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HSDL3602 Datasheet(PDF) 18 Page - Agilent(Hewlett-Packard)

Part # HSDL3602
Description  Data 1.4 Compliant 4 Mb/s 3V Infrared Transceiver
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Manufacturer  HP [Agilent(Hewlett-Packard)]
Direct Link  http://www.home.agilent.com
Logo HP - Agilent(Hewlett-Packard)

HSDL3602 Datasheet(HTML) 18 Page - Agilent(Hewlett-Packard)

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17
Appendix B: General Application
Guide for the HSDL-3602 Infrared
IrDA® Compliant 4 Mb/s Transceiver
Description
The HSDL-3602 wide voltage
operating range infrared trans-
ceiver is a low-cost and small
form factor that is designed to
address the mobile computing
market such as notebooks, print-
ers and LAN access as well as
small embedded mobile products
such as digital cameras, cellular
phones, and PDAs. It is fully com-
pliant to IrDA 1.1 specification
up to 4 Mb/s, and supports HP-
SIR, Sharp ASK, and TV Remote
modes. The design of the HSDL-
3602 also includes the following
unique features:
• Low passive component count.
• Adjustable Optical Power Man-
agement (full, 2/3, 1/3 power).
• Shutdown mode for low power
consumption requirement.
• Single-receive output for all
data rates.
Adjustable Optical Power Management
The HSDL-3602 transmitter of-
fers user-adjustable optical power
levels. The use of two logic-level
mode-select input pins, MODE 0
and MODE 1, offers shutdown
mode as well as three transmit
power levels as shown in the fol-
lowing Table. The power levels
are setup to correspond nomi-
nally to maximum, two-third, and
one-third of the transmission
distance. This unique feature
allows lower optical power to be
transmitted at shorter link dis-
tances to reduce power consump-
tion.
MODE
MODE 1
Transmitter
1
0
Shutdown
0
0
Full Power
0
1
2/3 Power
1
1
1/3 Power
Selection of Resistor R1
Resistor R1 should be selected to
provide the appropriate peak
pulse LED current over different
ranges of Vcc. The recommended
R1 for the voltage range of 2.7 V
to 3.3 V is 2.2
Ω while for 3.0 V
to 3.6 V is 2.7
Ω. The HSDL-3602
typically provides 250 mW/sr of
intensity at the recommended
minimum peak pulse LED current
of 400 mA.
Interface to Recommended I/O chips
The HSDL-3602’s TXD data input
is buffered to allow for CMOS
drive levels. No peaking circuit or
capacitor is required.
Data rate from 9.6 kb/s up to 4
Mb/s is available at the RXD pin.
The FIR_SEL pin selects the data
rate that is receivable through
RXD. Data rates up to 115.2 kb/s
can be received if FIR_SEL is set
to logic low. Data rates up to 4
Mb/s can be received if FIR_SEL
is set to logic high. Software
driver is necessary to program
the FIR_SEL to low or high at a
given data rate.
4 Mb/s IR link distance of greater
than 1.5 meters have been
demonstrated using typical
HSDL-3602 units with National
Semiconductor’s PC87109 3 V
Endec and Super I/Os, and the
SMC Super I/O chips.
There are 2 basic means to
adjust the optical power of the
HSDL-3602:
Dynamic: This implementation
enables the transceiver pair to
adjust their transmitter power
according to the link distance.
However, this requires the IrDA
protocol stack (mainly the IrLAP
layer) to be modified. Please con-
tact Agilent Application group for
further details.
Static: Pre-program the ROM
BIOS of the system (e.g. note-
book PC, digital camera, cell
phones, or PDA) to allow the end
user to select the desired optical
power during the system setup
stage.


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