User Guide

NMM-3 Company Confidential
7 - System Module & UI CCS Technical Documentation
Page 7-12 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
The monitored battery functions are:
• Battery voltage (VBATADC),
• Battery type (BSI)
• Battery temperature (BTEMP).
The battery type is recognized through a resistive voltage divider. In phone there is a
100kOhm pull up resistor to VFLASH1 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 NTC pull
down resistor used for temperature sensing is on the phone.
The monitored charger functions are:
• Charger Voltage (VCHAR)
• Charger current (ICHAR)
The voltage measured across a 0R22 resistor (R200) in circuit with charger voltage out
from UEME is used to determine ICHAR.
The HEADINT and HOOKINT are external accessory detection inputs used for monitoring
voltage levels in these inputs. They are routed internally from the miscellaneous.
The monitored RF functions are:
• Power amplifier temperature (GRFTEMP)
• VCXO Temperature (WTx_TEMP)
PATEMP input is used to measure temperature of the TEX and HLGA.
A/D values can be monitored through the ‘ADC Reading’ window in Phoenix.
ZOCUS
The ZOCUS device N201 (National LM3819) is a calibrated current sensor, used by energy
management software to determine the current consumption in the mobile phone.
Current is sensed across a “zero-ohm” PWB track resistor (actual trace resistance is
~3.3mΩ) using a high gain and extremely low offset comparator. The measured current
is converted to a pulse width modulation (PWM) signal with the duty cycle representing
both the magnitude and direction of current. The PWM signal is converted to digital data
that can be read by the phone via the CBUS interface.
ZOCUS reads the average current over a period of approximately 1 second.