MCP2122-E/PG Microchip Technology, MCP2122-E/PG Datasheet - Page 3

• Manufacturer Part Number: MCP2122-E/PG
• Description: IC ENCODER/DECODER INFRARED 8DIP
• Manufacturer: Microchip Technology
• Type: Infrared Encoder/Decoderr

Specifications of MCP2122-E/PG

• Applications: Data-Logging, Data Exchange
• Voltage - Supply, Analog: 1.8 V ~ 5.5 V
• Voltage - Supply, Digital: 1.8 V ~ 5.5 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• For Use With: MCP212XDM - BOARD DEVELOPMENT IRDA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.0
The MCP2122 is a stand-alone IrDA standard encoder/
decoder device that is pinout-compatible with the
Agilent
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
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.
FIGURE 1-1:
 2004 Microchip Technology Inc.
Host Controller
®
®
PICmicro
HSDL-7000 encoder/decoder.
TFDU 4100) or it could be implemented with
DEVICE OVERVIEW
MCU
Clock
®
(I/O)
SO
SYSTEM BLOCK DIAGRAM
SI
Host UART
Interface
16XCLK
RESET
TX
RX
Protocol Handler
Preliminary
Reset
Logic
MCP2122
Decode
Encode
Clock
Logic
TABLE 1-1:
Infrared Technology Features:
• Universal standard for connecting portable
• Effortless implementation
• Economical alternative to other connectivity
• Reliable, high-speed connection
• Safe to use in any environment; can even be used
• Eliminates the hassle of cables
• Allows PCs and non-PCs to communicate with
• Enhances mobility by allowing users to easily
1.1
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
Serial Communications:
Baud Rate Selection:
Low-power Mode:
Packages:
computing devices
solutions
during air travel
each other
connect
RXIR
TXIR
Applications
Features
Interface
MCP2122 FEATURES
OVERVIEW
IR
Transceiver
TFDU 4100
MCP2122
TXD
RXD
Optical
8-pin SOIC
8-pin PDIP
MCP2122
UART, IR
16XCLK
DS21894B-page 3
Yes