651 communication ics irda wireless communication transceiver ic (supports ver.1.0) rpm851a series the rpm851a series is an ic that supports irda ver 1.0, and is ideal for wireless communications. an infrared led, a pin-photo diode, and a receiver frequency formation lsi are all contained in a single package. also equipped with low power consumption and power down functions making this ic perfect for mobile sets. applications personal computers, pdas, dvcs, digital cameras, printers, cellular phones, phs systems, hand-held terminals, and others features 1) supports irda ver. 1.0 2) low power consumption while standing by for reception (typ. 220 m a). 3) a power-down function is perfect for battery applications. 4) supports a broad power supply voltage range from 2.7v to 5.5v. 5) the package supports mounting on both the upper and side surfaces. 6) integrated shield case (RPM851A-H6) absolute maximum ratings (ta = 25 c) recommended operating conditions (ta = 25 c) series
652 communication ics rpm851a series block diagram
653 communication ics rpm851a series pin descriptions
654 communication ics rpm851a series electrical characteristics (unless otherwise noted, ledv cc = v cc = pinv cc = 3v, ta = 25 c) optical characteristics (unless otherwise noted, ledv cc = v cc = pdv cc = 3v, ta = 25 c)
655 communication ics rpm851a series circuit operation timing charts application example
656 communication ics rpm851a series recommended values (at v cc = 3v)
657 communication ics rpm851a series operation notes ( 1) ledv cc (pin5), v cc (pin122) and pinv cc (pin13) other power source can be used within 0.2 [v] volt- age difference between ledv cc and v cc . v cc and pinv cc should be supplied from the same source. ( 2) caution in designing board lay-out pin1 is radiaton pin from led as well. wider pattern is better. the line of rxdsir (pin10) should be connected at backside via through hole close to rpm851a pin lead. better not to be close to photo diode side (pin13). this is to minimize feedback supplied to photo diode from rxdsir. capacitors for pin12 (v cc ) and pin13 (pinv cc ) should be placed close to rpm851a. better to be placed more than 1.0cm in radius from photo diode (pin13) and also away from the parts which generates noise, such as dc / dc converter. digital signal line, such as clock pulse, bus etc, are also away more than 1.0cm in radius from photo diode. as for c1, c2 and, gnd should be close to pin7 and placed close to pins11, 12 and 13 (within 5mm). ( 3) please be sure to set up the txd (pin6) input to be alo (under 0.5 [v]) except transmitting data (for < 90 m s. on duty < 20%). ( 4) powerdown current might increase if exposed by strong light (ex. direct sunlight) at powerdown mode. ( 5) please use by the signal form which is specified by irda ver1.0. there might be on error if used by differ- ent signal form. external dimensions (units: mm)
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