Digital Proportional Remote Controller. Digital proportional Remote Controller. Application Notes. Page 1

Transcription

1 查询 PT8A995P 供应商 捷多邦, 专业 PCB 打样工厂,24 小时加急出货 Digital Proportional Remote Controller Digital proportional Remote Controller Application Notes Page 1

2 Why proportional control Simple action control Proportional control a R a1 a2 a3 R1 R2 R R R3 Left: no turn, full left turn Forward: stop, low-speed, high-speed (100% full) Example: PT8A977/978 (Forward, backward, left, right, turbo ) Left turn wheel: 0 center, 1 degree, 2 degree Forward: 0 stop, 1%, 2% 100% Page 2

3 Two CH Digital proportional control 5 bit data for proportional -15, -14, -13, -2, -1, 0, 1, 2, 3, 13, 14, SYNC + CH1 + CRC1 + CH2 + CRC2 Page 3

4 Two CH Analog proportional control CH1 CH2 Page 4

5 Traditional proportional control Batteries Servo Controller and and Servo Motor Speed Motor Speed Motor Antenna RF Receiver RF Receiver Electronic Speed Controller Page 5

6 PT8A995/996 Overview Page 6

7 Receiver IC PT8A996 Integrated servo controller (except power transistor) Integrated speed controller (except power transistor) Page 7

8 Transmitter IC PT8A995 code, modulation, RF Amp Page 8

9 F/B L/R F1 F2 offset1 offset2 PT8A 995 RF filter RF receiver PT8A 995 F/B L/R F1 F2 offset FB PT8A995 works as encoder and PT8A996 works as decoder Two Digital Proportional channels, 5Bit resolution ratio (+/-15 steps) Two Fine-tuning for Digital Proportional channels (offset +/- 3 steps) Tow nominal control channels Page 9

10 Build-in 5bit AD convector Using Manchester code with out DC offset Build-in DPLL for data Sample to improve bit error rate Tow motors over-load protection to meet HD271 safety specification One Attach pin compatible Futaba S3003 servo set Few external components needed Built-in voltage regulator (996P) Page 10

11 Build-in complete RF circuit (995P) Build-in RF low voltage PA, 6V, (995P) Build-in tow stage amplifies to improve sensitivity (996P) Base band signal sensitivity overmatch 5mVpp (996P) With super-regenerative RF sensitivity overmatch 100dbm (996P) One complete closed loop adjustment for servo motor (996P) One open loop adjustment for motor speed (996P) Page 11

12 PT8A995 Block Diagram OSCI OSCO F/B L/R OFFSET1 OFFSET2 Oscillator AD Timing Generator F1 F2 Encoder & Logic Control Reset PC SC IRout SC CA1 CA2 RF Osc RFout V DD Power On Page 12

13 Internal A/D Converter of PT8A995P F/B L/R Offset1 Offset2 MUX SA A/D D0 D1 D2 D3 D4 CLK F/B, L/R Proportional channels, 5Bit resolution ratio (+/-15 steps) Two Fine-tuning (offset1, offset2) for Digital Proportional channels ( +/- 3 steps) Page 13

14 Offset balance resistor PT8A995P VDD VDD 1M Offset1/2 200K 1M Independence offset input compliant 2-channel pistol grip radio Internal base when using machine Fine trims for two-stick radio Page 14

15 Analog Voltage and Digitized Values QAZ Input Range is ¼ Vdd (-15 ~ +15 step) Central point is ½ Vdd /128VDD 1/2V DD 81/128VDD SA Page 15

16 Encoder Odd Frame FB4 FB3 0 FB2-FB0 F1 F3 0 CRC Even Frame RL4 RL3 0 RL2-RL0 F2 F4 0 CRC Notes: FB4-FB0: F/B values; RL4-RL0: R/L values; F2-F1: function value; F4/F3 are reserved Page 16

17 Manchester base band code scheme Original Data Code Manchester base band code Using Manchester code without DC offset Manchester code have enough edges for receiver recover clock Page 17

18 Internal RF Modulation (AMK) SC RF OUT CA1 CA2 Integrated modulation RF circuit for easy application Can use fundamental crystal or third-tune crystal The RF frequency can be 27MHz or 49MHz Low voltage RF PA for 6V Batteries power supply Page 18

19 PT8A996 Block Diagram SI OSCI OSCO OSC Timing Generator Filter DPLL CRC Check Serial To Parallel PWM & Logic Right Left Forward Backward F1 F2 FC V CC VT1 VT2 REF Vref Current Limiter SRV AD VI1 VO1 VI2 VO2 Page 19

20 Amplify (PT8A996) VI1 VO1 VI2 VO2 SI A(f) 40dB 500HZ 4kHz f The base-band signal is amplified in two stages amplifier. With external RC build a band-pass filter to reduce noise. Page 20

