参数资料
型号: SC900841JVKR2
厂商: Freescale Semiconductor
文件页数: 127/192页
文件大小: 0K
描述: IC POWER MGT 338-MAPBGA
标准包装: 2,000
应用: PC,PDA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 338-TFBGA
供应商设备封装: 338-MAPBGA
包装: 带卷 (TR)
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FUNCTIONAL DEVICE OPERATION
BATTERY INTERFACE AND POWER PATH MANAGEMENT
and the temperature range is set at 0°C to 45°C. NTC
circuitry cannot be disabled during charging.
During discharging, the user has an option to turn the NTC
block off through the TEMPEN bit. Whenever an NTC ADC
reading is desired or to keep battery temperature monitor on,
this bit must be asserted. Turning this block off and
disconnecting the switch saves on quiescent current and
enhances battery life. During discharging, the battery
temperature monitoring range is set at -10°C to 60°C.
The window thresholds are specified as a ratio of the V NTC
voltage. The battery thermistor check circuit compares the
correspond to one of the previous ranges, depending if the IC
is charging or discharging the battery.
During charging, if the battery temperature is not within
range, charging is stopped and the TEMP interrupt signal is
asserted, to indicate a battery temperature fault. During
discharging if the battery temperature is not within range, the
TEMP interrupt signal is asserted.
The tolerance should include the resistive divider error, as
well as the comparator offset error. Other applications may
not require an NTC interface. In that case, the NTC resistor is
not populated and this feature is disabled.
fraction of V NTC at NTC pin, with two preset thresholds which
V CORE
VNTC
Overtemp
V HOT
Undertemp
V COLD
R NTC
NTC
NTC
Figure 65. NTC Thermistor Interface
COIN CELL BATTERY BACKUP/
CHARGER
The COIN CELL pin provides a connection for a coin cell
backup battery or supercap. If the main battery is deeply
discharged or removed, and in the absence of a USB/Wall
input source, the RTC system and coin cell maintained logic,
will switch over to the COIN CELL for backup power. A small
capacitor should be placed from the COIN CELL pin to
ground under all circumstances.
The coin cell charger circuit will function as a current
limited voltage source, resulting in the CC/CV taper
characteristic, typically used for rechargeable Lithium-Ion
batteries. The coin cell charger is enabled via the
COINCHGEN bit. which is enabled by default. The output
voltage (V COIN ) is programmable through the VCOIN[2:0]
bits. The coin cell charger voltage is programmable in the
active state, where the charge current is fixed at I COINHI . The
coin cell charging will be stopped when V PWR goes below
V PWRUVF . Reference Power Path Manager SPI Registers for
a more detailed description of the coin cell related bits.
A large capacitor, electrolytic or super cap, can also be
used instead of a lithium based coin cell. To avoid discharge
by leakage currents from external components or by the
900841, the COINCHGEN bit should always remain set.
Coin cell charge is equipped with a disconnect circuitry
that isolates the coin cell from any loads, if V COIN goes below
2.0 V, to prevent the coin cell from being deeply discharged
and damaged. This will also cause the ADC reading of the
coin cell voltage to yield zero.
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
127
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