- 品牌/型号：原装进口/PT2272-L4
- 类型：通信IC
- 品牌：原装进口
- 型号：PT2272-L4
- 电源电压：5~24V
- 频率：315M/433M
- 用途：报警器
- 封装：DIP
- 批号：见IC表面
- 属性：ROHS
Remote Control Decoder PT2272
DESCRIPTION
PT2272 is a remote control decoder paired with PT2262 utilizing CMOS Technology. It has 12-bit of
tri-state address pins providing a maximum of 531,441 (or 312) address codes; thereby, drastically
reducing any code collision and unauthorized code scanning possibilities. PT2272 is available in
several options to suit every application need: variable number of data output pins, latch or momentary
output type.
FEATURES
• CMOS Technology
• Low Power Consumption
• Very High Noise Immunity
• Up to 12 Tri-State Code Address Pins
• Up to 6 Data Pins
• Wide Range of Operating Voltage: VCC=4~15V
• Single Resistor Oscillator
• Latch or Momentary Output Type
• Available in DIP and SOP
APPLICATIONS
• Car Security System
• Garage Door Controller
• Remote Control Fan
• Home Security/Automation System
• Remote Control Toys
• Remote Control for Industrial Use
SINGLE RESISTOR OSCILLATOR
The built-in oscillator circuitry of PT2272 allows a precision oscillator to be constructed with only an
external resistor. For the PT2272 to decode correctly the waveform that was received, the oscillator
frequency of PT2272 must be 2.5~8 times that of the transmitting PT2262. It is a good practice to
center the PT2272 oscillator frequency in this window to gain best window margin at both sides. The
typical oscillator with various resistor values is shown below for both PT2262 and PT2272.
Encoder OSC Frequency Decoder OSC Frequency
IR OPERATION
In the IR Type of Operation, the functions are similar to the above descriptions, except that the output
waveform carried by PT2262-IR has a frequency of 38KHz. Details are as follows.
CODE BITS
The Code Bits are further modulated with a 38KHz carrier frequency and can be “0”, “1” or “f” bit. Their
waveforms are shown in the diagram below.
Note: = 2 clock lengths
CODE WORD
A Code Word is made up of code bits and the format is the same as that of the RF Code Frame.
CODE FRAME
Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF Type of
Operation.
OSCILLATOR
PT2262-IR is specially designed for infrared remote control applications and its output waveform
carries 38KHz frequency. To get the 38KHz carrier frequency at the data output, the oscillator
frequency must be 76KHz. A 440KΩ resistor connected between OSC1 and OSC2 pins of PT2262-IR
is recommended. Moreover, for a matching decoder frequency, 1MΩ resistor connected between the
OSC1 and OSC2 pins of PT2272 is also recommended.
VALID TRANSMISSION
When PT2272 receives a transmission code word, it initially checks whether this is a valid transmission.
For a transmission to be valid, (1) it must be a Complete Code Word, and (2) the Address Bits must
match the Address Setting at the Address Pins. After two consecutive valid transmissions, PT2272 (1)
drives the data pins according to the data bits received, and (2) raises VT to high voltage (high state).
The timings are shown in the following diagram.
ta = 8 OSC clock width
tb = 1 OSC clock width
tc = 2 code word width
LATCH OR MOMENTARY DATA OUTPUT TYPE
PT2272 uses either the latch or the momentary data output type depending on the PT2272 version
used. The latch type (PT2272-Lx) activates the data out during transmission and this data is sustained
in the memory until another data is inputted or entered. A momentary type (PT2272-Mx), on the other
hand, activates the data out only during transmission. In the momentary type, the data does not remain
in the memory after the transmission is completed. Please refer to the diagram below:
OPERATION FLOWCHART
DECODER WITHOUT DATA OUTPUT PIN
1. When Power is turned on, PT2272 activates the Stand-By Mode.
2. It then searches for signals. If there is no signal received, it remains in the Stand-By Mode;
otherwise, the address bits received are compared with the address configuration of the pins.
