Data Sheet
PT8A9791/PT8A9792 Remote Controller
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Features
• The PT8A9791 works as the encoder and the
PT8A9792 works as the decoder
• Full functions of Forward, Backward, Left, Right,
and OP1 and OP2
• 100% and 60% duty cycle pulse output control
for Forward/Backward and Left/Right
• 50% duty cycle pulse output control for OP1, OP2
• Wide operation power supply: 3V - 12V
• SO (Serial Output) pin for external RF transmitter
(PT8A9791)
• On-chip oscillator with an external resistor
• Few external components needed
General Description
The PT8A9791 and PT8A9792 is a pair of CMOS
ICs designed for remote control toy car application.
They have full functional keys for motion control of
a remote control car, including forward, backward,
left, right and 2 additional keys OP1 and OP2. Low
Voltage CMOS technology is employed for the
PT8A9791 and PT8A9792.
The function of OP1,OP2 is depicted in Table 3. Two
additional control pins FBP and LRP of PT8A9791
for pulse effect control are described in Tables 4 and
5.
Ordering Information
O r d er in g Nu m b er
PT8A9791P
PT8A9791W
PT8A9792P
PT8A9792W
Pa ck a ge
14-Pin PDIP
14-Pin SOP
16-Pin PDIP
16-Pin SOP
PT0117(10/02)
1
Ver:0
Data Sheet
PT8A9791/PT8A9792 Remote Controller
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Block Diagram
Figure 1. Block Diagram of PT8A9791
OSCI
OSCO
Forward
Backward
Left
Right
OP1
OP2
FBP
LRP
Oscillator
Timing
Generator
Encoder
SO
Latch
Circuit
Logic
Control
PC
V
CC
Figure 2. Block Diagram of PT8A9792
OSCI
OSCO
SI
VI1
VI2
V
CC
CON
Oscillator
Timing
Generator
Counter
Counter
Amp
PLA
VO1
VO2
Right
Left
Backward
Forward
OP1
OP2
Control
Logic
Latch
Circuit
Package and Pin Assignment
PT8A9791
14-Pin PDIP
14-Pin SOP
Forward
Backward
FBP
LRP
GND
OSCI
OSCO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Left
V
CC
Right
OP1
OP2
PC
SO
Forward
OP1
OP2
OSCO
OSCI
SI
GND
VO2
PT8A9792
16-Pin PDIP
16-Pin SOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Backward
Right
Left
CON
V
CC
VI1
VO1
VI2
Top View
PT0117(10/02)
2
Ver:0
Data Sheet
PT8A9791/PT8A9792 Remote Controller
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Pin Description
Table 1. Pin Description of PT8A9791
P in No
1
P in Na me
Forward
Backward
Typ e
I
I
Descr ip t ion
Forward function input, active high, built-in pull-down resistor
Backward function input, active high, built-in pull-down resistor
Pulse Mode Control input for PT8A9792’s Forward and Backward, active high, built-in
pull-down resistor (Details see Table 4)
Pulse Mode Control input for PT8A9792’s Left and Right, active high, built-in pull-
down resistor (Details see Table 5)
Ground
Oscillator input pin
Oscillator output pin
Serial Data Output
Power control output pin, active high
Option 2 Function input, active high, built-in pull-down resistor (See Table 3)
Option 1 Function input, active high, built-in pull-down resistor (See Table 3)
Right function input, active high, built-in pull-down resistor
Power supply
Left function input, active high, built-in pull-down resistor
2
3
4
5
6
7
8
9
10
11
12
13
14
FBP
LRP
GND
OSCI
OSCO
SO
PC
OP2
OP1
Right
V
CC
Left
I
I
GND
I
O
O
O
I
I
I
Power
I
PT0117(10/02)
3
Ver:0
Data Sheet
PT8A9791/PT8A9792 Remote Controller
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Table 2. Pin Description of PT8A9792
P in No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P in Na me
Forward
OP1
OP2
OSCO
OSCI
SI
GND
VO2
VI2
VO1
VI1
V
CC
CON
Left
Right
Backward
Typ e
O
O
O
O
I
I
GND
O
I
O
I
Power
I
O
O
O
Descr ip t ion
Forward output, active high or pulse output (Details see Table 4)
Option 1 Open Drain output, pulse output (Details see Table 3)
Option 2 Open Drain output, pulse output (Details see Table 3)
Oscillator output
Oscillator input
Serial Data Input
Ground
Inverse Amplifier 2 output
Inverse Amplifier 2 input
Inverse Amplifier 1 output
Inverse Amplifier 1 input
Power Supply
Shunt Regulator Control, enabled when high voltage, disabled when low voltage
Turn Left output, active high or pulse output (Details see Table 5)
Turn Right output, active high or pulse output (Details see Table 5)
Backward Output, active high or pulse output (Details see Table 4)
Table 3. OP1 and OP2 Functions
I n p u t t o P T 8A9791
OP1
High
Open
High
Open
OP2
Open
High
High
Open
OP1
Pulse
Open
Pulse
Open
O u t p u t fr om P T 8A9792
OP2
Open
Pulse
Pulse
Open
Notes:
1. OP1 and OP2 are open drain.
2. Pulse = 125Hz (f
OSC
/ 1024) in 50% duty cycle
3. When OP1 and OP2 are both active, the output pulse is opposite phase.
PT0117(10/02)
4
Ver:0
Data Sheet
PT8A9791/PT8A9792 Remote Controller
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Table 4. FBP Functions
I n p u t t o P T 8A9791
F BP
Open
Open
Open
High
High
High
For wa r d
Open
High
Open
Open
High
Open
Ba ck wa r d
Open
Open
High
Open
Open
High
O u t p u t fr om
P T 8A9792
For wa r d
Low
High
Low
Low
Pulse
Low
Ba ck wa r d
Low
Low
High
Low
Low
Pulse
Table 5. LRP Functions
I n p u t t o P T 8A9791
LRP
Open
Open
Open
High
High
High
R igh t
Open
High
Open
Open
High
Open
L eft
Open
Open
High
Open
Open
High
O u t p u t fr om
P T 8A9792
R igh t
Low
High
Low
Low
Pulse
Low
L eft
Low
Low
High
Low
Low
Pulse
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested)
Note:
Storage Temperature ........................................................ -20
o
C to +85
o
C Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied ...................... -10
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 +12V device. This is a stress rating only and functional
Supply Voltage to Ground Potential (Outputs & D/O Only) . -0.5 to +12V operation of the device at these or any other condi-
DC Input Voltage ................................................................. -0.5 to +12V 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.
Recommended Operation Conditions
Table 6. Recommended Operation Conditions
Sym
V
BAT
I
VR
V
IH
V
IL
f
OSC
T
A
Descr ip t ion
Battery Pack Voltage
Shunt Regulator Operating Current
Input HIGH Voltage
Input LOW Voltage
Oscillator Frequency
Operation Temperature
Min
2.0
0.5
0.7V
CC
0
-
-10
Typ
-
-
-
-
128
-
Ma x
9.6
20
V
CC
0.3V
CC
-
55
Un it s
V
mA
V
V
kHz
O
C
PT0117(10/02)
5
Ver:0
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