Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Features
in the PT8A977P sends digital codes to the two output pins SO and SC. The digital codes correspond to the
• PT8A977P works as encoder and PT8A978P
definite function buttons or their combinations. The
works as decoder
SO and SC outputs are used in wireless and infra-red
• Five pins for five control functions
applications respectively.
• Operating power-supply voltage: 2.5 to 5.0V
The PT8A978P has five output pins corresponding
• Auto-power-off if no press on any button in 8s or
with the five actions. The received signals are
continuously press on any button over 4 minues
amplified by the three-stage amplifier, and then the
• Press on any button as wake up (977P)
appropriate amplified signals are sampled, fault-
• Manual-power-off with OFF button
tolerantly checked and decoded to control the actions
• One output pin used for external power control (977P)
of the remote-controlled toy.
• On-chip oscillator with an external resistor
There is an internal oscillator in the PT8A977P and
• On-chip reversing amplifiers (978P)
978P respectively. By adding an external resistor
• Low operating current
conveniently, the oscillator will be constructed. The
• Few external components needed
oscillator frequency can be adjusted by the external
• Package: 14-pin DIP (977P) and 16-pin DIP (978P)
resistor. The relative error between the frequencies of the two on-chip oscillators in the PT8A977P and
General Description
PT8A978P must be less than ±25%. The PTA977P and PT8A978P provide a complete
The auto-power-off function is achieved by an internal
control functions to the remote-controlled toy. The
counter. The PC output is used to control on/off state
PT8A977P has five input pins corresponding with the
of the external power supply. Pressing OFF button
five function buttons i.e, forward, backward,
can also shut down the power supply. Press on any
rightward, leftward and turbo. The encoding circuit
function button will wake up the chip promptly.
Block Diagram Block Diagram of 977P OFF OSCI
Oscillator
Timing Generator
4 Minutes Counter
Input Circuit
Encoding Circuit
Output Circuit
OSCO
PC
Right Left Turbo Forward
SO SC
Backward
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Block Diagram of 978P
OSCI Timing Generator
Oscillator
Right
Latch
Left
OSCO
Output Circuit
Turbo Forward
SI
Amp.
Signal Sample & Fault-Tolerant Check
VI1
Amp.
VO1
VI2
Amp.
Backward Decoding Circuit
Control Logic
VO2
LD RD
Pin Configuration PT8A977P 14-Pin DIP Right Test GND Backward Forward Turbo SC
1 2 3 4 5 6 7
14 13 12 11 10 9 8
PT8A978P 16-Pin DIP VO2 GND SI OSCI OSCO Right Left RD
Left OFF OSCI OSCO PC VCC SO
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VI2 VO1 VI1 VCC Turbo Forward Backward LD
Top View
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Pin Description Pin Description of 977P Pin No. Pin Name
Description
1
Right
The rightward function will be selected, if this pin is connected to GND
2
Test
3
GND
This pin is used for testing mode Negative power supply
4 5
Backward
The backward function will be selected, if this pin is connected to GND
Forward
The forward function will be selected, if this pin is connected to GND
6
Turbo
7
SC
The turbo function will be selected, if this pin is connected to GND Output pin of the encoding signal with carrier frequency
8
SO
Output pin of the encoding signal without carrier frequency
9
Vcc
Positive power supply
10
PC
Power control output pin
11
OSCO
Oscillator output pin
12
OSCI
Oscillator input pin
13 14
OFF
This pin is used to shut down the external power supply
Left
The leftward function will be selected, if this pin is connected to GND
Pin Description of 978P Pin No. 1
Pin Name
Description
VO2
Output pin for the amplifier 2
2
GND
Negative power supply
3
SI
Input pin of the encoding signal
4
OSCI
Oscillator input pin
5
OSCO
Oscillator output pin
6
Right
7
Left
Rightward output pin Leftward output pin
8
RD
Rightward function disable, if this pin is connected to GND
9
LD Backward
Backward output pin
Forward
Forward output pin
Turbo Vcc
Turbo output pin
VI1 VO1
Input pin for the amplifier 1
15 16
VI2
Input pin for the amplifier 2
10 11 12 13 14
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Leftward function disable, if this pin is connected to GND
Positive power supply Output pin for the amplifier 1
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Code Format (W1 is used for function codes, W2 for start codes)
W1
W1: 1kHz 50% Duty Cycle Typical
W2
W2: 500Hz 75% Duty Cycle Typical
Word Format
Function Code: n × W1
Start Code: 4W2 1 Word
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 Encoding Output from PT8A977P
1 last word
1st word 2nd word
2
3
Function Codes
14 15 End Codes
Decoding Output from PT8A978P 9ms
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Encoding Input and Decoding Result Decoding Results
Number of Function Codes (n) W1 4 10
End Code
16 22
Forward (High level) Turbo
28
Forward (High level) & Left
34 40
Forward (High level) & Right
46
Backward & Right
52
Backward & Left
58 64
Left Right
Forward (Pulse)
Backward
PC Output Timing of 977P
VCC
VCC
OFF
OFF
PC
PC ≤ 8s
8s Note: Pins 1, 4, 5, 6 and 14 are High.
