HP HSDL-7000 Datasheet
IR 3/16 Encode/Decode IC
Technical Data
H
HSDL-7000
Features
• Compliant with IrDA
Physical Layer Specs
• Interfaces with IrDA
Compliant HSDL-1000 IR
Transceiver
• 1 Micron CMOS Gate Array
• Used in Conjunction with
Standard 16550 UART
• Pin Compatible with
PLX-1000
Applications
Interfaces with
HSDL-1000 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
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 modulation state machine resulting in
the 3/16 modulated IR_TXD
signal which drives the IR transceiver 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_TXD
RCV IR_RCV
NRST
IR ENCODE
IR DECODE
Pin Out
16XCLK
TXD
RCV
GND
1
2
HP 7000
YYWW
3
4
8
7
6
5
V
CC
IR_TXD
IR_RCV
NRST
5964-9278E
4-43
Pin Description
16XCLK - Positive edge
triggered input clock that is set to
16 times the data transmission
baud rate. The encode and
decode schemes require this
signal. The signal is usually tied
to a UART’s BAUDOUT signal.
TXD - Negative edge triggered
input signal; usually tied to a
UART’s SOUT signal (serial data
to be transmitted).
Package Dimensions
6.65 (0.26)
MAX.
8
RCV - Output signal which is
usually tied to a UART’s SIN
signal (received serial data).
GND - Chip ground.
NRST - Active low signal used to
reset the decode state machine.
This signal can be tied to POR
(Power on reset) or VCC. This
signal can also be used to disable
any data reception.
1.05
(0.041)
5
IR_RCV - A 3/16th pulse width
input signal from the HSDL-1000.
The signal is a demodulated
(pulse stretched) to generate the
RCV output signal.
IR_TXD - This signal is the
modulated 3/16ths TXD signal
which is input to the HSDL-1000.
VCC - Power.
0.10
(0.004)
SCALE 5
1
1.55
(0.06)
0.40 + 0.10/-0.00
(0.016 + 0.004/-0.000)
NOTE: DIMENSIONS IN MILLIMETERS (INCHES).
1.27
(0.05)
4
1.42
(0.056)
MAX.
0.15 + 0.10/-0.00
(0.006 + 0.004/-0.00)
SEE DETAIL A
0.6 ± 0.2
(0.024 ± 0.008)
DETAIL A, SCALE 20
5.60 (0.22)
7.7 ± 0.3
(0.30 ± 0.012)
4-44
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