Touch Screen Controller - Nokia RM-506 Service Manual

RM-505; RM-506
System Module and User Interface
The proximity sensor is located on the upper flex assembly.
Features
The Proximity sensor has following features:
• 2.8V
• 1.8V compatible IOs
• Low power consumption
• 20 mm working area
• Factory calibrated, no calibration required in care
• Pb free/RoHS compliancy
The proximity sensor works by sending out a beam of IR light, and then computing the distance to any nearby
objects from characteristics of the returned (reflected) signal. When the object is under 20 mm distance
detection will happen and output will go to high state (1.8V).
Reference design
Pin
1 Anode LED
2 GND
3 OUT
4 TEST
5 VCC
6 Rprog

Touch screen controller

TSC2004 (N500 on Tilt FPC) is a touch screen controller for resistive touch pads. It contains a complete
ultralow-power, 12-bit, analog-to-digital (A/D) resistive touch screen converter, including drivers and control
logic to measure touch pressure.
It also has embedded pre-processing function to reduce the output bus load. The host interface in TSC2004
is I2C.
Issue 1
Figure 74 Proximity sensor reference design and measurement points
Signal name
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
Description
No connection
Ground
Sensor output (0V or 1.8V Push-Pull)
No connection
Supply voltage (2.4V - 2.8V)
Program resistor
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