The HSDL-3602 is a low profile infrared transceiver MOD-ULE that provides an interface between logic and infrared signals for an over-the-air, serial, half-duplex infrared data link. The MOD-ULE is compliant with the IrDA Data Physical Layer Specification 1.4 system evapotranspiration and IEC825-1 eye safety standards. The HSDL-3602 contains a high speed and high Efficiency 870nm LED, silicon PIN diode, and an integrat-edit circuit. The IC contains an LED driver and a receiver providing a single output (RXD) for all data rates, supporting porting.

The HSDL-3602 wide voltage operating range infrared transceiver is a low cost and small form factor that is designed to address mobile computing markets such as notebooks, printers and LAN access, as well as small embedded mobile products such as digital cameras, cellular phones and PDA. It is fully compliant with the IrDA 1.1 specification with a maximum of 4 MB/sec and supports HP-SIR, Sharp ASK and TV Remote Mode. The design of the HSDL-3602 also includes the following features:

Low passive component count.

Dimmable power management (full, 2/3, 1/3 power).

Shutdown mode, low power consumption requires a replacement.

A single output receives all data transfer rates.

Dimmable Power Management

The HSDL-3602 transmitter offers user adjustable opti-calibrated power levels. Mode select input pins using two logic levels, Mode 0 and Mode 1, provide shutdown modes as shown, and three transmit power levels in the table below. Set the power level to corre- have response nominally at maximum, two-thirds, and one-third the transmission distance. This unique feature allows lower optical power to be transmitted over shorter link distances to reduce power consumption. There are 2 basic means of adjusting the optical power of the HSDL-3602: Dynamic: This implementation enables a transceiver pair to adjust its transmit power according to the link distance. However, this requires modification in the IrDA stack (mainly the IrLAP layer). Please contact Agilent Applications Group for further details. Static: The BIOS pre-programmed in the ROM of the system (eg laptop, digital camera, cell phone or PDA) to allow the end user to select the desired optical power at the stage of system setup.

Choose resistor R1

Resistor R1 should be chosen to provide different ranges on the Vcc of the batch peak pulse current LED. The recommended R13.3V range is 2.2Ω for a voltage range of 2.7V, and 2.7Ω for 3.0V to 3.6V. The HSDL-3602 typically provides an LED intensity of 250 mW/SR at a recommended minimum peak pulse current of 400 mA.

The interface recommends the I/O chip's HSDL-3602's TXD data input buffer to allow for CMOS drive levels. No peaking circuits or capacitors required. Data rates from 9.6 kb/s up to 4Mb/s are available on the RXD pin. The data rate selected by the FIR_SEL pin is charged 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 4Mb/s can be received if FIR_SEL is set to logic high. A software driver is necessary to program FIR_SEL low or high at a given data rate. Larger 4 Mb/s infrared transmission distances of over 1.5 meters are demonstrated using the typical HSDL-3602 unit with National Semiconductor's PC87109 3V ENDEC and Super I/O, as well as the SMC Super I/O chip.