Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
1
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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 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.
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.
.
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c
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g
a
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g
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k
c
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7
7
9
A
8
T
P
P
I
D
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i
p
-
4
1
W
7
7
9
A
8
T
P
C
I
O
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p
-
4
1
P
8
7
9
A
8
T
P
P
I
D
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-
6
1
W
L
8
7
9
A
8
T
P
C
I
O
S
n
i
p
-
6
1
Ordering Information
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
2
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Block Diagram of 978P/978LW
OSCI
OSCO
Right
Turbo
Forward
Backward
Oscillator
Timing
Generator
Decoding
Circuit
Latch
Output
Circuit
Signal Sample &
Fault-Tolerant
Amp.
Amp.
Amp.
SI
VI1
VI2
VO1
VO2
Left
LD
RD
Control
Logic
Check
Pin Configuration
Block Diagram
Block Diagram of 977P/977W
OSCI
OSCO
Right
Left
Turbo
Forward
Backward
Oscillator
Input
Circuit
Timing
Generator
Encoding
Circuit
4 Minutes
Counter
Output
Circuit
PC
SO
SC
OFF
Top View
VI2
Backward
GND
Forward
Turbo
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Right
Left
OSCI
OSCO
LD
V
CC
15
16
RD
VO2
SI
VO1
VI1
PT8A978P/978LW
16-Pin DIP/16-pin SOIC
OFF
Backward
GND
Forward
Turbo
Test
SC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Right
Left
OSCI
OSCO
PC
V
CC
SO
PT8A977P/977W
14-Pin DIP/14-Pin SOIC
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
3
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Pin Description of 978P/978LW
Pin No.
1
2
5
6
4
7
8
3
9
10
11
12
13
14
Pin Name
Description
15
16
VI2
VO2
SI
OSCI
OSCO
LD
RD
Right
Left
Backward
Forward
Turbo
V
cc
VI1
VO1
GND
Input pin for the amplifier 2
Output pin for the amplifier 2
Input pin of the encoding signal
Oscillator input pin
Oscillator output pin
With Pull-up resistor, leftward function disabled if this pin connected to GND.
With Pull-up resistor, rightward function disabled if this pin connected to GND.
Rightward output pin
Leftward output pin
Backward output pin
Forward output pin
Turbo output pin
Positive power supply
Input pin for the amplifier 1
Output pin for the amplifier 1
Negative power supply
Pin Description
Pin Description of 977P/977W
Pin No.
1
2
5
6
4
7
8
3
9
10
11
12
13
14
Pin Name
OFF
Backward
GND
Forward
Test
Turbo
SC
SO
V
cc
PC
OSCO
OSCI
Left
Right
Description
With Pull-up resistor, this pin is used to shut down the external power supply.
With Pull-up resistor, backward function selected if this pin connected to GND.
Negative power supply
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.
With Pull-up resistor, leftward function selected if this pin connected to GND.
With Pull-up resistor, rightward function selected if this pin connected to GND.
With Pull-up resistor, this pin is used for testing mode.
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
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
4
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Code Format
(W1 is used for function codes, W2 for start codes)
Word Format
Start Code: 4W2 Function Code: n
W1
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,
W1 W1: 1kHz 50% Duty Cycle Typical
W2 W2: 500Hz 75% Duty Cycle Typical
1st word 2nd word last word
Encoding Output
from PT8A977P/977W 1 2 3 14 15
Function Codes End Codes
Press Any Button
on PT8A977P/977W
9ms
9ms
Decoding Output
from PT8A978P (or
978LW)
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
5
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Encoding Input and Decoding Result
Turbo
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)
Forward (High level) & Left
Forward (High level) & Right
Backward
Backward & Right
Backward & Left
Left
Right
PC Output Timing of 977P/977W
Note: Pins 1, 4, 5, 6 and 14 are High.
