1/4 status of this document the japanese version of this doc ument is the formal specification. a customer may use this translation version only for a reference to help reading the formal version. if there are any differences in tr anslation version of this document, for mal version takes priority. rev. b structure silicon monolithic integrated circuit product irda sir encoder / decoder type bu92001kn dimensions diagram : figure-2 block diagram : figure-3 function irda controller 1. uart interface 2. irda sir encode / decode function 3. communication rate of 2.4k ? 115.2kbps 4. v dd =2.5 ? 3.5v ( power supply voltage range) note) the ic isn't designed for endurance of the radiation. absolute maximum ratings (ta=25 c) parameter symbol limits units supply voltage vmax 4.5 *1 v input voltage vin -0.3 ? vdd+0.3 v operation temperature topr -25 ? 85 ? storage temperature ts t g -40 ? 100 ? *1) this applies to all pins basis ground pin(9pin). recommended operating conditions parameter symbol min. typ. max units supply voltage vdd 2.5 3.0 3.5 v clock frequency fclk 24.0 27.8 30.0 mhz downloaded from: http:///
2/4 rev. b ~ electrical characteristics (ta=25 c, vdd=3.0v, gnd=0v) parameter symbol min typ max units condition consumption current1 idd1 - 0.1 3.0 ua all the input 0v, output load-less consumption current2 idd2 - 2.0 4.0 ma input pin=0v, clk=27.8mhz, output load-less high level input voltage vih 0.8 vdd - - v low level input voltage vil - - 0.2 vdd v high level input current iih - - 10 ua low level input current iil - - 10 ua high level output voltage voh1 vdd-0.6 - - v ioh= 1ma low level output voltage vol1 - - 0.6 v iol=1ma downloaded from: http:///
3/4 rev. b ~ dimensions diagram (vqfn20) note) the dotted line part is not recommend mounting. ~ pin descriptions ~ terminal equivalent circuit diagram pin no. terminal name i/o function terminal equivalent circuit 1 u_txd i uart txd signal input b 2 u_rxd o uart txd signal output a 3 - - n.c - 4 brset i setup of baud rate (active hi) b 5 clk i clock input (27.8mhz) b 6 - - n.c - 7 clksel0 i input clock selection b 8 clksel1 i input clock selection b 9 gnd - ground - 10 - - n.c - 11 clk47out 0 the 1/47 clock output of the clock input a 12 clk2out 0 the 1/2 clock output of the clock input a 13 - - n.c - 14 ir_rxd i irda rxd signal input b 15 ir_txd o irda txd signal output a 16 - - n.c - 17 vdd - power supply voltage (2.5v ? 3.5v) - 18 rst i reset input (active hi) b 19 - - n.c - 20 - - n.c - fig.1 (units:mm) " # downloaded from: http:///
4/4 rev. b ~ notes for use (1) absolute maximum ratings we are careful enough for quality control about this ic. so, there is no problem under normal operation, excluding that it exceeds the absolute maximum ratings. however, this ic might be destroyed when the absolute maximum ratings, such as impressed voltages or the operating temperature range, is exceeded, an d whether the destruction is short circuit mode or open circuit mode cannot be specified. pleases take into consideration the physical countermeasures for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed. (2) gnd potential make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. (3) short circuit mode between terminals and wrong mounting in order to mount the ic on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can destroy the ic. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the gnd terminal, the ic can destroy (4) operation in supply voltage range functional circuit operation is guaranteed within operation ambient temperature, as long as it is within opera tion supply voltage range. the electrical characteristics standard value cannot be guaranteed. however, there is no drastic variation in these values , as long as it is within operation supply voltage range. downloaded from: http:///
appendix1-rev3.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / europe / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2008 rohm co.,ltd. 21 saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no respon- sibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). the products are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possi bility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which re quires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the f oreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. downloaded from: http:///
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