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HSDL3602 Datasheet(PDF) 18 Page - Agilent(Hewlett-Packard) |
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HSDL3602 Datasheet(HTML) 18 Page - Agilent(Hewlett-Packard) |
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18 / 25 page  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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