|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| |||||||||||||||||||||||||||||| simple timer 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 1 pt8a 251 6 features ? operating voltage: 3.5v ~ 5.5v. ? h ave reset function ? relay output disable without external oscillator ? adjustable timer: 20mins~16hrs ? quick test mode(qtm) ? few external components ? low cost lead free to 94 - 4 l and sot23 - 5 l package description the pt 8a251 6 is a cmos lsi chip designed for timer application s , the time can be adjusted by external r/c. it has r eset function. the chip includes: power on reset circuit, logic control circuit, output driver circuit, key scan circuit, timer circuit, built - in internal oscillator and external r/c oscillator circuit etc. it is e nclosed in lead free to - 94 and sot23 - 5 package. application s ? timer pin configuration pin description pin no. pin name i/o description to 94 - 4l sot23 - 5 l 1 4 relay o relay output, high active 2 3 vcc i power supply 3 1 osc i/o oscillator's frequency of 8.192k hz with an external r1, c1 . as input, requires a negative pulse to active reset function. 4 2 gnd i ground - 5 nc - not connected to94 - 4 l (top view) sot23 - 5 l (top view) p t 8 a 2 5 1 5 s o t 2 3 - 5 1 2 3 5 4 o s c g n d v c c r e l a y n c
|||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 2 pt8a2516 simple timer simple timer maximum rati n gs storage temperature .. - 40 o c to + 1 25 o c supply voltage to ground potential ( inputs & v cc only ) - 0. 5 to v cc + 0.5 v supply voltage to ground potential (outputs & d/o only) - 0. 5 to v cc + 0.5 v dc input voltage - 0. 5 v to v cc + 0 .5 v dc output current 20ma power dissipatio n 500 mw recommended operation conditions sym description min typ max unit v cc supply vol tage. 3.5 5.0 5.5 v v ih h input voltage 0.8 v cc - - v v il l input voltage - - 0.35 v cc v t a operation temperat ure - 40 25 85 ? c dc electrical characteristics ( unless otherwise noted , v cc = 5v, t a = - 40 ~ 85 oc) symbol parameter test condition min t yp max unit i oh output source current ( relay ) v oh = 4 . 5 v - 10 - - ma i ol output sink current( relay ) v ol =0.5v 10 - 100 u a osc frequency of normal oscillator r1= 47 k c1= cc power supply current v cc = 5 v, r1= 47 k, ? fig 1 test circuit note: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other condi - tions above those indicated in the operational sec - tions of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. osc c urrent po w er meter s upply r1 47k c1 332 gnd 4 osc/reset 3 vcc 2 relay 1 ic pt8a2 515/6ne
|||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 3 pt8a2516 simple timer simple timer block diagram function description (refer to block diagram) the chip mainly includes: powe r on reset circuit, logic control circuit, output driver circuit, key scan circuit, timer circuit, external r/c oscillator circuit and internal oscillator circuit etc. power on reset circuit internal power on reset circuit will reset all the logic circuit a nd the timer; it will clear all output pins when power on. logic control circuit the logic circuit will carries out all the logic control function. i t will check osc pin status, then control the output drive circuit, when timer is out, it will pull down relay pin to release relay. output driver circuit the pin relay will drive a relay. key scan circuit this circuit will detect reset/restart key at osc have a low negative pulse, it will active the corresponding work status. when ic worked normal, it will reset the timer; when timer is out, it will reset the timer and restart the output. timer circuit t his circuit will provide a timer to logic control circuit. w hen fosc = 8.192 khz , timer output is 29486400/8192=1hrs. external r/c oscillator circuit this will produce a system frequency depend on external resistor and cap, the f requency is about 8.192 khz when r1= 47 k and c1= 332 . ( refer to f ig 1 ) . note : the system frequency with external resistor and cap must be between 200hz to 20 khz . internal osc illator a n on - chip rc oscillator with frequency abou t 256 khz is used to check the input signal and the wrong statue of external rc oscillator . qtm in order to make the manufacturers test convenient, quick test mode is designed to speed up the test. qtm can be accessed by pressing button ( reset ) over 3s once power on. it can exit automatically after quick test timer is expired; system come s back normal operation after quick test mode. t imer 1hr 16hr q tm time r 2s 32s osc power on reset circuit logic control osc/reset timer vcc gnd oscillator output relay key scan driver oscillator system oscillator
|||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 4 pt8a2516 simple timer simple timer typical application circuit pt8a2516 sw1 res et r7 47k* c4 332 r6 250 k* c1 474 /25 0vac r1 1m/0 .2 5w d1 1n400 7 d3 1n400 7 d2 1n400 7 d4 1n400 7 zd1 24v c2 47u f/3 5v d5 1n400 7 relay dc24v r2 10k/0.25w q1 2n390 4 r5 4.7k c3 22u f/1 0v zd2 5.1v r3 2k vcc 120vac 60hz out n l relay key vrl led r4 1k gnd 4 osc 3 vcc 2 out 1 p t8a2516ne
|||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 5 pt8a2516 simple timer simple timer mechanical information sot23 - 5 l top mark instruction of sot23 - 5 l package sg : PT8A2516TAE x x : date code : assembly site code
|||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014 - 04 - 0002 pt02 7 3 - 4 0 4 / 0 9 /2014 6 pt8a2516 simple timer simple timer to 94 - 4 l ordering information part no. package code package pt8a 2516n e n lead free to 94 - 4l pt8a 251 6 tae ta lead free and green sot23 - 5 l note: ? e = pb - f ree or pb - free and green ? adding x suffix = tape /r eel pericom semiconductor corporation ? 1 - 800 - 435 - 2336 ? www.pericom.com pericom technology incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. pericom technology does not assume any responsibility for use of any cir cuitry described other than the circuitry embodied in pe ricom technology product. the company makes no representations that circuitry described herein is free from patent infringeme nt or other rights, of pericom.
|
