SC3010
INFRARED REMOTE CONTROL TRANSMITTER OF RC5 CODE FORMAT
DESCRIPTION
SC3010
is
a
remote
control
transmitter
utilizing
CMOS
SOP-28
Technology specially designed for use on general purpose (RC-5)
infrared applications with low voltage supply and large debounce
time. SC3010 supports 32 systems. Each system has a maximum of
64 commands; thus, SC3010 can provide up to a total of 2,048
commands.
FEATURES
* CMOS Technology
* Low Voltage Supply
* Supports up to 32 systems
* Single Pin Oscillator
* Bi-phase Transmission Technique
* Provides 2,048 Commands
Device
SC3010
SC3010S
DIP-28
ORDERING INFORMATION
package
DIP-28-600-2.54
SOP-28-375-1.27
APPLICATIONS
* Television
* VCR
* Audio Equipment
* Multi-Media System
* Personal Computer
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
Page 1 of 15
SC3010
ABSOLUTE MAXIMUM RATING
(T
amb
=25°C, unless otherwise specified)
Characteristics
Supply Voltage*
Input Voltage*
Output Voltage*
Operating Temperature
NOTE: * = with reference to Vss.
Symbol
V
DD
V
IN
V
OUT
T
OPR
V
DD
=3 V
V
DD
=3 V
V
DD
=3 V
Test conditions
Value
V
SS
-0.3 ~ 5.5
-0.5 ~ V
DD
+0.5
-0.5 ~ V
DD
+0.5
-20~85
Unit
V
V
V
°C
ELECTRICAL CHARACTERISTICS
(T
amb
=25°C, unless otherwise specified)
Characteristics
Supply Voltage
Stand-By Current
Input Current(KI0~KI7,C0~C3)
High Level Input Voltage
(KI0~KI7,C0~C3,SMS,T1,T2)
Low Level Input Voltage
(KI0~KI7,C0~C3,SMS,T1,T2)
Input Current Leakage
(KI0~KI7,C0~C3)
Symbol
V
DD
I
DD
I
IN
V
IH
V
IL
Test conditions
Freq=455KHz
V
DD
=3V (Output no load)
VI=0V T1=0 T2=0 SMS=0
V
DD
=3V, (KI0~KI7 And
C0~C3 Connected To V
DD
)
V
DD
=3V ,( T1,T2,OSC,SMS
Connected To V
SS
)
V
I
=3V V
DD
=3V
I
LEAK1
T1=T2=High
V
I
=0V V
DD
=3V
T1=T2=High
I
LEAK2
Input Current Leakage (OSC)
I
LEAK3
Input Leakage Current
(SMS,T1,T2)
High Level Output Voltage
(Dout, MDOUT)
Low Level Output Voltage
(Dout, MDOUT)
Output Current Leakage
(Dout, MDOUT)
Low Level Output Voltage
(KO0~KO7)
Output Current Leakage
(KO0~KO7)
Drive Current (Dout, MDout)
Operational Frequency
Free-Running Frequency
I
LEAK4
V
I
=0V V
DD
=3V
T1=T2=High
V
I
=3V V
DD
=3V
T1=T2=High
V
I
=3V V
DD
=3V T=25°C
V
I
=0V V
DD
=3V T=25°C
V
DD
=3V I
OH
=0.4mA
V
DD
=3V I
OH
=0.6mA
V
o
=3V V
DD
=3V T=25°C
V
o
=0V V
DD
=3V T=25°C
V
DD
=3V I
OL
=0.3mA
V
o
=3V V
DD
=3V T=25°C
I
LEAK6
V
o
=3V V
DD
=3V T=-
25~85°C
I
D
F
osc1
F
osc2
V
DD
=3V Vo=1.5V
V
DD
=3V
V
DD
=3V
1.5
400
50
0
3
V
DD
- 0.3
V
V
OL
I
LEAK5
0.35
10
1
0.8
1
10
2
600
100
µA
mA
KHz
KHz
µA
V
4.5
0
0
0
15
0
0
0.7V
DD
0.3V
DD
1.0
µA
1.0
1.0
µA
30
1.0
1.0
µA
Min
2.0
Typ
3.0
0
15
Max
5.5
10
600
Unit
V
µA
µA
V
V
V
OH
V
OL
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
Page 2 of 15
SC3010
PIN CONFIGURATIONS
PIN DESCRIPTION
Pin No.
1
2
3~6
7
8
9~13
14
15~17
18
19
20
21~27
28
Symbol
KI7
SMS
C0~C3
MDOUT
DOUT
KO7~KO3
V
SS
KO2~KO0
OSC
T2
T1
KI0~KI6
V
DD
Key Sense Input Pin
System Mode Selection Input Pin
Key Sense Input Pins
Generated Output Data Pin modulated with 1/12 oscillator frequency at a 25%
duty factor
Generated Output Data Pin
Scan Driver Pins
Negative Power Supply
Scan Driver Pins
Oscillator Input Pin
Test Pin 2
Test Pin 1
Key Sense Input Pins
Positive Power Supply
Description
FUNCTIONAL DESCRIPTION
1. KEY INPUT OPERATION
A Key Input Operation may be considered legal or illegal depending on the keys pressed. For key
interconnection refer to the application circuit diagram in APPLICATION CIRCUIT SECTION. The maximum
value of the switched key contact series resistance is 7kΩ.
