MCP2122-E/P Microchip Technology, MCP2122-E/P Datasheet - Page 10

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

Specifications of MCP2122-E/P

• 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)
• Ic Function: Encoder / Decoder IC
• Supply Voltage Range: 1.8V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: DIP
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): Yes
• Leaded Process Compatible: Yes
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP212XDM - BOARD DEVELOPMENT IRDA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP2120/22 Developer’s Board User’s Guide
1.3
DS51842A-page 6
MCP2120/22 DEVELOPER’S BOARD FEATURES
The MCP2120/22 Developer’s Board has five functional blocks. These are:
• Power
• Host Microcontroller
• MCP212X Device (MCP2120 or MCP2122)
• Optical Transceiver circuitry
• RS-232 circuitry/interface
The MCP2120/22 Developer’s Board power can come from either the USB connection
or the power test points. The USB power is regulated to 3.3V, due to requirements from
the PIC18F65J50. To allow the other circuitry to operate at higher voltages, the
MCP2120/22 Developer’s Board has two power planes. One for the PIC18F65J50
circuitry and the other for the MCP2120/22/Optical Transceiver/RS-232 Driver circuitry.
An LED is used to indicate when power is applied to the MCP2120/22/Optical
Transceiver/RS-232 Driver circuitry. A jumper (JP2) is used to tie the two power planes
together.
The Host Microcontroller (PIC18F65J50) can be used to drive the MCP2120/22 clock.
That is what the default firmware does for both demo programs. This clock can be
disconnected from the MCP2120/22, and a standard crystal can be used. The Host
Controller can be programmed via the ICSP interface with user developed programs.
The MCP2120/22DM has the MCP2122 device is mounted in a DIP socket. An SOIC
footprint is supplied if testing with an SOIC device is desired.
The board supports up to four optical transceivers circuit implementations. Two
implementations share the same general circuit layout. Only one optical transceiver
circuit is installed at the time of manufacture. The others are for user implementation
and evaluation. Jumpers are used to select the optical transceiver that is used by the
system.
A MAX3238 compatible level-shifting IC with all the necessary hardware to support
connection of a RS-232 host through the DB-9 connector. The port can be connected
to a PC using a straight through cable. Refer to the MCP2122 Data Sheet (DS21894)
or MCP2120 Data Sheet (DS21618) for more information on the Host Interface
signals.
The PIC18F65J50 has a maximum operational voltage of 3.6V. If the MCP2120/22
Developer’s Board is powered by the V
to ensure that the PIC18F65J50 is not over voltaged. The PIC18F65J50 can be isolated
from the MCP2120/22’s power plane by removing the jumper shunt on jumpers JP1 and
JP2.
CAUTION
DD
and GND Test Points, then care must be taken
© 2009 Microchip Technology Inc.