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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Features
* The PT8A9701P works as the encoder and the PT8A974P/974LP works as the decoder * Nine output pins, 5 for forward, backward, left, right and turbo functions, and 3 functional keys * Operation power supply for PT8A9701: 3V to 12V (with series resistor) * Auto power-off if no key pressed (PT8A9701P) * Motor current limit to meet toy safety standard HD271 (PT8A974P/974LP) * Low operating current * On-chip oscillator with an external resistor * On-chip reversing amplifiers * Built-in 3.7V Zener (Vz) (PT8A974P) and 3.1V Zener (Vz) (PT8A974LP) * Few external components needed
General Description
The PT8A9701P and PT8A974P/974LP is a pair of CMOS LSIs designed for remote controlled toy car application. They have eight control keys for controlling the corresponding motion, i.e., forward, backward, left, right, turbo and 3 functional keys, of the remote controlled car. They also have `Forward (Backward)' and `Turbo' combination application.
Ordering Information
Device Na m e Part No. Package E n cod er PT8A9701P 16-pin PDIP Decod er PT8A974P PT8A974LP
20-pin PDIP
Block Diagram
Figure 1. Block Diagram of PT8A9701P
f0/2 OSCI OSCO
Oscillator
Timing Generator
SC
MUX
SO
Forward Backward Left Right Turbo F1 F2 F3/F4
Latch Circuit
Logic Control
PC
VCC
Counters
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Figure 2. Block Diagram of PT8A974P/974LP
OSCI OSCO SI
Oscillator
Timing Generator Decoding Circuit
Counter
Amp
PLA
Right Left Backward Forward Turbo F1 F2 F3 F4
VI1 VI2 VT1 VT2 VCC
VO1 VO2
VT Detector
Latch Circuit
Package and Pin Assignment
PT8A9701P 16-Pin PDIP
PT8A974P/974LP 20-Pin PDIP
Right NC GND Backward Forward Turbo 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 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
Top View
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Pin Description
Table 1. Pin Description of PT8A9701P
P in No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
P in Na me
Right NC GND Backward Forward Turbo SC F3/F4 F2 SO VCC PC OSCO OSCI F1 Left
Typ e
I GND I 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 Turbo 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
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Table 2. Pin Description of PT8A974P/974LP
P in No 1, 19 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18, 20
P in Na me VO2, VO1 GND SI OSCI OSCO F1 Right F2 Left VT1 VT2 Backward F3 Forward F4 Turbo VCC VI1,VI2
Typ e O GND I I O O O O O I I O O O O O P I Output pins of amplifiers 1 and 2 Ground Input pin for encoded signal Oscillator input pin Oscillator output pin F1 function output pin Rightward output pin F2 function output pin Leftward output pin
Descr ip t ion
Auto shut-off input pin: If voltage on VT1 pin is over 0.095VCC for 3 sec, all outputs will be shut off automatically. Auto shut-off input pin: If voltage on VT2 pin is over 0.095VCC for 3 sec, all outputs will be shut off automatically. Backward output pin F3 function output pin Forward output pin F4 function output pin Turbo output pin Power supply Input pins of amplifiers 1 and 2
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Functional Description
In normal operation without `Turbo', forward (backward) output pin of the decoder PT8A974P/974LP sends out a 60Hz signal. In operation with `Forward (Backward)' and `Turbo' combined, the output signal will be completely high. This function is depicted in Table 3.
Coding Method
Each trigger pin is triggered by corresponding bit of data in format of "1". The data string is 16-bit and divided to four segments, i.e., Start Code, Data Code, Parity Code and End code, where Start Code = 11110. Data Code = F B T R L F1 F3 F4 F2
F = Forward R = Right F2 = Function 2 B = Backward L = Left F3 = Function 3 T = Turbo F1= Function 1 F4 = Function4
Timing Diagram
Data Format
See Figure 4.
Parity Code = Even parity check result End Code is for data latch. Data code can be any combination of F, B, T, R, L, F1, F2, F3 and F4 except F&B and R&L.
