IrDA Standard Protocol Stack Controller 18-Pin PDIP

The MCP2140 is a cost-effective, low pin count (18-pin), easy-to-use device for implementing IrDA standard wireless connectivity. The MCP2140 provides support for the IrDA standard protocol “stack”, bit encoding/ decoding and low cost, discrete IR receiver circuitry. The serial and IR interface baud rates are fixed at 9600 baud. The serial interface and IR interface baud rates are dependent on the device frequency, but IrDA standard operation requires a device frequency of 7.3728 MHz. The MCP2140 will specify to the Primary Device the IR baud rate during the Discover phase. The MCP2140 can operate in Data Communication Equipment (DCE) and Data Terminal Equipment (DTE) applications, and sits between a UART and an infrared optical transceiver. The MCP2140 encodes an asynchronous serial data stream, converting each data bit to the corresponding infrared (IR) formatted pulse. IR pulses received are decoded and then handled by the protocol handler state machine. The protocol handler sends the appropriate data bytes to the Host Controller in UARTformatted serial data.

• Implements the IrDA® standard, including: - IrLAP - IrLMP - IAS - TinyTP - IrCOMM (9-wire “cooked” service class)
• Provides IrDA standard physical signal layer support including: - Bidirectional communication - CRC implementation - Fixed Data communication rate of 9600 baud
• Includes UART-to-IrDA standard encoder/ decoder functionality: - Easily interfaces with industry standard UARTs and infrared transceivers
• UART interface for connecting to Data Communications Equipment (DCE) or Data Terminal Equipment (DTE) systems
• Transmit/Receive formats (bit width) supported: - 1.63 µs
• Hardware UART Support: - 9.6 kbaud baud rate - 29 Byte Data Buffer Size
• Infrared Supported: - 9.6 kbaud baud rate - 64 Byte Data Packet Size
• Operates as Secondary Device
• Automatic Low Power mode - < 60 µA when no IR activity present (PHACT = L)