參數(shù)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(shù)： 8/73頁
文件大小： 1094K
代理商： BQ20Z80DBT-V101
www.ti.com
Short-Circuit Protection
bq20z80-V101
SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005
The bq20z80 short-circuit protection is controlled by the bq29312A, but is recovered by the bq20z80. This allows
different recovery methods to accommodate various applications.
The bq29312A charge short-circuit and discharge short-circuit protection are configured by the bq20z80 in
DF:AFE SC Chg Cfg (see bq29312A SCC register) and DF:AFE SC Dsg Cfg (see bq29312A SCD register),
respectively. See the 'Short-circuit Detection' section of the bq29312A data sheet for more details and the
appropriate values to use.
SBS.SAFETYSTATUS( )
Short Circuit
DF NAME
FET
DF CLEAR THRESHOLD
AND DF:Nonremovable Cfg
Charge
AFE SC Chg Cfg
CHG
ASCC
AFE SC Recovery
Discharge
AFE SC Dsg Cfg
DSG
ASCD
When the bq29312A detects a short circuit in charge or short circuit in discharge fault, the charge and discharge
FETs are turned off, the XALERT pin of the bq20z80 is driven low by the XALERT pin of the bq29312A and the
bq29312A is interrogated. When the bq20z80 identifies the short-circuit condition (charge or discharge current
direction), the internalAFE_Current_Fault timer is started from 0, either of SBS.BatteryStatus( ) [TCA, TDA] are
set, SBS.ChargingCurrent( ) and SBS.ChargingVoltage( ) is set to 0, and SBS.SafetyStatus( ) [ASCC, ASCD] is
set. If the short-circuit condition is in discharge, then SBS.OperationStatus( ) [XDSG] is also set.
However, when the bq20z80 has SBS.SafetyStatus( ) [ASCC[ set, the CHG FET is turned on again, as long as
SBS.Current( ) is reported to
≤ DF:Dsg Current Threshold. Also, when the bq20z80 has SBS.SafetyStatus( )
[SCD[ set, the DSG FET is turned on again, as long as SBS.Current( ) is reported to be
≥ DF:Chg Current
Threshold. No other flags change state until full recovery is reached. This prevents overheating of charge- or
discharge-FET body diode during operation. This action is not affected by the state of DF:Operation Cfg B [NR].
Each bq20z80 short-circuit protection feature can be individually configured to recover via two different methods,
based on DF:Operation Cfg B [NR].
Standard Recovery is where DF:Operation Cfg B [NR] = 0 and the overcurrent tier is not selected in
DF:Non-Removable Cfg. When the pack is removed and re-inserted, the condition is cleared. Pack removal and
re-insertion is detected by transition on the PRES input from low to high to low. When the tier is not selected in
DF:Non-Removable Cfg, that particular feature uses the Nonremovable Battery Mode recovery.
Nonremovable
Battery
Mode
Recovery
is
where
DF:Operation
Cfg
B
[NR]
=
1.
The
state
of
DF:Non-Removable Cfg has no consequence when DF:Operation Cfg B [NR] = 1. This recovery requires
SBS.AverageCurrent( ) to be
≤ DF:AFE SC Recovery threshold and for the internal AFE_Current_Fault timer to
be
≥ DF:Current Recovery Time.
When the recovery condition for a charging fault is detected, the charge FET is allowed to be turned on if other
safety and configuration states permit. The ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1, ZVCHG0]
are set appropriately. When this occurs, SBS.BatteryStatus( ) [TCA] is reset, SBS.ChargingCurrent( ) and
SBS.ChargingVoltage( ) are set to the appropriate values per the charging algorithm, and the appropriate
SBS.SafetyStatus( ) flag is reset.
When the recovery condition for a discharging fault is detected, the discharge FET is allowed to be turned on if
other safety and configuration states permit. The ZVCHG FET is turned off if DF:Operation Cfg A [ZVCHG1,
ZVCGH0] are set appropriately. When this occurs SBS.BatteryStatus( ) [TDA] is reset, SBS.ChargingCurrent( )
and
SBS.ChargingVoltage(
)
are
set
to
the
appropriate
value
per
the
charging
algorithm,
and
SBS.OperationStatus( ) [XDSG] and the appropriate SBS.SafetyStatus( ) flags are reset.
VALID
SIZE
DEFAULT
NAME
CLASS / SUBCLASS
FORMAT
UNITS
RANGE
(BYTES)
VALUE
Low Nibble = AFE SC Chg
AFE SC Chg Cfg
0x77
High Nibble = AFE SC Chg Time
0x00 to
Hex
1
N/A
1st Level Safety /
0xff
Low Nibble = AFE SC Dsg
Current (1)
AFE SC Dsg Cfg
0x77
High Nibble = AFE SC Dsg Time
AFE SC Recovery
Integer
0 to 200
2
mA
1
16
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