Lcd Interface; Keyboard - Nokia RM-512 Service Manual

Signal From
name
VCXOTEMP RF-IC
PATEMP RF-IC

LCD interface

The display is controlled by phone processor UPP.
The LCD module is connected to the PWB by a 24-pin Board-to-Board connector.

Keyboard

A 5 X 4 matrix keyboad consists of 21 keys, one 10-channel integrated passive filter arrays with downstream
ESD protection of >8KV connect the matrix keyboard to UPP.
Page 6 –14
To Parameter
Litepl Input
us voltage
range
Input
resistance
Resolution
Litepl Voltage at
us -20oC
Figure 115 Keyboard schematics
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
RM-512; RM-513; RM-514; RM-515; RM-543
Min Typ Max
0 2.7
900 6000
10
1.57
System Module
Unit Function
V
Ohm
bits
V Usage depends of the
RF design
Issue 2