Table 3
O u t p u t fr om P T 8A974P /974L P I n p u t t o P T 8A970P Forward Forward Backward Forward + Turbo Backward + Turbo 60Hz Low High Low Backward Low 60Hz Low High Turbo Low Low High High
Figure 4. Data Format
"1"
Frequency: 500Hz, Duty Cycle: 3/4
"0"
Frequency: 500Hz, Duty Cycle: 1/4
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested)
Maximum Ratings PT8A9701P
Storage Temperature ....................................................................................................................................... -25oC to +85oC Ambient Temperature with Power Applied ........................................................................................................ 0oC to +70oC Supply Voltage to Ground Potential (Inputs & VCC Only) ................................................................................... -0.5 to +5.5V Supply Voltage to Ground Potential (Outputs & D/O Only) ............................................................................... -0.5 to +5.5V DC Input Voltage ............................................................................................................................................... -0.5 to +5.5V DC Output Current ....................................................................................................................................................... 20mA Power Dissipation ...................................................................................................................................................... 500mW
Maximum Ratings PT8A974P
Storage Temperature ....................................................................................................................................... -25oC to +85oC Ambient Temperature with Power Applied ........................................................................................................ 0oC to +70oC Supply Voltage to Ground Potential (Inputs & VCC Only) ................................................................................... -0.5 to +5.5V Supply Voltage to Ground Potential (Outputs & D/O Only) ............................................................................... -0.5 to +5.5V DC Input Voltage ............................................................................................................................................... -0.5 to +5.5V DC Output Current ....................................................................................................................................................... 30mA Power Dissipation ...................................................................................................................................................... 500mW
Maximum Ratings PT8A974LP
Storage Temperature ....................................................................................................................................... -25oC to +85oC Ambient Temperature with Power Applied ........................................................................................................ 0oC to +70oC Supply Voltage to Ground Potential (Inputs & VCC Only) ................................................................................... -0.5 to +5.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ............................................................................... -0.5 to +5.0V DC Input Voltage ............................................................................................................................................... -0.5 to +5.0V DC Output Current ....................................................................................................................................................... 30mA Power Dissipation ...................................................................................................................................................... 500mW 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 conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Recommended Operation Conditions
Table 4. Recommended Operation Conditions
Sym ICC VIH VIL FOSC TA
Descr ip t ion Supply Current for PT8A974P Supply Current for PT8A974LP Input HIGH Voltage Input LOW Voltage Oscillator Frequency Operation Temperature
Min
Typ
Ma x 30 30
Un it s mA mA V
0.7VCC 0 109 0 128 0.3VCC 146 70
V kHz
O
C
DC Electrical Characteristics
Table 5. DC Electrical Characteristics of PT8A9701P
Sym VZ Descr ip t ion Voltage of Zenner Output HIGH Current - PC Pin IOH Output HIGH Currentl SC and SO Pins Output HIGH Current OSCO Pin Output LOW Current - PC Pin IOL Output LOW Currentl SC and SO Pins Output LOW Current OSCO Pin Input HIGH Current Forward, Backward, Left, Right, Turbo, F1, F2, F3/F4 and OSCI Pins Input LOW Current Forward, Backward, Left, Right, Turbo, F1, F2 and F3/F4 Pins Input LOW Current - OSCI Pin VOL = 0.5V VOH = VCC-0.5V Test C on d it ion s IZ = 2~30mA Min 3.4 -3 -3 -200 2 2 200 3 3 1000 Typ 3.7 -5 -5 -1000 Ma x 4.0 Un it s V mA mA uA mA mA uA
IIH
VIH = VCC
1
uA
-20 VIL = 0V
-40
-100 -10
uA uA
IIL
Note: These specifications apply for VCC = 3.5V and TA = 25 C, unless otherwise specified.
O
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Table 6. DC Electrical Characteristics of PT8A974P/974LP
Sym Descr ip t ion Output HIGH Current VO1, VO2 and OSCO Pins IOH Output HIGH Current Forward, Backward, Left and Right Pins Output HIGH Current Turbo, F1, F2, F3 and F4 Pins Output LOW Current VO1, VO2 and OSCO Pins IOL Output LOW Current Forward, Backward, Left, Right and Turbo Pins Output LOW Current F1, F2, F3 and F4 Pins Input HIGH Current - OSCI, VI1, VI2 and SI Pins IIH Input HIGH Current - VT1 and VT2 Pins Input LOW Current - OSCI, VT1, VT2, VI1, VI2 and SI Pin Over-Current Limit VT1 and VT2 Pins for 974P VT Over-Current Limit VT1 and VT2 Pins for 974LP Voltage of Zenner - VCC Pin of PT8A974P VZ Voltage of Zenner - VCC of PT8A974LP IZ = 2~30mA 2.8 3.1 3.4 V 0.25 3.4 3.7 0.35 4 V V VIN = VCC 50 VIN = 0V 0.30 -10 0.40 uA uA V VOL = 0.5V VOH = VCC-0.5V Test C on d it ion s Min -300 Typ Ma x -800 Un it s uA
-3 mA -3 200 1000 uA
2
3 mA
2
3 10 uA
IIL
Note: These specifications apply for TA = 25C, VCC = 3.5V (974P), VCC = 3.0V (974LP), unless otherwise specified.
