User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–10
Signal name Pin Notes
UIF5 10 Line for keyboard read and LCD–controller
data/instruction register selection
UIF6 11 LCD–controller enable strobe
MIC_ENA 12 Microphone bias enable
COL(0:3) 13–16 Lines for keyboard write
CALL_LED 17 Call led enable
MICP 18 Microphone (positive node)
MICN 19 Microphone (negative node)
EARP 20 Earpiece (negative node)
EARN 21 Earpiece (positive node)
BUZZER 22 PWM signal buzzer control
XPWRNON 23 Power key (active low)
VA1 24 Analog supply voltage 4.65V
UIMCLK 25 Clock for UIM data
UIMRESET 26 Reset for UIM
VUIM 27 UIM voltage supply
UIMDATA 28 Serial data for UIM
GND 29 Analog ground. Connected directly to digital
ground on the PCB.
System Connector X100
Signal name pin Notes
GND 1,9 Digital ground.
MIC_JCONN 2 External audio input from accessories or
handsfree microphone. Multiplexed with
junction box connection indication. 16.8k
pull down in HP
AGND 3 Analog ground for accessories.
Connected directly to digital ground on
the PCB.
TDA 4 Transmitted DBUS–data to the accessories
M2BUS 5 Serial bidirectional data and control between
the handphone and accessories.