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| 型號(hào)： | 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(yè)數(shù)： | 55/73頁(yè) |
| 文件大?。?/td> | 1094K |
| 代理商： | BQ20Z80DBT-V101 |
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Charge Suspend Mode
Pulse Charging
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
When transitioning from [FCHG] to [TCHG2] or from [TCHG2] to [TCHG1] the there is additional temperature
hyteresis of DF:Temp Hys.
SBS.ChargingStatus( ) [TCHG2, TCHG1] are also cleared when another charging mode is entered, a protection
condition is detected, or the battery is removed while the DF:Operation Cfg B [NR] is set.
However, if DF:DeltaTemp is set to 0, SBS.ChargingCurrent( ) remains DF:Fast Charge Current during fast
charge.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
Delta Temp
Charge Control / Fast Charge Config (34)
Integer
0 to 500
0.1
°C
50
If charging has begun, the bq20z80 suspends charging when:
SBS.AverageCurrent( ) is > the DF:Chg Current Threshold, AND
SBS.Temperature( ) is < DF:Charge Suspend Temp Low AND is > DF:Charge Suspend Temp High.
If DF:Operation Cfg B [CHGSUSP] is set, the CHG FET and ZVCHG FET (if used), are turned off when the
bq20z80 is in charge-suspend mode.
When charging is suspended, SBS.ChargingCurrent( ) is set to 0, and SBS.ChargingStatus( ) [CHGSUSP] is set.
To return to normal charging, SBS.Temperature( ) must be:
≥ DF:Charge Inhibit Temp Low + DF:Temp Hys, AND
≤ DF:Charge Inhibit Temp High–DF:Temp Hys.
The
bq20z80
clears
SBS.ChargingStatus(
)
[CHGSUSP]
when
this
condition
is
met,
and
sets
SBS.ChargingCurrent( ) according to the appropriate charging mode entered. The FETs are also returned to their
previous state at this time.
SBS.ChargingStatus( ) [CHGSUSP] is also cleared when a protection condition is detected, or when the battery
is removed while DF:Operation Cfg B [NR] is cleared.
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
(BYTES)
VALUE
Charge Suspend Temp Low
–400 to 1200
–50
Charge Control /
Signed Int
2
0.1
°C
Fast Charge Config (34)
Charge Suspend Temp High
–400 to 1200
550
Pulse charging is part of the fast-charging mode and is a loop. During the loop, the measured cell voltages are
calculated every 250 ms. This data is not reported via the SBS.CellVoltagex( ) commands.
The pulse-charging loop is entered when the maximum cell voltage is
≥ DF:Max OFF Voltage, OR maximum cell
voltage is
≥ DF:Turn OFF Voltage for DF:Max ON Pulse Time. When these conditions are met, the CHG FET is
turned off, and the SBS.ChargingStatus( ) [PULSE. PULSE_OFF] are set.
If the maximum cell voltage is < DF:Turn ON Voltage, AND the CHG FET is off for DF:Min OFF Pulse Time, the
CHG FET is turned on and SBS.ChargingStatus( ) [PULSE_OFF] cleared.
59
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