Sure Electronics 7-key user-definable infrared remote control User manual

Small 7-key User-definable
Remote Control
User’s Guide
©2004-2009 Sure Electronics Inc. RMB-CM11111_Ver1.0

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc. RMB-CM11111_Ver1.0_Page i
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

Small 7-key User-definable Remote Control
©2004-2009 Sure Electronics Inc
RMB-CM11111_Ver1.0_Page ii
NOTES:
Product Version ：Ver 1.0
Document Version ：Ver 1.0

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc.
Chapter 1. Overview
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 utilizes 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.
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.
1.2 Features
yCompact and durable
yBlack, ABS packaging
ySmooth rounded shape
yIntegrated with seven dome keys
yPowered by two 1.5V AA batteries
yLong service time: 3 years
yAvailable to use keys 100,000 times
yLow power consumption
1.3 Applications
yVolume control in amplifier application
ySmart Home like color, brightness and power control of lights, movement control of
curtains
yOther remote control applications
RMB-CM11111_Ver1.0_Page 1

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc.
Chapter 2. Key Description
2.1 NEC Protocol
This remote control utilizes NEC IR protocol for encoding.
2.1.1 Features
y8 bit address and 8 bit command length
yAddress and command are transmitted twice for reliability
yPulse distance modulation
yCarrier frequency of 38kHz
yBit time of 1.125ms or 2.25ms
2.1.2 Modulation
The NEC protocol uses pulse distance encoding of the bits. Each pulse 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
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
SETOFF 0x20 0x19
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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. RMB-CM11111_Ver1.0_Page 3

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc.
FIGURE 3-1 SPECIFICATIONS
Chapter 3. Specifications
Parameter Value Remark
Power Voltage DC2.2V to DC3.2V -
IC Quiescent Current > 0.1 mA
IC Low-voltage Detection 2.4V ± 0.1V (OTP)
2.4V ± 0.1V (Normal) -
Power Consumption
(Average) 8 to10mA -
Power Consumption
(Max) 30 to 50mA -
Storage Temperature and
Humidity -10℃to + 60℃, 90％RH（MAX）-
Operating temperature
and humidity 0℃to + 55℃, 85%RH(MAX ) -
Resonant Frequency
Resonant frequency: 455KHZ ±
1.5KHZ
Carrier wave: 37.9KHZ ±
125KHZ
Temp 25℃
Humidity: 65% to
80%RH
Straight Distance 8.0m
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
Up, down, left, right direction
15° at min. 5.0m distance -Direction
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
RMB-CM11111_Ver1.0_Page 4

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc.
Chapter 4. Appendix
FIGURE 4-1 CIRCUIT DIAGRAM OF SC6122
RMB-CM11111_Ver1.0_Page 5

SMALL 7-KEY USER-DEFINABLE
REMOTE CONTROL
USER’S GUIDE
©2004-2009 Sure Electronics Inc.
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: [phone] (For technical questions only)
[phone] (English service, from GMT1-10AM)
Fax: [phone]
Website: www.sure-electronics.com
www.sure-electronics.net
RMB-CM11111_Ver1.0_Page 6