VCC Press Function buttons PC
8s
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested) Note: Storage Temperature ........................................................ -25oC to +85oC Stresses greater than those listed under MAXIMUM Ambient Temperature with Power Applied ...................... -10oC to +40oC RATINGS may cause permanent damage to the Supply Voltage to Ground Potential (Inputs & VCC Only) .... -0.5 to +6.0V device. This is a stress rating only and functional Supply Voltage to Ground Potential (Outputs & D/O Only) -0.5 to +6.0V operation of the device at these or any other condiDC Input Voltage ................................................................ -0.5 to +6.0V tions above those indicated in the operational secDC Output Current ........................................................................ 20mA tions of this specification is not implied. Exposure Power Dissipation ....................................................................... 500mW to absolute maximum rating conditions for extended periods may affect reliability.
DC Electrical Charateristics DC Electrical Charateristics of 977P Parameters
Description
Test Condition
Min.
Type
Max.
Units
2.5
4.0
5.0 100
V uA
VCC ICC
Operating Voltage
ISTB VIL VIH
Stand-by Current
OFF State
5
uA
Input Low Voltage Input High Voltage
Guaranteed Logic LOW level Guaranteed Logic HIGH level
0.5
V V
IIL IIH
Input Low Current Input High Current
30 10
uA uA
IOL
Output Low Current
IOH
Output unloaded
Supply Current
Output High Current
3.5
Pin 1, 4, 5, 6, 12, 13, 14 VIL = 0V, ON state Pin 1, 4, 5, 6, 12, 13, 14
VIH = 4V, ON state VOUT = 0.5 V
150
Pin 7, 8, 10
VOUT = 3.5 V
1.0
Pin 11
VOUT = 3.5 V
200
uA mA 800
uA
Max.
Units
Note: Over the Operating Rating, 0°C ≤ TA ≤ 70°C, VCC = 4V DC Electrical Charateristics of 978P Parameters VCC
Description
Test Condition
Operating Voltage
Min.
Type
2.5
4.0
5.0 1
V mA
10
uA
0.5
V V
60 10
uA uA
ICC
Supply Current
Output unloaded
ISTB
Stand-by Current
OFF State
VIL VIH
Input Low Voltage Input High Voltage
Guaranteed Logic LOW level Guaranteed Logic HIGH level
IIL IIH
Input Low Current Input High Current
Pin 3, 4, 8, 9, 14, 16 Pin 3, 4, 8, 9, 14, 16
VIL = 0V, ON state VIH = 4V, ON state
IOL
Output Low Current
Pin 1, 5, 15 Pin 6, 7, 10, 11, 12
VOUT = 0.5 V VOUT = 0.5 V
200 2
850
uA mA
IOH
Output High Current
Pin 1, 5, 15
VOUT = 3.5 V
200
850
uA
Pin 6, 7, 10, 11, 12
VOUT = 3.5 V
500
3.5
uA
Note: Over the Operating Rating, 0°C ≤ TA ≤ 70°C, VCC = 4V
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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AC Electrical Characteristics AC Electrical Characteristics of 977P Parameters
Description
fOSC
Oscillator Frequency *
Min.
