Appendix C: General Application
Guide for the HSDL-3203 Infrared IrDA®
Compliant 115.2 kb/s Transceiver
Selection of Resistor R1
Resistor R1 should be selected to
provide the appropriate peak
pulse LED current over different
Description
ranges of V as shown in the
CC
The HSDL-3203, a wide voltage
operating range infrared
table below.
transceiver, is a low-cost and
small form factor device that is
designed to address the mobile
computing market such as PDAs,
as well as small embedded mobile
products such as digital cameras
and cellular phones. It is fully
compliant to IrDA 1.4 low power
specification from 9.6 kb/s to
115.2 kb/s, and supports HP-SIR
and TV Remote modes. The
design of the HSDL-3203 also
includes the following unique
features:
Recommended
R1
V
Intensity
Minimum peak
pulse LED current
CC
30 Ω
3 V
3 V
8mW/sr
50 mA
5.6 Ω
34mW/sr 250 mA
Interface to Recommended I/O Chips
The HSDL-3203’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
115.2 kb/s is available at the RXD
pin.
• Low passive component count.
• Shutdown mode for low power
consumption requirement.
The block diagram below shows
ow the IR port fits into a mobile
phone and PDA platform.
SPEAKER
AUDIO INTERFACE
DSP CORE
MICROPHONE
ASIC
CONTROLLER
RF INTERFACE
TRANSCEIVER
MOD/
DE-MODULATOR
IR
MICROCONTROLLER
USER INTERFACE
MOBILE PHONE PLATFORM
HSDL-3203
Figure 19. IR layout in mobile phone platform.
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