User Guide

NSM–3/3D
UI Module
PAMS Technical Documentation
Page 17
Issue 3 11/2000
 Nokia Mobile Phones Ltd.
IR Module
An infrared transceiver module is designed to substitute an electrical
cable between the phone and a PC. The infrared transceiver module is a
stand alone component capable to perform infrared transmitting and re-
ceiving functions by transforming signals transmitted in infrared light from
and to electrical data pulses running in two wire asynchronous databus.
IR is located left bottom corner of the product.
Signal Parameter Min Typ Max Unit Notes
IRONX IR–module on/off 0.7 x VBB VBB V Iout@2mA, IR is at off
state
0 0.3 x VBB IR, is at on state
FBUS_RX
IR receive no pulse 0.7 x VBB VBB
IR receive pulse 0 0.3 x VBB
FBUS_TX
IR transmit pulse 0.7 x VBB VBB Iout@2mA
IR transmit no pulse 0 0.3 x VBB
The module is activated with an IRONX signal by the MAD, which sup-
plies power to the module. The IR datalines are connected to the MAD
accessory interface AccIf via FBUS. The AccIf in MAD performs pulse en-
coding and shaping for transmitted data and detection and decoding for
received data pulses.
The data is transferred over the IR link using serial data at speeds 9.6,
19.2, 38.4, 57.6 or 115.2 kbits/s, which leads to maximum throughput of
92.160 kbits/s. The IR module used does not comply with the IrDA 1.0
specification (Infra Red Data Association), which is based on the HP SIR
(Hewlett–Packard‘s Serial Infra Red) concept. Maximum transmission dis-
tance is set to 60cm.
In IR transmission a light pulse corresponds to 0–bit and a ”dark pulse”
corresponds to 1–bit.
UART TX
IR TX
startbit stopbit1 0100110
constant pulse