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PDF PT8A974P Data sheet ( Hoja de datos )
| Número de pieza | PT8A974P | |
| Descripción | (PT8A9701P / PT8A974P) 8-Function Remote Controller | |
| Fabricantes | Pericom Semiconductor Corporation | |
| Logotipo |  |
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Data Sheet
PT8A9701P/974P/974LP
8-Function Remote Controller
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Features
General Description
• 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
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
Name
Encoder
Decoder
Part No. PT8A9701P PT8A974P PT8A974LP
Package 16-pin PDIP
20-pin PDIP
Block Diagram
Figure 1. Block Diagram of PT8A9701P
OSCI
OSCO
Forward
Backward
Left
Right
Turbo
F1
F2
F3/F4
Oscillator
Timing
Generator
Latch
Circuit
Logic
Control
Counters
f0/2
MUX
PC
SC
SO
VCC
PT0090(09/02)
1
Ver:2
1 page  
Data Sheet
PT8A9701P/974P/974LP
8-Function Remote Controller
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Functional Description
Coding Method
In normal operation without ‘Turbo’, forward (backward) out-
put 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 func-
tion is depicted in Table 3.
Timing Diagram
Data Format
See Figure 4.
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
B = Backward
T = Turbo
R = Right
L = Left
F1= Function 1
F2 = Function 2 F3 = Function 3 F4 = Function4
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
Input to PT8A970P
Forward
Backward
Forward + Turbo
Backward + Turbo
Forward
60Hz
Low
High
Low
Output from PT8A974P/974LP
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
PT0090(09/02)
5
Ver:2
5 Page 
27MHz
ANTENNA
C5
47P
L1
4.7uH
C4
472
Q1
C380
R12
R4
820
180K
C6
4.7uF
C1
5P
L2
7T
C3
47P
C2 R9
103 2.2k
C7
104
R6
C8 2.2K
104
C9 R10
470P 2.2M
R7
3.3k
R11
2.2M
R5
R8
2.2K C11 200K
222
R1
C10
104
330
C12
220uF
SW
B1
6V
R25 Q13 Q9
R28
220
B772 M1 B772
220
R21 Q12
Q11
1K
H1815 104
H1815
R22
Q14
D882
R16
10K
Q10
D882
1K
R15
10K
R26 Q19 Q15
220 B772 M2 B772
R27
220
Q18
H1815
104
R23
1K Q20
R18 D882
10K
Q17
H1815
R24
1K
Q16
D882
R17
10K
R2 Q3 Q5 R3
330
8550 M3 8550
330
Q7
H1815
R19
1K Q4
Q8
H1815
104
Q6
R20
1K
R14 8050
10K
8050
R13
10K
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PT8A974P.PDF ] | |
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