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BJC-50
c) Battery temperature detection
The thermistor inside the lithium ion battery pack measures the internal battery
temperature and detects whether the battery is installed or not. This thermistor is
connected between the T terminal and negative terminal of the battery pack. ASIC
uses the A/D value of the thermistor's output voltage, THBAT, to determine whether
the battery temperature is normal. If it is, the recharging will begin.
Battery temperature THBAT
-30°C
0°C
THBAT
0°C
THBAT
45°C
THBAT > 45°C
THBAT > 60°C
Lithium Ion
Battery Pack
Thermistor
TABLE 4-4 BATTERY TEMPERATURE
A/D value
THBAT
965~1024
814~1024
835~1024
THBAT>0°C
408~813
Vcc1(+5V)
C
T
ICP 2
Figure 4-30 Battery Temperature Detection Circuit
Determination by THBAT
No battery
Cannot start recharging
Recharging stop
Permission to start recharging
0~407
Cannot start recharging
0~336
Recharging stop
IC 11
Analog
Switch
THBAT
4-43
Part 4: Technical Reference
IC 6
ASIC
AD 3
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