Fig 13 Ir Module - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation
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 receiving functions by transforming signals transmit-
ted in infrared light from and to electrical data pulses running in two wire asynchronous
databus. IR is located at the left bottom corner of the product.
Signal Parameter
IRONX IR-module on/off
FBUS_RX IR receive no pulse
IR receive pulse
FBUS_TX IR transmit pulse
IR transmit no pulse
The module is activated with an IRONX signal by the MAD, which supplies power to the
module. The IR datalines are connected to the MAD accessory interface AccIf via FBUS.
The AccIf in MAD performs pulse encoding and shaping for transmitted data and detec-
tion 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 (InfraRed Data Association), which is
based on the HP SIR (Hewlett-Packard`s Serial InfraRed) concept. Maximum transmission
distance is set to 60cm.
In IR transmission a light pulse corresponds to 0-bit and a "dark pulse" corresponds to 1-
bit.
IR TX
UART TX
startbit
The FBUS cannot be used for external accessory communication, when the infrared mode
Issue 1 06/00
Min Typ
0.7 x VBB
0
0.7 x VBB
0
0.7 x VBB
0
constant pulse
0 1 0
1
Figure 12: IR Transmission
ãNokia Mobile Phones Ltd.
Max Unit Notes
VBB V lout@2mA, IR is at
off state
0.3 x VBB IR, is at on state
VBB V
0.3 x VBB
VBB V lout@2mA
0.3 x VBB
0 1 1 0
NSB-7
UI Module
stopbit
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