User Guide

NPM-10 (3595)

System Module CC Technical Documentation

The monitored battery functions are battery voltage (VBATADC), battery type (BSI), and

battery temperature (BTEMP) indication.

The battery type is recognized through a resistive voltage divider. In the phone there is a

100 kOhm pull up resistor in the BSI line and the battery has a pull-down resistor in the

same line. Depending on the battery type, the pull-down resistor value is changed. The

battery temperature is measured equivalently, except that the battery has a NTC pull-

down resistor in the BTEMP line.

KEYB1&2 inputs are made for keyboard scanning purposes. These inputs are also routed

internally to the miscellaneous block. The KEYB1&2 inputs are not used, and the

connected interrupts must be kept disabled by the SW.

The HEADINT and HOOKINT are external accessory detection inputs used for monitoring

voltage levels in these inputs. They are routed internally from the miscellaneous block

and they are connected to the converter through a 2:1 multiplexer.

PATEMP and VCXOTEMP channels are not used as originally intended. PATEMP input is

used for the detection of accessory covers (CTI). VCXOTEMP is not used in NPM-10

(3595).

(1)

AD converter is calibrated in production.

Table 21: Slow A/D Converter Characteristics

Characteristics Min Typ Max Unit

Number of bits 10 bits

Integral nonlinearity - - +/- 2 LSB

Differential nonlinearity - - +/- 2.5 LSB

Conversion time - - 11 µs

Input voltage range

(1)

0-2.7V

Input capacitance 4 5 6 pF

Table 22: Slow A/D Converter Input Ranges

Signal Min Typ Max Unit Notes

VBATADC 2.7 - 5.25 V Physical input on UEM is VBATREGS

ICHAR VBATADC - VBATADC+0.316 V

VCHARADC 0.1 - 1.35 V

BSI 0 - 2.7 V

BTEMP 0 - 2.7 V

PATEMP 0 - 2.7 V Used for CTI