PT2262\/2272 Codec integrated circuit introduction
Encoding and decoding chip PT2262\/PT2272 chip principle introduction:
PT2262\/2272 is a low power and low cost universal codec circuit manufactured by CMOS technology produced by Taiwan Pucheng Company. Pt2262\/2272 can have up to 12 bits (A0-A11) three-state address end pin (suspended, connected to high level, connected to low level), any combination can provide 531441 address code,PT2262 can have up to 6 bits (D0-D5) data end pin, set the address code and data code from the 17 pin serial output, Can be used for wireless remote control transmitting circuit.
The encoded signal sent by the encoding chip PT2262 consists of: Address code, data code, synchronization code constitute a complete code word, decoding chip PT2272 received the signal, its address code after two comparison check, VT pin output high level, at the same time, the corresponding data pin output high level, if the transmitter has been holding down the key, coding chip will continue to transmit. When the transmitter does not press the key, PT2262 is not connected to the power supply, and its 17 pin is low, so the 315MHz high-frequency transmission circuit does not work. When the key is pressed, PT2262 will be powered to work, and its 17 pin outputs the modulated serial data signal. When pin 17 is the high level period, the 315MHz high frequency transmitting circuit vibrates and transmits the constant amplitude high frequency signal, and when pin 17 is the low level period, the 315MHz high frequency transmitting circuit stops oscillating, so the high frequency transmitting circuit completely receives and controls the digital signal output by pin 17 of PT2262. Thus, the amplitude keying (ASK modulation) of the high-frequency circuit is equivalent to the amplitude modulation of 100%.
PT2262\/2272 Features: CMOS process manufacturing, low power consumption, fewer external components, RC oscillating resistance, wide operating voltage range: 2.6 ~ 15v, data up to 6 bits, address code up to 531441 kinds. Application: vehicle anti-theft system, home anti-theft system, remote control toys, other electrical remote control.
name
pin
description
A0-A11
1-8, 10-13
Address pin, used for address coding, can be set to \"0\
D0-D5
7-8, 10-13
At the data input end, there is a \"1\" that is, the code is issued, and the internal drop-down
虚信道连接
eighteen
Power supply positive (+)
译文
nine
Negative power supply (-)
瞄准角
fourteen
Coding start terminal, used for multi-data encoding transmission, low level effective;
OSC1
sixteen
Oscillation resistance input, and OSC2 resistance to determine the oscillation frequency;
OSC2
fifteen
Oscillating resistance oscillator output;
Dout
seventeen
Coded output (normally low)
In the specific application, the external oscillation resistance can be adjusted appropriately according to the need, the larger the resistance value, the slower the oscillation frequency, the larger the width of the code, and the longer the time of sending a frame. Most of the products on the website are 2262\/1.2M = 2272\/200K combination, a small number of products with 2262\/4.7M = 2272\/820K.
name
pin
description
A0-A11
1-8, 10-13
Address pin, used for address encoding, can be set to \"0\
D0-D5
7-8, 10-13
Address or data pin, as a data pin, only when the address code is consistent with 2262, the data pin can output a high level corresponding to the 2262 data end, otherwise the output is low, and the latch type can only be converted when the next data is received
虚信道连接
eighteen
Power supply positive (+)
译文
nine
Negative power supply (-)
喧嚣
fourteen
Data signal input, from the receiving module output
OSC1
sixteen
Oscillation resistance input, and OSC2 resistance to determine the oscillation frequency;
OSC2
fifteen
Oscillating resistance oscillator output;
室性心动过速
seventeen
Decode valid Verify that the output (normally low) decodes effectively to high (transient)
Address code and data code are represented by pulses of different widths, two narrow pulses represent \"0\"; Two wide pulses indicate \"1\"; A narrow pulse and a wide pulse represent \"F\
The above is a section of waveform intercepted from the signal output foot of the super regenerative receiving module, it can be clearly seen that the top half of the figure is a group of words, and there is a synchronization code between each group of words, so if we use the single-chip computer software to decode, the program as long as the synchronization code is judged, and then the pulse width of the following word can be recognized. The bottom part of the figure is an enlarged set of characters: a character consists of 12 bits AD code (address code plus data code, such as 8-bit address code plus 4-bit data code), each AD bit is represented by two pulses: two narrow pulses for \"0\"; Two wide pulses indicate \"1\"; A narrow pulse and a wide pulse represent \"F\
2262 transmits at least four sets of codes each time. Only when the same address code plus data code is detected twice in a row, 2272 will drive the corresponding data output end to high level and drive the VT end to high level simultaneously. Because of the characteristics of wireless transmission, the first group of characters is very susceptible to zero-level interference, which often produces error codes, so the program can be discarded.
PT2272 decoding chip has different suffixes, indicating different functions, there are L4\/M4\/L6\/M6 points, where L indicates the latch output, the data as long as the successful reception can always maintain the corresponding level state, until the next remote control data changes when the change. M stands for non-latched output, and the level of the data pin output is instantaneous and corresponds to whether the transmitter is transmitting or not, which can be used for point-like control. The suffixes 6 and 4 indicate that there are several parallel control channels. When 4-channel parallel data is used (PT2272-M4), the corresponding address code should be 8 bits. When 6-channel parallel data is used (PT2272-M6), the corresponding address code should be 6 bits.
