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TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 1 (12) www.vishay.com document number 82546 sir endec for irda applications integrated interface circuits ulc technology: high-performance gate array package using multiple metal layer cmos technology featuring sub-micron channel lengths (0.35 m) description the TOIM4232 endec ic provides proper pulse shaping for the sir irda ? front end infrared transceivers as of the 4000-series. for transmitting the TOIM4232 shortens the rs232 output signal to irda compatible electrical pulses to drive the infrared transmitter. in the receive mode, the TOIM4232 stretches the received infrared pulses to the proper bit width depending on the operating bit rate. the irda bit rate varies from 2.4 kbit/s to 115.2 kbit/s. the TOIM4232 is using a crystal clock 3.6864 mhz for its pulse stretching and shortening. the clock can be generated by the internal oscillator. an external clock can be used, too. the TOIM4232 is programmable to operate from 1200 bit/s to 115.2 kbit/s by the communication software through the rs232 port. the output pulses are software programmable as either 1.627 s or 3/16 of bit time. the typical power consumption is very low with about 10 mw in operational state and in the order of a few microwatts in standby mode. features pulse shaping function (shortening and stretching) used in sir irda ? applications directly interfaces the sir transceiver tfd.. series to an rs232 port programmable baud clock generator (1200 hz to 115.2 khz), 13 baud rates 3/16 bit pulse duration or 1.627 s pulse selectable so16 package 3 v operation voltage, 5 v tolerant inputs low operating current block diagram endec baud generator logic oscillator td_232 rd_232 br/d reset td_ir rd_ir td_led rd_led v cc _sd s1 s2 v cc gnd x2 x1 figure 1. block diagram
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 2 (12) www.vishay.com document number 82546 pin assignment and description pin symbol function i/o active 1 reset resets all internal registers. initially must be high (a1o) to reset internal registers. when high, the TOIM4232 sets the irda default bit rate of 9600 bit/s, sets pulse width to 1.627 s. the v cc _sd output is simply an inverted reset signal which allows to shut down of a tfdx4x00 transceiver when applying the reset signal to the TOIM4232. when using devices with external sd like tfds4203, the reset line can be used directly as shut down signal. the internal oscillator is stopped during reset active. reset pin can be controlled by either the rts or dtr line through rs232 level converter. minimum hold time for reset: 1 s. i high 2 br/ d baud rate control/ data. br/ d = 0, data communication mode: rs232 txd data line is connected (via a level shifter) to td_232 input pin. the txd signal is appropriately shortened and applied to the output td_ir, driving the txd input of the ir transceiver. the rxd line of the transceiver is connected to the rd_ir input. this signal is stretched to the correct bit length according the programmed bit rate and is routed to the rs232 rxd line at the rd_232 pin. br/ d = 1, programming mode: data received from the rs232 port is interpreted as control word. the control word programs the baud rate width will be effective as soon as br/ d return to low. i 3 rd_232 received signal data output of stretched signal to the rs232 rxd line (using level converter). o high 4 td_232 input of the signal to be transmitted from the rs232 port txd line (passing the level converter). i high 5 v cc _sd outputs an inverted reset signal. can be used to shut down the power supply of a 4000 series transceiver (e.g., tfdu4100). v cc shut- down output function. this pin can be used to shut down a transceiver (e.g., tfdx4xxx). output polarity: inverted reset input. o low 6 x1 crystal input clock, 3.6864 mhz nominal. input for external clock *) i 7 x2 crystal *) i 8 gnd ground in common with the rs232 port and irda transceiver ground 9 td_led transmit led indicator driver. use 180 current limiting resistor in series to led to connect to v cc. (v cc = 3.3 v) o low 10 rd_led receive led indicator driver. use 180 current limiting resistor in series to led to connect to v cc. (v cc = 3.3 v) o low 11 nc no connection 12 s1 user programmable bit. can be used to turn on/ off a front-end infrared transceiver (e.g., an infrared module at the adapter front) o low 13 s2 user programmable bit. can be used to turn on/ off a front-end infrared transceiver (e.g., an infrared module at the adapter back) o low 14 td_ir data output of shortened signal to the infrared transceiver o high 15 rd_ir data input from the infrared transceiver i low 16 v cc supply voltage i *) crystal should be connected as shown in figure 2. in addition connect a 100 k resistor from pin 6 to pin 7 and from pin 6 and pin 7 a 22 pf capacitor to ground, respectively. when an external clock is available connect it to pin 6 leaving pin 7 open.
