参数资料
| 型号： | LTC4101EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BATT CHRG 24-SSOP |
| 标准包装： | 59 |
| 功能： | 充电管理 |
| 电池化学： | 智能电池 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
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LTC4101
OPERATION
The RES_UR bit is set only when the SafetySignal resis-
tance value is less than 575Ω.
ALARM_INHIBITED bit is set if a valid AlarmWarning()
message has been received and charging is inhibited as
a result. This bit is cleared if both ChargingVoltage() and
ChargingCurrent() are rewritten to the LTC4101, power is
removed (DCDIV < V ACP ), or if a battery is removed. The
setting of the ALARM_INHIBITED will activate the LTC4101
SMBALERT pull-down.
POWER_FAIL bit is set if the LTC4101 does not have suf-
?cient DCIN voltage to charge the battery or if an external
device is pulling the CHGEN input signal low. Charging is
disabled whenever this bit is set. The setting of this bit
does not clear the values in the ChargingVoltage() and
ChargingCurrent() function values, nor does it necessarily
affect the charging modes of the LTC4101.
BATTERY_PRESENT is set if a battery is present other-
wise it is cleared. The LTC4101 uses the SafetySignal
in order to determine battery presence. If the LTC4101
detects a RES_OR condition, the BATTERY_PRESENT
ChargingCurrent() ('h14)
Description: The Battery, System Host or other master de-
vice sends the desired charging current (mA) to the LTC4101.
Purpose: The LTC4101 uses R ILIM , the granularity of the
I DAC , and the value of the ChargingCurrent() function to
determine its charging current supplied to the battery. The
charging current will never exceed the maximum current
permitted by R ILIM . The ChargingCurrent() value will be
truncated to the granularity of the I DAC . The charging cur-
rent will also be reduced if the battery voltage exceeds the
programmed charging voltage.
? SMBus Protocol: Write Word.
Input: The CHARGING_CURRENT is an unsigned 16 bit
integer specifying the requested charging current in mA.
The following table de?nes the maximum permissible
value of CHARGING_CURRENT that will not set the CUR-
RENT_OR in the ChargerStatus() function for a given
value of the R ILIM :
R ILIM ChargingCurrent() Current
bit is cleared immediately. The LTC4101 will not set the
BATTERY_PRESENT bit until it successfully samples the
SafetySignal twice and does not detect a RES_OR condi-
Short to GND
10kΩ ±1%
33kΩ ±1%
0x0000 through 0x03FF 0mA through 1023mA
0x0000 through 0x07FF 0mA through 2047mA
0x0000 through 0x0BFF 0mA through 3071mA
tion on either sampling. If AC is not present (e.g. DCDIV
< V ACP ), this bit may not be set for up to one-half second
Open (or short to V DD ) 0x0000 through 0x0FFF
0mA through 4095mA
after the battery is connected to the SafetySignal. The
ChargingCurrent() and ChargingVoltage() function val-
ues are immediately cleared whenever this bit is cleared.
Charging will never be allowed if this bit is cleared. A
change in BATTERY_PRESENT will activate the LTC4101
SMBALERT pull-down.
AC_PRESENT is set if the voltage on DCDIV is greater than
V ACP . This does not necessarily indicate that the voltage
on DCIN is suf?cient to charge the battery. A change in
AC_PRESENT will activate the LTC4101 SMBALERT pull-
down.
ChargingVoltage() ('h15)
Description: The Battery, SMBus Host or other master
device sends the desired charging voltage (mV) to the
LTC4101.
Purpose: The LTC4101 uses R VLIM , the granularity of the
V DAC , and the value of the ChargingVoltage() function to
determine its charging voltage supplied to the battery. The
charging voltage will never be forced beyond the voltage
permitted by R VLIM . The ChargingVoltage() value will be
truncated to the granularity of the V DAC . The charging
voltage will also be reduced if the battery current exceeds
the programmed charging current.
? SMBus Protocol: Write Word.
Input: The CHARGING_VOLTAGE is an unsigned 16-bit
integer specifying the requested charging voltage in mV.
The LTC4101 considers any value from 0x0001 through
0x044F the same as writing 0x0000. The following
4101fa
14
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