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data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 1 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| features ? PT8A995 works as encoder and pt8a996 work as decoders supply voltage: 3.0v to 6.4v internal auto-shutdown function internal over-load protection to meet hd271 safety specification (996) integrated rf circuit (995) two analog channels, one for tachospeed and the other for steering 32 steps for each of two analog channels fine tuning selection for two analog channels few external components needed closed loop adjustment for servo motor (996) built-in voltage regulator (996) package: 16-pin dip (995p), 20-pin dip (996p) and 20-pin soic (996s) applications remote controller toys remote measurement general description: the PT8A995 and pt8a996 provide a simple and economic solution for basic digital proportional r/c car toys. the chipset uses cmos lsi analog and mixed signal technology. they provide high quality encoder/decoder circuit. PT8A995 severs as an encoder. when it is applied in r/c car, the built-in ad converter samples the external tachospeed and steering inputs and converts them into 5-bit digital signals. the internal coder assembles these signals into a multi-frame. it contains header, data and crc value. to obtain accurate timing easily, manches- ter encoding is employed. some digital modulation scheme can be used, e.g., general ask, ook, fsk and qpsk. ook is easy to implement and low cost. pt8a996 works as a decoder. demodulated rf sig- nal will be amplified and filtered in 996 to get baseband signal. dpll is adopted to generate sam- pling clock. the decoder logic can extract f/b, l/r and functional bits from received signal. the outputs are pulse-width-modulated. when motors are blocked, the built-in over-load protection mechanism will work to meet toy safety requirement. PT8A995 rf transmitter pt8a996 rf receiver transmitter receiver figure 1: application diagram
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 2 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| block diagram figure 2. block diagram of PT8A995 oscillator timing generator ad encoder & logic control rf osc osci osco sc ca1 ca2 f/b l/r offset1 offset2 rfout pc irout/sc f1 f2 figure 3. block diagram of pt8a996 osci osco osc vt1 ad srv si current limiter serial to parallel timing generator filter pwm & logic dpll left forward f2 right backward f1 vi1 vi2 vo1 vo2 v cc vref ref vt2 crc check fc
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 3 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| pin configuration top view 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 f2 f1 irout gnd rfout ca1 ca2 sc pc l/r f/b osci osco v cc offset2 offset1 PT8A995p 16-pin dip pin description table 1. pin description of PT8A995 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 forward backward right left gnd vt2 vt1 vo2 vi2 vo1 f2 f1 pc srv osci osco v cc si fc vi1 pt8a996p 20-pin dip 20-pin soic . o n n i p. o n n i p . o n n i p . o n n i p. o n n i pe m a n n i pe m a n n i p e m a n n i p e m a n n i pe m a n n i pn o i t p i r c s e dn o i t p i r c s e d n o i t p i r c s e d n o i t p i r c s e dn o i t p i r c s e d 12 fn i p l o r t n o c n o i t c n u f 2 f 21 fn i p l o r t n o c n o i t c n u f 1 f 3t u o r is e i r r a c z h k 8 3 h t i w e d o c t u p t u o 4d n gd n u o r g 5t u o f rs e i r r a c z h m 9 4 r o m 7 2 h t i w e d o c t u p t u o 61 a ct u p n i r o t a l l i c s o l a t s y r c z h m 9 4 r o m 7 2 72 a ct u p t u o r o t a l l i c s o l a t s y r c z h m 9 4 r o m 7 2 8c se d o c t u p t u o 91 t e s f f ot u p n i d e e p s f o t n e m t s u j d a t e s f f o r o f d e s u 0 12 t e s f f ot u p n i g n i r e e t s f o t n e m t s u j d a t e s f f o r o f d e s u 1 1v c c r e w o p 2 1oo c st u p t u o r o t a l l i c s o l a t s y r c 3 1oi c st u p n i r o t a l l i c s o l a t s y r c 4 1b / fd e e p s d r a w k c a b & d r a w r o f r o f t u p n i 5 1r / lt h g i r & t f e l e l g n a g n i r e e t s r o f t u p n i 6 1c pt u p t u o l o r t n o c r e w o p