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 3 (12) www.vishay.com document number 82546 application circuit br/d reset td_232 td_ir rd_ir dtr rs232 9 pin connector vcc txd rxd rts txd rxd rd_232 vcc_sd level converter TOIM4232 tfds4000 tfdu4100 tfds420x x2 x1 3.6864 mhz 100 k 2 x 22 pf figure 2. rs232 port interface (external infrared adapter) table 1. recommended application circuit components component recommended value vishay part number c1 22 pf vj 1206 a 220 j xamt c2 22 pf vj 1206 a 220 j xamt r1 100 k w crcw12061003frt1 quartz crystal 3.686400 mhz xt49s2033.686400m absolute maximum ratings parameter symbol min. typ. max. unit notes supply voltage v cc 0.5 3.6 v input voltage 0.5 5.5 v all pins output voltage 0.5 v cc + 0.5 v all pins output sinking current i out 8 ma all pins junction temperature t j 125 c ambient temperature (operating) t amb 25 85 c storage temperature t stg 25 85 c soldering temperature t sldr 215 230 c t = 20 s @ 215 c
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 4 (12) www.vishay.com document number 82546 dc characteristics parameter symbol min. typ. max. unit notes operating voltage v cc 3.0 3.3 3.6 v v cc = 3.3 v 5%, operating temperature = 25 c to 85 c parameter symbol min. typ. max. unit notes input high voltage v ih 1.7 2.0 v inputs tolerate levels as high as 5.5 v max. all inputs are schmitt trigger inputs input low voltage v il 0.8 1.1 v input schmitt trigger hysteresis v hyst 0.6 v input leakage no pull-up/down i l 10 1 10 a v in = v dd or gnd output high voltage v oh 2.0 v i oh = 2.0 ma g v oh 2.4 v i oh = 0.5 ma output low voltage v ol 0.4 v i ol = + 2.0 ma consumption current standby dynamic i sb i cc 2 1 a ma inputs grounded, no output load v cc = 3.3 v, t = 25 c
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 5 (12) www.vishay.com document number 82546 operation description figure 2 shows a typical example of an rs232 port interface. the TOIM4232 connects to an rs232 level converter on one side, and an infrared transceiver on the other. the internal TOIM4232 baud rate generator can be software controlled. when br/d = 0, the TOIM4232 interprets the channels td_232 to td_ir and rd_ir to rd_232 as data channels. on the other hand, whenever br/d = 1, the TOIM4232 interprets td_232 as control word for setting the baud rate. the baud rate can be programmed to operate from 1200 bit/s to 115 kbit/s. as rs232 level converter, eia232 or max232 or equivalent are recommended. when using the TOIM4232 directly connected to an uart it is compatible to 5 v ttl and 3.3 v cmos logic. typical external resistors and capacitors are needed as shown in the tfdx4xxx references. the output pulse duration can also be programmed, see chapter aoperation descriptiono. it is strongly recommended using 1.627 s output pulses to save battery power. as frequency determining component a vishay xt49m crystal is recommended, when no external clock is available. we strongly recommend not to use this 3/16 mode because 3/16 pulse length at lower bit rates consumes more power than the shorter pulse. at a data rate of 9600 bit/s, the ratio of power consumption of both modes is a factor of 12 (!). programming the TOIM4232 for correct, data rate dependent timing the t oim4232 is using a builtin baud rate generator. this is used when no external clock is not available as in rs232 irdongle applications. for programming the br/d pin has to be set active, br/d = 1. in this case the TOIM4232 interprets the 7 lsbs at the td_232 input as a control word. the operating baud rate will change to its supposedly new baud rate when the br/d returns back to low (a0o) set the uart to 8 bit, no parity, 1 stop bit. control byte (8 bit) first character second character x s2 s1 s0 b3 b2 b1 b0 lsb where x: do not care s1, s2: user programmable bit to program the outputs s1 and s2 s0: irda pulse select = (1) 1.627 s output pulses = (0) 3/16 bit time pulses, not recommended b0 .. b3: baud rate select words baud rate select words note: irda standard only supports 2.4, 9.6, 19.2, 57.6, and 115.2 kbit/s. b3 b2 b1 b0 2nd char baud rate 0 0 0 0 0 115.2 k 0 0 0 1 1 57.6 k 0 0 1 0 2 38.4 k 0 0 1 1 3 19.2 k 0 1 0 0 4 14.4 k 0 1 0 1 5 12.8 k 0 1 1 0 6 9.6 k 0 1 1 1 7 7.2 k 1 0 0 0 8 4.8 k 1 0 0 1 9 3.6 k 1 0 1 0 a 2.4 k 1 0 1 1 b 1.8 k 1 1 0 0 c 1.2 k
