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Small 7-key User-definable
Remote Control
User’s Guide
© 2004-2009 Sure Electronics Inc. RMB-CM11111_Ver1.0
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SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Table of Contents
Chapter 1. Overview ..........................................................................................................1
1.1 Overview..............................................................................................................1
1.2 Features...............................................................................................................1
1.3 Applications......................................................................................................... 1
Chapter 2. Key Description...............................................................................................2
2.1 NEC Protocol....................................................................................................... 2
2.1.1 Features.........................................................................................................................2
2.1.2 Modulation.................................................................................................................... 2
2.2 Key Description...................................................................................................2
2.3 Example ............................................................................................................... 3
Chapter 3. Specifications.................................................................................................. 4
Chapter 4. Appendix..........................................................................................................5
Chapter 5. Contact Us .......................................................................................................6
© 2004-2009 Sure Electronics Inc.
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Small 7-key User-definable Remote Control
NOTES:
Product Version ： Ver 1.0
Document Version ： Ver 1.0
RMB-CM11111_Ver1.0_Page ii
© 2004-2009 Sure Electronics Inc
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1.1 Overview
Thanks for using this 7-key user-definable infrared remote control which is designed
especially for DIY enthusiasts. This remote control utilizes NEC IR encoding mode and
integrates SC6122 IC as the remote control transmitter which utilize s CMOS Technology
specially designed for use on infrared remote control applications. Seven sensitive and
durable dome keys are integrated.
Use an infrared decoder or a decoder along with an external infrared receiver to receive
and transmit the data of the keys to a processor (like PC, MCU) on which you can write
new programs to redefine the keys’ functions for use in various remote control
applications. The corresponding hexadecimal of each key is supplied in this manual,
making the process easier.
1.2 Features
y Compact and durable
y Black, ABS packaging
y Smooth rounded shape
y Integrated with seven dome keys
y Powered by two 1.5V AA batteries
y Long service time: 3 years
y Available to use keys 100,000 times
y Low power consumption
1.3 Applications
y Volume control in amplifier application
y Smart Home like color, brightness and power control of lights, movement control of
y Other remote control applications
SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Chapter 1. Overview
Note: If you buy the combination of the remote control and an infrared decoder
module from Sure Electronics, please make sure the processor you use supports SPI or
UART communication since this infrared decoder module supports SPI/UART output.
curtains
© 2004-2009 Sure Electronics Inc.
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2.1 NEC Protocol
This remote control utilizes NEC IR protocol for encoding.
2.1.1 Features
y 8 bit address and 8 bit command length
y Address and command are transmitted twice for reli ability
y Pulse distance modulation
y Carrier frequency of 38kHz
y Bit time of 1.125ms or 2.25ms
2.1.2 Modulation
The NEC protocol uses pulse distance encoding of the bits. Each p ulse is a 560µs long
38kHz carrier burst (about 21 cycles). A logical "1" takes 2.25ms to transmit, while a
logical "0" is only half of that, being 1.125ms. The recommended carrier duty-cycle is 1/4
or 1/3.
FIGURE 2-1 MODULATION
SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Chapter 2. Key Description
2.2 Key Description
The table below lists the corresponding hexadecimal of each of the seven keys.
TABLE 2-1 KEY DESCRIPTION
Key Function Address code Command code
ON/OFF 0x20 0x1C
Up (+) 0x20 0x10
Down (-) 0x20 0x1D
SET 0x20 0x11
Up (++) 0x20 0x18
Down (--) 0x20 0x15
RMB-CM11111_ Ver1.0_Page 2
SETOFF 0x20 0x19
© 2004-2009 Sure Electronics Inc.
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Small 7-key User-definable Remote Control
2.3 Example
The picture below shows a typical pulse train of the NEC protocol. With this protocol the
LSB is transmitted first. In this case Address 0x20 and Command 0x1C is transmitted. A
message is started by a 9ms AGC burst, which was used to set the gain of the earlier IR
receivers. This AGC burst is then followed by a 4.5ms space, which is then followed by
the Address and Command. Address and Command are transmitted twice. The second
time all bits are inverted and can be used for verification of the received message. The
total transmission time is constant because every bit is repeated with its inverted length.
If you're not interested in this reliability you can ignore the inverted values, or you can
expand the Address and Command to 16 bits each!
FIGURE 2-2 A TYPICAL PULSE TRAIN OF THE NEC PROTOCOL
A command is transmitted only once, even when the key on the remote control remains
pressed. Every 110ms a repeat code is transmitted for as long as the key remains down.
This repeat code is simply a 9ms AGC pulse followed by a 2.25ms space and a 560µs
burst.
FIGURE 2-3 COMMAND TRANSMISSION
FIGURE 2-4 REPEAT CODE TRANSMISSION
© 2004-2009 Sure Electronics Inc.
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SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Chapter 3. Specifications
FIGURE 3-1 SPECIFICATIONS
Parameter Value Remark
Power Voltage DC2.2V to DC3.2V IC Quiescent Current > 0.1 mA
IC Low-voltage Detection
Power Consumption
(Average)
Power Consumption
(Max)
Storage Temperature and
Humidity
Operating temperature
and humidity
Resonant Frequency
Straight Distance 8.0m
Leakage Current <5uA No key pressed
Power Supply DC2.2V to DC3.2V Material of Keys PET, force: 120-180g LED consumed 35mA ± 0.5mA VDD DC 3.0V
2.4V ± 0.1V (OTP)
2.4V ± 0.1V (Normal)
8 to10mA -
30 to 50mA -
-10℃ to + 60℃, 90％RH（MAX）
0℃ to + 55℃, 85%RH(MAX )
Resonant frequency: 455KHZ ±
1.5KHZ
Carrier wave: 37.9KHZ ±
125KHZ
Up, down, left, right direction
15° at min. 5.0m distance
Temp 25℃
Humidity: 65% to
80%RH
Temp 25℃
Humidity: 65% to
80%RH
Supply voltage: 3.0V
Test environment:
350Lux
Same receiver
Supply voltage: 3.0V
Test environment:
350Lux
Same receiver
-
-
-
- Direction
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SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Chapter 4. Appendix
FIGURE 4-1 CIRCUIT DIAGRAM OF SC6122
© 2004-2009 Sure Electronics Inc.
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SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
Chapter 5. Contact Us
Sure Electronics Co., Ltd.
5F, Zone A,
Qinhuai Technology Innovation Center
105-2 DaMing Rd (ZIP:210022)
Nanjing
P.R.China
Tel: +86-13601408832 (For technical questions only)
+86-25-66606340 (English service, from GMT1-10AM)
Fax: +86-25- 66606341-866
Website: www.sure-electronics.com
www.sure-electronics.net
RMB-CM11111_ Ver1.0_Page 6
© 2004-2009 Sure Electronics Inc.
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