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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2140 Datasheet

Standard Protocol Stack Controller

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MCP2140 pdf
M
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MCP2140
IrDA® Standard Protocol Stack Controller
With Fixed 9600 Baud Communication Rate
Features
• 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)
CMOS Technology
• Low power, high-speed CMOS technology
• Fully static design
• Low voltage operation
• Industrial temperature range
• Low power consumption
- < 1 mA @ 3.0V, 7.3728 MHz (typical)
Package Types
PDIP, SOIC
RXPDREF
TXIR
PHACT
RESET
VSS
NC
TX
RX
RI
SSOP
RXPDREF
TXIR
PHACT
RESET
VSS
VSS
NC
TX
RX
RI
1 18
2 17
3 16
4 15
5 14
6 13
7 12
8 11
9 10
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
RXPD
CD
OSC1/CLKI
OSC2
VDD
RTS
CTS
DTR
DSR
RXPD
CD
OSC1/CLKI
OSC2
VDD
VDD
RTS
CTS
DTR
DSR
Block Diagram
MCP2140
TX
Encode and
Protocol Handler
PHACT
Logic
Baud
Rate
Generator
RX
RTS
CTS
DSR
DTR
CD
RI
Protocol
Handler
and Decode
UART
Control
+
-
TXIR
RXPD
RXPDREF
OSC1
OSC2
2003 Microchip Technology Inc.
Preliminary
DS21790A-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2140 Datasheet

Standard Protocol Stack Controller

No Preview Available !

MCP2140 pdf
MCP2140
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MCP2140 System Block Diagram
PICmicro®
Microcontroller
SO
TX
MCP2140
Decode
TXIR
IR LED
SI
I/O
I/O
I/O
I/O
RTS
CTS
DSR
DTR
I/O
I/O
CD
RI
Baud Rate
Generator
RX
Encode
UART
Control
+
-
RXPD
IR Receive
Detect
RXPDREF Circuitry
IR Photo
diode
I/O PHACT
Logic
Note 1: Not all microcontroller I/O pins are required to be connected to the MCP2140.
DS21790A-page 2
Preliminary
2003 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2140 Datasheet

Standard Protocol Stack Controller

No Preview Available !

MCP2140 pdf
1.0 DEVICE OVERVIEW
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 appro-
priate data bytes to the Host Controller in UART-
formatted serial data.
The MCP2140 supports “point-to-point” applications,
that is, one Primary device and one Secondary device.
The MCP2140 operates as a Secondary device and
does not support “multi-point” applications.
Sending data using IR light requires some hardware
and the use of specialized communication protocols.
These protocol and hardware requirements are
described, in detail, by the IrDA standard specifications.
The encoding/decoding functionality of the MCP2140 is
designed to be compatible with the physical layer com-
ponent of the IrDA standard. This part of the standard is
often referred to as “IrPHY”.
The complete IrDA standard specification is available
for download from the IrDA website at www.IrDA.org.
MCP2140
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1.1 Applications
The MCP2140 Infrared Communications Controller,
supporting the IrDA standard, provides embedded sys-
tem designers the easiest way to implement IrDA stan-
dard wireless connectivity. Figure 1-1 shows a typical
application block diagram, while Table 1-2 shows the
pin definitions.
TABLE 1-1: OVERVIEW OF FEATURES
Features
MCP2140
Serial Communications UART, IR
Baud Rate Selection
Fixed
Low Power Mode
Yes
Resets (and Delays)
RESET, POR
(PWRT and OST)
Packages
18-pin DIP, SOIC,
20-pin SSOP
Infrared communication is a wireless, two-way data
connection using infrared light generated by low-cost
transceiver signaling technology. This provides reliable
communication between two devices.
Infrared technology offers:
• Universal standard for connecting portable
computing devices
• Easy, effortless implementation
• Economical alternative to other connectivity
solutions
• Reliable, high-speed connections
• Safe to use in any environment (can even be
used during air travel)
• Eliminates the hassle of cables
• Allows PCs and other electronic devices (such as
PDAs, cell phones, etc.) to communicate with
each other
• Enhances mobility by allowing users to easily
connect
The MCP2140 allows the easy addition of IrDA stan-
dard wireless connectivity to any embedded applica-
tion that uses serial data. Figure 1-1 shows typical
implementation of the MCP2140 in an embedded
system.
The IrDA protocol for printer support is not included in
the IrCOMM 9-wire “cooked” service class.
2003 Microchip Technology Inc.
Preliminary
DS21790A-page 3




Part Number MCP2140
Description Standard Protocol Stack Controller
Maker Microchip Technology
Total Page 30 Pages
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