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 6 (12) www.vishay.com document number 82546 software for the TOIM4232 uart programming for proper operation, the rs232 must be programmed (using 8 bit, 1 stop, no parity) to send a two character control word, yz. the control word yz is composed of two characters, written in hexadecimal, in format: yz. the transfer rate for programming must be identical with the formerly programmed data rate, or after resetting the TOIM4232, the default rate of 9600 bit/s is used. software algorithm ste p re- set br/d rd_uar t td_uar t rd_i r td_i r description and comments 1 high x x x x x resets all internal registers. resets to irda default data rate of 9600 bit/s. 2 low x x x x x wait at least 7 s. 3 low hig h x x x x wait at least 7 s. TOIM4232 now is set to the control word programming mode. 4 low hig h yz with y = 1 for 1.627 s y = 0 3/16 bit length x x x sending the control word yz. examples: send `1z' if 1.627 s pulses are intended to be used. otherwise send `0z' for 3/16 bit period pulses. `y6' keeps the 9.6 kbit/s data rate. z = 0 sets to 115.2 kbit/s, see programming table. wait at least 1 s for hold-time. 5 low low data data data data with br/d = 0, TOIM4232 is in the data communication mode. both reset and br/d must be kept low (`0') during data transmission. reprogramming to a new data rate can be resumed by restarting from step 3. the uart itself also must be set to the correct data rate *). *) for programming the uart, refer to e.g., national semiconductor's data sheet of pc 16550 uart.
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 7 (12) www.vishay.com document number 82546 package information 10.5 10.1 0.49 0.35 1.27 8.89 0.25 0.10 2.45 2.25 9.25 8.75 7.5 7.3 10.56 10.15 0.3 0.2 16 9 18 13011 technical drawings according to din specifications package so16l dimensions in mm
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 8 (12) www.vishay.com document number 82546 recommended application circuits z1 r2 r1 dtr (reset) vcc j1 con9 1 2 3 4 5 6 7 8 9 r4 c5 c2 1 2 3 4 5 6 7 8 9 15 14 13 12 11 10 16 reset br/data rd 232 td 232 vcc sd x1 x2 gnd td led rd ir td ir s2 s1 nc rd led vcc j2 con2 1 2 c9 z2 u1 max3232cse 13 8 11 10 1 3 4 5 2 6 12 9 14 7 16 15 r1in r2in t1in t2in c+ c1 c2+ c2 v+ v r1out r2out t1out t2out vcc gnd c6 c3 1 m f y1 c1 txd c4 1 m f c11 r3 vcc c8 ired ired 2 4 6 8 7 5 3 1 cathode rxd vcc1 gnd sc nc txd anode rts (br/d) rxd c7 c10 r6 + + + + + + ext. input 3.3 v dc vcc + 16527 u2 TOIM4232 u4 tfdu4100 figure 3. application circuit using tfdu4100 with an integrated level shifter max3232cse. when used directly with 3 v logic, this one can be emitted z1 r2 r1 dtr (reset) vcc j1 con9 1 2 3 4 5 6 7 8 9 r4 c5 c2 1 2 3 4 5 6 7 8 9 15 14 13 12 11 10 16 reset br/data rd 232 td 232 vcc sd x1 x2 gnd td led rd ir td ir s2 s1 nc rd led vcc j2 con2 1 2 c9 z2 u1 max3232cse 13 8 11 10 1 3 4 5 2 6 12 9 14 7 16 15 r1in r2in t1in t2in c+ c1 c2+ c2 v+ v r1out r2out t1out t2out vcc gnd c6 c3 1 m f y1 c1 txd c4 1 m f c11 r3 vcc c8 ired ired 1 2 3 4 5 6 7 8 cathode rxd vcc1 gnd sc nc txd anode rts (br/d) rxd c7 c10 r6 + + + + + + ext. input 3.3 v dc vcc + 16528 u2 TOIM4232 u3 tfds4500 figure 4. application circuit using tfdu4500 with an integrated level shifter max3232cse. when used directly with 3 v logic, this one can be emitted
