PTC PT2262 - User Manual

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Remote Control Encoder PT2262

PT2262 v3.3 Page 1 Revised May 1998

Princeton Technology

Corp.

PT2262 is a remote control encoder paired 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 any

code collision and unauthorized code scanning possibilities.

r CMOS Technology

r Low Power Consumption

r Very High Noise Immunity

r Up to 12 Tri-State Code Address Pins

r Up to 6 Data Pins

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

r Single Resistor Oscillator

r Latch or Momentary Output Type

r Available in DIP and SO Package

r Car Security System

r Garage Door Controller

r Remote Control Fan

r Home Security/Automation System

r Remote Control Toys

r Remote Control for Industrial Use

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Summary

RF Operation

RF Operation Code Bits

Defines the basic modulated unit for RF transmission.

Address;Data (AD) Bit Waveform

Illustrates the waveform for address and data bits.

Synchronous (Sync.) Bit Waveform

Shows the waveform for synchronization bits.

Suggested oscillator resistor values

IR Operation

IR Operation Code Bits

Defines code bits for IR operation with 38KHz carrier.

IR Operation Code Word

Describes the structure of a code word in IR operation.

IR Operation Code Frame

Describes the structure of a code frame in IR operation.

Oscillator

Details oscillator frequency requirements for IR operation.

UHF Band Address-only (Zero Data) Transmitter Circuit

UHF Band Address-only (Zero Data) Zero-Stand-by Transmitter Circuit

Ordering Information

Package Code

Specifies the package type for ordering.

The PT2262 is a remote control encoder designed for use with the PT2272 decoder, forming a complete remote control encoding and decoding system. This device is primarily used to encode data and address pins into a serial coded waveform, making it suitable for RF (Radio Frequency) or IR (Infrared) modulation. Its robust encoding capabilities significantly reduce the likelihood of code collisions and unauthorized code scanning, enhancing security and reliability in remote control applications.

Function Description

The PT2262 operates by encoding a combination of address and data bits into a unique waveform. It can handle up to 12 tri-state address pins, offering a vast address space of up to 531,441 (or 3^12) possible codes. This extensive address capability is crucial for preventing interference and ensuring secure communication in multi-device environments. The encoder also supports up to 6 data pins, allowing for various control commands to be transmitted.

The encoding process involves converting the states of the A0-A5 and A6/D5-A11/D0 pins into a special waveform. These pins can be configured as tri-state, meaning they can be set to "0", "1", or "f" (floating). When used as address pins, all three states are utilized, while data pins are typically set to "0" or "1". The encoded waveform is then serially outputted via the DOUT pin when the Transmission Enable (TE) pin is pulled low (active low signal). This waveform is designed to be fed into either an RF modulator or an IR transmitter for wireless transmission.

The output waveform, referred to as a "Code Frame," consists of four continuous "Code Words." Each Code Word comprises 12 AD (Address/Data) bits followed by one Sync Bit. The structure of these bits is precisely defined by oscillating clock periods (α). An AD Bit "0" or "1" consists of two pulse cycles, each with 16 oscillating time periods, while an AD Bit "f" (floating) has a different pulse structure. The Synchronous Bit Waveform is 4 bits long with 1/8 bit width pulse.

Important Technical Specifications

Technology: CMOS Technology, ensuring low power consumption and high noise immunity.
Address Pins: Up to 12 tri-state address pins (A0-A11/D0), providing 3^12 (531,441) address codes.
Data Pins: Up to 6 data pins (D0-D5).
Operating Voltage: Wide range, Vcc = 4V to 15V.
Oscillator: Single resistor oscillator for precise timing.
Output Type: Supports both Latch and Momentary output types.
Package: Available in DIP (Dual In-line Package) and SO (Small Outline) packages.
Maximum Ratings:
- Supply Voltage (Vcc): -0.3V to 16.0V
- Input Voltage (VI): -0.3V to Vcc+0.3V
- Output Voltage (VO): -0.3V to Vcc+0.3V
- Maximum Power Dissipation (Pa): 300 mW (Vcc = 12V)
- Operating Temperature (Topr): -20°C to 70°C
- Storage Temperature (Tstg): -40°C to 125°C
DC Electrical Characteristics (Vcc=12V, OSC2=12V, A0-A11 Open):
- Stand-by Current (ISB): 0.1 µA (typical)
- DOUT Output Driving Current (IOH):
  - Vcc=5V, VOH=3V: -3 mA (min)
  - Vcc=8V, VOH=4V: -6 mA (min)
  - Vcc=12V, VOH=6V: -10 mA (min)
- DOUT Output Sinking Current (IOL):
  - Vcc=5V, VOL=3V: 2 mA (min)
  - Vcc=8V, VOL=4V: 5 mA (min)
  - Vcc=12V, VOL=6V: 9 mA (min)