a). Legal Key Input
A legal key input operation enables the device to activate the corresponding codes. A key input operation is
considered as legal if it is 1). a connection of one K-Input (KI0~KI7) to one K-Output (KO0~KO7), or 2).a
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:2.2
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SC3010
connection of one C-Input(C0~C3) to one K-Output (KO0~KO7) when the System Mode Selection (SMS) Pin is in
a LOW state. If the SMS is in a HIGH state, then a wired connection must be made between a C-Input to a K-
Output in order to generate the system number. For connections consisting of one K-Input or C-Input to more
than one K-Output Pins, the last scan signal is recognized as LEGAL.
b). Illegal Key Input
An illegal key input operation does not produce any activity. No activity will be generated if 1) two or more K-
Input/C-Input Pins or 2) C-Input and K-Input Pins are activated simultaneously. The oscillator will not start. Thus,
this operation is considered as ILLEGAL.
2. INPUTS: KI0~KI7 & C0~C3
In the quiescent state, the command inputs KI0~KI7 are pulled HIGH by an internal pull-up transistor. Also if
the system is quiescent and the System Mode Selection Input (SMS) is in High state so that current flow may be
prevented. A wired connection in the C-KO Matrix provides 32 systems.
3. DATA OUTPUT
One Code
MSB
LSB MSB
LSB
Debounce Time Scan Start Bit
(16-Bit Time) Time
Control
(2-Bit Time)
Bit
System Bits
Command Bits
First Code
Repetition Time
Second Code
Where: debounce time+ scan time=18 bit-times, Repetition time=4x16 bit-times
Figure 1: Data Output Format
The generated information is transmitted through the output signal DOUT. The Data Output Code consists of
1.5 Start Bits (2xLogic 1), 1 Control Bit, 5 System Bits, and 6 Command Bits. Please refer to the diagram above
for the data output format. (See also Command and System Matrixes).
After a legal key operation is performed, the KO outputs are switched off and a 16-bit debounce time period is
experienced followed by a 2-bit scan cycle time. During the scanning cycle the outputs are switched to the
conductive state one at a time.
Code is transmitted using a biphase technique. Please refer to the diagram below. The MDOUT Output Signal
transmits the generated data modulated by 1/12 of the oscillator frequency with a 25% duty factor.
Logic 1
Logic 0
where: 1 bit-time=3x2
8
xTosc=1.688ms (typ. Tosc=1/455KHz)
Figure 2: Biphase Code Transmission Technique
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:2.2
2005.12.15
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SC3010
Both the DOUT and the MDOUT are non-conducting (3-state outputs) when in the quiescent state. The Scan
Driver Outputs (KO0~KO7) are open drain n-channel and conduct when the circuit is in the quiescent state.
4. SYSTEM MODES
a). Combined System Mode (SMS=Low)
The KI and the C Sense Inputs have p-channel pull-up transistors (meaning they are normally in HIGH state).
They are pulled to LOW state when an output is connected, to them as a result of a legal key operation. A legal
key operation in the KI-KO or C-KO Matrix will initiate a debounce cycle. Once key contact has been established
for 18-bit time without any interruption, the Oscillator Enable Signal is latched and the key may be released. The
device is reset when there is an interruption during the 18-bit time period. At the end of the debounce cycle, KO
Outputs are switched off and two scan cycles begins.
When KI or C Input senses a low level output, a Latch-Enable Signal is fed to the System (C-Input) or
Command (KI-Input) Latches. After latching a system number, the device will generate the last command (i.e. all
command bits logic 1) in the selected system for as long as the key is pressed. Latching of a command number
causes the chip to generate this command together with the system number stored in the system latch. By
releasing the key, the device will be reset if no data is to be transmitted at the time. The complete code frame is
transmitted even if the key is released during code transmission.
b). Single System Mode (SMS=High)
In the Single System Mode, the KI-Sense Inputs are also pulled High by the p-channel pull-up transistors, as in
the Combined System Mode. The C-Sense Inputs, however, are disabled by switching off their pull-high
transistors. A system code is provided by a wired connection between the C-KO Matrix. The debounce cycle can
ONLY be started by any legal key operation in the KI-KO Matrix. Once the key contact has been established for
18-bit time without any interruption, the Oscillator-Enable Signal is latched and the key may be released. Any
interruption during the 18-bit time period resets the internal action.
At the end of the debounce cycle, the pull-up transistors in the KI-Lines are then switched off and the pull-up
transistors in the C-lines are turned ON for the first scan cycle. The wired connection in the C-matrix matrix is
then translated into a system number and stored in the system latch. At the end of the first scan cycle, 1) the C-
Input pull-up transistors are switched off and the inputs are again disabled, 2) KI-Sense Input pull-up transistors
are turned on. The command number is generated by the second scan cycle. This command number is then
latched and transmitted together with the system number.
5. KEY RELEASE DETECTION
An additional control bit is complemented after key release. This additional control bit tells the decoder that the
next code is a new command. This feature is important in cases where more digits are needed to be inputted (i.e.
Teletext channel numbers or Viewdata pages). The extra control bit will only be complemented after the
completion of at least one code transmission. The scan cycles are repeated before every code transmission; thus,
even with the Take Over of key operation during the code transmission, the correct system and command
numbers are generated.
6. RESETTING THE DEVICE
The device will immediately reset under the following conditions:
1). A key is released during the debounce time
2). A key is released between two codes
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
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