HSDL-7000 Datasheet, PDF (1/6 Pages) Agilent(Hewlett-Packard) – IR 3/16 Encode/Decode IC

HSDL-7000
IR 3/16 Encode/Decode IC
Data Sheet
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 –
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 transceiver module.
The IR Decode block is driven by the negative edge
triggered IR_RCV signal from the infrared transceiver
module. After this signal is demodulated and
stretched, it drives the RCV signal to the UART.
Features
• Compliant with IrDA physical layer specs
• Interfaces with IrDA compliant SIR (115Kbps)
transceiver
• 1 Micron CMOS gate array
• Used in conjunction with standard 16550 UART
Applications
Interfaces with SIR infrared transceivers to perform:
• Serial half-duplex data transfer between:
Notebook computers
Subnotebooks
Desktops PCs
PDAs
Printers
Other peripheral devices
• Telecom applications in:
Modems
Fax machines
Pagers
Phones
• Industrial applications in:
Data collection devices
• Medical applications in:
Patient and pharmaceutical data collection
Schematic
HSDL-7000
TXD
IR ENCODE
IR_TXD
RCV
NRST
IR DECODE
IR_RCV
Pin Out
16XCLK ₁
TXD
2
RCV
3
GND
4
7000
YYWW
8
V_CC
7 ^IR_TXD
6 ^IR_RCV
5
NRST