After Sales
Technical Documentation
RAE/RAK–1N
PDA Hardware
Page 6 – 45
Original, 08/96
SIRU
Introduction
IrDA transceiver and RS232 buffer are located to this module. Infrared
interface conforms to the Infrared Data Association Serial Interface (SIR)
Physical Layer LInk Specification.
SIRU functions:
– external interface signalling (IrDA and RS232)
Technical Description
Table 26. External Signals and Connections, Inputs
Signal Name Signal description From (1)
VSYS System voltage 3.3V PDAPWRU
TXD External serial data from 9000 SC /
SYSTXD
RSTXD Serial data from PROCU module PROCU
RSENX RS buffer enable PROCU
RSSHDX RS buffer shutdown PROCU
IRSHD IR tranceiver shutdown PROCU
Note 1. SC = System Connector
Table 27. External Signals and Connections, Outputs
Signal Name Signal description To (1)
RXD External serial data to 9000 SC /
SYSRXD
RSRXD Serial data to PDA module PROCU
Note 1. SC = System Connector
Main components
– IR tranceiver
– Temic IrDA SIR integrated transceiver TFDS3000
– Shutdown pin
– RS 232 buffer
– MAX3222CAP transceiver from Maxim
– Two transmitters, two receivers
– Generates EIA/TIA–232 compatible signal levels
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