rpm871 photo link module rev.b 1/7 irda infrared communication module rpm871 rpm871 is an infrared communication module for irda ver. 1.2 (low power). the infrared led, pin photo diode, lsi are all integrated into a single package. th is module is designed with power down function and low current consumption at stand-by mode. the ultra small package make s it a perfect fit for mobile devices. z features 1) applied to irda version 1.2. (low power) 2) designed for low power consum ption at waiting mode (typ.73 a). 3) suitable for sets driven by battery due to power down control function. 4) power supply voltage range : 2.6v to 3.6v 5) constant led load resistance can change transmission distance. (approx. 20 to 60cm) z applications cellular phones, pdas, etc. z absolute maximum ratings (ta = 25 c) parameter symbol limits unit power supply voltage v cc ?0.3 to +7.0 ?20 to +85 ?30 to +100 v ma mw 200 ?2 150 ?1 operating temperature range storage temperature range led peak current power dissipation topr tstg i fp pd c c ?1 70mm70mm, t=1.6mm, glass epoxy mounting. derating : 2mw/c for operation above ta=25c ?2 led peak current<90s. on duty<20% z recommended operating conditions (ta = 25 c) parameter symbol min. typ. max. unit power supply voltage v cc 2.8 v 2.6 3.6 v leda 2.8 v 2.6 5.5
rpm871 photo link module rev.b 2/7 z block diagram and application circuit amp 1 8765432 amp amp power down led driver v cc v cc gnd c1 r1 gnd nc gnd pwdown rxd txd leda pwdown rxd txd (ledv cc ) v cc (3pin) and vleda (8pin) can be used on either common power source or different one.
rpm871 photo link module rev.b 3/7 z terminal description terminal circuit function pin no 1, 4 gnd gnd this terminal must be left open. power-down control terminal cmos logic level input when input is h, it will stop the receiving circuit, pin-pd current and transmitting led operation. h : powerdown l : operation receiving data output terminal cmos logic level output when pwdown (5pin)=h, the rxd output will be pulled up to v cc at approximately 300k?. transmitting data input terminal h : led (pwdown=l) cmos logic level input holding txd="h" status, led will be turn off approximately 45s. led anode terminal other power source can be used difference between ledv cc and v cc . led current depends on led load resistance value. 2nc pwdown rxd txd leda 3 5 6 7 8 v cc v cc for preventing from infection, connect a capacitor between v cc (3pin) and gnd (4pin). v cc v cc 200k led v cc v cc 300k pwdown
rpm871 photo link module rev.b 4/7 z electrical characteristics (unless otherwise noted, v cc =2.8v, vledv cc =2.8v, ta = 25 c) parameter symbol min. typ. max. unit conditions consumption current1 i cc 1 i cc 2 vpdh vpdl ipdh ipdl 73 a waiting mode at no input light pwdown pin high at no input light pwdown=v cc [v] consumption current2 transmission rate pwdown input high voltage pwdown input low voltage pwdown input high current pwdown input low current txd input high voltage txd input low voltage rxd output high voltage rxd output rise time rxd output fall time rxd output pulse width receiver latency time rxd output low voltage txd input high current txd input low current led anode current ? 0.01 ? ? ? 2.4 ? ? v cc ?0.55 99 a 0.2 kbps 115.2 v v ? 0.55 vtxh vtxl itxh itxl ileda vrxh vrxl trr tfr trt twrxd pwdown=0 [v] txd=v cc [v] txd=0 [v] r1=7.5 [?] 0 ?1.0 v cc ?0.55 ? 7 ?1.0 ? ? ? ? 1.5 ? v cc ?0.5 0 ?1.0 ? ? 14 0 144 ? ? 70 30 2.3 100 a 1.0 a 1.0 v v a a ma v v ns ns s s ? 0.55 28 1.0 ? ? 0.4 ? ? 3.6 300 irxh=?50a irxl=200a c l =15pf c l =15pf c l =15pf, 2.4 to 115.2kbps z optical characteristics (unless otherwise noted, v cc =2.8v, vledv cc =2.8v, ta = 25 c) parameter symbol min. typ. max. unit conditions peak wave length 1. this product is not designed for protection against radioactive rays. 2. this product dose not include laser transmitter. 3. this product includes one pin photo diode. 4. this product dose not include optical load. p ie1 l/2 d/2 tledmax tr/tf tj eemax 870 nm ?15? l 15 r1=7.5 [?] ?15deg l +15deg txd=v cc 10% to 90% intensity1 half-angle rise time / fall time optical over shoot edge jitter maximum irradiance input half-angular maximum emitting time 850 36 14.4 ? 18 ? ? 900 mw/sr 93.6 mw/cm 2 deg ns deg s 30 100 ?? ? ? ? 45 ?40 500 15 10 % 25 ns 40 ? eemin ?15deg l +15deg minimum irradiance w/cm 2 ? ? 6.8 ? 96
