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Silan Semiconductors
INFRARED REMOTE CONTROL TRANSMITTER
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.
SC7461
FEATURES
* CMOS Technology * Low Power Consumption * 32+3 Function Keys * Least External Components * Wide range of operating voltage: VDD=1.8~5.5V * 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
APPLICATIONS
* TV and VCR * Audio Equipment * Audio Cassette Deck * Air Conditioner * Multi-Media DVD Player
ORDERING INFORMATION
Valid Part Number
SC7461-100 SC7461-101 SC7461-103 SC7461-104
Package
SOP-24 SOP-24 SOP-24 SOP-24
Custom Code in Mask ROM
C6~C12=1000000 C6~C12=0000000 C6~C12=0010000 C6~C12=1010000
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PIN CONFIGURATION
KI0 KI1 KI2 KI3 C4 C5 OUT VDD TEST OSCI
SC7461
1 2 3 4 5 6 7 8 9 10 24 23 22 21 20
C3 C2 C1 C0 KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7
SC7461
19 18 17 16 15 14 13
OSCO 11 Vss
12
BLOCK DIAGRAM
OSCI OSCO VDD VSS
10
KI0 KI1 KI2 KI3
11
8
Output Circuit
12 7 21
OUT C0 C1 C2 C3 C4 C5
1
OSC Circuit
2 3 4
Key Input Scan Circuit
Timing Generation &Control Circuit Custom Code Register
22 23 24 5
Code Generation Circuit
Key Output Timing Signal Generator
6 13
KO7
9
TEST
20
KO0
19
KO1
18
KO2
17
KO3
16
KO4
14
KO5
14
KO6
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ABSOLUTE MAXIMUM RATING (Tamb=25C,unless otherwise specified)
Characteristic
Maximum Supply Voltage Input Voltage Output Voltage Output Current Allowable Power Dissipation Storage Temperature Operating Temperature
SC7461
Description
VDD Each Input pin -OUT Ta<=85C ---
Symbol
VDD(max) VIN VOUT IOUT Pd(max) Tstg Topr
Value
Vss-0.3~10 Vss-0.3~VDD+0.3 Vss-0.3~VDD+0.3 -35 150 -50~+125 -40~+85
Unit
V V V mA mW C C
ELECTRICAL CHARACTERISTICS (Tamb=25C VDD=3.0V,unless otherwise specified)
Parameter
Operating Supply Current Quiescent Supply Current High Level Output Current High Level Output Voltage Low Level Output Voltage Output OFF-State Leakage Current Custom Code High Level Input Current Custom Code Low Level Input Current Input Floating Voltage Input Pull-Down Resistance
Symbol
IDD IDS IOH1 IOH2 VOH VOL IOFF IIH IIL VIF RIN
Test conditions
Key ON, Output: no load All keys OFF, OSC stops VDD=1.8V, VOH=1.0V VDD=3.0V, VOH=2.0V IOH=1mA IOL=1mA -VIN= VDD VIN= VSS ---
Min
Typ
Max
1 1
Unit
mA A mA mA V
-8 -25 2.4 0.2 1 1 -1 0.1VDD 75 100 125
V A A A V k
RECOMMENDED OPERATING CONDITIONS
(Tamb=25C, fosc=455kHz,unless otherwise specified) Characteristic
Supply Voltage High Level Input Voltage Low Level Input Voltage Oscillation Frequency
Symbol
VDD VIH VIL fosc
Min.
1.8 0.7VDD Vss 400
Typ.
3.0
Max.
5.5 VDD 0.3VDD
Unit
V V V KHz
455
500
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PIN DESCRIPTION
Pin No.
1~4 7 8 9 10 11 12 13~20 21~24 5,6
SC7461
I/O
I O -I I O -O I Key Input Pins Output Pins For Transit LED Drive Power Supply LSI Test Pin. This pin is normally set to High State or Floating. Oscillator Input Pin Oscillator Output Pin Power Supply Vss=GND Key Scan Timing Signal Output Pins Custom Code Input Pins. Capable of externally setting 6 out of 13 bits for custom coding.
Symbol
KI0~KI3 OUT VDD TEST OSCI OSCO VSS KO7~KO0 C0~C3 C4~C5
Description
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.
