Document
Data Sheet PT8A9702/973/973L/974/974L 8-Direction Remote Controller
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Features
• The PT8A9702 works as the encoder and the PT8A973/974/973L/974L works as the decoder • 8-direction control • Operation power supply for PT8A9702: 3V to 12V (with series resistor) • Auto power-off if no key pressed (PT8A9702) • Motor current limit to meet toy safety standard HD271 (PT8A973/974/973L/974L) • Low operating current • On-chip oscillator with an external resistor • On-chip reversing amplifiers • Built-in 3.8V Zener (9702), 3.7V Zener (Vz) (973/974) and 3.1V Zener (Vz) (973L/974L)
• Few external components needed • Pin to pin compatible with TX6/RX6
General Description
The PT8A9702P works as encoder, it can provide 8direction remote control for toy car application with PT8A973/973L/PT8A974/974L together. Input 8direction named F, FL, L, BL, BR, R, FR, and B they are combined with F, L, B, and R four signals. In decoder side, use output signal Left & Right to drive Right Motor, and use For & Back to drive Left Motor. Their detail relations please see truth table.
Ordering Information
Device Na me Part No. Package E n cod er PT8A9702P 16-pin PDIP PT8A973P PT8A973LP Decod er PT8A974P PT8A974LP 20-pin PDIP
18-pin PDIP
Block Diagram
Block Diagram of PT8A9702
f0/2 OSCI OSCO f0
Oscillator
Timing Generator
SC
MUX
SO
m o c . u 4 t e e h s a t a .d w w w
Forward Backward Left Right F1 F2 F3/F4
PT0097(11/02)
Latch Circuit
Logic Control
PC
VCC
Counters
1
Ver:2
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Data Sheet PT8A9702/973/973L/974/974L 8-Direction Remote Controller
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Block Diagram of PT8A973/973L
OSCI OSCO SI
Oscillator
Timing Generator Decoding Circuit
Counter
VCC
Amp
PLA
VI1 VI2 LRTD VT1
VO1 VO2
Control Logic
Latch Circuit
Right Left Backward Forward Turbo F1 F2
Block Diagram of PT8A974P/974LP
OSCI OSCO SI
Oscillator
Timing Generator Decoding Circuit
Counter
VCC
Amp
PLA
Right Left Backward Forward Turbo F1 F2 F3 F4
VI1 VI2 VT1 VT2
VO1 VO2
VT Detector
Latch Circuit
Pin Configuration
PT8A9702P 16-Pin PDIP Right NC GND Backward Forward NC SC F3/F4 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Left F1 OSCI OSCO PC VCC SO F2 VO2 GND SI OSCI OSCO F1 Right F2 Left PT8A973P/973LP 18-Pin PDIP 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 Top View
PT0097(11/02)
PT8A974P/974LP 20-Pin PDIP VI2 VO1 VI1 VCC Turbo Forward Backward LRTD VT1 VO2 GND SI OSCI OSCO F1 Right F2 Left VT1 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VI2 VO1 VI1 VCC Turbo F4 Forward F3 Backward VT2
2
Ver:2
Data Sheet PT8A9702/973/973L/974/974L 8-Direction Remote Controller
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Pin Description
Pin Description of PT8A9702
P in No 1 2, 6 3 4 5 7 8 9 10 11 12 13 14 15 16
P in /Pa d Na me
Right NC GND Backward Forward SC F3/F4 F2 SO VCC PC OSCO OSCI F1 Left
Typ e
I GND I I O I I O P O O I I I
Descr ip t ion Rightward function selected if this pin connected to GND No connection Ground Backward function selected if this pin connected to GND Forward function selected if this pin connected to GND Output pin of the encoding signal with carrier freqency Able to toggle between Function 3 and Function 4 if connected to GND Function 2 selected if connected to GND Output pin of the encoding signal without carrier freqency Power supply Power control output pin Oscillator output pin Oscillator input pin Function 1 selected if connected to GND Leftward function selected if this pin connected to GND
Truth Table
Forward 0 0 1 1 1 1 1 0
Input of 9702 Backw ard Right 1 1 1 1 1 1 0 1 0 1 0 0 1 0 1 0
Left 1 0 0 0 1 1 1 1
O utput of 973/973L/974/974L Forward Backw ard Right Left H L H L L L H L L H H L L L L H L H L H L H L L H L L H H L L L Left M otor Right M otor
* N ote: 0 -- active, 1 -- inactive.
PT0097(11/02)
3
Ver:2
Data Sheet PT8A9702/973/973L/974/974L 8-Direction Remote Controller
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Pin Description of PT8A973/973L
P in No 1, 17 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16, 18 P in /Pa d Na me VO2, VO1 GND SI OSCI OSCO F1 Right F2 Left VT.