rpm871 photo link module rev.b 5/7 z timing chart less than 45s (emitting) more than 45s approximately 45s less than 2.3s more than 2.3s approximately 2.3s approximately 2.3s pull up to v cc at approximately 300k? (emitting) (emitting) (emitting side) (detecting side) txd (7pin) internal led (light output) light input rxd (6pin) pwdown (5pin) z attached components recommended values part symbol c1 recommended value notice 1f, tantalum or ceramic ex.) tcfga1a105m8r (rohm) bigger capacitance is recommended with much noise from power supply r1 7.5?5%, 1/4w (vledv cc =2.8v) more than 60cm distance, more than 4[w/cm 2 ] at detecting side. (vs ver1.0) more than 46cm distance, more than 6.8[w/cm 2 ] at detecting side. (vs rpm871) in case of using r1 with different conditi on from the above, formula is as follows : led resistance value : r1[ ? ], led average consumption current : iled[ma], supply voltage : vledv cc [v], link distance : d[cm] (including led?s distribution within 15deg) r1=t (vledv cc ? 1.45) / d 2 ? 3.5 [ ? ] iled=duty (vledvcc ? 1.36) / (r1 + 2.5) [a] duty : led duty at emitting t : 17300 (vs. rpm871), 29400 (vs. ver1.0) ? please set up to be iled / duty < 200[ma] (duty < 20%)
rpm871 photo link module rev.b 6/7 z notes 1) ledv cc (8pin) and v cc (3pin) ? other power source can be used difference between ledv cc and v cc . 2) caution in designing board lay-out to get maximum potential from rpm871, pl ease keep in mind following instruction. ? the line of rxd (6pin) should be connec ted at backside via through hole close to rpm871 pin lead. better not to be close to photo diode side (1pin). ? this is to minimize feedback supplied to photo diode from rxd. ? as for c1 between 3-4 pin should be placed close to rpm871. ? better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also away from the parts which generates noise, such as dc / dc converter. 3) others ? please be sure to set up the txd (7pin) input to be ?l? (under 0.55v) except transmitting data (for < 90 sec. on duty < 20%). ? power down current might increase if exposed by strong light (ex. dire ct sunlight) at power down mode. ? please use by the signal format which is specified by irda ver1.2 (2.4k to 115.2kbps). there might be on error if used by different signal format. ? dust or dirt on lens portion may affect the c haracteristics, so pay sufficient attention. 4) led current derating and ambient temperature the relation between led peak current and maxi mum ambient temperature is shown below. we recommend you to use within the range as indicated in below. a) when glass-epoxy board (70 70 1.6mm) mounted. ? 200 2040608010 ambient temperature : ta (c) 0 maximum led pack current : iledp (ma) 50 100 150 200 250 0 duty=10% duty=20% b) rpm871 ? 200 2040608010 ambient temperature : ta (c) 0 maximum led pack current : iledp (ma) 50 100 150 200 250 0 duty=10% duty=20%
rpm871 photo link module rev.b 7/7 z external dimensions (unit : mm) rslp8 r1.0 r1.1 0.78 0.76 0.37 0.10 0.95 3.8 1 1 8 led pin pd 2 1 2.72 0.8 7.6 5.6 p0.95 7=6.65 2.49
appendix appendix1-rev1.1 the products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document are no antiradiation design. about export control order in japan products described herein are the objects of controlled goods in annex 1 (item 16) of export trade control order in japan. in case of export from japan, please confirm if it applies to "objective" criteria or an "informed" (by miti clause) on the basis of "catch all controls for non-proliferation of weapons of mass destruction.
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