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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)： | 54/73頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | BQ20Z80DBT-V101 |
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Precharge Mode
Fast Charge
Fast Charge Temperature Throttling
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
SIZE
DEFAULT
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
Charge Inhibit Temp Low
-400 to 1200
2
0
Charge Inhibit Temp High
Charge Control / Charge Inhibit Config (32)
Signed Int
-400 to 1200
2
0.1
°C
450
Temp Hys
0 to 100
1
10
The bq20z80 sets SBS.ChargingCurrent( ) to DF:Pre-chg Current when SBS.Temperature( ) is
≥ DF:Charge
Inhibit Temp Low, AND is
< DF:Pre-chg Temp, OR if any SBS.CellVoltagex( ) is < DF:Pre-chg Voltage.
Depending on the setting of DF:Operation Cfg A [ZVCHG1, ZVCHG0] FET action may be taken. Precharge
mode is also entered if any of SBS.SafetyStatus( ) [ CUV, PUV, OCD or OCD2] are set.
ZVCHG1
ZVCHG0
FET USED
0
ZVCHG
0
1
CHG
1
0
OD Pin
1
No Action
During precharge SBS.Charging Status( ) [PCHG] is set, and is cleared when SBS.Temperature( ) is
≥ DF:Pre-chg Temp + DF:Temp Hys, AND all SBS.CellVoltagex( ) ≥ DF:Recovery Voltage, or Charge Suspend
is entered, a fault condition detected, or the battery removed if DF:Operation Cfg B [NR] is cleared.
SIZE
DEFAULT
NAME
DESCRIPTION
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
Pre-chg Temp
Signed Int
-400 to 1200
0.1
°C
120
Pre-chg Voltage
0 to 20000
mV
3000
Charge Control / Pre-Charge Config (33)
2
Recovery Voltage
Integer
0 to 20000
mV
3100
Pre-chg Current
0 to 2000
mA
250
The bq20z80 sets SBS.ChargingCurrent( ) to DF:Fast Charge Current andSBS.ChargingVoltage( ) to DF:Fast
Charge Voltage when the following are true.
SBS.Temperature( )
≥ DF:Pre-chgTemp
SBS.Temperature( ) < DF:Charge Suspend Temp High - (2 x DF:Delta Temp)
SBS.CellVoltagex( )
≥ DF:Pre-chg Voltage
SBS.Voltage( )
≤ SBS.ChargingVoltage( ) + DF:Over Charging Voltage
See the Charging Faults section for further details. During fast charge, SBS.ChargingStatus( ) [FCHG] is set and
the CHG FET is turned on if no protection conditions are detected.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
Fast Charge Voltage
0 to 2,0000
2
mV
16,800
Fast Charge Current
Charge Control / Fast Charge Config (34)
Integer
0 to 10,000
2
mA
4000
Over Charging Voltage
0 to 2000
2
mV
500
The bq20z80 alters SBS.ChargingCurrent( ) and sets SBS.ChargingStatus( ) [TCHG2, TCHG1] during fast
charge in response to changing temperature conditions. If SBS.Temperature( ) is
≤DF:Charge Suspend Temp
High AND is
≥ DF:Charge Suspend Temp High - DF:DeltaTemp, then SBS.ChargingCurrent( ) is set to
DF:Pre-chg Current and SBS.ChargingStatus( ) [TCHG1] is set.
If SBS.Temeprature( ) is < DF:Charge Suspend Temp High - DF:Delta Temp, AND is
≥ DF:Charge Suspend
Temp High– (2 x DF:DeltaTemp), SBS.ChargingCurrent( ) is set to (DF:Fast Charge Current –DF:Pre-chg
Current) / 2, and SBS.ChargingStatus( ) [TCHG2] is set.
If SBS.Temperature( ) is < DF:Charge Suspend Temp High– (2 x DF:Delta Temp) AND is
≥ DF:Pre-Chg Temp,
SBS.ChargingCurrent( ) is set to DF:Fast Charge Current, and SBS.ChargingStatus( ) TCHG2, TCHG1] are
cleared.
58
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