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MCP2122-E/P 其他数据使用手册 - Microchip（微芯）
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Microchip（微芯）
分类:
接口芯片
封装:
DIP-8
描述:
MICROCHIP MCP2122-E/P 芯片, 红外编码器/解码器, DIP-8
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MCP2122-E/P数据手册
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2004 Microchip Technology Inc. Preliminary DS21894A-page 3
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,
which converts electrical pulses into IR light (encode)
and converts IR light into electrical pulses (decode).
This IR optical transceiver circuit could be either a stan-
dard infrared (IR) optical transceiver (such as a Vishay
®
TFDU 4100) or it could be implemented with discrete
components. For additional information, please refer to
Application Note 243, “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) the data bit by bit. This encoded
data is then output as electrical pulses to the IR Trans-
ceiver. 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 transmitted by the MCP2122 UART. This
modulation and 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 in normal operation.
TABLE 1-1: MCP2122 FEATURES
OVERVIEW
Infrared Technology Features:
• Universal standard for connecting portable
computing devices
• Easy, 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 PC’s and non-PC’s to communicate to
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
Features MCP2122
Serial Communications: UART, IR
Baud Rate Selection: 16XCLK
Low Power Mode: Yes
Resets: (and Delays) RESET pin (none)
Packages: 8-pin PDIP
8-pin SOIC
Encode
Decode
TX
TXIR
RX
RXIR
RESET
MCP2122
PICmicro
®
SO
SI
TFDU 4100
UART
TXD
RXD
Reset
Logic
Clock
Logic
16XCLK
Clock
Host UART
Interface
IR
Interface
Host Controller Protocol Handler Optical
Transceiver
(I/O)
MCU
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