Battery temperature BTEMP

The battery temperature is measured with a NTC inside the battery pack. The BTEMP line inside transceiver has a 100k pull-up to VREF. The MCU calculates the battery temperature by reading the BTEMP line DC-voltage level with a CCONT (N201) A/D-converter.

Table 11: Battery Temperature

Name

Min

Typ

Max

Unit

Notes

BTEMP

0

VREF

V

Battery temperature indication 100k pull-up resistor to VREF in phone Battery package has NTC pull down resistor: 47kQ. +/-5%@+25°C , B=4050+/-3%

2.1 5

10

3 20

V ms

IBI-pulse,Phone power up by battery (input) Power up pulse width

-5

100k pull-up resistor tolerance

BATTERY

RT NTC

VBATT

BTEMP

BGND

TRANSCEIVER

VREF

100k

Figure 12: Standard Battery, BTEMP Connection

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