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8A978P PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 8A978P
기능 PT8A978P
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8A978P 데이터시트, 핀배열, 회로
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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Features
General Description
• PT8A977P/977W works as encoder and
PT8A978P/978LW works as decoder
• Five pins for five control functions
• Operating power-supply voltage: 2.5V to 5.0V
(977P, 977W, 978P), 2.0V to 5.0V (978LW)
• Auto-power-off if no press on any button in 8s or
continuously press on any button over 4 minues
• Press on any button as wake up (977P, 977W)
• Manual-power-off with OFF button
• One output pin used for external power control (977P,
977W)
• On-chip oscillator with an external resistor
• On-chip reversing amplifiers (978P, 978LW)
• Low operating current
• Few external components needed
• Package: 14-pin DIP, 14-pin SOIC, 16-pin DIP
and 16-pin SOIC
The PTA977P (or 977W) and PT8A978P (or 978LW)
provide a complete control functions to the remote-
controlled toy. The PT8A977P/977W has five input
pins corresponding with the five function buttons i.e,
forward, backward, rightward, leftward and turbo. The
encoding circuit in the PT8A977P/977W sends digital
codes to the two output pins SO and SC. The digital
codes correspond to the definite function buttons or
their combinations. The SO and SC outputs are used
in wireless and infra-red applications respectively.
The PT8A978P (or 978LW) has five output pins
corresponding with the five actions. The received
signals are amplified by the three-stage amplifier, and
then the appropriate amplified signals are sampled,
fault-tolerantly checked and decoded to control the
actions of the remote-controlled toy.
Ordering Information
Par t No.
Package
PT8A977P
14-pin DIP
PT8A977W
14-pin SOIC
PT8A978P
16-pin DIP
PT8A978LW
16-pin SOIC
There is an internal oscillator in the PT8A977P/977W
and 978P/978LW respectively. By adding an external
resistor conveniently, the oscillator will be
constructed. The oscillator frequency can be adjusted
by the external resistor. The relative error between
the frequencies of the two on-chip oscillators in the
PT8A977P/977W and PT8A978P/978LW must be
less than ±25%.
The auto-power-off function is achieved by an internal
counter. The PC output is used to control on/off state
of the external power supply. Pressing OFF button
can also shut down the power supply. Press on any
function button will wake up the chip promptly.
PT0074(10/01)
1
Ver:1
Free Datasheet http://www.datasheet-pdf.com/




8A978P pdf, 반도체, 판매, 대치품
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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Code Format
(W1 is used for function codes, W2 for start codes)
Word Format
W1 W1: 1kHz 50% Duty Cycle Typical
W2 W2: 500Hz 75% Duty Cycle Typical
Start Code: 4W2
1 Word
Function Code: n ´ W1
Encoding and Decoding Timing
W2, W2, W2, W2, (n)xW1, W2, W2, W2, W2, (n)xW1, W2, W2, W2, W2, (n)xW1, W2, W2, W2, W2, (n)xW1,
Press Any Button
on PT8A977P/977W
Encoding Output
from PT8A977P/977W
1st word 2nd word
last word
Function Codes
Decoding Output
from PT8A978P (or
978LW)
9ms
1 23
14 15
End Codes
9ms
PT0074(10/01)
4
Ver:1
Free Datasheet http://www.datasheet-pdf.com/

4페이지










8A978P 전자부품, 판매, 대치품
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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AC Electrical Characteristics
AC Electrical Characteristics of 977P/977W
Parameters
Description
Test Condition
Min. Type Max. Units
fOSC Oscillator Frequency *
TA= 25°C, R = 200 kW
102 128 154 kHz
fmax-fmin Oscillator Frequency Fluctuation - 977P/977W TA=25°C, VCC= 2.5 ~ 5V
tFUN Cycle Time of Function Code
fOSC = 102 to 154 kHz
15 kH z
0.8 1 1.2 ms
tSTA Cycle Time of Start Code
fOSC = 102 to 154 kHz
1.6 2 2.4 ms
fCSC Carrier Frequency of SC Pin
fOSC = 102 to 154 kHz
51 64 77 kHz
tOFF Time of Auto-Power-Off **
Pins 1, 4, 5, 6 and 14 are High.
6.4
Any of pins 1, 4, 5, 6 or 14 is Low. 3.2
8
4
9.6 s
4.8 min.
Note: Over the Operating Rating, 0°C £ T £ 70°C, V = 4V
A CC
* The relative error between the frequencies of the two on-chip oscillators in the PT8A977P (or 977W) and PT8A978P (or
978LW) must be less than ±25%.
** When adjust the external oscillator resistor, the auto-power-off time will vary relevantly.
AC Electrical Characteristics of 978P/978LW
Parameters
fOSC
fmax-fmin
VSI
tFUN
tSTA
Description
Oscillator Frequency *
Oscillator Frequency Fluctuation - 978P
Oscillator Frequency Fluctuation - 978LW
SI Pin Receive Sensitivity (VPP)
Cycle Time of Function Code
Cycle Time of Start Code
Test Condition
TA= 25°C, R = 200 kW
TA=25°C, VCC=2.5 ~ 5V
TA=25°C,
V =2.0
CC
~
5V
Guaranteed Effective Decoding
fOSC = 128 kHz
fOSC = 128 kHz
Min.
102
300
0.75
1.5
Type
128
1
2
Max.
154
15
10
1.25
2.5
Units
kH z
kH z
kH z
mV
ms
ms
Note: Over the Operating Rating, 0°C £ TA £ 70°C, VCC = 4V
* The relative error between the frequencies of the two on-chip oscillators in the PT8A977P (or 977W) and PT8A978P (or
978LW) must be less than ±25%.
PT0074(10/01)
7
Ver:1
Free Datasheet http://www.datasheet-pdf.com/

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부품번호상세설명 및 기능제조사
8A978

REMOTE CONTROLLER

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ETC
8A978P

PT8A978P

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