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L6924U bảng dữ liệu(PDF) 24 Page - STMicroelectronics

tên linh kiện L6924U
Giải thích chi tiết về linh kiện  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  38 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L6924U bảng dữ liệu(HTML) 24 Page - STMicroelectronics

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Application information: monitoring and protection
L6924U
24/38
8.1
NTC thermistor
The device allows designers to monitor the battery temperature by measuring the voltage
across an NTC or PTC resistor. Li-Ion batteries have a narrow range of operating
temperature, usually from 0 °C to 50 °C. This window is programmable by an external
divider which is comprised of an NTC thermistor connected to GND and a resistor
connected to VREF. When the voltage on the TH pin exceeds the minimum or maximum
voltage threshold (internal window comparator), the device stops the charge process, and
indicates a fault condition through the status pin.
When the voltage (and thus, the temperature), returns to the window range, the device re-
starts the charging process. Moreover, there is a hysteresis for both the upper and lower
thresholds, as shown in Figure 18.
Note:
TBAT = OK when the battery temperature between 0 °C and 50 °C
Figure 17.
Battery temperature control flow chart
Figure 18.
Voltage window with hysteresis on TH
V
MINTH
V
MAXTH
V
MINTH_HYS
V
MAXTH_HYS
900mV
780mV
225mV
248mV
Voltage
Variationon THpin
Charge disable
Charge enable



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