● Remote control toys
● Home anti-theft system
● Other industrial remote controls.
Special point
● CMOS process manufacturing, low power consumption &; #6 1548; ● The maximum number of address codes is 59,049 (3).
● Less external application circuit components &; #6 1548; ● The coded transmission is triggered by the high-level input of the data pin.
Low single-ended resistance oscillation circuit &; #6 1548; ● wide working voltage range: 2.4V ~ 13V
●& amp； #6 1472; There are three types of data codes: 2, 4 or 6 bits ● DIP 16 or SOP 16 package.
applied range
● Vehicle anti-theft system● &; #6 1472; Remote control toy
●& amp； #6 1472; Family anti-theft system ●&; #6 1472; Other industrial remote controls
Pin diagram
Functional model encoder
Type-Wireless Electricity
Infrared remote control application
Remote control application decoder
Model: SC2260-R6 66 √ 729 SC2272-X6SOP16, DIP16SC2260-R4 √ SC2272-X4SOP16, DIP16SC2260-.
Pin Description Pin Name Pin Label Input/Output Description A0~A5 1~6 Input 0~5 code address pin. SC2260 determines the coded waveforms from bit 0 to bit 5 by detecting these six tri-state pins. Each pin can be set to "0", "1" or "f" (floating point) A6/D5 ~ A9/D27 ~ 8,/kloc-0 ~1,and 6~9 code address pins or 5~2 data pins can be input. SC2260 determines the coded waveforms from bit 6 to bit 9 by detecting these four tri-state pins. When used as an address pin, it can be set to "0", "1" or "f" (floating point) respectively; When they are used as data pins, they can only be set to "0" or "1" (with internal pull-down resistors). D 1, D0 12, 13 input 1~0 data pin. There is a pull-down resistor inside, which can only be set to "0" or "1"OSC14 as the input of the single-ended resistance oscillator. The resistance connected to the positive terminal (Vcc) of the power supply determines the oscillation frequency Dout 15. Input/output coded output terminal (usually "0") VSS 9-negative electrode (-)VCC 16- positive electrode (+) limit parameter symbol range unit power supply voltage Vcc 2.4~6543. 8+03.0 V input voltage VI Vss-0.3~Vcc+0.3 V output voltage Vo Vss-0.3~Vcc+0.3 V maximum power consumption (Vcc= 13V). Pa 350 mw working temperature Topr -20~+70℃ storage temperature Tstg -40~+ 125℃ DC characteristic parameters (unless otherwise specified, Tamb=25℃) parameter sign test conditions minimum typical maximum unit power supply voltage VCC-2.4- 13 V static current ISBVCC =
The oscillator stops vibrating.
A0~A 1 1 open circuit -0.5 1μa output drive current IOHVCC = 3v, voh =1.5v-3-mavcc =12v, Voh = 6V-22-Madout.
When the data terminal inputs high level, SC2260 encodes the code address and code data set on A0~A5 and A6/D5~A 1 1/D0 terminals into a set of waveforms, which are sent by the Dout terminal and emitted by the external RF system. The transmitted RF signal is received, demodulated, shaped and restored into coded waveform by RF receiving circuit, and then decoded by SC2272 to control the corresponding port output. This process completes a complete remote coding and decoding process.
bit code
Bit code is the basic unit of coded waveform, which can be divided into AD (address, data) and SYNC bit (synchronization).
Corresponding to the low, high or floating state of the address or data terminal level, the AD bit can be set to "0", "1" and "f" respectively. Each waveform consists of two pulse periods, and each pulse period contains 128 clock periods, as shown in the following figure:
The length of the synchronization bit is 4 AD bits, including pulses with a bit width of 1/8AD. See the figure below for details:
Character binary code
A word code consists of 12 AD bit code and 1 SYNC bit code. 12 bit AD code is determined by the state of A0~A5 and A6/D5~A 1 1/D0 terminals during transmission. When SC2260 uses the transmission form with data, the address code bits will be reduced accordingly. For example, the encoding setting is in the form of 8-bit address code and 4-bit data code, and its transmission format is as follows: 8-bit address code and 4-bit data code synchronization bits SC2260/SC2272 can have at most 12-bit address code (including 6-bit address/data code bits). The following figure shows the correspondence between code bits and pins.
The bit codes A0~A5 and A6/D5 ~ A 1/D0 are determined by the state of pins A0~A5 and A6/D5 ~ a1/d0. For example, when A0 (pin 1) is set to high level (VCC), the corresponding bit code A0 has a code shape of "1"; Similarly, when A0 (pin 1) is set to low level or paused, the bit code A0 correspondingly appears a bit "0" code shape or a bit "f" code shape.
When SC2260 is still detected as "1" at the data terminal (that is, the input level is high), the Dout terminal outputs a word code; If any data terminal is still detected as "1" at the end of this code, SC2260 continues to send another code; Obviously, if it is detected that all data terminals are "0" at the end of a word, SC2260 stops transmitting and enters the power saving mode.
Oscillating resistance matching
By connecting a resistor between OSC and VCC, the built-in oscillation loop of SC2260 can form an oscillator. In order to ensure that SC2272 can correctly decode the received waveform, the following figure gives the suggested matching resistance: Rosc (SC2260) Fosc (Sequential Microcontroller) SC2272/PT2272 3.3m 365kHz 220kH4.7m 255kHz 270k5.1M 240kHz 330k6.8m1990.
Typical application circuit
In the specific application, the external resistance can be appropriately adjusted as needed. The larger the resistance, the smaller the oscillation frequency, the wider the code width and the longer the code sending time.