21 DPLL (PT8A996) 2.37kHz Up- Counter SI-F DPD N-Counter CLK=1.18kHz Down- Counter 151kHz DPLL recover clock from base band signal Use DPLL out Sample the data Page 21

22 Motor Over-Load Protection VT1 and VT2 Pin is use for Over-load protection Use Rs detect Motor current Once VT keeps effective more than T e and ineffective less than T m, the chip enters over-load protection mode. It will disable all output. Page 22

23 Application Circuit Page 23

24 Page 24 Digital Proportional Remote Controller X1 27M X2 455K F2B 1 F1B 2 IROUT 3 GND 4 RFout 5 CA1 6 CA2 7 SC 8 OFFSE1 9 OFFS2 10 VDD 11 OSCo 12 OSCi 13 F/B 14 L/R 15 PC 16 IC1 PT8A995 C9 20p C10 20p SW R9 1K LED BAT 4-6v C11 RV2 5.1k RV1 5.1k C14 CS CI 33p RO 20k CO 33p F2 F1 C C02 150p C03 15p C06 47p C05 120p C04 39p L L u L u L04 2.4u C07 27p ANT D1 IN4148 Vdd Vdd Vdd LOSC 3u

25 Page 25 Digital Proportional Remote Controller X1 27M X2 455K F2B 1 F1B 2 IROUT 3 GND 4 RFout 5 CA1 6 CA2 7 SC 8 OFFSE1 9 OFFS2 10 VDD 11 OSCo 12 OSCi 13 F/B 14 L/R 15 PC 16 IC1 PT8A995 C9 20p C10 20p SW R9 3k LED BAT V C11 RV2 5k RV1 5k ANT Q1 L2 1.5mH C1 68p C2 150p C4 15n C3 1n R2 10 C6 68p C14 CS CI 33p Vin 1 GND 2 Vout 3 V1 78L05 RO 20k CO 33p F2 F1 Vdd VRF RE1 51 CE 430p Q RB2 1K CF 0.15u RF 330 RB1 1K Vdd Vdd Vdd VRF LOSC 3uH RE2 51 CP 4.7u L1B LA 3.3u

26 Page 26 Digital Proportional Remote Controller 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 C380 R5 430 R6 470 C7 100p R7 10k R8 10k C8 L3 4.7u R C u C u G1 455k R11 * Left Right Back For VT1 VCC2 SI C16 470p C9 C17 330p C p R12 2.2M R14 2.2k R13 2.2M R15 2.2k C19 R16 2.2k VCC2 FORWD 1 BACKWD 2 RIGHT 3 LEFT 4 GND 5 VT2 6 VT1 7 VO2 8 VI2 9 VO1 10 VI1 11 FC 12 SI 13 VDD 14 OSCO 15 OSCI 16 SRV 17 PC 18 F1 19 F2 20 IC1 PT8A996 R17 5k C20 150p R18 5k FeedBack SI R19 2k R R R VT3 IRFZ48N VT4 IRFZ48N VT5 IRF4905 VT6 IRF4905 C10 VT VT VT VT R R20 2k R Back For R30 3k R31 3k VT1 M1 R C21 100u C11 C12 C22 470u VCC2 L4 22u D1 NJM431 R9 10k R33 16k B1 3.6v SW1 B2 3.6v VCC1 VCC1 VCC2 F1 Function Loading F2 Function Loading VT VT VT13 BD237 VT14 BD237 R21 2k R R R22 2k VT15 BD238 VT16 BD238 C13 Left Right M2 VCC1 R34 1.3k C23 4.7u C24 150p

27 Page 27 Digital Proportional Remote Controller G1 455k R1 0~5k Left Right Back For VT1 VCC2 SI C1 C4 330p C5 4700p R2 2.2M R3 2.2k VCC2 FORWD 1 BACKWD 2 RIGHT 3 LEFT 4 GND 5 VT2 6 VT1 7 VO2 8 VI2 9 VO1 10 VI1 11 OFFSET 12 SI 13 VDD 14 OSCO 15 OSCI 16 SRV 17 PC 18 F1 19 F2 20 IC1 PT8A996 R4 5k C6 150p R5 5k FeedBack SI VT VT VT7 BD237 VT8 BD237 R6 2k R R R7 2k VT9 BD238 VT10 BD238 C2 Left Right M1 Motor1 R8 2k R R R VT11 IRFZ48N VT12 IRFZ48N VT13 IRF4905 VT14 IRF4905 C3 VT VT VT VT R R9 2k R Back For R17 3k R18 3k M2 Motor2 R C7 100u C8 C9 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 R R C11 27p C u C u C17 20p C14 680p C u C p C u C20 3.3u C21 180p L2 5.1u T1 1.2u T3 2u L3 2.2u A1 G2 27M T2 FL1 455k PT8A201W VT VCC2 VCC D4 1N60 D3 1N60 IC2 R VT1 R28 1.3k C22 47u D6 1N4148 C23 150p D2 1N60 D5 1N60 R24 2.2k C13 T1 T2 6:10