Four-button wireless remote control transmitter (IC PT2262 / SC2262)
There are two types of wireless remote
transmitters: electromagnetic waves and infrared. The working distance of the
infrared remote transmitter is short, and the infrared ray can only be
transmitted through the straight line, and can’t bypass the barrier. RF remote
transmitter uses the RF signal, it is transmitted in all directions, and the
signal can cross a certain barrier. The electromagnetic wave wireless remote
control system uses the transmitter to transmit the electromagnetic wave, and
the receiver extracts the electromagnetic wave and triggers various devices.
The electromagnetic wave wireless remote control system commonly used in
burglar alarm equipment, industrial equipment, doors and windows remote
control, car remote control.
The following describes a commonly
used four-button wireless remote control transmitter, the parameters are as
follows:
Working voltage: DC12V (23A / 12V
battery)
Working current: 10mA / 12V
Modulation method: ASK
Frequency: 315MHz / 433MHz
Coding type: fixed code
Working distance: 100 meters
Four-button wireless remote control transmitter circuit PCB diagram
Four-button
wireless remote control transmitter usually uses PT2262 or SC2262 encoding
chip.The PT2262 or SC2262 is a low-power encoding chip fabricated in CMOS
technology. The PT2262 or SC2262 has up to 12-bit (A0- A11) address-side pins.
These pins can be left floating, connect the high level or connect the low
level.They can combine up to 531441 sets of codes. The PT2262 or SC2262 has up
to six (D0-D5) data-side pins that allow them to combine different data.A
complete code consists of address code, data code and synchronization code,this
code from pin 17 of PT2262 or SC2262 chip to the data input of the remote
control terminal.After the receiving module receives the wireless signal, the
decoder chip will compare and verify the signal, and the corresponding data pin
of the decoder chip outputs the high-level signal to the amplifying circuit.
The pin diagram of
PT2262 or SC2262 is as follows:
Pin Description:
Name
|
Pin
|
Description
|
A0~A11
|
1~8、10~13
|
Address
pin, for address coding, can be set to "0", "1", "f
(dangling)"
|
D0~D5
|
7~8、10~13
|
Data
input
|
Vcc
|
18
|
Positive
power supply
|
Vss
|
9
|
Negative
power supply
|
TE
|
14
|
Coding
start-end
|
OSC1
|
16
|
Oscillation
resistance input
|
OSC2
|
15
|
Oscillation
resistance output
|
Dout
|
17
|
Coded
output
|
Comments
Post a Comment