8s
8s
V
CC
OFF
PC
PC
V
CC
OFF
V
CC
Press Function buttons
PC
8s 8s 4 Minutes
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
6
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested)
Storage Temperature ........................................................ -25
o
C to +85
o
C
Ambient Temperature with Power Applied ...................... -10
o
C to +40
o
C
Supply Voltage to Ground Potential (Inputs & V
CC
Only) .... -0.5 to +6.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) -0.5 to +6.0V
DC Input Voltage ................................................................ -0.5 to +6.0V
DC Output Current ........................................................................ 20mA
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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for ex-
tended periods may affect reliability.
DC Electrical Charateristics
DC Electrical Charateristics of 977P/977W
Note: Over the Operating Rating, 0C
T
A
70C, V
CC
= 4V
DC Electrical Charateristics of 978P/978LW
2.5 4.0 5.0 V
Parameters
Description
Test Condition Min. Type Max. Units
I
CC
Supply Current
Output unloaded 100 uA
V
IL
Input Low Voltage
Guaranteed Logic LOW level 0.8 V
I
IL
Input Low Current
-60 uA
I
OH
Output High Current
I
OL
Output Low Current
V
OUT
= 3.5 V -1.0 mA
V
OUT
= 0.5 V 150 uA
V
CC
Operating Voltage
I
STB
Stand-by Current
OFF State
5
uA
V
IH
Input High Voltage
Guaranteed Logic HIGH level 3.0 V
I
IH
Input High Current
Pin 1, 4, 5, 6, 13, 14 V
IH
= 4V, ON state 10 uA
Pin 1, 4, 5, 6, 13, 14 V
IL
= 0V, ON state
Pin 7, 8, 10
Pin 11
V
OUT
= 3.5 V -200 - 800 uA
Note: Over the Operating Rating, 0C
T
A
70C, V
CC
= 4V
Pin 6, 7, 10, 11, 12
2.5 4.0 5.0 V
Parameters
Description
Test Condition Min. Type Max. Units
I
CC
Supply Current
Output unloaded 1 mA
V
IL
Input Low Voltage
Guaranteed Logic LOW level 0.8 V
I
IL
Input Low Current
-60 uA
I
OH
Output High Current
I
OL
Output Low Current
V
OUT
= 3.5 V -200 - 850 uA
Pin 1, 5, 15 V
OUT
= 0.5 V 200 850 uA
V
CC
Operating Voltage - 978P
I
STB
Stand-by Current
OFF State
10
uA
V
IH
Input High Voltage
Guaranteed Logic HIGH level 3.0 V
I
IH
Input High Current
Pin 8, 9 V
IH
= 4V, ON state 10 uA
Pin 3, 8, 9 V
IL
= 0V, ON state
Pin 1, 5, 15
Pin 6, 7, 10, 11, 12
V
OUT
= 3.5 V -500 uA
V
OUT
= 0.5 V 2 mA
Operating Voltage - 978LW
2.0 5.0 V
I
I
Input Current
Pin 12 V
IH
= 0 ~ 4V, ON state 10 uA
Input High Current
Pin 3 V
IH
= 4V, ON state 60 uA
I
I
Input Current
Pin 14, 16 V
IH
= 0 ~ 4V, ON state 10 uA
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
7
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AC Electrical Characteristics
AC Electrical Characteristics of 977P/977W
Note: Over the Operating Rating, 0C
T
A
70C, V
CC
= 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
Note: Over the Operating Rating, 0C
T
A
70C, V
CC
= 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%.
Parameters
Description
Test Condition Min. Type Max. Units
f
OSC
Oscillator Frequency *
t
FUN
Cycle Time of Function Code
t
STA
t
OFF
Cycle Time of Start Code
Carrier Frequency of SC Pin
Time of Auto-Power-Off **
T
A
= 25C, R = 200 k
W 102 128 154 kH
z
f
OSC
=
102
to 154 kHz
0.8 1 1.2
ms
f
OSC
=
102
to 154 kHz 1.6 2 2.4 ms
f
OSC
=
102
to 154 kHz
51 64 77 kHz
Pins 1, 4, 5, 6 and 14 are High.
6.4 8
9.6 s
f
CSC
Any of pins 1, 4, 5, 6 or 14 is Low.
3.2 4
4.8 min.
