UTC RCT02 CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R502-002,C
Encoder For Remote Controller
With Five Functions
DESCRIPTION
The chip can be used with the decoder RCR02 to provide a
complete control functions to the remote-controlled toy. The
RCT02 has five input pins corresponding with the five
function buttons i.e, forward, backward, rightward, leftward
and turbo. The encoding circuit in the RCT02 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.
There is an internal oscillator in the RCT02. 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 RCT02 and RCR02 must
be less than 25%.
The auto-power-off function is achieved by an internal
counter. When the RCT02 is powered on, the counter is reset
and begin to count. Any action of push down or release the
function button also reset the counter. The PC pin will keep
on a high level until the counter counts up to about 4 minutes.
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.
FEATURES
*Five input pins used for five control buttons
*Operating power-supply voltage range: 2.5 to 5.0V
*Auto-power-off if no press on any button in 4 minutes or
continuously press on any button over 4 minues
*Manual-power-on/off with ON/OFF button
*One output pin used for external power control
*Press on any button as wake up
*On-chip oscillator with an external resistor
*Low operating current
*Few external components needed
DIP-14
SOP-14
UTC RCT02 CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R502-002,C
Logic Block Diagram
OFF
OSCI
Oscillator
Timing
Generator
4 Minutes
Counter
Output
Circuit
OSCO
SO
RIGHTB
TURBOB
PC
FORWARDB
BACKWARDB
LEFTB
SC
Encoding
Circuit
Input
Circuit
Product Pin Configuration and Pin Description
PC
OSCI
OSCO
TURBOB
OFF
SO
RIGHTB
TESTB
FORWARDB
BACKWARDB
LEFTB
1
2
3
4
5
6
7
14
13
12
11
10
9
SC
GND
VDD
8
Pin No.
Pin Name
Description
1
RIGHTB
The rightward function will be selected, if this pin is connected to GND
2
TESTB
This pin is used for testing mode
3
GND
Negative power supply
4
BACKWARDB The backward function will be selected, if this pin is connected to GND
5
FORWARDB
The forward function will be selected, if this pin is connected to GND
6
TURBOB
The turbo function will be selected, if this pin is connected to GND
7
SC
Output pin of the encoding signal with carrier frequency
8
SO
Output pin of the encoding signal without carrier frequency
9
VDD
Positive power supply
10
PC
Power control output pin
11
OSCO
Oscillator output pin
12
OSCI
Oscillator input pin
13
OFF
This pin is used to shut down the external power supply
14
LEFTB
The leftward function will be selected, if this pin is connected to GND
UTC RCT02 CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R502-002,C
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL
VALUE
UNIT
DC Input Voltage
V
IN
-0.5 ~ +5.5
V
Supply Voltage to Ground Potential(Inputs &V
DD
Only)
-0.5 ~ +5.5
V
Supply Voltage to Ground Potential(Outputs &D/O
Only)
-0.5 ~ +5.5
V
DC Output Current
Io
20
mA
Power Dissipation
P
D
500
mW
Ambient Temperature With Power Applied
T
A
-10 to +40
C
Storage Temperature
T
STG
-25 to +85
C
DC ELECTRICAL CHARACTERISTICS
(Over the operating rating, T
A
= -10
C~ +40C,V
DD
=4.0V10%)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
Operating Voltage
V
DD
2.5 4.0 5.0 V
Supply Current
I
DD
Output
unloaded
300
A
Standby Current
I
STB
OFF
state
10
A
Input Current
I
IN
Pin
1,4,5,6,14
60
A
Input Low Voltage
V
IL
Guaranteed Logic Low Level
0.5
V
Output High Voltage
V
OH
I
OUT
=1.0mA 3.5
V
Output High Current
I
OH
V
OUT=
1.4V -4.0
mA
Output Low Voltage
V
OL
I
OUT
=150
A
0.5
V
Output Low Current
I
OL
V
OUT=
0.5V 150
A
AC ELECTRICAL CHARACTERISTICS
(Over the operating rating, T
A
= -10
C to +40C,V
DD
=4.0V10%)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
Oscillator Frequency
(Note 1)
Fosc
T
A
=25
C,R=200K 102
128
154
KHz
Cycle Time of Function Code
T
FUN
F
OSC
=102~ 154KHz
0.8
1
1.2
ms
Cycle Time of Start Code
T
STA
F
OSC
=102~ 154KHz
1.6
21
2.4
ms
Carrier Frequency of SC Pin
F
CSC
F
OSC
=102~ 154KHz
51
64
77
KHz
Time of Auto-Power-Off
(Note 2)
T
OFF*
F
OSC
=102~ 154KHz
3.2
4
4.8
min.
Note 1: The relative error between the frequencies of the two on-chip oscillators in the RCT02 and RCR02 must be
less than25%.
Note 2: When adjust the external oscillator resistor, the auto-power-off time will vary relevantly.
UTC RCT02 CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R502-002,C
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
Function Code: n' W1
1 Word
ENCODING TIMING
W2 W2 W2 W2 (n)' W1 W2 W2 W2 W2 (n)' W1 W2 W2 W2 W2 (n)' W1 W2 W2 W2 W2 (n)'W1- - - - - - - -
Press any buttons
Encoding output
1st word 2nd word
Function Codes
End Codes
last word
1
2
3
14
15
UTC RCT02 CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R502-002,C
Number of Function Codes (n) W1
Function Buttons
4 (End
Code)
10 Forward
16
Forward & Turbo
22 Turbo
28
(Turbo/Forward) & Left
34
(Turbo/Forward) & Right
40 Backward
46
Backward & Right
52
Backward & Left
58 Left
64 Right
PC Output Timing
V
DD
OFF
4 Minutes
PC
V
DD
PC
OFF
4 Minutes
Note: There is no press on any function button.
V
DD
Press Function
buttons
PC
4 Minutes
4 Minutes
4 Minutes
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