PT2262\/2272 chip address code setting and modification:
In normal use, we generally use 8-bit address code and 4-bit data code, when the encoding circuit PT2262 and decoding PT2272 pin 1 ~ 8 for the address setting foot, there are three states to choose from: Suspended, connected to the positive power supply, ground three states, 3 to the power of 8 is 6561, so the address code does not repeat 6561 groups, only the transmitter PT2262 and the receiver PT2272 address code is exactly the same, can be paired to use, remote control module manufacturers in order to facilitate production management, When the remote control module PT2262 and PT2272 eight-bit address coding end all suspended, so that the user can easily choose a variety of coding states, if the user wants to change the address code, as long as PT2262 and PT2272 1-8 pin set the same can be, such as the transmitter PT2262 ground the first pin of the fifth pin connected to the positive power supply, The other pins are suspended, then the PT2272 of the receiver can achieve paired reception as long as the first pin is grounded and the fifth pin is connected to the positive power supply. When the two address codes are exactly the same, the corresponding D1-D4 terminals of the receiver output about 4V interlocked high level control signals, while the VT end also outputs decoded effective high level signals. Users can amplify these signals to drive relays, power triodes and other load remote control switches.
The remote control products provided by our website generally reserve the address code area, and choose from three states: suspended, connected to the positive power supply, and grounded. The factory is generally suspended, which is convenient for customers to modify the address code themselves. Here we take the jumper area of the commonly used superregenerative pin receiving board A-L4 as an example:
Users can see that the jumper area is composed of three rows of pads, the middle of the 8 pads is the PT2272 decoding chip of the first to the eighth pin, the leftmost with the word 1 is the first pin of the chip, the top row of pads marked with the word L, indicating and power together, if the multimeter measurement will be found and PT2272 with the 9th pin; The bottom row of pads is marked with the word H, indicating that it is connected with the positive power supply, and if measured with a multimeter, it will be found that it is connected with pin 18 of PT2272. The so-called set address code is to use solder to short-circuit the adjacent pad with solder bridge, for example, the first pin and the above pad L with solder short circuit is equivalent to setting the first pin of the PT2272 chip to ground, the same way the first pin and the following pad H with solder short circuit is equivalent to setting the first pin of the PT2272 chip to connect to the positive power supply, If you don't answer anything, it means you're hanging.
The rules for setting an address code are as follows: The address codes of the same system must be the same. Different systems can be distinguished by different address codes. What kind of address code to set is entirely up to the customer's liking.
PT2262 and PT2272 in addition to the address code must be completely consistent, the oscillation resistance must also match, otherwise the receiving distance will become close or even unable to receive, with the development of technology on the market a number of compatible chips, in actual use as long as the oscillation resistance slightly changed can be used, according to the actual use experience of our website, The following parameters have a good matching effect:
The resistance encoding the oscillation of the transmitting chip
Sync bit width
Narrow pulse width
Wide pulse width
Matching decoder receiving chip oscillating resistor
SC \/ PT2262
SC2260-R4
(Different manufacturers have different parameters)
PT2272\/SC2272
1.2米
200 k
1.5米
5.1米
5ms
150 microseconds
450 microseconds
270 k
2.2米
390 k
3.3米
12米
10 ms
320 microseconds
960 microseconds
680 k
4.7米
20米
14 milliseconds
450 microseconds
1350 microseconds
820 k
The 2262 IR is a special chip of the 2262 series for infrared remote control, which can be wired according to the following drawings. The receiving distance can be furthest by adjusting the size of the transmitter Rosc resistance, and the adjustment range of the transmitter resistance is 390 ~ 420K.
Note: Please choose 510K for SC2262IR DIP18 chip oscillation resistor with lot number 703780!
Here we can provide a SC series chip that is fully compatible with PT2262\/2272 chip, which can directly replace PT series chip without any peripheral changes, but the price is much cheaper than PT series, interested customers can buy samples for testing.
Two-in-line 2262 is $2 each
Wide-body 20-pin patch 2262 RMB 2.50 per piece
Each piece of dual-in-line 2272 M4 is 2 yuan
Super small patch SC2260-R4 is 2.50 yuan per piece
The two-in-line 2272 M6 is 2.5 yuan per piece
Dual in-line 2272 L4 2 yuan each
Dual in-line 2272 L6 is 2.5 yuan per piece
Wide-body 20-pin patch 2272 M6 2.5 yuan per piece
Dual in-line 2262 IR 2 yuan per tablet
Wide-body 20-pin patch 2272 L4 2.50 yuan per piece
Wide-body 20-pin Patch 2262 IR 2.50 yuan per piece
SC series are compatible with PT series, the price of more than 100PCS is discussed separately
RX3310 integrated circuit chip 6 yuan a piece
315 Sound meter element 2 yuan each 316.8M sound meter element 2.5 yuan each (with RX3310)
433 Sound meter element 2 yuan each 435M sound meter element 2.5 yuan each (with RX3310)