cell 3 = 1250
Qmax Pack = 1250
Update Status = 04
Avg I Last Run = -248
Avg P Last Run = -232
Delta Voltage = 183
[R_a0(Ra Table)]
Cell0 R_a flag = 0555
Cell0 R_a 0 = 401
Cell0 R_a 1 = 496
Cell0 R_a 2 = 443
Cell0 R_a 3 = 412
Cell0 R_a 4 = 466
Cell0 R_a 5 = 546
Cell0 R_a 6 = 755
Cell0 R_a 7 = 860
Cell0 R_a 8 = 900
Cell0 R_a 9 = 965
Cell0 R_a 10 = 1410
Cell0 R_a 11 = 2315
Cell0 R_a 12 = 4876
Cell0 R_a 13 = 6445
Cell0 R_a 14 = 12713
[R_a1(Ra Table)]
Cell1 R_a flag = 0555
Cell1 R_a 0 = 355
Cell1 R_a 1 = 439
Cell1 R_a 2 = 392
Cell1 R_a 3 = 365
Cell1 R_a 4 = 412
Cell1 R_a 5 = 483
Cell1 R_a 6 = 608
Cell1 R_a 7 = 675
Cell1 R_a 8 = 604
Cell1 R_a 9 = 594
Cell1 R_a 10 = 844
Cell1 R_a 11 = 1267
Cell1 R_a 12 = 1847
Cell1 R_a 13 = 3486
Cell1 R_a 14 = 6881
[R_a2(Ra Table)]
Cell2 R_a flag = 0555
Cell2 R_a 0 = 357
Cell2 R_a 1 = 442
Cell2 R_a 2 = 394
Cell2 R_a 3 = 367
Cell2 R_a 4 = 415
Cell2 R_a 5 = 486
Cell2 R_a 6 = 674
Cell2 R_a 7 = 796
Cell2 R_a 8 = 785
Cell2 R_a 9 = 852
Cell2 R_a 10 = 1277
Cell2 R_a 11 = 2155
Cell2 R_a 12 = 4338
Cell2 R_a 13 = 5733
Cell2 R_a 14 = 11302
[R_a3(Ra Table)]
Cell3 R_a flag = FF55
Cell3 R_a 0 = 105
Cell3 R_a 1 = 130
Cell3 R_a 2 = 116
Cell3 R_a 3 = 108
Cell3 R_a 4 = 122
Cell3 R_a 5 = 143
Cell3 R_a 6 = 180
Cell3 R_a 7 = 252
Cell3 R_a 8 = 263
Cell3 R_a 9 = 248
Cell3 R_a 10 = 268
Cell3 R_a 11 = 292
Cell3 R_a 12 = 318
Cell3 R_a 13 = 420
Cell3 R_a 14 = 829
[R_a0x(Ra Table)]
xCell0 R_a flag = FFFF
xCell0 R_a 0 = 105
xCell0 R_a 1 = 130
xCell0 R_a 2 = 116
xCell0 R_a 3 = 108
xCell0 R_a 4 = 122
xCell0 R_a 5 = 143
xCell0 R_a 6 = 180
xCell0 R_a 7 = 252
xCell0 R_a 8 = 263
xCell0 R_a 9 = 248
xCell0 R_a 10 = 268
xCell0 R_a 11 = 292
xCell0 R_a 12 = 318
xCell0 R_a 13 = 420
xCell0 R_a 14 = 829
[R_a1x(Ra Table)]
xCell1 R_a flag = FFFF
xCell1 R_a 0 = 105
xCell1 R_a 1 = 130
xCell1 R_a 2 = 116
xCell1 R_a 3 = 108
xCell1 R_a 4 = 122
xCell1 R_a 5 = 143
xCell1 R_a 6 = 180
xCell1 R_a 7 = 252
xCell1 R_a 8 = 263
xCell1 R_a 9 = 248
xCell1 R_a 10 = 268
xCell1 R_a 11 = 292
xCell1 R_a 12 = 318
xCell1 R_a 13 = 420
xCell1 R_a 14 = 829
[R_a2x(Ra Table)]
xCell2 R_a flag = FFFF
xCell2 R_a 0 = 105
xCell2 R_a 1 = 130
xCell2 R_a 2 = 116
xCell2 R_a 3 = 108
xCell2 R_a 4 = 122
xCell2 R_a 5 = 143
xCell2 R_a 6 = 180
xCell2 R_a 7 = 252
xCell2 R_a 8 = 263
xCell2 R_a 9 = 248
xCell2 R_a 10 = 268
xCell2 R_a 11 = 292
xCell2 R_a 12 = 318
xCell2 R_a 13 = 420
xCell2 R_a 14 = 829
[R_a3x(Ra Table)]
xCell3 R_a flag = FFFF
xCell3 R_a 0 = 105
xCell3 R_a 1 = 130
xCell3 R_a 2 = 116
xCell3 R_a 3 = 108
xCell3 R_a 4 = 122
xCell3 R_a 5 = 143
xCell3 R_a 6 = 180
xCell3 R_a 7 = 252
xCell3 R_a 8 = 263
xCell3 R_a 9 = 248
xCell3 R_a 10 = 268
xCell3 R_a 11 = 292
xCell3 R_a 12 = 318
xCell3 R_a 13 = 420
xCell3 R_a 14 = 829
[Device Status Data(PF Status)]
PF Flags 1 = 0008
Fuse Flag = 00
PF Voltage = 10056
PF C4 Voltage = 0
PF C3 Voltage = 3350
PF C2 Voltage = 3352
PF C1 Voltage = 3355
PF Current = 3
PF Temperature = 372.6
PF Batt Stat = 58C0
PF RC-mAh = 614
PF RC-10mWh = 5800
PF Chg Status = 0000
PF Safety Status = C000
PF Flags 2 = 0008
[AFE Regs(PF Status)]
AFE Status = 00
AFE Output = 08
AFE State = 00
AFE Function = 00
AFE Cell Select = 00
AFE OLV = 00
AFE OLT = 0F
AFE SCC = 00
AFE SCD = 74
[Data(Calibration)]
CC Gain = 10.553
CC Delta = 10.553
Ref Voltage = 1224.35
AFE Pack Gain = 672.91
CC Offset = -0.308
Board Offset = 0
Int Temp Offset = 0.0
Ext1 Temp Offset = 0.0
Ext2 Temp Offset = 0.0
[Config(Calibration)]
CC Current = 3000
Voltage Signal = 16800
Temp Signal = 298.0
CC Offset Time = 250
ADC Offset Time = 32
CC Gain Time = 250
Voltage Time = 1984
Temperature Time = 32
Cal Mode Timeout = 300
[Temp Model(Calibration)]
Ext Coef 1 = -28285
Ext Coef 2 = 20848
Ext Coef 3 = -7537
Ext Coef 4 = 401.2
Ext Min AD = 0
Ext Max Temp = 401.2
Int Coef 1 = 0
Int Coef 2 = 0
Int Coef 3 = -11136
Int Coef 4 = 575.4
Int Min AD = 0
Int Max Temp = 575.4
[Current(Calibration)]
Filter = 239
Deadband = 3
CC Deadband = 10.0