Canon BJC 50 Service Manual - Page 131

Canon BJC 50 - Color Inkjet Printer Manual

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BJC-50 Part 4: Technical Reference 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. TABLE 4-4 BATTERY TEMPERATURE Battery temperature THBAT -30°C ≥ THBAT 0°C ≥ THBAT 0°C ≥ THBAT 45°C ≥ THBAT>0°C THBAT > 45°C THBAT > 60°C A/D value Determination by THBAT 965~1024 No battery 814~1024 Cannot start recharging 835~1024 Recharging stop 408~813 Permission to start recharging 0~407 Cannot start recharging 0~336 Recharging stop Lithium Ion Battery Pack Vcc1(+5V) IC 11 IC 6 ASIC C Analog Switch THBAT T Thermistor AD 3 ICP 2 Figure 4-30 Battery Temperature Detection Circuit 4-43

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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.
4-43
BJC-50
Part 4: Technical Reference
TABLE 4-4 BATTERY TEMPERATURE
Battery temperature THBAT
-30°C
≥
THBAT
0°C
≥
THBAT
0°C
≥
THBAT
45°C
≥
THBAT>0°C
THBAT > 45°C
THBAT > 60°C
A/D value
965~1024
814~1024
835~1024
408~813
0~407
0~336
Determination by THBAT
No battery
Cannot start recharging
Recharging stop
Permission to start recharging
Cannot start recharging
Recharging stop
Vcc1(+5V)
THBAT
Lithium Ion
Battery Pack
IC 11
IC 6
ASIC
AD 3
ICP 2
C
T
Thermistor
Analog
Switch
Figure 4-30 Battery Temperature Detection Circuit