DVD Recorder User Manual

14
Description
The HSDL-3220, a low-cost and small form factor infrared
transceiver, 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 specication from
9.6 kbit/s to 4.0 Mbit/s, and supports HP-SIR and TV Re-
mote modes. The design of the HSDL-3220 also includes
the following unique features:
• Low passive component count.
• Shutdown mode for low power consumption re-
quirement.
• Interface to input/output logic circuits as low as 1.8V
Selection of Resistor R1
Resistor R1 should be selected to provide the appropri-
ate peak pulse LED current over dierent ranges of Vcc
as shown in the table below.
Interface to Recommended I/O chips
The HSDL-3220’s TXD data input is buffered to allow
for CMOS drive levels. No peaking circuit or capacitor
is required. Data rate from 9.6 kbit/s up to 4.0 Mbit/s is
available at the RXD pin.
The block diagram below shows how the IR port ts into
a mobile phone and PDA platform.
TRANSCEIVER
MOD/
DE-MODULATOR
SPEAKER
RF INTERFACE
AUDIO INTERFACE
USER INTERFACE
MICROCONTROLLER
DSP CORE
ASIC
CONTROLLER
IR
MICROPHONE
HSDL-3220
Figure 17. Mobile phone platform.
Minimum Peak Pulse
Recommended R1 Vcc Intensity LED Current
5.6Ω 3.0 V 45 mW/sr 150 mA
Appendix C: General Application Guide for the HSDL-3220