H
IR 3/16 Encode/Decode IC
Technical Data
HSDL-7000
Features
鈥?Compliant with IrDA
Physical Layer Specs
鈥?Interfaces with IrDA
Compliant HSDL-1000 IR
Transceiver
鈥?1 Micron CMOS Gate Array
鈥?Used in Conjunction with
Standard 16550 UART
鈥?Pin Compatible with
PLX-1000
Description
The HSDL-7000 performs the
modulation/demodulation
function used to both encode and
decode the electrical pulses from
the IR transceiver. These pulses
are then sent to a standard UART
which has a BAUDOUT signal
available externally. This signal is
16 times the selected baud rate.
In applications where the
16XCLK is not available, an
external means of generating the
16XCLK must be designed.
The HSDL-7000 is comprised of
two state machines 鈥?the serial IR
encode and the serial IR decode
blocks. Each of these blocks
derives their timing from the
16XCLK input signal from the
UART. The Encode block is
driven by the negative edge
triggered TXD signal from the
UART. This initiates the modula-
tion state machine resulting in
the 3/16 modulated IR_TXD
signal which drives the IR trans-
ceiver module, HSDL-1000. The
IR Decode block is driven by the
negative edge triggered IR_RCV
signal from the HSDL-1000. After
this signal is demodulated and
stretched, it drives the RCV signal
to the UART.
Schematic
HSDL-7000
TXD
IR ENCODE
IR_TXD
RCV
IR DECODE
IR_RCV
NRST
Applications
Interfaces with
HSDL-1000 to perform:
鈥?Serial Half-Duplex Data
Transfer Between:
Notebook Computers
Subnotebooks
Desktops PCs
PDAs
Printers
Other Peripheral Devices
鈥?Telecom Applications in:
Modems
Fax Machines
Pagers
Phones
鈥?Industrial Applications in:
Data Collection Devices
鈥?Medical Applications in:
Patient and Pharmaceutical
Data Collection
Pin Out
16XCLK
TXD
RCV
GND
1
2
3
4
8
7
6
5
V
CC
IR_TXD
IR_RCV
NRST
HP 7000
YYWW
5964-9278E
4-43
1
2
3
4
5
