HSDL-3602 datasheet(21/27 Pages) LITEON

21 / 27 page

Appendix C: General Application Guide for the HSDL-3602

Infrared IrDA® Compliant 4 Mb/s Transceiver

Description

The HSDL-3602 wide voltage operating range infrared

transceiver is a low-cost and small form factor that is

designed to address the mobile computing market such

as notebooks, printers and LAN access as well as small

embedded mobile products such as digital cameras,

cellular phones, and PDAs. It is fully compliant 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 Management (full, 2/3, 1/3

power).

• Shutdown mode for low power consumption require-

ment.

• Single-receive output for all data rates.

Adjustable Optical Power Management

The HSDL-3602 transmitter offers user-adjustable opti-

cal 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

following Table. The power levels are setup to corre-

spond nominally to maximum, two-third, and one-third

of the transmission distance. This unique feature allows

lower optical power to be transmitted at shorter link

distances to reduce power consumption.

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

contact Agilent Application group for further details.

Static: Pre-program the ROM BIOS of the system (e.g.

notebook PC, digital camera, cell phones, or PDA) to

allow the end user to select the desired optical power

during the system setup stage.

MODE

MODE 1

Transmitter

Shutdown

Full Power

2/3 Power

1/3 Power

Resistor R1 should be selected to provide the appropri-

ate 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 3V Endec and Super

I/Os, and the SMC Super I/O chips.

(A) National Semiconductor Super I/O and Infrared

Controller

For National Semiconductor Super I/O and Infrared

Controller chips, IR link can be realized with the

following connections:

• Connect IRTX of the National Super I/O or IR Control-

ler to TXD (pin 9) of the HSDL-3602.

• Connect IRRX1 of the National Super I/O or IR Control-

ler to RXD (pin 8) of the HSDL-3602.

• Connect IRSL0 of the National Super I/O or IR Control-

ler to FIR_SEL (pin 3) of the HSDL-3602.

Please refer to the table below for the IR pin assign-

ments for the National Super I/O and IR Controllers that

support IrDA 1.1 up to 4 Mb/s:

Selection of Resistor R1

HSDL-3602 Datenblatt(PDF) 21 Page - Lite-On Technology Corporation

HSDL-3602 Datenblatt(HTML) 21 Page - Lite-On Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datenblatt Download

Link URL