User Guide

RH-26
2 - System Module CCS Technical Documentation
Page 30 ©Nokia Corporation Issue 1 02/04
LCD
A passive matrix colour STN display having 128 x 128 8 bpp (bits per pixel) is used in RH-
26. The LCD display is connected to the transceiver PWB by a board-to-board connector.
Table 21: LCD characteristics
IR module
The IR interface is designed into the UPP. The IR link supports speeds from 9600 bit/s to
1.152 MBit/s up to distance of 100 cm (75 cm with 1.152Mbit/s). Transmission over the
IR if half-duplex.
The length of the transmitted IR pulse depends on the speed of the transmission. When
230.4 kbit/s or less is used as a transmission speed, pulse width is maximum1.63µs. If
transmission speed is set to 1.152Mbit/s, the nominal pulse width is 154ns.
Backup battery
A backup battery is used when the main battery is either removed or discharged. The
backup battery is used for keeping real-time clock running for a minimum of 10 minutes.
The rechargeable backup battery is connected between UEMK VBACK and GND. In UEMK,
the backup battery charging high limit is set to 3.2V. The cut–off limit voltage (V
BUCoff– ) for the backup battery is 2.0V. Charging is controlled by the MCU by writing
into UEMK register.
Cell capacitor SMD “battery” type is used. The nominal capacity of the battery is 0.01
mAh.
Table 22: Backup battery circuitry
Technology CSTN
Display format 128 columns x 128 rows
Weight estimation 7 g
Illumination Mode
RAM bit data
Transreflective
"0000"…OFF (minimum voltages) Black
Numbers of colours 256 (8 bits per pixel, 3 x Red, 3 x Green & 2 x Blue)
Colour filter arrangement Stripe (RGB)
Pixel height to width ratio 1:1
Main viewing direction 6 o’clock
Parameter
Test conditions
Symbol Min Typ Max Unit
Back-up battery voltage VBACK 2.43 3.3 V