Oscillator Frequency Fluctuation - 977P/977W T
A
=25C, V
CC
= 2.5 ~ 5V
15
k
H
z
f
max
-f
min
Parameters
Description
Test Condition Min. Type Max. Units
f
OSC
Oscillator Frequency *
t
FUN
Cycle Time of Function Code
t
STA
Cycle Time of Start Code
f
OSC
= 128 kHz
0.75 1 1.25
ms
f
OSC
= 128 kHz
1.5 2 2.5 ms
T
A
= 25C, R = 200 k
W 102 128 154
k
H
z
V
SI
SI Pin Receive Sensitivity (V
PP
)
Guaranteed Effective Decoding 300 mV
Oscillator Frequency Fluctuation - 978P
Oscillator Frequency Fluctuation - 978LW
T
A
=25C, V
CC
=2.5 ~ 5V
15
k
H
z
f
max
-f
min
T
A
=25C, V
CC
=2.0 ~ 5V
10
k
H
z
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
8
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Application Circuits
Typical Application of PT8A977P/977W For Transmit Circuit With 9V Battery
S1
S2
S3
S4
S6
R7
20
0K
R9
33
0
C1
2
.0
1
u
C1
1
4.
7u
C8
.0
2
u
R3
22
0K
L1
2.
2u
B1
9V
R4
6.
8K
R5
33
K
C9
68
C3
47
R1
10
0
C6
.0
2
u
L2
2.
2u
R2
4.
7K
C4
15
0
C2
15
0
C1
10
0
A1
ANT
E
NNA
CR1
27
.
1
45
R6
10
0
C7
68
L4
6.
8u
S5
V4
4.
7V
V7 41
48
V3
LED
R1
0
1K
R8
3.
9K
R1
2
1O
M
R1
1
10
M
L3
RIGHT
B
1
TES
TB
2
GND
3
BACK
4
FOR
5
TUR
BO
B
6
SC
7
SO
8
VDD
9
PC
10
OSC
O
11
OSC
I
12
OFF
13
LEFT
B
14
P
T
8A
9
77P
PO
W
E
R
OF
F
V1
90
14
V2
90
14
V5
85
50
V6
90
13
Left
SO
V
CC
PC
OSCO
OSCI
OFF
Right
SC
Turbo
Forward
Backward
GND
Test
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
9
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Typical Application of PT8A978P/978LW For Receive Circuit With Five Functions
V7
9013
V6
8050
V5
8550
V4
8550
V3
8050
V2
9013
VD
1
4.
2V
C1
4
.
01u
C1
3
4.
7u
C1
2
100u
C1
1
1000
C1
0
30
C6
18
C5
.
02u
C4
4.
7u
C3
3000
C2
47
V1
C
1815
C1
4
A1
C7
.1
u
C8
470
C9
.1
u
M1
M2
V1
1
9013
V1
2
8050
V1
3
8550
V1
4
8550
V1
5
8050
V1
0
9013
V8
9013
V9
8550
C1
6
.
02u
C1
7
.
02U
C1
5
.
01u
9V
12V
S1
L1
2.
2u
L2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P
T
8A
978
P
R1
1K
R2
180K
R3
2.
2K
R4
2.
2M
R5
2.
2K
R6
2.
2M
R7
2.
2K
R8
200K
R9
330
R1
0
4.
3K
R1
1
10
R1
2
510
R1
3
220
R1
4
220
R1
5
330
R1
6
100
R1
7
100
R1
8
330
R1
9
330
R2
0
100
R2
1
1K
R2
2
1K
R2
3
1K
R2
4
1K
R2
5
1K
C1
8
100u
C1
9
.1
u
LD RD
Backward Left
Forward Right
Turbo OSCO
V
CC
OSCI
VI1 SI
VO1 GND
VI2 VO2
9
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
10
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mechanical Diagram of 14-pin SOIC
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
11
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mechanical Diagram of 16-pin SOIC
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
12
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Notes
Pericom Technology Inc.
Email: support@pti.com.cn Web Site: www.pti.com.cn, www.pti-ic.com
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.
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