3. The VT goes high signifying the validation of transmission only when there are two (2) continuous
frames that contain matched address bits; otherwise, VT will not be activated and the Stand-By
Mode remains active.
4. Then, the Address Bits are again checked. Two continuous mismatches of the address bits would
disable the VT and make the Stand-By Mode active; otherwise, the address bits are continuously
checked.
Power ON
DECODER WITH DATA OUTPUT PINS
1. When Power is turned ON, PT2272 activates the Stand-By Mode.
2. It then searches for signals. If there is no signal received, it remains in the Stand-By Mode;
otherwise, the address bits are compared with the address configuration of the pins.
3. Whenever the Address Bits in a Frame match with that of the Address Configuration of the Pin, the
data bits are stored into the memory. Also, when this IC finds two (2) continuous and identical data
having the same address bits, the data output(s) is activated and the VT is enabled. The VT is
disabled when there are 2 continuous mismatched addresses. For the momentary type, the data
output is reset; while for the latch type, the data output is sustained.
ORDER INFORMATION
Valid Part No. Package Type Data Bits Output Type Top Code
PT2272A-M2-S18 18 PINS, SOP 2 Momentary PT2272
Valid Part No. Package Type Data Bits Output Type Top Code
PT2272 18 PINS, DIP - * PT2272
PT2272-L2 18 PINS, DIP 2 Latch PT2272-L2
PT2272-L3 18 PINS, DIP 3 Latch PT2272-L3
PT2272-L4 18 PINS, DIP 4 Latch PT2272-L4
PT2272-L5 18 PINS, DIP 5 Latch PT2272-L5
PT2272-L6 18 PINS, DIP 6 Latch PT2272-L6
PT2272-M2 18 PINS, DIP 2 Momentary PT2272-M2
PT2272-M3 18 PINS, DIP 3 Momentary PT2272-M3
PT2272-M4 18 PINS, DIP 4 Momentary PT2272-M4
PT2272-M5 18 PINS, DIP 5 Momentary PT2272-M5
PT2272-M6 18 PINS, DIP 6 Momentary PT2272-M6
PT2272A-L2 18 PINS, DIP 2 Latch PT2272A-L2
PT2272A-M2 18 PINS, DIP 2 Momentary PT2272A-M2
Valid Part No. Package Type Data Bits Output Type Top Code
PT2272-S 20 PINS, SOP - * PT2272-S
PT2272-L3S 20 PINS, SOP 3 Latch PT2272-L3S
PT2272-L4S 20 PINS, SOP 4 Latch PT2272-L4S
PT2272-L5S 20 PINS, SOP 5 Latch PT2272-L5S
PT2272-L6S 20 PINS, SOP 6 Latch PT2272-L6S
PT2272-M2S 20 PINS, SOP 2 Momentary PT2272-M2S
PT2272-M3S 20 PINS, SOP 3 Momentary PT2272-M3S
PT2272-M4S 20 PINS, SOP 4 Momentary PT2272-M4S
PT2272-M5S 20 PINS, SOP 5 Momentary PT2272-M5S
PT2272-M6S 20 PINS, SOP 6 Momentary PT2272-M6S
PT2272A-L2S 20 PINS, SOP 2 Latch PT2272A-L2S
PT2272A-M2S 20 PINS, SOP 2 Momentary PT2272A-M2S
Note: *=use VT (Valid Transmission).
Remote Control Decoder PT2272
Notes:
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold Flash, protrusion or gate
burrs shall not exceed 0.15 mm (0.006 in) per side.
3. Dimension “E” does not include interlead flash or protrusions. Interlead flash or protrusions shall not
exceed 0.25 mm (0.010 in) per side.
4. The chamfer on the body is optional. It is not present, a visual index feature must be located within
the crosshatched area.
5. “L” is the length of the terminal for soldering to a substrate.
6. N is the number of the terminal positions (N=20)
7. The lead width “B” as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not
exceed a maximum value of 0.61 mm (0.24 in).
8. Controlling dimension: MILLIMETER.
9. Refer to JEDEC MS-013, Variation AC.
JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.