Digital proportional Remote Controller

Page 1

Digital Proportional Remote Controller

Digital proportional Remote Controller

Application Notes

Download from www.ICminer.com Electronic-Library Service

查询PT8A995P供应商捷多邦，专业PCB打样工厂，24小时加急出货

http://www.dzsc.com/icstock/564/PT8A995P.html

http://www.jdbpcb.com/J/

http://pdf.dzsc.com/

Page 2


Why proportional controlSimple action control

Left:no turn, full left turnForward:stop, low-speed, high-speed(100% full)

a

R

R

R

Proportional control

a2

a1

a3

R1

R2

R3

Left turn wheel:0 center, 1 degree, 2 degree…Forward:0 stop, 1%, 2%… 100%

Example:PT8A977/978…(Forward, backward, left, right, turbo…)


Page 3


Two CH Digital proportional control

5 bit data for proportional

-15, -14, -13, … -2, -1, 0,

1, 2, 3, … 13, 14, 15

01

23

456

789101112131415

-1-2

-3-4-5-6

-12

-9-11

-10

-8 -7

-15 -14 -13

SYNC + CH1 + CRC1 + CH2 + CRC2


Page 4


Two CH Analog proportional control

CH1

CH2


Page 5


Traditional proportional control

Servo Controller and Servo Motor

Servo Controller and Servo Motor

RF ReceiverRF Receiver

Electronic Speed Controller

Electronic Speed Controller

BatteriesBatteries

Antenna Antenna

Speed MotorSpeed Motor


Page 6


PT8A995/996

Overview


Page 7


Receiver IC ----- PT8A996Integrated servo controller (except power transistor)

Integrated speed controller (except power transistor)


Page 8


Transmitter IC ------ PT8A995code, modulation, RF Amp


Page 9


F/BL/RF1F2offset1offset2

PT8A995

RFfilter

F/BL/RF1F2offsetFB

PT8A995

RFreceiver

• 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 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 safetyspecification

• One Attach pin compatible Futaba S3003 servo set

• Few external components needed

• Built-in voltage regulator (996P)


Page 11


• Build-in complete RF circuit (995P)

• Build-in RF low voltage PA, 6V, 50mW @27MHz (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 12


OscillatorTiming

Generator

PowerOn

AD

Encoder&

LogicControl

RFOsc

OSCIOSCO

SCCA1CA2

F/BL/R

OFFSET1OFFSET2

Reset

VDD

RFout

PC

SCF1

F2IRout

PT8A995 Block Diagram


Page 13


MUX A/D

F/B

L/R

Offset1

Offset2

SA

CLK

D0D1D2D3D4

Internal A/D Converter of PT8A995P

• F/B, L/R Proportional channels, 5Bit resolution ratio (+/-15 steps)

• Two Fine-tuning (offset1, offset2) for Digital Proportional channels (+/- 3 steps)


Page 14


VDD VDD

1M

200K

1M

Offset1/2

Offset balance resistor PT8A995P

• Independence offset input compliant 2-channel pistol grip radio

• Internal base when using machine Fine trims for two-stick radio


Page 15


SA81/128VDD1/2VDD47/128VDD

00000

1000001111

11111

QAZ

Analog Voltage and Digitized Values

• Input Range is ¼ Vdd(-15 ~ +15 step)

• Central point is ½ Vdd


Page 16


0 1 1 1 1 1 1 0 1 1 1 FB4 FB3 0 FB2-FB0 F1 F3 0 CRC

0 1 1 1 1 1 1 0 0 0 0 RL4 RL3 0 RL2-RL0 F2 F4 0 CRC

Odd Frame

Even Frame

Notes:FB4-FB0: F/B values;RL4-RL0: R/L values;F2-F1: function value;F4/F3 are reserved

Encoder


Page 17


Manchesterbase band code

OriginalData Code

Manchester base band code scheme

• Using Manchester code without DC offset

• Manchester code have enough edges for receiver recover clock


Page 18


• 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

Internal RF Modulation (AMK)

SC

RFOUT

CA1

CA2


Page 19


PT8A996 Block Diagram

OSCI

OSCOOSC

VT1

ADSRV

SI

CurrentLimiter

SerialTo

Parallel

TimingGenerator

Filter

PWM&

Logic

DPLLLeftForward

F2

Right

BackwardF1

VI1 VI2VO1 VO2

VCC VrefREF

VT2

CRCCheck

FC


Page 20


• The base-band signal is amplified in two stages amplifier.• With external RC build a band-pass filter to reduce noise.

Amplify (PT8A996)

VI1 VO1 VI2 VO2 SI

A(f)

40dB

500HZ 4kHzf


Page 21


DPD

Up-

Counter

N-Counter

Down-

Counter

151kHz

SI-F CLK=1.18kHz

2.37kHzDPLL (PT8A996)

• DPLL recover clock from base band signal• Use DPLL out Sample the data


Page 22


• VT1 and VT2 Pin is use for Over-load protection

• Use Rs detect Motor current

• Once VT keeps effective more than Te and ineffective less than Tm,

the chip enters over-load protection mode. It will disable all output.

