Remote Control Encoder--PT2262

Description:

PT2262 is a remote control encoder with PT2272 utilizing CMOS Technology. It encodes data and address pins into a serial coded waveform suitable for RF or IR modulation. PT2262 has a maximum of 12 bits of tri-state address pins providing up to 531,441 (or 3 ) address codes; thereby, drastically reducing and code collision and unauthorized code scanning possibilities.

PT2262 encode the code address and data set at A0 ~ A5 and A6/D5 ~ A11/D0 into a special waveform and output is to the DOUT when TE is pulled to "0" (low state). This waveform is fed to either the RF modulator or the IR transmitter for transmission. The transmitted radio frequency or infrared ray is received by the RF demodulator or IR receiver and reshaped to the special waveform. PT 2272 is then used to decode the waveform and set the corresponding output pin(s). Thus completing a remote control encoding and deciding function.

The build-in oscillator circuitry of PT 2262 allows a precision oscillator to be constructed by connecting an external resister between OSC1 and OSC2 pins. For PT 2272 to decode correctly the received waveform, the oscillator frequency of PT 2272 must be 2.5 ~ 8 times that of transmitting PT 2262.

An address/data bit can be designated as bit "0", "1" , or "f" if it is in low, high or floating state respectively . One bit waveform consists of 2 pulse cycle has 16 oscillating time periods. For further details, refer to diagram below:

Pin Configuration:

PT2262

PT2262-S18

PT2262-IR

PIN NAME	I/O	DESCRIPTION	PIN No.
A0 ~ A5	I	Code address pin Nos. 0 ~5. These six tri-state pins are detected by PT 2272 to determine the encoded waveform bit 0 ~ bit 5. Each pin can be set to "0", "1" or "f"(floating).	1 ~ 6
A6/D5 ~ A11/D0	I	Code address pin Nos. 6 ~ 11/data pin Nos. 5 ~ 0. These six tri-state pins are detected by PT 2262 to determine the encoded waveform bit 6 ~ bit 11. When these pins are used as address pins, they can be set to "0", "1" or "f"(floating). When these pins are used as data PINS, THEY CAN BE SET ONLY TO "0" OR "1".	7 ~ 8 12 ~ 15
TE	I	Transmission enable. Active low signal. PT 2262 outputs the encoded waveform to DOUT when this pin is pulled to low.	16
OSC1	I	Oscillator pin No. 1. A resistor connected between OSC1 and OSC2 determine the fundamental frequency of PT 2272.	17
OSC2	O	Oscillator pin No. 2. A resistor connected between OSC1 and OSC2 determine the fundamental frequency of PT 2272.	18
DOUT	O	Data output pin. The encoded waveform is serially output to this pin. When PT 2262 is not transmitting, DOUT outputs low (Vss) voltage.	19
Vcc		Positive power supply	20
Vss		Negative power supply	9

PT 2272 Decoding Section

PT 2272 is a remote control decoder paired with PT 2262 utilizing CMOS technology. It has a maximum of 12 bits of tri-state address pins providing up to 531,441 address codes; thereby drastically reducing any code collision and unauthorized code scanning possibilities. PT 2272 is available in several options to suit every application needs: variable number of data output pins, latch or momentary output type.

PT 2272 decodes the waveform received and fed into the DIN pin. The waveform is decoded into code word that contains the address, data and sync bits. The decoded address bits are compared with the address set at the address input pins. If both addresses match for 2 consecutive code words, PT 2272 drives:

The data output pin(s) whose corresponding data bit(s) is then decoded to be a "1" bit, and
The VT output to high voltage (high state).

The build-in oscillator circuitry of PT 22272 allows a Precision oscillator to be constructed with only an external resistor. For the PT 2272 to decode correctly the waveform that was received, the oscillator frequency of PT 2272 must be 2.5 ~ 8 times that of the transmitting PT 2262.

An address/data bit can be designed as bit "0", "1" or "f" if it is in low, high or floating state respectively. One bit waveform consists of 2 pulse cycles. Each pulse has 16 oscillating time periods. For further details, refer to the diagram below:

PIN NAME	I/O	DESCRIPTION	PIN No.
A0 ~ A5	I	Code address pin Nos. 0 ~5. These six tri-state pins are detected by PT 2272 to determine the encoded waveform bit 0 ~ bit 5. Each pin can be set to "0", "1" or "f"(floating).	1 ~ 6
A6/D5 ~ A11/D0	I/O	Code address pin Nos. 6 ~ 11/data pin Nos. 5 ~ 0. These six pins are use as higher address input bits or data output pins depending on the version(type) of PT 2272 used. When used as address inputs, these pins are tri-state input pins and each pin can be set to "0", "1" or "f". When used as output pins, these pins are driven to Vcc if The address decoded form the waveform that was received matches the address setting at the address input pins. The corresponding data bits received is a "1" bit. Otherwise, they are driven to Vss.	7 ~ 8 12 ~ 15
DIN	I	Data Input pin. The encoded waveform received is serially fed to PT 2272 at this pin.	16
OSC1	I	Oscillator pin No. 1. A resistor connected between OSC1 and OSC2 determine the fundamental frequency of PT 2272.	17
OSC2	O	Oscillator pin No. 2. A resistor connected between OSC1 and OSC2 determine the fundamental frequency of PT 2272.	18
VT	O	Valid transmission. Active high signal. VT in high state signifies that PT 2272 receives valid transmission waveform.	19
Vcc		Positive power supply	20
Vss		Negative power supply	9

Features:

Ø CMOS Technology

Ø Low Power Consumption

Ø Very High Noise Immunity

Ø Up to 6 Data Pins

Ø Wide Range of Operating Voltage: Vcc= 4 ~ 15 Volts

Ø Single Resistor Oscillator

Ø Latch or Momentary Output Type

Ø Available in DIP and SO Package

Applications:

Ø Car Security System

Ø Garage Door Controller

Ø Remote Control Fan

Ø Home Security/ Automation System

Ø Remote Control Toys

Ø Remote Control for Industrial Use

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