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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)： | 15/73頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | BQ20Z80DBT-V101 |
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Safety Overcurrent Protection
Safety Overtemperature Protection
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
The bq20z80 reports a safety-overcurrent condition for either charge (SBS.Current( ) = positive) or discharge
(SBS.Current( ) = negative). A fault is reported when SBS.Current( ) is
≥ the DF:SOC Chg or DF:SOC Dsg
threshold for a period
≥DF:SOC Chg Time or ≥ the DF:SOC Dsg Time. During the period between the time
when excessive current, in charge, is first detected and the expiration of DF:SOC Chg Time, SBS.PFAlert( )
[SOCC] is set. Between the time when excessive current, in discharge, is first detected and the expiration of
DF:SOC Dsg TimeSBS.PFAlert( ) [SOCC] is set.
The protection in discharge or charge can be independently configured or disabled. If either DF:Permanent Fail
Cfg [XSOCC, XSOCD] are set, the SAFE pin is driven low and the SAFE pin is driven high. Also, if DF:SOC Chg
Time or DF:SOC Dsg Time are set to 0, this feature is disabled for the respective current direction.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
SOC Chg
0 to 30000
10000
2
mA
SOC Dsg
0 to 30000
10000
2nd Level Safety / Current (17)
Integer
SOC Chg Time
0 to 30
1
s
0 (4 typical)
SOC Dsg Time
0 to 30
1
s
0 (4 typical)
The bq20z80 reports a safety overtemperature condition for either charge (SBS.Current( ) = positive) or
discharge (SBS.Current( ) = negative). A fault is reported when SBS.Temperature( )
≥ DF:SOT Chg or DF:SOT
Dsg threshold for a period
≥ DF:SOT Chg Time or DF:SOT Dsg Time. During the period between the time when
excessive temperature, in charge, is first detected and the expiration of DF:SOT Chg Time, SBS.PFAlert( )
[SOTC] is set. Between the time when excessive temperature, in discharge, is first detected and the expiration of
DF:SOT Dsg Time, SBS.PFAlert( ) [SOTD] is set.
Either discharge or charge protection can be independently configured or disabled. If either DF:Permanent Fail
Cfg [XSOTC, XSOTD] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:SOT Chg Time or
DF:SOT Dsg Time is set to 0, this feature is disabled for the respective current direction.
SIZE
DEFAULT
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
SOT Chg
0 to 1200
2
0.1
°C
650
SOT Chg Time
0 to 30
1
s
0 (4 typical)
2nd Level Safety / Temperature (18)
Integer
SOT Dsg
0 to 1200
2
0.1
°C
750
SOT Dsg Time
0 to 30
1
s
0 (4 typical)
The bq20z80 reports an open thermistor condition when SBS.Temperature( )
≤ DF:Open Thermistor for a time
≥ DF:Open Time .
Between the time when excessive temperature is first detected and the expiration of DF:Open Time,
SBS.PFAlert( ) [OTS] is set. When DF:Open Time expires or is cleared then SBS.PFAlert( ) [OTS] is cleared
If DF:Permanent Fail Cfg [XOTS] is set, the SAFE pin is driven low and the SAFE pin is driven high. If DF:Open
Time is set to 0, this feature is disabled.
VALID
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
UNITS
RANGE
(BYTES)
VALUE
Open Thermistor
-1000 to 1200
2
0.1
°C
–333
2nd Level Safety /
Signed Int
Temperature (18)
Open Time
0 to 30
1
s
0 (4 typical)
22
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