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SC7461
INFRARED REMOTE CONTROL TRANSMITTER OF 7461 CODE FORMAT
DESCRIPTION
The SC7461 is a remote control transmitter utilizing CMOS
Technology specially designed for infrared applications. It is capable
of controlling 32 function keys and 3 double keys. SC7461 is housed
in 24 pins, SO Package and provides 13 bits Custom Code.
FEATURES
* CMOS Technology
* Low Power Consumption
* 32+3 Function Keys
* Least External Components
* Wide range of operating voltage: VDD=2.0~5.5V
* Double key operation(No order of priority given)
* On-Chip Oscillator can be constructed using an externally
connected ceramic resonator
* Up to 64 Custom Codes may be selected externally for SC7461
SOP-24-375-1.27
APPLICATIONS
* TV and VCR
* Audio Equipment
* Audio Cassette Deck
* Air Conditioner
* Multi-Media DVD Player
ORDERING INFORMATION
Part Number
SC7461-100
SC7461-101
SC7461-103
SC7461-104
Package
SOP-24-375-1.27
SOP-24-375-1.27
SOP-24-375-1.27
SOP-24-375-1.27
Custom Code in Mask ROM
C6~C12=1000000
C6~C12=0000000
C6~C12=0010000
C6~C12=1010000
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:3.0 2007.07.02
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SC7461
ABSOLUTE MAXIMUM RATING (Tamb=25°C, unless otherwise specified)
Characteristics
Maximum Supply Voltage
Input Voltage
Output Voltage
Output Current
Allowable Power Dissipation
Storage Temperature
Operating Temperature
Symbol
VDD(max)
VIN
VOUT
IOUT
Pd(max)
Tstg
Topr
Description
VDD
Each Input pin
--
OUT
Ta<=85°C
--
--
Value
Vss-0.3~10
Vss-0.3~VDD+0.3
Vss-0.3~VDD+0.3
-35
150
-40~+125
-10~+70
Unit
V
V
V
mA
mW
°C
°C
ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=3.0V,unless otherwise specified)
Characteristics
Symbol
Test conditions
Operating Supply Current
IDD Key ON, Output: no load
Quiescent Supply Current
IDS All keys OFF, OSC stops
High Level Output Current
IOH1
IOH2
VDD=1.8V, VOH=1.0V
VDD=3.0V, VOH=2.0V
High Level Output Voltage
VOH
IOH=1mA
Low Level Output Voltage
VOL IOL=1mA
Output OFF-State Leakage Current
IOFF
--
Custom Code High Level Input Current IIH
VIN= VDD
Custom Code Low Level Input Current
IIL
VIN= VSS
Input Floating Voltage
VIF --
Input Pull-Down Resistance RIN --
Min.
2.4
-1
75
Typ.
-8
-25
Max.
1
1
0.2
1
1
0.1VDD
100 125
Unit
mA
µA
mA
mA
V
V
µA
µA
µA
V
k
RECOMMENDED OPERATING CONDITIONS
(Tamb=25°C, fosc=455kHz,unless otherwise specified)
Characteristics
Symbol
Supply Voltage
VDD
High Level Input Voltage
VIH
Low Level Input Voltage
VIL
Oscillation Frequency
fosc
Min.
2.0
0.7VDD
Vss
400
Typ.
3.0
455
Max.
3.3
VDD
0.3VDD
500
Unit
V
V
V
KHz
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:3.0 2007.07.02
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PIN CONFIGURATION
P12i131n5111~789~~,N0126422o04. KSKOCCOTOyIOVV7040ESmS~UD~~S~SCCKCCbDSKTTOOoII353l0OOPLPOKKCfoSooeeussurwIwyystcccpTiituISeellouneaasrrcmtpstttaSSPoooutnuumCrritPnppPIOToinsnppciidupnm.ollFyyetusTpdoiVtnhiuIrnnPsgitTsgpsiPnrS.u=paiintiGgnnPsnNiiaistnDlLsnOE.ouCDrmtpaDaupDlrtaieyvPbessilnecesrtoiptfoteiHoxtniegrhnaSltayteseotrinFgloa6tionugt.of13bits
*Widerangeofoperatingvoltage:VDD=2.0~5.5V
KI0 1
KI1 2
KI2 3
KI3 4
C4 5
C5 6
OUT 7
VDD 8
TEST 9
OSCI 10
OSCO 11
Vss 12
24 C3
23 C2
22 C1
21 C0
20 KO0
19 KO1
18 KO2
17 KO3
16 KO4
15 KO5
14 KO6
13 KO7
SC7461
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SC7461
FUNCTIONAL DESCRIPTION
1. OSCILLATION CIRCUIT
A self-biased type amplifier is housed by a CMOS Inverter Method. Thus, an oscillation circuit can be
constructed by connecting a ceramic resonator. Please refer to Figure 4 for the oscillation circuit diagram.
