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rev. 1.00 1 june 07, 2013 rev. 1.00 pb june 07, 2013 ht6p235a/HT6P245A learning rf encoder without crystal selection table part no. v dd addr. no. data no. compound data no. trig. frequency band rf type package ht6p235a 2.5v~3.6v 22 2 1 data low 433mhz ask tx 16 nsop HT6P245A 2.5v~3.6v 24 4 2 data low 433mhz ask tx 16 nsop features ? operating voltage: 2.5v~3.6v ? average operating current ? 20ma @ v dd =3.0v, 12dbm ? 30ma @ v dd =3.0v, 16dbm ? standby current: 1.0a (max.) @ v dd =3v ? up to 4 data pins ? 2 compound data trigger pins ? up to 2 24 address codes ? integrated 13.56mhz rc oscillator ? 8 bit time using 2 pin selection ? integrated uhf transmitter ? frequency: 433mhz ? supports ask/ook modulation ? 3 output power levels: 12dbm/14dbm/16dbm using a single pin selection ? minimal external components ? high noise immunity ? 16-pin nsop package applications ? burglar alarm systems ? smoke and fre alarm systems ? personal alarm systems ? car/garage door controllers ? home/offce/car security systems ? other remote control systems general description the devices are a series of encoders which include a fully integrated 433mhz ask transmitter for remote control system applications. they form a highly functionally integrated device series which can be described as true switch-in, antenna-out monolithic devices. the devices encode 24 or 28 bits of address and data information and then serially transmits it via their dout pin upon receipt of a transmission enable signal which is provided by data pins, d0~d3 or b0~b1. the devices also encode the address and data information into a coded waveform which is transmitted out on their paout pin for rf modulation. two areas stand out for special attention, those of power delivery and operating temperature. in terms of power, the ht6p2x5a is capable of delivering +16dbm into a 50 load, a power level which enables a small form factor transmitter, such as a key fob transmitter, to operate over a long distance. in terms of temperature, the ht6p2x5a can operate from -10?c to 50?c with very little frequency drift. additionally the devices are extremely easy to use and having a fully integrated oscillator require only a minimum of external components to implement a complete and versatile transmitter. for longer distance remote control, the devices operate together with an ask/ook C amplitude shift keying/on-off keyed C uhf wide-band super-regenerative receiver.
rev. 1.00 2 june 07, 2013 ht6p235a/HT6P245A block diagram
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rev. 1.00 3 june 07, 2013 ht6p235a/HT6P245A pin description pin no. pin name i/o internal connection description 1~2 b1~b0 i cmos in compound pins. b0 is for d0 and d3 while b1 is for d1 and d2 in the HT6P245A/devices b0 is for d0 and d1 in the ht6p235a 3~4 bts1~bts0 i cmos in bit time select pins. externally set to v dd , ground or foating to provide eight bit width selections as shown in the functional description section. 5 ops i cmos in output power select pin. externally set to v dd , ground or foating to provide three power output selections vdd: 16dbm, floating: 14dbm, gnd: 12dbm 6 vdd p positive power supply 7 vss p negative power supply, ground 8 paout o power amplifer output it should be combine with external matching circuit 9 pvss p rf negative power supply, ground 10 nc 11 cref o cmos out for test mode only 12 dout o cmos out data output pin 13~16 d0~d3 i cmos in data input and transmission enable active low. pin 15 should be connected to ground in ht6p235a 16 btsgs ht6p235a only i cmos in bit time group select, 0: bit time group 1 1: bit time group 2 as shown in the functional description section. this pin must be tied either high or low and not be allowed to foat approximate internal connections
rev. 1.00 4 june 07, 2013 ht6p235a/HT6P245A absolute maximum ratings logic supply voltage ..v ss -0.3v to v ss +3.6v logic input voltage .v ss -0.3v to v dd +0.3v logic output voltage v ss -0.3v to v dd +0.3v storage temperature ....-55?c to 150?c operating temperature...-10?c to 50?c note: these are stress ratings only. stresses exceeding the range specifed under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specifcation is not implied and prolonged exposure to extreme conditions may affect device reliability. d.c. characteristics ta=25c symbol parameter test condition min. typ. max. unit v dd condition v dd logic supply voltage 2.5 3.0 3.6 v i sb stand-by current 3 no load. input pins foating 1.0 a v ih h input voltage 0.8v dd v v il l input voltage 0.2v dd v r pl pull-high resistance 3 d0~d3, b0~b1 500 k i oh hi-level output current 3 v oh =0.9v dd ; d out -7 ma i ol low-level output current 3 v ol =0.1v dd ; d out 2 ma r.f. characteristics specifcations apply for t a =25c, freq 433mhz unless otherwise noted. r l 50 load (matched) symbol parameter test conditions min. typ. max. units v dd conditions i 1 average data current* 50% duty cycl e dat a 3v @ 433mhz, pout=+16dbm 25 ma @ 433mhz, pout=+12dbm 15 i 0 data low current 3v 6 ma rf and crystal output power level 3v ops 0 12 dbm floating 14 1 16 f hirc 13.56mhz internal rc oscillator 3v -0.5% 13.56 +0.5% mhz extinction ratio for ask 10kbps 3v 70 dbc output blanking 3v stdby transition from low to high 500 s ask to rf out response time 3v delta between ask input transition from low to high to rf output transition from low to high 1 s note: it is recommended that the vdd power on rise time should be less than 500us to allow the device to power up normally and start normal operation.
