参数资料
| 型号： | LTC4101EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/30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
When AC is present, the LTC4101 samples the value of
the SafetySignal and updates the ChargerStatus register
approximately every 32ms. The state machine successively
samples the SafetySignal value starting with the RES_OR
The SafetySignal impedance is interpreted according to
Table 4.
Table 4. SafetySignal State Ranges
≥ RES_COLD threshold, then RES_C0LD ≥ RES_IDEAL
SafetySignal
CHARGE
threshold, RES_IDEAL ≥ RES_HOT threshold, and ?nally
the RES_HOT ≥ RES_UR threshold. Once the SafetySig-
nal range is determined, the lower value thresholds are
not sampled. The SafetySignal decoder block uses the
previously determined SafetySignal value to provide the
appropriate adjustment in threshold to add hysteresis.
The R THB resistor value is used to measure the RES_OR
RESISTANCE
0Ω to 500Ω
500Ω to 3kΩ
3kΩ to 30kΩ
30kΩ to 100kΩ
STATUS BITS
RES_UR,
RES_HOT
BATTERY_PRESENT
RES_HOT
BATTERY_PRESENT
BATTERY_PRESENT
RES_COLD
DESCRIPTION
Underrange
Hot
Ideal
Cold
≥ RES_COLD and RES_COLD ≥ RES_IDEAL thresholds by
connecting the THB pin to V DD and measuring the voltage
resultant on the THA pin. The R THA resistor value is used
to measure the RES_IDEAL ≥ RES_HOT and RES_HOT ≥
RES_UR thresholds by connecting the THA pin to V DD and
measuring the voltage resultant on the THB pin.
The SafetySignal decoder block uses a voltage divider
network between V DD and GND to determine SafetySig-
nal range thresholds. Since the THA and THB inputs are
sequentially connected to V DD , this provides V DD noise
immunity during SafetySignal measurement.
When AC power is not available the SafetySignal block
supports the following low power operating features:
BATTERY_PRESENT
Above 100kΩ RES_OR Overrange
RES_COLD
Note: The underrange detection scheme is a very important feature of the
LTC4101. The R THA /R SafetySignal divider trip point of 0.333 ? V DD (1V) is well
above the 0.047 ? V DD (140mV) threshold of a system using a 10k pull-up.
A system using a 10k pull-up would not be able to resolve the important
underrange to hot transition point with a modest 100mV of ground offset
between battery and SafetySignal detection circuitry. Such offsets are
anticipated when charging at normal current levels.
The required values for R THA and R THB are shown in
Table 5.
Table 5. SafetySignal External Resistor Values
EXTERNAL RESISTOR VALUE ( Ω )
1. The SafetySignal is sampled every 250ms or less,
instead of 32ms.
R THA
R THB
1130 ±1%
54.9k ±1%
2. A full SafetySignal status is sampled every 30s or less,
instead of every 32ms.
C SS represents the capacitance between the SafetySignal
and GND. C SS may be added to provide additional noise
immunity from transients in the application. C SS cannot
exceed 1nF if the LTC4101 is to properly sense the value
of R SafetySignal .
4101fa
18
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