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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Features
* 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
General Description
The PTA977P (or 977W) and PT8A978P (or 978LW) provide a complete control functions to the remotecontrolled 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. There is an internal oscillator in the PT8A977P/977W
Ordering Information
Pa r t No. PT8A977P PT8A977W PT8A978P PT8A978LW Pa ck a ge 14-pin DIP 14-pin SOIC 16-pin DIP 16-pin SOIC
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.
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Block Diagram
Block Diagram of 977P/977W
OFF OSCI OSCO Right Left Turbo Forward Backward Input Circuit Encoding Circuit Output Circuit SO SC Timing Generator 4 Minutes Counter
Oscillator
PC
Block Diagram of 978P/978LW
OSCI Oscillator OSCO Timing Generator Latch Output Circuit Signal Sample & Fault-Tolerant Check VO1 Control Logic LD RD Right Left Turbo Forward Backward Decoding Circuit SI Amp.
VI1
Amp.
VI2
Amp.
VO2
Pin Configuration
PT8A977P/977W 14-Pin DIP/14-Pin SOIC
Right Test GND Backward Forward Turbo SC 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Left OFF OSCI OSCO PC VCC SO
PT8A978P/978LW 16-Pin DIP/16-pin SOIC
VO2 GND SI OSCI OSCO Right Left RD 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/977W/978P/978LW 5-Function Remote Controller
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Pin Description
Pin Description of 977P/977W Pin No. Pin Name
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Right Test GND Backward Forward Turbo SC SO Vcc PC OSCO OSCI OFF Left Description With Pull-up resistor, rightward function selected if this pin connected to GND. With Pull-up resistor, this pin is used for testing mode. Negative power supply With Pull-up resistor, backward function selected if this pin connected to GND. With Pull-up resistor, forward function selected if this pin connected to GND. With Pull-up resistor, turbo function selected if this pin connected to GND. Output pin of the encoding signal with carrier frequency Output pin of the encoding signal without carrier frequency Positive power supply Power control output pin Oscillator output pin Oscillator input pin With Pull-up resistor, this pin is used to shut down the external power supply. With Pull-up resistor, leftward function selected if this pin connected to GND.
Pin Description of 978P/978LW
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name VO2 GND SI OSCI OSCO Right Left RD LD Backward Forward Turbo Vcc VI1 VO1 VI2 Description Output pin for the amplifier 2 Negative power supply Input pin of the encoding signal Oscillator input pin Oscillator output pin Rightward output pin Leftward output pin With Pull-up resistor, rightward function disabled if this pin connected to GND. With Pull-up resistor, leftward function disabled if this pin connected to GND. Backward output pin Forward output pin Turbo output pin Positive power supply Input pin for the amplifier 1 Output pin for the amplifier 1 Input pin for the amplifier 2
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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)
W1
W1: 1kHz 50% Duty Cycle Typical
W2
W2: 500Hz 75% Duty Cycle Typical
Word Format
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
2
3 End Codes
14 15
9ms
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Encoding Input and Decoding Result
Number of Function Codes (n) W1 4 10 16 22 28 34 40 46 52 58 64 Decoding Results End Code Forward (Pulse) Forward (High level) Turbo Forward (High level) & Left Forward (High level) & Right Backward Backward & Right Backward & Left Left Right
PC Output Timing of 977P/977W
VCC OFF PC 8s Note: Pins 1, 4, 5, 6 and 14 are High.
VCC OFF PC
8s
VCC Press Function buttons PC
8s
8s
4 Minutes
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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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/977W
Parameters VCC ICC ISTB VIL VIH IIL IIH II IOL IOH Description Operating Voltage Supply Current Stand-by Current Input Low Voltage Input High Voltage Input Low Current Input High Current Input Current Output Low Current Output High Current Pin 7, 8, 10 Pin 11 Pin 1, 4, 5, 6, 13, 14 Pin 1, 4, 5, 6, 13, 14 Pin 12 Output unloaded OFF State Guaranteed Logic LOW level Guaranteed Logic HIGH level VIL = 0V, ON state VIH = 4V, ON state VIH = 0 ~ 4V, ON state VOUT = 0.5 V VOUT = 3.5 V VOUT = 3.5 V 150 -1.0 -200 - 800 3.0 -60 10 10 Test Condition Min. 2.5 Type 4.0 Max. 5.0 100 5 0.8 Units V uA uA V V uA uA uA uA mA uA