Usage Features

Flexible Address/Data Configuration: The tri-state capability of the address/data pins allows for highly customizable code generation. This flexibility enables designers to create unique codes for various applications, minimizing the risk of unauthorized access or interference.
RF and IR Compatibility: The encoded waveform is suitable for both RF and IR modulation, making the PT2262 versatile for different wireless communication needs. This allows for a broad range of applications, from garage door openers to car security systems and home automation.
Oscillator Customization: The built-in oscillator circuitry allows for precise frequency adjustment by connecting an external resistor between OSC1 and OSC2 pins. This feature is critical for matching the encoder's frequency with the decoder (PT2272) to ensure reliable communication. For RF applications, the encoder OSC frequency can range from R=510KΩ to R=4.7MΩ, while for IR applications, a 430KΩ-470KΩ resistor is recommended for a 76 kHz oscillator frequency.
Code Frame Transmission: The PT2262 transmits a Code Frame (four Code Words) when the TE pin is pulled low. If TE remains low after a frame transmission, another frame is automatically sent, allowing for continuous signal transmission.
Application Versatility: The PT2262 is suitable for a wide array of remote control applications, including:
- Car Security Systems
- Garage Door Controllers
- Remote Control Fans
- Home Security/Automation Systems
- Remote Control Toys
- Remote Control for Industrial Use

Maintenance Features

Robust Design: CMOS technology contributes to the device's inherent reliability and resistance to noise, reducing the need for frequent maintenance or troubleshooting.
Wide Operating Temperature Range: The broad operating temperature range (-20°C to 70°C) ensures stable performance in diverse environmental conditions, minimizing temperature-related failures.
Standard Packaging: Availability in standard DIP and SO packages simplifies integration into existing circuit designs and facilitates replacement if necessary.
Oscillator Resistor Selection: The manual provides recommended oscillator resistor values for both the PT2262 and PT2272, aiding in proper circuit design and ensuring optimal performance. It also highlights that if the PT2272 supply voltage is lower than 5V, a lower oscillator resistor value is needed for both devices, which is an important consideration for power management and compatibility.

The PT2262, when paired with the PT2272, offers a comprehensive and secure solution for various remote control applications, characterized by its flexible encoding, wide operating voltage, and robust performance.

PTC PT2262 Specifications

General

Brand	PTC
Model	PT2262
Category	Media Converter
Language	English

PTC PT2262 - User Manual

Summary

Description

Features

Applications

Block Diagram

Pin Configuration

Pin Description

Functional Description

RF Operation

RF Operation Code Bits

Address;Data (AD) Bit Waveform

Synchronous (Sync.) Bit Waveform

Code Word

Code Frame

Single Resistor Oscillator

Encoder OSC Frequency

Decoder OSC Frequency

Suggested oscillator resistor values

IR Operation

IR Operation Code Bits

IR Operation Code Word

IR Operation Code Frame

Oscillator

Operation Flow Chart

Application Circuit

UHF Band Address-only (Zero Data) Transmitter Circuit

UHF Band Address-only (Zero Data) Zero-Stand-by Transmitter Circuit

Infrared Ray 6-Data Circuit

Absolute Maximum Rating

DC Electrical Characteristics

Ordering Information

Package Code

Output Type

PTC Prefix

Package Information

18 Pins, SO Package

20 Pins, SO Package