rpm872 photo link module rev.b 1/6 irda infrared communication module rpm872 rpm872 is an infrared communication module for irda ver. 1.2 (low power). the infr ared led, pin photo diode, and waveform shaping lsi are all integrated into one single pack age. this module is designed fo r low power consumption. the very small package makes it a perfect fit for mobile devices. z features 1) applied to irda ver. 1.2. (low power) 2) designed for low power cons umption at waiting mode (75 a). 3) low operating voltage v cc =2.0v to 3.6v vio=1.5v to 3.6v vled=2.6v to 5.5v 4) small package. 5) power down function. z applications cellular phones, pda, digital still camera, h andy terminals, and other portable equipments. z absolute maximum ratings (ta=25 c) power dissipation supply voltage operating temperature storage temperature parameter symbol limits unit v cc 7.0 ?20 to +85 ?30 to +100 v mw 100 topr tstg pd ?c ?c z recommended operating conditions (ta = 25 c) supply voltage parameter symbol min. typ. max. unit v cc 3.0 v 2.0 3.6 vleda vio 3.0 v 2.6 5.5 3.0 v 1.5 v cc
rpm872 photo link module rev.b 2/6 z block diagram and application circuit amp 1 8765432 amp amp power down v cc vio v cc v cc (3pin) and vleda(8pin) can be used on either common power source or different one. gnd c1 gnd vio gnd pwdown rxd txd leda pwdown rxd txd (ledv cc )
rpm872 photo link module rev.b 3/6 z terminal description function pin no 1, 4 gnd gnd vio supply voltage for i/o pins (pwdown, rxd, txd) 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 mode l : operating mode 2 vio pwdown rxd txd leda 3 5 6 7 8 v cc vio vio 600k led vio vio pwdown 300k v cc supply voltage for transceiver circuits. for preventing from infection, connect a capacitor between v cc (3pin) and gnd(4pin). receiving data output terminal cmos logic level output when pwdown (5pin) = h, the rxd output will be pulled up to vio 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 48s. led anode terminal other power source can be used difference between ledv cc and v cc . this can be connected to battery kinds of unregulated voltage source by internal constant current driver. terminal circuit
rpm872 photo link module rev.b 4/6 z electrical characteristics (unless otherwise noted, v cc =3v, vleda=3v, vio=3v, ta=25 c) pwdown input high voltage pwdown input high current pwdown input low voltage pwdown input low current consumption current 1 parameter symbol min. typ. max. unit conditions i cc 1 i cc 2 vpdh vpdl ipdh ipdl 75 a vpwdown = 0v. at no input light vpwdown = vio. at no input light pwdown = vio [v] vio = 1.8 to 3.6 [v] vio = 1.5 to 1.8 [v] vio = 1.8 to 3.6 [v] vio = 1.5 to 1.8 [v] ? 0.01 ? 0 ? 2.4 ? ? 2/3?vio 1.2 2/3?vio 1.2 1/3?vio vio?1.2 1/3?vio vio?1.2 99 a 0.2 kbps 115.2 v v vio vtxh vtxl itxh itxl ileda vrxh vrxl trr tfr trt twrxd pwdown = 0 [v] txd = vio [v] txd = 0 [v] 0 ?1.0 0 2.5 ?1.0 ? 0 ? ? 1.5 ? vio?0.4 0 ?1.0 ? ? 5 0 30.5 ? ? 35 35 2.3 100 a 1.0 a 1.0 v v a a ma v v ns ns s s vio 10 1.0 ? vio 0.4 ? ? 4.2 200 irxh = ?200a irxl = 200a c l = 15pf c l = 15pf c l = 15pf, 2.4 to 115.2kbps vio = 1.8 to 3.6 [v] vio = 1.5 to 1.8 [v] vio = 1.8 to 3.6 [v] vio = 1.5 to 1.8 [v] consumption current 2 transmission rate txd input high voltage txd input high current txd input low voltage txd input low current led anode current rxd output high voltage rxd output low voltage rxd output rise time rxd output fall time rxd output pulse width receiver latency time z optical characteristics (unless otherwise noted, v cc =3v, vleda=3v, vio=3v, ta=25 c) 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. parameter symbol min. typ. max. unit conditions p ie1 l / 2 d / 2 tledmax tr / tf tj eemax 870 nm ?15? l 15? ?15deg l +15deg txd=vio 10% to 90% 850 10 4.0 ? 18 ? ? 900 mw / sr 26 twled txd=1.63s pulse input 1.63 1.42 s 2.02 mw / cm 2 deg ns deg s 30 100 ? ? ? ? ? 48 ?40 500 15 16 % 25 ns 40 ? ? 120 peak wave length intensity 1 half-angle rise time / fall time optical over shoot optical pulse width edge jitter maximum irradiance eemin ?15deg l +15deg w / cm 2 ? ? 6.8 minimum irradiance input half-angular maximum emitting time
rpm872 photo link module rev.b 5/6 z timing chart more than 48 s approximately 48 s less than 2.3 s more than 2.3 s approximately 2.3 s approximately 2.3 s pull up to vio at approximately 300k? (emitting side) (detecting side) txd (7pin) internal led (light output) light input rxd (6pin) pwdown (5pin) less than 48 s (emitting) (emitting) (emitting) z 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
rpm872 photo link module rev.b 6/6 z notes 1) vleda(8pin), v cc (3pin) and vio(2pin) ? other power source can be us ed difference between vleda and v cc and vio. (vio < v cc +0.3v) 2) caution in designing board lay-out to get maximum potential from rpm872, pl ease keep in mind following instruction. ? the line of rxd (6pin) should be connected at backside via through hole clos e to rpm872 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 rpm872. ? 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 0.3v) except transmitting data (for < 90 s. on duty < 20%). ? powerdown current might increase if exposed by strong light (ex. dire ct sunlight) at powerdown mode. ? please use by the signal format which is specified by irda ver1.2 (low power). 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) eye safe ? iec825-1 (en60825-1) class 1 eye safe. z external dimensions (unit : mm) rslp8 r1.0 r1.1 0.78 0.76 0.37 ?.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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