Motor Over-Load Protection


Page 23


Application Circuit


Page 24


X127M

X2455K

F2B1

F1B2

IROUT3

GND4

RFout5

CA16

CA27

SC8

OFFSE19

OFFS210

VDD11

OSCo12

OSCi13

F/B14

L/R15

PC16

IC1

PT8A995

C9

20p

C10

20p

SW

R9

1K

LED BAT

4-6v

C110.1u

RV2

5.1k

RV1

5.1k

C14

CS

0.1u

CI33p

RO

20kCO33p

F2

F1

C01

240 C02150p

C0315p C06

47p

C05120p

C04

39p

L01

0.27

L02

0.22uL03

0.36u

L04

2.4u

C07

27p

ANT

D1IN4148

Vdd

Vdd

Vdd

LOSC

3u


Page 25


X127M

X2455K

F2B1

F1B2

IROUT3

GND4

RFout5

CA16

CA27

SC8 OFFSE1 9

OFFS2 10

VDD 11

OSCo 12

OSCi 13

F/B 14

L/R 15

PC 16IC1

PT8A995

C920p

C1020p

SW

R93k

LED

BAT

7.2-12V

C110.1u

RV25k

RV15k

ANT

Q1

L21.5mH

C1

68pC2150p

C415n

C31n

R210

C668p

C14

CS0.1u

CI33p

Vin 1

GN

D2

Vout3

V178L05

RO

20k

CO33p

F2

F1

Vdd

VRF

RE1

51

CE

430p

Q29018

RB21K

CF0.15u

RF

330

RB11K

Vdd

Vdd

Vdd

VRF

LOSC

3uH

RE2

51

CP4.7u

L1BLA

3.3u


Page 26


A1

C110p

VT1C945

C227p

L18.2u

C33300p

C44.7u

C50.01u

C627p

L2

R1560p

R222k

R43.3k

R322k

VT2C380

R5430

R6470

C7100p

R710k

R810k

C80.1u

L34.7u

R10200

C140.01u

C150.01u

G1455k

R11*

Left

Right

Back

For

VT1VCC2

SI

C16 470p

C90.1u

C17330p

C184700p

R12 2.2MR14

2.2k

R13 2.2M

R15 2.2k

C19 0.1u

R162.2k

VCC2

FORWD1

BACKWD 2

RIGHT3

LEFT4

GND 5

VT26

VT17

VO2 8

VI29

VO1 10VI111

FC12

SI13

VDD14

OSCO15

OSCI16

SRV17

PC18

F119

F220

IC1

PT8A996

R175k

C20

150p

R185k

FeedBack

SI

R19

2k

R23300

R24300

R290.2

VT3IRFZ48N

VT4

IRFZ48N

VT5

IRF4905

VT6IRF4905

C100.1u

VT78050 VT8

8050VT98050 VT10

8050

R25300

R202k

R26300

BackForR303k

R313k

VT1

M1

R32110

C21100uC11

0.1u

C120.1u

C22470u

VCC2 L422u

D1NJM431

R910k

R3316k

B1

3.6v

SW1

B2

3.6v

VCC1

VCC1

VCC2

F1 Function Loading

F2 Function Loading

VT118050

VT128050

VT13BD237

VT14BD237

R212k

R27300

R28300

R22

2k

VT15BD238

VT16BD238

C130.1u

Left Right

M2

VCC1

R34

1.3kC23

4.7u

C24

150p


Page 27


G1

455k

R1

0~5k

Left

Right

Back

For

VT1VCC2

SI

C1

0.1u

C4330p

C54700p

R2 2.2M

R32.2k

VCC2

FORWD1

BACKWD 2

RIGHT 3

LEFT 4

GND5

VT2 6

VT1 7

VO2 8

VI29

VO1 10VI111

OFFSET12

SI13

VDD14

OSCO15

OSCI16

SRV17

PC18

F119

F220

IC1

PT8A996

R45k

C6

150p

R55k

FeedBack

SI

VT18050

VT28050

VT7BD237

VT8BD237

R62k

R10300

R11300

R7

2k

VT9BD238

VT10BD238

C20.1u

Left Right

M1Motor1

R82k

R12300 R13

300

R160.2

VT11IRFZ48N

VT12

IRFZ48N

VT13IRF4905

VT14IRF4905

C30.1u

VT38050 VT4

8050VT58050 VT6

8050

R14300

R92k

R15300

BackForR173k

R183k M2

Motor2

R19110

C7100uC8

0.1u

C90.1u

C10

470u

VCC2 L122u

D1NJM431

R2010k

R2116k

B13.6v

SW1

Switch

B23.6v

VCC1

VCC1

VCC1

VCC2

F1 Function Loading

F2 Function Loading

R226.8k

R232.7k

R25120

R26220

C1127p

C120.01u

C150.01u C17

20pC14680p

C160.01u

C183-10p

C190.047u

C203.3u

C21

180pL2

5.1u

T11.2u

T32u

L32.2u

A1

G227M

T2 FL1455k

1

3

5 6

78

1011

13PT8A201WVT159018

VCC2

VCC2

70

827

D41N60

D31N60

IC2

R27510

VT1 R28

1.3kC22

47u

D61N4148

C23

150p

D21N60

D51N60

R242.2k

C13 0.1u

T1 T2

6:10


Documents

Digital proportional Remote Controller