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 4 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| . o n n i p. o n n i p . o n n i p . o n n i p. o n n i pe m a n n i pe m a n n i p e m a n n i p e m a n n i pe m a n n i pn o i t p i r c s e dn o i t p i r c s e d n o i t p i r c s e d n o i t p i r c s e dn o i t p i r c s e d 1d r a w r o ft u p t u o d r a w r o f 2d r a w k c a bt u p t u o d r a w k c a b 3t h g i rt u p t u o t h g i r 4t f e lt u p t u o t f e l 5d n gd n g 62 t vt u p n i n o i t c e t o r p t i m i l t n e r r u c r o t o m b / f 71 t vt u p n i n o i t c e t o r p t i m i l t n e r r u c r o t o m r / l 82 o vt u p t u o y f i l p m a e g a t s d n o c e s e h t 92 i vt u p n i y f i l p m a e g a t s d n o c e s e h t 0 11 o vt u p t u o y f i l p m a e g a t s t s r i f e h t 1 11 i vt u p n i y f i l p m a e g a t s t s r i f e h t 2 1c ft u p t u o n o i t c e n n o c a b a t u f 3 1i st u p n i l a n g i s e d o c n e 4 1v c c r e w o p 5 1o c s ot u p t u o r o t a l l i c s o l a t s y r c 6 1i c s ot u p n i r o t a l l i c s o l a t s y r c 7 1v r st u p n i k c a b d e e f r o t o m o v r e s 8 1c pl o r t n o c f f o r e w o p o t u a 9 11 fl o r t n o c 1 n o i t c n u f 0 22 fl o r t n o c 2 n o i t c n u f table 2. pin description of pt8a996
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 5 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| functional description functional description of PT8A995 oscillator circuit a fundamental crystal or ceramic resonator can be used as os- cillator resonator. the central frequency is 455khz. the fre- quency tolerance can be up to 1.5%. internal a/d converter 5-bit a/d converter is built-in. it has four input channels. to get stable analog input, the level should be within 3/8 v cc to 5/8 v cc . the four channels are switched in turn. refer to fig. 3. when a 455khz quartz is used, clk is 1.18khz. f/b and l/ r are converted into 5-bit. offsetx is converted into 3-bit. no external load capacitor is needed. the analog input voltage and the corresponding digitalized values are shown in figure 5. when the chipset is applied in r/c car, there are gross tuning joysticks and fine tuning joysticks for speed and steer- ing respectively. we denote them speedo, speedo, steeringo, steeringo, corresponding to f/b, offset1, l/r, offset2 respectively. offset1 and offset2 complement f/b and l/r offset respectively. if current conversion values are vsp, vspo, vst, vsto, corre- sponding to speedo, speedo, steeringo, steeringo re- spectively, we can describe the speed value to be transmitted as vspeed = vsp + vspo. the steering value is vsteering = vst + vsto. encoder each time the transmitter is active, the chip will assemble speed value and steering value into a multi-frame as shown in figure 6. the multi-frame has two sub-frames, de- noted as odd frame and even frame. after data are assembled, the bit stream is manchester encoded. it is illustrated in figure 7. a rising edge denotes 1, and a falling edge denotes 0. the maximum encoding delay can be calculated by using fol- lowing formula tmax = (48+5) * t clock = 53/1.18khz = 45 (ms) rf circuit rf circuit is integrated for easy application. a fundamental crystal or third-tune crystal is required. the rf frequency can be 27mhz or 49mhz. on-off-keying (ook) scheme is adopted for low cost and easy implementation. auto-shutdown function auto-shutdown function is adopted to lower power consump- tion. once input signal (joysticks, or f1 and f2) are silent for at least 5 minutes, the chip will enter shutdown operation mode, during which most circuits, including rf, are powered down. the chip will exit shutdown operation mode and enter nor- mal operation mode when f1 and f2 are active again. for power dissipation, refer to table 3. when the chip enters shutdown operation mode, pc will out- put low level, which will switch off external circuit. if it op- erates normally, pc maintains high level. if pc is forced to high level, the chip will not be auto-shut down forever. mux a/d f/b l/r offset1 offset2 sa clk figure 4. internal a/d converter of PT8A995
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 6 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 5. analog voltage and digitalized values figure 6. multi-frame structure 0 1 1 1 1 1 1 01 1 13 b f 4 b f00 b f - 2 b f1 f3 f0 c r c 0 1 1 1 1 1 1 00 0 03 l r 4 l r0 0 l r - 2 l r1 f3 f0 c r c odd frame even frame 4 4 fb4-fb0: f/b values rl4-rl0: r/l values f4-f1: function value f4/f3 are reserved figure 7. manchester modulation scheme 0 1 0 1 0 11 00 manchester e d o me d o m e d o m e d o me d o mi ( t n e r r u c n i a r d y l p p u s m u m i x a mi ( t n e r r u c n i a r d y l p p u s m u m i x a m i ( t n e r r u c n i a r d y l p p u s m u m i x a m i ( t n e r r u c n i a r d y l p p u s m u m i x a mi ( t n e r r u c n i a r d y l p p u s m u m i x a m c cc c c c c cc c ) ) ) ) )p ( n o i t a p i s s i d r e w o pp ( n o i t a p i s s i d r e w o p p ( n o i t a p i s s i d r e w o p p ( n o i t a p i s s i d r e w o pp ( n o i t a p i s s i d r e w o p d d d d d ) ) ) ) ) n o i t a r e p o l a m r o na m 0 2w m 0 0 1 n o i t a r e p o n w o d t u h sa u 0 2w u 0 0 1 table 3 1/ 2 47/128v dd 00000 10000 01111 11111 qaz v cc sa 81/128v dd v dd v cc 1/2v cc
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 7 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| functional description of pt8a996 when a baseband signal is applied to vi1 pin, it will be ampli- fied and then filtered by the filter and sent to digital phase- lock-loop (dpll). once the loop is locked into input signal, header in multi- frame structure is detected. data in bit stream are converted into parallel output by serial-to-parallel module. if no crc error is found, the data are valid. at final step, fb and rl will be pulse-width-modulated. an internal a/d converter is required to make servo motor work well. the inputs are srv and offset. when an r/c car is out of control, over-load protection is pro- vided by current limiter. if the r/c car is blocked by some barriers, forward and backward are disabled. if servo motor encounters troublesome, left and right are disabled. timing generator timing generator produces frequency signals of 151khz and 37.8khzfrom a 455khz master clock. internal amplifier the baseband signal is amplified in two stages. an active band- pass filter is applied externally. it can be achieved by rc filter. dpll a digital pll is built in pt8a996 to ensures 1.5 percent car- rier frequency tolerance. 