Battery Temperatur Measurement

The battery temperature is measured during charging. The BTEMP pin to the battery is pulled up on baseband by a 47 kohm resistor to logic supply voltage, 3.2V. The voltage on the BTEMP pin is a function of the battery pack temperature. Auxiliary A/D channel 3 is used for this purpose. Inside the battery pack there is a 47 kohm NTC resistor to ground. The A/D converter value can be calculated from the following formula:

A/D = RNTC/(RNTC+47 kohm)x1023

where RNTC is the value of the NTC resistor inside the battery pack.

The relation ship between different battery temperature, BTEMP voltage and A/D converter values are shown in following table.

A/D Converter Values for Different Battery Temperatures

Bat. temp. NTC value BTEMP voltage A/D conv. value

Dummy

1 kW

0.06 V

21

-2S

74S.60 kW

2.96 V

962

0

164.96 kW

2.4S V

796

2S

47 kW

1.S8 V

S12

S0

16.26 kW

0.81 V

263

70

7.78 kW

0.4S V

14S

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