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 9 (12) www.vishay.com document number 82546 table 2. recommended application circuit components component recommended value vishay part number c1 100 nf vj 1206 y 104 j xxmt c2 10 f, 16 v 293d 106x9 016b 2t c3 100 nf vj 1206 y 104 j xxmt c4 100 nf vj 1206 y 104 j xxmt c5 100 nf vj 1206 y 104 j xxmt c6 100 nf vj 1206 y 104 j xxmt c7 1 f, 16 v 293d 105x9 016a 2t c8 22 pf vj 1206 a 220 j xamt c9 22 pf vj 1206 a 220 j xamt c10 6.8 f, 16 v 293d 685x9 016b 2t c11 100 nf vj 1206 y 104 j xxmt z1 3.6 v bzt55c3v6 z2 3.6 v bzt55c3v6 r1 5.6 k w crcw12065601frt1 r2 100 k w , optional, for reducing oscillator start up time crcw12061003frt1 r3 47 w crcw120647r0frt1 r4 20 w crcw120627r0frt1 r6 20 w crcw120627r0frt1 y1 3.686400 mhz xt49s203.686400m u1 maxim max 3232cse u2 TOIM4232 u3, u4 tfds4500 or tfdu4100 j1 9 pin dsub cannon j2 power connector pcb vishay dongle 4
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 10 (12) www.vishay.com document number 82546 recommended circuit diagram for using TOIM4232 and tfds4500 in ir adapters at the serial port vb1 subd 9 5 9 4 8 3 7 2 6 1 3 1 c6 r12/1 txd r9 r11 ired1 vcc 3 1 2 r12/2 rts c4 rxd q3 3 1 2 r10 c5 +3,3v led 1 3 4 5 6 7 8 1 2 vcc gnd sensitivity nc (agcopt.) txd ired anode ired cathode rxd r17 jumper dtr 1 2 3 4 5 6 7 8 9 15 14 13 12 11 10 16 reset br/data rd 232 td 232 vcc sd x1 x2 gnd td led rd ir td ir s2 s1 nc rd led vcc r18 c3 3 1 2 vcc led 2 qz1 dtr d4 3 1 + c1 r13 q4 d7 d6 d5 q2 r2 r6 q1 r5 r1 d1 d2 r3 rxd txd dtr rts + c2 txd rxd rts dtr +3.3 v + u1 TOIM4232 u2 tfds4500 when v cc is used, leave off jumper when v cc sd from u1 is used, place jumper and leave off r11 and c6 due to the very limited power to be drawn out of the rs232 port, it is recommended to operate the leds for displaying the state of transmission (d3, d4) with lowest possible current or not to use this function without external power supply. pcb layout, gerber plots, comp onent list, and control software are available on request. circuit diagram refers to toim3232. the operating voltage for the TOIM4232 is reduced to 3.3 v typical. therefore the equivalent component values have to be adapted. figure 5. discrete solution for the interface to the rs232 port
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 11 (12) www.vishay.com document number 82546 table 3. recommended application circuit components component recommended value vishay part number c1 22 f, 16 v 293d 226x9 016c 2t c2 47 f, 16 v 293d 476x9 016d 2t c3 22 pf vj 1206 a 220 j xamt c4 22 pf vj 1206 a 220 j xamt c5 100 nf vj 1206 y 104 j xxmt c6 6.8 f, 16 v 293d 685x9 016b 2t d1 1n4148 d2 1n4148 d4 bzt55c4v7 d5 1n4148 d6 1n4145 d7 bzt55c3v9 ired1 tshf5400 jumper crcw1206000frt1 led1 tlly4401 led2 tllg4401 q1 bc81725 q2 vp 0610 0t q3 bc81725 q4 bc81725 qz1 3.686400 mhz xt49s203.686400m r1 22 k w crcw12062202frt1 r2 10 k w crcw12061002frt1 r3 22 k w crcw12062202frt1 r5 1 k w crcw12061001frt1 r6 47 k w crcw12064702frt1 r9 5.6 k w crcw12065601frt1 r10 100 k w , optional, for reducing oscillator start up time crcw12061003frt1 r11 100 w crcw12061000frt1 r12 20 w crcw120620r0frt1 r13 1 k w crcw12061001frt1 r17 750 w crcw12067500frt1 r18 750 w crcw12067500frt1 vb1 subd9 cannon pcb
TOIM4232 vishay semiconductors rev. a1.1, 31-jul-02 12 (12) www.vishay.com document number 82546 ozone depleting substances policy statement it is the policy of vishay semiconductor gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (odss). the montreal protocol (1987) and its london amendments (1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. vishay semiconductor gmbh has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2. class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency (epa) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c (transitional substances) respectively. vishay semiconductor gmbh can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice. parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use vishay semiconductors products for any unintended or unauthorized application, the buyer shall indemnify vishay semiconductors against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. vishay semiconductor gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 (0)7131 67 2831, fax number: 49 (0)7131 67 2423

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