rev. 1.00 5 june 07, 2013 ht6p235a/HT6P245A functional description the ht6p2x5a encodes the address code and data set into a special waveform and output it to the d out . this waveform is fed to the rf modulator for transmission. normal operation the ht6p2x5a series encodes and transmits address/data to a decoder upon receipt of a trigger signal. the transmission function of the ht6p2x5a series are enabled by the data inputs, d0~d3 with the C b0~b1 pins using active low conditions. d0~d3, b0 1ms (typ.) dout pilot code address/data/end code the transmission sequence is pilot, address, data, end code. d0~d3, b0 < 1 pilot code > 1 code word 1 code word 1 pilot code < active < 1 code word dout transmission timing diagram 1.1 code bits a code bit is the basic component of the encoded waveform, and can be classifed as either an address/data bit or a pilot-code which is a synchronous bit. 1.2 address/data bit waveform an address/data bit can be designated as either bit 0 or 1 if it is in a high or low state respectively. a single bit waveform consists of three pulse cycles, as shown the diagram. bit ?0? t dw 1 2 address/data bit 1 2 bit ?1? note: 1. bit 0 consists of a low pulse for 1 then changes to a high pulse for 2. 2. bit 1 consists of a low pulse for 2 then changes to a high pulse for 1. 1.3 single-bit data width there are 8 different single-bit data widths as shown in the table, selected using the bts1 and bts0 control pins. symbol parameter pin condition group1 group2 unit t dw 6ljohelwgdwdlgwk bts1/bts0 0/0 1.1 0.7 ms ordwlj 1.2 0.8 0/1 1.3 0.9 ordwlj 1.4 1.0 ordwljordwlj 1.5 2.0 ordwlj 1.6 2.1 1/0 1.76 2.2 ordwlj 1.9 2.3 1/1 nc nc note: 1. group2 is only available for ht6p235a. 2. the bts0 and bts1 pins can be set to either 1, 0 or floating. 3. the bts0 and bts1 pins must not both be 1, this can result in erroneous operation. 4. if an overlapping bit time situation exists then choose the nearest time bit value. for example if the desired bit time is 1.46ms, then a choice of 1.5ms is preferred.
rev. 1.00 6 june 07, 2013 ht6p235a/HT6P245A 1.4 synchronous bit waveform for the ht6p2x5a device, a synchronous bit waveform is 8-bits long. it exhibits a low pulse for 23 followed by a high pulse for 1 as shown in the diagam. pilot code 23 1 1.5 code word a group of code bits is called a code word. a code word consists of one pilot-code or synchronous bit followed by the address/data bits and the end-code. ? ht6p235a pilot-code a0~a21 d1~d0 0101 ? HT6P245A pilot-code a0~a23 d3~d0 0101 1.6 operation flowchart power on no yes yes stand-by mode data input pin in low state data input pin still in low state no 1 word of pilot/address/data/end transmitted
rev. 1.00 7 june 07, 2013 ht6p235a/HT6P245A application circuits ht6p235a HT6P245A
rev. 1.00 8 june 07, 2013 ht6p235a/HT6P245A package information note that the package information provided here is for consultation purposes only. as this information may be updated at regular intervals users are reminded to consult the holtek website for the latest version of the package information. additional supplementary information with regard to packaging is listed below. click on the relevant section to be transferred to the relevant website page. ? further package information (include outline dimensions, product tape and reel specifcations) ? packing meterials information ? carton information ? pb free products ? green packages products
rev. 1.00 9 june 07, 2013 ht6p235a/HT6P245A 16-pin nsop (150mil) outline dimensions ms-012 symbol dimensions in inch min. nom. max. a 0.228 D 0.244 b 0.150 D 0.157 c 0.012 D 0.020 c ? 0.386 D 0.402 d D D 0.069 e D 0.050 D f 0.004 D 0.010 g 0.016 D 0.050 h 0.007 D 0.010 0 D 8 symbol dimensions in mm min. nom. max. a 5.79 D 6.20 b 3.81 D 3.99 c 0.30 D 0.51 c ? 9.80 D 10.21 d D D 1.75 e D 1.27 D f 0.10 D 0.25 g 0.41 D 1.27 h 0.18 D 0.25 0 D 8
rev. 1.00 10 june 07, 2013 ht6p235a/HT6P245A copyright ? 2013 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifcations described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw .

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