參數資料
型號： BQ20Z80DBT-V101
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO38
封裝： GREEN, PLASTIC, TSSOP-38
文件頁數： 13/73頁
文件大小： 1094K
代理商： BQ20Z80DBT-V101
www.ti.com
2nd LEVEL PROTECTION FEATURES
Actions on Detection of 2nd Level (Permanent) Failure
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
The bq20z80 provides features that can be used to indicate a more serious fault via the SAFE and SAFE
outputs. These outputs can be used to blow an in-line fuse to permanently disable the battery pack from charge
or discharge activity.
When the bq20z80 SBS.PFStatus( ) changes from 0x00 to indicate a permanent failure then the following actions
are taken in sequence.
CHG, DSG, and ZVCHG FETs are turned OFF.
SBS.BatteryStatus( ) [TCA, TDA] are set.
A backup of SBS data is stored to data flash including SBS.Voltage( ), SBS.CellVoltage1( ),
SBS.CellVoltage2( ), SBS.CellVoltage3( ), SBS.CellVoltage4( ), SBS.Current( ), SBS.Temperature( ),
SBS.BatteryStatus( ), SBS.RemaingCapacity( ) , SBS.SafetyStatus( ), SBS.ChargingStatus( ), AFE.Data
(complete memory map).
Data Flash write access is then disabled, but the data flash can be read.
SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) are set to 0.
The appropriate bit in DF:PF Flag 1 is set.
If the appropriate bit in DF:Permanent Fail Cfg is set, then 0x3672 is programmed to DF:Fuse Flag, the
SAFE pin is driven and latched low, and the SAFE pin is driven and latched high.
SBS.SafetyStatus( ) [PF] is set.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
PF Flags 1
0x0000 to 0xffff
2
N/A
0x0000
Hex
Fuse Flag
0x0000 or 0x3672
2
N/A
0x0000
PF Voltage
2
mV
0
PF C1 Voltage
2
mV
0
PF C2 Voltage
0 to 65535
2
mV
0
PF C3 Voltage
Integer
2
mV
0
PF C4 Voltage
2
mV
0
2nd Level Safety / Device
PF Current
–32768 to 32767
2
mA
0
Status Data (96)
PF Temperature
–9999 to 9999
2
0.1
°C
0
PF Batt Stat
Hex
0x0000 to 0xffff
2
N/A
0x0000
PF RC-mAh
2
mAh
0
Integer
0 to 65535
PF RC-10mWh
2
10mWh
0
PF Chg Status
0x0000 to 0xffff
2
N/A
0x0000
PF Safety Status
Hex
2
N/A
0x0000
PF Flags 2
2
N/A
0x0000
AFE Status
0x00 to 0xff
1
N/A
0x00
AFE Output
0x00 to 0xff
1
N/A
0x00
AFE State
0x00 to 0xff
1
N/A
0x00
AFE Function
0x00 to 0xff
1
N/A
0x00
2nd Level Safety / AFE Regs
AFE Cell Select
Hex
0x00 to 0xff
1
N/A
0x00
(97)
AFE OLV
0x00 to 0xff
1
N/A
0x00
AFE OLT
0x00 to 0xff
1
N/A
0x00
AFE SCC
0x00 to 0xff
1
N/A
0x00
AFE SCD
0x00 to 0xff
1
N/A
0x00
20
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