Note: Over the Operating Rating, 0C TA 70C, VCC = 4V DC Electrical Charateristics of 978P/978LW
Parameters VCC ICC ISTB VIL VIH IIL IIH II IOL IOH Description Operating Voltage - 978P Operating Voltage - 978LW Supply Current Stand-by Current Input Low Voltage Input High Voltage Input Low Current Input High Current Input High Current Input Current Pin 3, 8, 9 Pin 3 Pin 8, 9 Output unloaded OFF State Guaranteed Logic LOW level Guaranteed Logic HIGH level VIL = 0V, ON state VIH = 4V, ON state VIH = 4V, ON state VIH = 0 ~ 4V, ON state VOUT = 0.5 V VOUT = 0.5 V VOUT = 3.5 V VOUT = 3.5 V 200 2 -200 -500 3.0 -60 60 10 10 850 - 850 Test Condition Min. 2.5 2.0 Type 4.0 Max. 5.0 5.0 1 10 0.8 Units V V mA uA V V uA uA uA uA uA mA uA uA
Pin 14, 16 Pin 1, 5, 15 Output Low Current Pin 6, 7, 10, 11, 12 Pin 1, 5, 15 Pin 6, 7, 10, 11, 12
Output High Current
Note: Over the Operating Rating, 0C TA 70C, VCC = 4V
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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AC Electrical Characteristics
AC Electrical Characteristics of 977P/977W
Parameters fOSC fmax-fmin tFUN tSTA fCSC tOFF Test Condition Description TA= 25C, R = 200 kW Oscillator Frequency * Oscillator Frequency Fluctuation - 977P/977W TA=25C, VCC= 2.5 ~ 5V Cycle Time of Function Code Cycle Time of Start Code Carrier Frequency of SC Pin Time of Auto-Power-Off ** 0 fOSC = 1 2 to 154 kHz 0 fOSC = 1 2 to 154 kHz fOSC = 1 2 to 154 kHz 0 Pins 1, 4, 5, 6 and 14 are High. Any of pins 1, 4, 5, 6 or 14 is Low. Min. 12 0 08 . 1.6 51 64 . 32 . Type 18 2 1 2 64 8 4 Max. 14 5 1 5 12 . 2.4 77 9.6 4.8 Units k Hz kH z ms ms kHz s min.
Note: Over the Operating Rating, 0C TA 70C, 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%. ** 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= 25C, R = 200 kW TA=25C, VCC=2.5 ~ 5V TA=25C, VCC=2.0 ~ 5V Guaranteed Effective Decoding fOSC = 128 kHz fOSC = 128 kHz 300 07 .5 1.5 1 2 12 .5 2.5 Min. 12 0 Type 18 2 Max. 14 5 1 5 1 0 Units kH z kH z kH z mV ms ms
Note: Over the Operating Rating, 0C TA 70C, 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%.
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Application Circuits
Typical Application of PT8A977P/977W For Transmit Circuit With 9V Battery
B1 9V
A1 ANTENNA
R11 10M
6.8u
V5 8550
R8 3.9K
L3
C2 150
C1 100
L4
V6 9013
L2 2.2u
C4 150
V3 LED
R2 4.7K
V1 9014
C8 .02u
C3 47
C9 68 R10 1K R4 6.8K C7 68
R5 33K
R1 100
C6 .02u
R9 330
L1
2.2u
V4 4.7V
C11 4.7u
V7 4148
R3 220K
CR1 27.145
C12 .01u
R12 1OM
PT8A977P
R7 200K
POWER
OFF
S5
S6
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1
Left
Right
S1
RIGHTB LEFTB 14
2
OFF
Test
3
TESTB
GND
OSCI
OSCI
OFF
GND
4
OSCO
Backward
S2
BACK
5
PC
Forward
S3
FOR OSCO PC 13 12 11 10
6
VCC
Turbo
S4
TURBOB VDD 9
7
SO
SC
V2 9014
SC
R6 100
SO
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Typical Application of PT8A978P/978LW For Receive Circuit With Five Functions
12V
9V
S1
R14 220
V10 9013
C19 .1u
R17 100
V7 9013
R18 330
R25 1K
R11 10
V14 8550
C18 100u
V9 8550 V5 8550
C17 .02U
M2
V6 8050
R20 100
C16 .02u
M1
V13 8550
R12 510
VD1 4.2V
V3 8050
R13 220
V11 9013
C14 .01u
V4 8550
R15 330
9 10
R24 1K
C13 4.7u
R16 100
R21 1K R7 2.2K
V2 9013
C12 100u
11 12 13
PT8A978P
C15 .01u
R23 1K
V8 9013
C8 470
R10 4.3K
14 15 16
L2
R3 2.2K C7 .1u
R4 2.2M
C6 18
A1
C5 .02u
V1 C1815
R2 180K
C4 4.7u
C9 .1u
C1 4
C2 47
L1 2.2u C3 3000
R1 1K
R6 2.2M
R5 2.2K
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C10 30
9
1
VI2
16
VO2
2
VO1
15
GND
1
C11 1000
3
VI1
14
SI
4
V CC
13
OSCI
4 3 2
R8 200K
5
Turbo
12
OSCO
6
Forward
11
Right
7
Backward
10
Left
7 6 5
R22 1K
8
LD
9
RD
8
R9 330
V12 8050
V15 8050
R19 330
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Mechanical Diagram of 14-pin SOIC
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Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller
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Mechanical Diagram of 16-pin SOIC
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Data Sheet PT8A977P/977W/978P/978LW 5-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. PT0074(10/01)
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