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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2122 Datasheet

Infrared Encoder/Decoder

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MCP2122 pdf
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MCP2122
Infrared Encoder/Decoder
Features
• Pinout compatible with HSDL-7000
• Compliant with IrDA® Standard Physical Layer
Specification (version 1.3)
• UART to IrDA Standard Encoder/Decoder
- Interfaces with IrDA Standard Compliant
Transceiver
• Baud Rates:
- Up to IrDA Standard 115.2 Kbaud Operation
• Transmit/Receive Formats (Bit Width) Supported:
- 1.63 µs
• Low-power Mode (2 µA at 1.8V, +125°C)
CMOS Technology
• Low-voltage operation
• Extended temperature range
• Low power consumption
Package Types
PDIP, SOIC
16XCLK
TX
RX
VSS
1
2
3
4
8
7
6
5
Block Diagram
MCP2122
TX Encode
RESET
16XCLK
RX
Reset
Logic
Baud Rate
Generator
Decode
VDD
TXIR
RXIR
RESET
TXIR
RXIR
IrDA Family Selection
Device
Baud Rate
Host
UART
IR
Encoder
/
Decoder
Protocol
Layer
Handler
Clock
Source
Host UART
Baud Rate
Selection
Comment
MCP2120
MCP2122
MCP2140
2400 -
312,500 (1)
2400 -
115,200 (1)
9600
2400 -
312,500 (1)
2400 -
115,200 (1)
9600
Yes
Yes
Yes
No
XTAL
HW/SW
No
IrCOMM
(3)
16XCLK By 16XCLK Extended Temperature Range
(-40°C to +125°C)
XTAL None - Fixed
MCP2150 9600 -
9600 -
115,200 (2) 115,200 (2)
Yes
IrCOMM XTAL
(3)
HW Host UART easily interfaces to
a PC’s serial port (DTE)
MCP2155 9600 -
9600 -
115,200 (2) 115,200 (2)
Yes
IrCOMM XTAL
(3)
HW Host UART easily interfaces to
a modem’s serial port (DCE)
Note 1: The host UART and the IR operate at the same baud rates.
2: The host UART and IR baud rates operate independent of each other.
3: Supports the 9-wire “cooked” service class of the IrCOMM Application Layer Protocol.
2004 Microchip Technology Inc.
Preliminary
DS21894B-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2122 Datasheet

Infrared Encoder/Decoder

No Preview Available !

MCP2122 pdf
MCP2122
NOTES:
DS21894B-page 2
Preliminary
2004 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2122 Datasheet

Infrared Encoder/Decoder

No Preview Available !

MCP2122 pdf
MCP2122
1.0 DEVICE OVERVIEW
The MCP2122 is a stand-alone IrDA standard encoder/
decoder device that is pinout-compatible with the
Agilent® HSDL-7000 encoder/decoder.
The MCP2122 has two interfaces: the host UART
interface and the IR interface (see Figure 1-1). The host
UART interfaces to the UART of the Host Controller.
The Host Controller is the device in the embedded
system that transmits and receives the data. The IR
interface connects to an infrared (IR) optical transceiver
circuit that converts electrical pulses into IR light
(encode) and converts IR light into electrical pulses
(decode). This IR optical transceiver circuit could be
either a standard infrared optical transceiver (such as a
Vishay® TFDU 4100) or it could be implemented with
discrete components. For additional information, please
refer to AN243, “Fundamentals of the Infrared Physical
Layer” (DS00243).
When the Host Controller transmits the UART format
data, the MCP2122 receives this UART data and
encodes (modulates) it bit by bit. This encoded data is
then output as electrical pulses to the IR transceiver.
The IR transceiver will then convert these electrical
pulses to IR light pulses.
The IR transceiver also receives IR light pulses (data),
which are outputted as electrical pulses. The MCP2122
decodes (demodulates) these electrical pulses, with
the data then being transmitted by the MCP2122
UART. This modulation/demodulation method is
performed in accordance with the IrDA standard.
Table 1-1 shows an overview of some of the device
features. Figure 1-1 shows a typical application block
diagram. Table 1-2 shows the pin definitions of the
MCP2122 during normal operation.
TABLE 1-1:
MCP2122 FEATURES
OVERVIEW
Features
MCP2122
Serial Communications:
Baud Rate Selection:
Low-power Mode:
Packages:
UART, IR
16XCLK
Yes
8-pin PDIP
8-pin SOIC
Infrared Technology Features:
• Universal standard for connecting portable
computing devices
• Effortless implementation
• Economical alternative to other connectivity
solutions
• Reliable, high-speed connection
• Safe to use in any environment; can even be used
during air travel
• Eliminates the hassle of cables
• Allows PCs and non-PCs to communicate with
each other
• Enhances mobility by allowing users to easily
connect
1.1 Applications
Some applications where an IR interface (MCP2122)
could be used include:
• Data-Logging/Data Exchange
• System Setup
• System Diagnostic Read Out
• Manufacturing Configuration
• Host Controller Firmware Updates
• System Control
FIGURE 1-1:
SYSTEM BLOCK DIAGRAM
Host Controller
PICmicro®
MCU
SO
Host UART
Interface
Protocol Handler
MCP2122
TX Encode
TXIR
IR Optical
Interface Transceiver
TFDU 4100
TXD
SI
Clock
(I/O)
RESET
16XCLK
RX Decode
Reset
Logic
Clock
Logic
RXIR
RXD
2004 Microchip Technology Inc.
Preliminary
DS21894B-page 3




Part Number MCP2122
Description Infrared Encoder/Decoder
Maker Microchip Technology
Total Page 30 Pages
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