Type
Max.
Units
TA= 25°C, R = 200 kΩ
Test Condition
102
128
154
κΗz
tFUN
Cycle Time of Function Code
fOSC = 102 to 154 kHz
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
tOFF
Time of Auto-Power-Off **
fOSC = 102 to 154 kHz
51
64
77
kHz
Pins 1, 4, 5, 6 and 14 are High.
6.4
8
9.6
s
Pins 1, 4, 5, 6 and 14 are Low.
3.2
4
4.8
min.
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 and PT8A978P must be less than ±25%. ** When adjust the external oscillator resistor, the auto-power-off time will vary relevantly. AC Electrical Characteristics of 978P Parameters fOSC
Description Oscillator Frequency *
Test Condition TA= 25°C, R = 200 kΩ
Min.
Type
Max.
Units
102
128
154
kΗz
VSI
SI Pin VPP Receive Sensitivity
Guaranteed Effective Decoding
tFUN
Cycle Time of Function Code Cycle Time of Start Code
fOSC = 128 kHz
0.75
1
1.25
ms
fOSC = 128 kHz
1.5
2
2.5
ms
tSTA
300
mV
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 and PT8A978P must be less than ±25%.
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Application Circuits
C2 150
C1 100
6.8u
L4
R5 33K C7 68
C3 47 SC
SO
8 9
VCC
VDD
TURBOB
10
PC
PC
Forward
11
OSCO
12
OSCI
13
OFF
14
Left
OSCI
S5
S2
PT8A977P
OSCO
TESTB
OFF
S6
S1
Test
2
GND
GND
3
BACK
Backward
4
R7 200K
FOR
RIGHTB
LEFTB
8
Right
1
OFF
5
POWER
Turbo
S3
R12 1OM
S4
SC
6
PT0069(29/03/01)
SO
7
C12 .01u
C11 4.7u
V7 4148
R3 220K
V4 4.7V
CR1 27.145
V2 9014
R9 330
L1
2.2u
R6 100
R4 6.8K
R10 1K
C8 .02u
C9 68
R2 4.7K
V1 9014
V3 LED
R1 100
L2 2.2u
V6 9013
C4 150
C6 .02u
L3
R8 3.9K
V5 8550
R11 10M
A1 ANTENNA
B1 9V
Typical Application of 977P For Transmit Circuit With 9V Battery
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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V10 9013
9V
R19 330
V14 8550
V12 8050
M2
R9 330
PT8A978P
R23 1K C8 470
VI2
VO2 R6 2.2M
R5 2.2K
C9 .1u
2
R22 1K
1 R7 2.2K
R4 2.2M
R3 2.2K C7 .1u
3
C10 30
L1 2.2u C3 3000
C2 47
R1 1K
C4 4.7u
R8 200K
R24 1K
V2 9013 C5 .02u
4
C11 1000
R16 100 V8 9013
16
R21 1K
R15 330
V4 8550
R13 220
V3 8050
V11 9013
V13 8550
M1
V6 8050
C17 .02U
V15 8050
R25 1K R18 330
R17 100 C16 .02u
R20 100 VD1 4.2V L2
SI GND
16
R2 180K
OSCI
VO1 15
V1 C1815
15
5
1
C18 100u
V9 8550 V5 8550
VI1
OSCO
14
C6 18
14
6
2
R12 510 C14 .01u
C12 100u
Right
3
V CC 13
C1 4
Turbo
7
4
12
12
R10 4.3K
Forward 11
C15 .01u
Left
5
11
8
6
A1
Backward 10
C13 4.7u
RD
9
10
13
PT0069(29/03/01)
LD
8
9
7
C19 .1u
V7 9013
R11 10
R14 220
S1
12V
Typical Application of 978P For Receive Circuit With Five Functions
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Data Sheet PT8A977P/978P 5-Function Remote Controller
PT Pericom Technology Inc.
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Notes
Pericom Technology Inc. Email:
[email protected]
Web Site: www.pti.com.cn
China:
No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181
Asia Pacific:
Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667
U.S.A.:
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. PT0069(29/03/01)
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