151khz is used as local high fre- quency. pwm modulation scheme the outputs of pt8a996 are pulse-width modulated for pro- portional output. the duty-ratio of output is variable and ad- justed by input on transmitter side. the average level is pro- portional to analog input. the pulse frequency is 37.8khz. duty ratio ranges from 1/64 to 1. the f/b controller works as a proportional adjuster with 32 steps. the l/r controller is made up of position control loop and speed control loop to ensure high accuracy and speed. internal a/d converter 5-bit a/d converter is built-in. it has two input channels. to get stable analog input, the level should be within 3/8 v cc to 5/8 v cc . the scale is linear. a time-division multiplexing method is used as a simple way to switch between two chan- nels in pt8a996. when a 455khz quartz is used, clk is 1.18khz. srv is converted into 5-bit. offset is converted into 3-bit to complement l/r offset (offset2 on transmitter). if current conversion values are vsv and vfd with regarding to srv and offset respectively, we can describe the servo feed- back value to be transmitted as vsrv = vsv + vfd. servo feedback system for more accurate motor position, servo feedback is necessary. overload protection function over-load protection function is shown in figure 9. once vt keeps effective more than te and ineffective less than tm, the chip enters over-load protection mode. it will disable all out- put. the device will exit over-load protection mode when vt is not effective more than 200ms. futaba compatible connection the pt8a996 has a fc pin, whose output signal can directly control futaba ? s servo-motor or other compatible servo-motor. the signal is illustrated in figure 10. vt1 or vt2 vt vt is effective te >= 3s tm < 200ms enters over-load protection state vt is not effective and exists over-load protection 200ms 0.4v figure 9. over-load protection function
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 8 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 10. output from fc pin t 1 t 2 t 1 =0.85ms~1.66ms (pulsewidth adjustment step = 27us) t 2 =13.5ms x1 27m x2 455k f2 1 f1 2 irout 3 gnd 4 rfout 5 ca1 6 ca2 7 sc 8 offset1 9 offset2 10 vcc 11 osco 12 osci 13 f/b 14 l/r 15 pc 16 PT8A995 c9 20p c10 20p sw r9 1k led bat 4-6v c11 0.1u rv2 5.1k rv1 5.1k c14 cs 0.1u ci 33p ro 20k co 33p f2 f1 c01 240 c02 150p c03 15p c06 47p c05 120p c04 39p l01 0.27 l02 0.22u l03 0.36u l04 2.4u c07 27p ant d1 in4148 vcc vcc vcc losc 3u figure 11. application of PT8A995 with internal modulation
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 9 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 12. application of PT8A995 with external modulation x1 27m x2 455k f2 1 f1 2 irout 3 gnd 4 rfout 5 ca1 6 ca2 7 sc 8 offset1 9 offset2 10 vcc 11 osco 12 osci 13 f/b 14 l/r 15 pc 16 PT8A995 c9 20p c10 20p sw r9 3k led bat 7.2- 12v c11 0.1u rv2 5k rv1 5k ant q1 l2 1.5mh c1 68p c2 150p c4 15n c3 1n r2 10 c6 68p c14 cs 0.1u ci 33p vin 1 gnd 2 vout 3 v1 78l05 ro 20k co 33p f2 f1 vcc vrf re1 51 ce 430p q2 9018 rb2 1k cf 0.15u rf 330 rb1 1k vcc vcc vcc vrf losc 3uh re2 51 cp 4.7u l1b la 3.3u
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 10 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 13. supper-regeneration application circuit of pt8a996 a1 c1 10p vt1 c945 c2 27p l1 8.2u c3 3300p c4 4.7u c5 0.01u c6 27p l2 r1 560p r2 22k r4 3.3k r3 22k vt2 c38 0 r5 430 r6 470 c7 100p r7 10k r8 10k c8 0.1u l3 4.7u r10 200 c14 0.01u c15 0.01u g1 455k r11 * left right backward forward vt1 vcc2 si c16 470p c9 0.1u c17 330p c18 4700p r12 2.2m r14 2.2k r13 2.2m r15 2.2k c19 0.1u r16 2.2k vcc 2 forward 1 backward 2 right 3 left 4 gnd 5 vt2 6 vt1 7 vo2 8 vi2 9 vo1 10 vi1 11 fc 12 si 13 vcc 14 osco 15 osci 16 srv 17 pc 18 f1 19 f2 20 pt8a996 r17 5k c20 25p r18 5k feedback si r19 2k r23 300 r24 300 r29 0.2 vt3 irfz48n vt4 irfz48n vt5 irf4905 vt6 irf4905 c10 0.1u vt7 8050 vt8 8050 vt9 8050 vt10 8050 r25 300 r20 2k r26 300 backward forward r30 3k r31 3k vt1 m1 r32 110 c21 100u c11 0.1u c12 0.1u c22 470u vcc2 l4 22u d2 njm431 r9 10k r33 16k b1 3.6v sw 1 b2 3.6v vcc1 vcc1 vcc2 f1 function loading f2 function loading vt11 8050 vt12 8050 vt13 bd237 vt14 bd237 r21 2k r27 300 r28 300 r22 2k vt15 bd238 vt16 bd238 c13 0.1u left right m2 vcc1 r34 1.3k 4.7u c23