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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AC Electrical Characteristics
Table 7. AC Electrical Characteristics of PT8A9701P
Sym fOSC (Note2) tFUN tSTA fCSC tOFF VCC ICC Descr ip t ion Oscillator Frequency Period of Function Code Start-Code Period Carrier Frequency Auto-off Time Power Supply Range Supply Current Test C on d it ion s Rf = 200k fOSC = 128kHz fOSC = 128kHz fOSC = 128kHz fOSC = 128kHz Output Unloaded 3 Min 109 1.7 1.7 Typ 128 2 2 64 2 9 12 30 Ma x 146 2.3 2.3 Un it s kHz ms ms kHz s V mA
Notes: 1. These specifications apply for VCC = 3.5V and TA = 25OC, unless otherwise specified. 2.The frequency of standard samples is tested on standard testing-board.
Table 8. AC Electrical Characteristics of PT8A974P/974LP
Sym fOSC (Note2) tFUN tSTA ICC Descr ip t ion Oscillator Frequency Period of Function Code Start-Code Period Supply Current Test C on d it ion s Rf = 200k fOSC = 128kHz fOSC = 128kHz Output Unloaded Min 109 1.7 1.7 Typ 128 2 2 Ma x 146 2.3 2.3 30 Un it s kHz ms ms mA
Notes: 1. These specifications apply for TA = 25C, VCC = 3.5V (974P), VCC = 3.0V (974LP), unless otherwise specified. 2. The frequency of standard samples is tested on standard testing-board.
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Figure 5. Typical Application Circuit of PT8A9701P
9V B1
A1 ANTENNA
L1 6.8uH
SW
L2 7 1/4T
C1 100uF
C8 150P
C9 100P
L3 2.2uH
C3 47P
Q2 C945
C5 47
R8 100
C4 0.02u
R3 3.3K
C6 47P
D1 LED
L4 2.2uH
C7 47P
CR1 27.145MHz
C2 203
9 10 11 12
F2 SO Vcc PC OSCO OSCI F1 Left
F3/F4 SC Turbo Forward Backward GND Test Right
8 7 6 5 4 3 2 1
R2 200K
13 14 15
F1
16
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R
L
B
F
T
F3/F4 F2
PT8A9701P
R4 120K
R1 470
Q1 C945P
R5 100
6.8K
R6
R7 33K
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Figure 6. Typical Application Circuit of PT8A974P
SW
B1 6V
R24 1K
Q15 B772
Q17 H1815
Q19 B772 M2
Q18 H1815
R26 220
R23 1K
R18 10K
Q20 D882
104
Q16 D882
R17 10K
R27 220
R28 220
R15 10K
R20 1K Q5 M3 8550 H1815 Q8 Q3 8550 Q7 H1815 R16 10K R2 330
11 12 13 14
R22 1K
Q9 B772
Q11 H1815
Q10 D882
Q13 B772 M1
R1
330
104
C12 220uF
Q12 H1815
Q14 D882
C10 104
R25 220
R21
1K
VT2 Backward F3 Forward
15 16
VT1 Left F2 Right F4 Turbo F1 OSCO
10 9 8 7 6 5
R7 3.3k
C7 104
C3 47P
17
R9 2.2k
Vcc
OSCI
4 18 3
ANTENNA
C9 R10 470P 2.2M
VI1
SI
C2 103
C1 5P
7T
19 20
VO1
GND
2 1
180K C6 4.7uF
VI2
VO2
R12
C5 47P
Q1 C380
2.2K
PT8A974
R6 R4 820 C8 104 R11 2.2M
27MHz
4.7uH
L1
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C4 472
2.2K
L2
R5
R8 C11 200K 222
R19 1K
R14 10K
Q4 8050
104
Q6 8050
R13 10K
R3 330
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Data Sheet PT8A9701P/974P/974LP 8-Function Remote Controller
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Notes
Pericom Technology Inc.
Email: support@pti.com.cn China: Asia Pacific: U.S.A.: Web Site: www.pti.com.cn, www.pti-ic.com No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181 Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667 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 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 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. PT0090(09/02)
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