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| 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(shù)： | 14/73頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | BQ20Z80DBT-V101 |
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Permanent Failure Flags
Clearing Permanent Failure
Safety Overvoltage Protection
Cell Imbalance Fault Protection
2nd Level Protection IC Input
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
When any NEW cause of PF is detected in SBS.PFStatus( ), the NEW cause is added to DF:PF Flag 1. This
allows DF:PF Flag 1 to show ALL of the different permanent failure conditions that have occurred.
On the first occasion of SBS.PFStatus( ) changing from 0x00 the value is stored to DF:PF Flag 2.
The bq20z80 permanent failure mode can be cleared by sending two SBS.ManufacturerAccess( ) commands in
sequence. See SBS.ManufacturerAccess( ) for more details.
The bq20z80 reports a safety-overvoltage condition when SBS.Voltage( ) is
≥ the DF:SOV Threshold for a period
≥ DF:SOV Time. During the time between when the excessive voltage is first detected and the expiration of
DF:SOV TimeSBS.PFAlert( ) [SOV] is set.
If DF:Permanent Fail Cfg [XSOV] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:SOV
Time is set to 0, this feature is disabled.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
SOV Threshold
0 to 20000
2
mV
18000
2nd Level Safety / Voltage (16)
Integer
SOV Time
0 to 30
1
s
0 (4 typical)
The bq20z80 reports a cell imbalance condition when SBS.Current( ) is
≤ DF:Cell Imbalance Current for a
period of DF:Battery Rest Time, AND the difference between the highest
measured
cell
voltage
(SBS.CellVoltagex( )MAX) and lowest measured cell voltage (SBS.CellVoltagex( )MIN) is
≥ DF:Cell Imbalance
Fail Voltage for a period
≥ DF:Cell Imbalance Time.
During the time between when excessive cell-voltage variance is first detected and the expiration of DF:Cell
Imbalance Time, SBS.PFAlert( ) [CIM] is set.
If DF:Permanent Fail Cfg [XCIM] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:Cell
Imbalance Time is set to 0, this feature is disabled.
CLASS /
SIZE (BYTES)
NAME
FORMAT
VALID RANGE
UNITS
DEFAULT VALUE
SUBCLASS
Cell Imbalance Fail Voltage
0 to 5000
2
mV
1000
Cell Imbalance Time
0 to 30
1
s
0 (4 typical)
2nd Level Safety/
Integer
Voltage (16)
Cell Imbalance Current
0 to 200
1
mA
5
Battery Rest Time
0 to 240
1
s
60
The PFIN input of the bq20z80 can be used to determine the state of an external protection device such as the
bq29400. If this pin is logic low for a period of time
≥ DF:PFIN Detect Time, the Permanent Failure Mode is
entered. During the time between when PFIN is detected low and the expiration of DF:PFIN Detect
TimeSBS.PFAlert( ) [PFIN] is set.
If DF:Permanent Fail Cfg [XPFIN] is set, the SAFE pin is driven low and the SAFE pin is driven high. Also, if
DF:PFIN Detect Time is set to 0, this feature is disabled.
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
SIZE (BYTES)
UNITS
DEFAULT VALUE
PFIN Detect Time
2nd Level Safety / Voltage (16)
Integer
0 to 30
1
s
0 (4 typical)
21
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