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 11 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 14. supper-heterodyne application circuit of pt8a996 g1 455k r1 0~5k left right backward forward vt 1 vcc2 si c1 0.1u c4 330p c5 4700p r2 2.2m r3 2.2k vcc2 forward 1 backward 2 right 3 left 4 gnd 5 vt2 6 vt1 7 vo2 8 vi2 9 vo1 10 vi1 11 fc 12 si 13 vcc 14 osco 15 osci 16 srv 17 pc 18 f1 19 f2 20 pt8a996 r4 5k c6 150p r5 5k feedback si vt1 8050 vt2 8050 vt7 bd237 vt8 bd237 r6 2k r10 300 r11 300 r7 2k vt9 bd238 vt10 bd238 c2 0.1u left right m1 motor 1 r8 2k r12 300 r13 300 r16 0.2 vt11 irfz48n vt12 irfz48n vt13 irf4905 vt14 irf4905 c3 0.1u vt3 8050 vt4 8050 vt5 8050 vt6 8050 r14 300 r9 2k r15 300 backwar forward r17 3k r18 3k m2 motor2 r19 110 c7 100u c8 0.1u c9 0.1u c10 470u vcc2 l1 22u d1 njm431 r20 10k r21 16k b1 3.6v sw1 switch b2 3.6v vcc1 vcc1 vcc1 vcc2 f1 function loading f2 function loading r22 6.8k r23 2.7k r25 120 r26 220 c11 27p c12 0.01u c15 0.01u c17 20p c14 680p c16 0.01u c18 3-10p c19 0.047u c20 3.3u c21 180p l2 5.1u t1 1.2u t3 2u l3 2.2u a 1 g2 27m t2 fl1 455k 1 3 5 6 7 8 10 11 13 pt8a201 vt1 5 9018 vcc2 vcc2 70 82 7 d4 1n60 d3 1n60 r27 510 vt1 r28 1.3k c22 47u d6 1n4148 c23 150p d2 1n60 d5 1n60 r24 2.2k c13 0.1u t1 t2 6:10
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 12 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 15. futaba-s3003 servo application circuit of pt8a996 a1 c1 10p vt1 c945 c2 27p l 1 8.2 u c3 3300p c4 4.7u c5 0.01u c6 27p l2 r1 560p r2 22k r4 3.3k r3 22k vt2 c380 r5 430 r6 470 c7 100p r7 10k r8 10k c8 0.1u l3 4.7u r10 200 c13 0.01u c14 0.01u g1 455k r11 * left right backward forward vt1 v cc2 s i c15 470p c9 0.1u c16 330p c17 4700p r12 2.2m r14 2.2k r13 2.2m r15 2.2k c18 0.1u r16 2.2k v cc2 forward 1 backward 2 right 3 left 4 gnd 5 vt2 6 vt1 7 vo2 8 vi2 9 vo1 10 vi1 11 fc 12 si 13 v cc 14 osco 15 osci 16 srv 17 pc 18 f1 19 f2 20 pt8a996 r17 5k c19 25p r18 5k feedback si r19 2k r21 300 r22 300 vt3 irfz48n vt4 irfz48n vt5 irf4905 vt6 irf4905 c10 0.1u vt7 8050 vt8 8050 vt9 8050 vt10 8050 r23 300 r20 2k r24 300 backward forward r26 3k r27 3k m1 r28 110 c20 100u c11 0.1u c12 0.1u c21 470u v cc2 l4 22u d1 njm431 r9 10k r29 16k b1 3.6v sw1 b2 3.6v v cc1 v cc1 v cc2 f1 function loading f2 function loading si 1 v cc 2 gnd 3 servo1 futaba_s3003 f c fc v cc1 r25 0.2 vt1 r30 1.3k 4.7u c22
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 13 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| figure 16. mechanical diagram of 20-pin soic
data sheet PT8A995/996 digital proportional remote controller with 2 analog chs & 2 digital chs pt0072(05/02) ver:1 14 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| notes pericom technology inc. email: support@pti.com.cn web site: www.pti.com.cn, www.pti-ic.com china : no. 20 building, 3/f, 481 guiping road, shanghai, 200233, china tel: (86)-21-6485 0576 fax: (86)-21-6485 2181 asia pacific : unit 1517, 15/f, chevalier commercial centre, 8 wang hoi rd, kowloon bay, hongkong tel: (852)-2243 3660 fax: (852)- 2243 3667 u.s.a. : 2380 bering drive, san jose, california 95131, usa tel: (1)-408-435 0800 fax: (1)-408-435 1100 pericom technology incorporation reserves the right to make changes to its products or specifications at any time, without noti ce, 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 circuitry described other than the circuitry embodied in pericom technology product. the company makes no representations that circuitry described herein is free from patent infringement or other rights, of pericom technology incorporation.

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