Data Sheet
PT8A990P/991P
9-Function Remote Controller
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Features
• The PT8A990P works as the encoder and the
PT8A991P works as the decoder
• Nine output pins, 5 for forward, backward, left,
right and turbo functions, and 4 functional keys
• Operation power supply: 3.0V to 5.5V
• Auto power-off if no key pressed within 2s
(PT8A990P)
• Auto shut-down if keep pressing a key for more
than 4 minutes (PT8A990P)
• Auto shut down if no signal input for more than 5
minutes (PT8A991P)
• Low operating current
• On-chip oscillator with an external resistor
• On-chip receiving amplifiers
• Few external components needed
General Description
The PT8A990P/991P is a pair of CMOS LSIs designed
for remote controlled toy car application. They have nine
control keys for controlling the corresponding motion (i.e.
forward, backward, left, right, turbo and 4 functional keys)
of the remote controlled car. They also have ‘Forward
(Backward)’ and ‘Turbo’ combination application.
Block Diagram
Figure 1. Block Diagram of PT8A990P
TDIS
OSCI
OSCO
f
0
f
0
/2
SC
Oscillator
Timing
Generator
MUX
SO
Forward
Backward
Left
Right
Turbo
F1
F2
F3
F4
Latch
Circuit
Logic
Control
PC
Counters
PT0053(15/03/01)
1
Ver:2
Data Sheet
PT8A990P/991P
9-Function Remote Controller
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Figure 2. Block Diagram of PT8A991P
ON/OFF
OSCI
OSCO
SI
VI1
VI2
VT1
VT2
LRTD
Oscillator
Timing
Generator
Decoding
Circuit
PC
Counter
Amp
PLA
Right
Left
Backward
Forward
Turbo
F1
F2
F3
F4
VO1
VO2
VT
Detector
Latch
Circuit
Package and Pin Assignment
PT8A990P
18-Pin PDIP
PT8A991P
22-Pin PDIP
Right
TDIS
GND
Backward
Forward
Turbo
SC
NC
F4
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
Left
F1
OSCI
OSCO
PC
V
CC
SO
F2
F3
VO2
GND
SI
OSCI
OSCO
F1
Right
F2
Left
PC
ON/OFF
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
VI2
VO1
VI1
V
CC
Turbo
Forward
Backward
VT2/LRTD
VT1
F4
F3
Top View
PT0053(15/03/01)
2
Ver:2
Data Sheet
PT8A990P/991P
9-Function Remote Controller
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Pin Description
Table 1. Pin Description of PT8A990P
P in
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Na me
Right
Typ e
I
Descr ip t ion
Rightward function selected if this pin connected to GND
For timer enable: opened or connected to V
CC
,
For timer disenable: connected to GND,
For test mode: connected to 1/2 V
CC
Ground
Backward function selected if this pin connected to GND
Forward function selected if this pin connected to GND
Turbo function selected if this pin connected to GND
Output pin of the encoding signal with carrier freqency
No Connection
TDIS
I
GND
Backward
Forward
Turbo
SC
NC
F4
F3
F2
SO
V
CC
PC
OSCO
OSCI
F1
Left
GND
I
I
I
O
I
I
I
O
P
O
O
I
I
I
Function 4 selected if connected to GND
Function 3 selected if connected to GND
Function 2 selected if connected to GND
Output pin of the encoding signal without carrier freqency
Power supply
Power control output pin
Oscillator output pin
Oscillator input pin
Function 1 selected if connected to GND
Leftward function selected if this pin connected to GND
PT0053(15/03/01)
3
Ver:2
Data Sheet
PT8A990P/991P
9-Function Remote Controller
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Table 2. Pin Description of PT8A991P
P in
1, 21
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20,22
Na me
VO2, VO1
GND
SI
OSCI
OSCO
F1
Right
F2
Left
PC
ON/OFF
F3
F4
VT1
LRTD/VT2
Backward
Forward
Turbo
V
CC
VI1,VI2
Typ e
O
GND
I
I
O
O
O
O
O
O
I
O
O
I
I
O
O
O
P
I
Descr ip t ion
Output pins of inverter 1 and 2 for Signal amplifier
Ground
Input pin for encoded signal
Oscillator input pin
Oscillator output pin
F1 function output pin
Rightward output pin
F2 function output pin
Leftward output pin
Power control pin
ON/OFF pin
F3 function output pin
F4 function output pin
Auto shut-off input pin: If voltage on VT1 pin is over 0.095V
CC
for 3 sec, all outputs
will be shut off automatically.
Left/Right turbo disable pin.
Optional for the 2nd Auto Shut-Off input pin.
Backward output pin
Forward output pin
Turbo output pin
Power supply
Input pins of invertor 1 and 2 for signal amplifier
PT0053(15/03/01)
4
Ver:2
Data Sheet
PT8A990P/991P
9-Function Remote Controller
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Functional Description
In normal operation without ‘Turbo’, forward (backward) out-
put pin of the decoder PT8A991P sends out a 60Hz signal. In
operation with ‘Forward (Backward)’ and ‘Turbo’ combined,
the output signal will be completely high. This function is de-
picted as follows.
Once a key is pressed, the PT8A990P is powered on, and the
PC output pin keeps on a high level. If no key pressed, The
PT8A990P will shut off automatically in 2s and nothing is
output on the PC pin. It can save battery power by shutting
down the device after pressing on any key for 4 minutes. The
PC pin is used to control on/off of the external power supply.
The PT8A991P has Auto Power Down feature when no signal
received within 5 minutes. The VT pins are used for Current
Limit Protection to meet HD271 Toys safety standard. There
are two over- current-protection pins in PT8A991P. If the in-
put voltage is over 0.095V
CC
for 3 seconds, the output level
will be off. The LRTD/VT2 is optional.
Data Format
See Figure 4.
Coding Method
Each trigger pin is triggered by corresponding bit of data in
format of “1”. The data string is 18-bit and divided to four
segments, i.e., Start Code, Data Code, Parity Code and End
code, where
Start Code = 11110.
Data Code = F3 F4 F B T R L F1 N1 N2 F2
F = Forward
R = Right
F2 = Function 2
B = Backward
L = Left
F3 = Function 3
N1, N2 = Reserved
T = Turbo
F1= Function 1
F4 = Function 4
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, R&L, N1 and N2.
Figure 4. Data Format
"1"
Frequency: 500Hz, Duty Cycle: 3/4
"0"
Frequency: 500Hz, Duty Cycle: 1/4
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested)
Note:
Storage Temperature ........................................................ -25
o
C to +85
o
C Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied ......................... 0
o
C to +70
o
C RATINGS may cause permanent damage to the
Supply Voltage to Ground Potential (Inputs & V
CC
Only) .... -0.5 to +5.5V device. This is a stress rating only and functional
Supply Voltage to Ground Potential (Outputs & D/O Only) -0.5 to +5.5V operation of the device at these or any other condi-
DC Input Voltage ................................................................ -0.5 to +5.5V tions above those indicated in the operational sec-
DC 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.
PT0053(15/03/01)
5
Ver:2
电机控制
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