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HSDL3208 Datasheet(PDF) 13 Page - Agilent(Hewlett-Packard) |
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HSDL3208 Datasheet(HTML) 13 Page - Agilent(Hewlett-Packard) |
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13 / 18 page  13 Appendix C : General Application Guide for the HSDL-3208 Infrared IrDA® Compliant 115.2 kb/s Transceiver Description The HSDL-3208 is an ultra-small low-cost infrared transceiver module that provides the interface between logic and infrared (IR) signals for through air, serial, half-duplex IR data link. The device 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 Minimum Peak Pulse Recommended R1 VCC Intensity LED Current 2.7 Ω 3.3 V 9 mW/Sr 50 mA Figure 19: IR layout in mobile phone platform. 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-3208 also includes the following unique features: • Low passive component count • Shutdown mode for low power consumption requirement Selection of Resistor R1 Resistor R1 should be selected to provide the appropriate peak pulse LED current over different ranges of VCC as shown in the table below. TRANSCEIVER MOD/ DE-MODULATOR SPEAKER RF INTERFACE AUDIO INTERFACE USER INTERFACE MICROCONTROLLER DSP CORE ASIC CONTROLLER IR MICROPHONE HSDL-3208 Interface to Recommended I/O Chips The HSDL-3208’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. The diagram below shows how the IR port fits into the mobile phone platform and PDA platform. |
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