FIGURE 1. OSCILLATION CIRCUIT DIAGRAM
Unless the keys are being operated, the oscillation is normally stopped. Thus, power consumption is
considerably reduced.
2. KEY INPUT
A total of 32 keys can be connected by Key Inputs--KI0~KI3 and Timing Signals--KO0~KO7. Double Key
Operation is possible for only Key No.20 in combination with the other keys connected to the KO5 line, namely:
Key No.21, 22 or 23. Thus, only the following key combinations may be used for the double key operation:
1).Key Nos.20 and 21
2).Key Nos.20 and 22
3).Key Nos.20 and 23
There is no order of priority given in key input. This means that keys designated for the double keying
operation may be pressed in any sequence. When two keys (designated for the double key operation) are pressed
simultaneously, a series of pulse is outputted according to each key input. Pressing other keys that are NOT
intended for the double key operation do NOT generate any output.
The Key Matrix is given in the following diagram.
KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7
0 4 8 12 16 20 24 28
1 5 9 13 17 21 25 29
2 6 10 14 18 22 26 30
3 7 11 15 19 23 27 31
KI0
KI1
KI2
KI3
FIGURE 2. KEY MATRIX
3. DOUBLE KEY OPERATION
Double Key Operation is useful for tape deck recording operation. The following table shows the Key Data
corresponding to the double keys pressed. Also refer to the Key Input Section.
Key D0 D1 D2 D3 D4 D5 D6 D7
K20+K21
1
0
1
0
1
1
0
0
K20+K22
0
1
1
0
1
1
0
0
K20+K23
1
1
1
0
1
1
0
0
NOTE: Key Data--D6 and D7 may be preset to "0", "1" by mask option.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:3.0 2007.07.02
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SC7461
Key 20
Key 21
(H=Key-ON)
Key 22
TraKnDsemyati2as0sionTKraenyDs2ma0tia&ss2i1onTraKnDsemyat2ias1sionTranSstmopisssionTraKnDsemyati2as2sion
Key 20&22
Transmission
Data
FIGURE 3. TRANSMISSION DATA DIAGRAM
When any of the double key combinations (Key No.20&21, Key No.20&22 and Key No.20&23) are pressed:
1).D5 is set to "1"
2).No Key Input Sequence is needed to perform the Double Key Operation
4. SC7461 DATA FRAME
A SC7461 Data Frame consists of 42 bits, namely: 13 bits Custom Code (C0~C12), 8 bits Key Data (D0~D7),
and their respective Inverse Codes. Please refer to the figure below.
C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
Custom Code (13 bits)
Custom Code (13 bits)
Key Data (8 bits)
FIGURE 4. SC7461 DATA FRAME
Key Data ( 8 bits)
CUSTOM CODE
The Custom Code consists of 13 bits, namely: C0~C12. 7 bits--C6~C12-- are fixed by the on-chip ROM while
6 bits--C0~C5--are pin-settable. SC7461 provides up to 64 custom codes that may be selected externally without
any diode requirement. Please refer to the illustration below.
C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12
Pin-Settable
6 Bits
Mask ROM
7 Bits
FIGURE 5. SC7461 CUSTOM CODE
For example: Given the following setting,
C5 6
V-
C4 5
C3 24
C2 23
C1 22
C0 21
FIGURE 6. EXAMPLE CUSTOM CODE SETTING
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:3.0 2007.07.02
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