VDD 100pF 455KHz 100pF
SC7461
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
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SC7461
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 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
24 25 26 27
28 29 30 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
K20+K21 K20+K22 K20+K23
D0
1 0 1
D1
0 1 1
D2
1 1 1
D3
0 0 0
D4
1 1 1
D5
1 1 1
D6
0 0 0
D7
0 0 0
NOTE: Key Data--D6 and D7 may be preset to "0", "1" by mask option.
Key 20 (H=Key-ON)
Key 21
Key 22
Key 20 Key 20&21 Key 21 Key 22 Key 20&22 Transmission Transmission Transmission Transmission Transmission Transmission Stops Data Data Data Data Data
FIGURE 3. TRANSMISSION DATA DIAGRAM
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SC7461
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 C8 C9 C10 C11 C12 C0 C1 C2 C3 C4 C5 C6 C7 C8 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)
Key Data ( 8 bits)
FIGURE 4. SC7461 DATA FRAME
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 C8 C9 C10 C11 C12
Pin-Settable 6 Bits
Mask ROM 7 Bits
FIGURE 5. SC7461 CUSTOM CODE For example: Given the following setting,
VC5 C4
6 5 24 23 22 21
SC2461
C3 C2 C1 C0
FIGURE 6. EXAMPLE CUSTOM CODE SETTING then, the Custom Codes C0~C5 will have the following values:C0=0, C1=1, C2=1, C3=0, C4=0, C5=1.
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KEY DATA
SC7461
D2
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
The Key Data has 8 bits (D0~D7) and has the following Key Data Codes. D6 and D7 may be preset to "0", "1".
Key
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
D0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
D1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
D3
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
D4
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
D5
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D6
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D7
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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5.SC7461 TRANSMISSION CODE
SC7461
The SC7461 transmission code consists of a leader code, 13 bits custom code, and 8 bits key data codes. The inverse code of both the custom and key data codes are also sent simultaneously; thus, allowing an extremely low error rate in the system configuration. Please refer to the following diagram.
C0 C1 C2 C3 C4 C5 C6 C8 C9 C10 C11 C12 C0 C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
Leader Code
Custom Code (13 bits)
Custom Code (13 bits)
Key Data (8 bits)
Key Data ( 8 bits)
FIGURE 13. REM OUTPUT CODES The leader code consists of a 9ms carrier waveform followed by a 4.5ms OFF waveform. It is used as the leader for the following codes (Custom, Data and their respective inverse codes). Thus, when the reception is configured by a microcomputer, the time relationship between the reception detection and other processes can be managed efficiently. The code uses the PPM (Pulse Position Modulation) Method, with "1" and "0" differentiated by the time between pulses.
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6.SC7461 TRANSMISSION WAVEFORM
SC7461
The SC7461 Transmission Waveform illustrated below were derived from the time period for fosc=455KHz.
84.4ms 108ms 108ms Go To Second Transmission Go To Second Transmission and Onwards
9ms 4.5ms 13.5ms Leader Code 43.9ms 84.4ms 27ms Custom Code 13bits Custom Code 13 bits Key Data 8bits Key Data 8bits
First Transmission
0.56ms
9ms 13.5ms
4.5ms 0
1.125ms
1
2.25ms
0
1
0
1
1
Second Transmission Onwards (Transmission is available only when key input contimues)
9ms 13.5ms
4.5ms
0.56ms
Carrier Waveform
8.77s Carrier Frequency=1/12 fosc=38KHz 26.3s
FIGURE 8. SC7461 TRANSMISSION WAVEFORM
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TYPICAL APPLICATION CIRCUITS
VDD VDD VDD 100pF 455KHz VDD 100pF
SC7461
11
OSCO
10
OSCI
9
TEST
8
VDD
6
C5
5
C4
24
C3
23
C2
22
C1
21
C0 OUT
IR LED
4 3 2 1
KI3 KI2 KI1
7
1
SC7461
KO7 KO6 KO5 KO4 KO3 KO2 KO1
Vss KO0
12
KI0
13
14
15
16
17
18
19
20 C0=0 C1=1 C2=0 C3=1 C4=0 C5=1
FIGURE 9. SC7461 APPLICATION CIRCUIT DIAGRAM
PACKAGE OUTLINE
SOP-24-375-1.27
Unit: mm
10.45
7.70
1.27 15.74 15.34
0.41
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10
1.95
9.53

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