MCP2122-E/SN Microchip Technology, MCP2122-E/SN Datasheet - Page 22

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

Specifications of MCP2122-E/SN

• Package / Case: 8-SOIC (3.9mm Width)
• 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: Surface Mount
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• 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: SOIC
• No. Of Pins: 8
• 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
• Other names: MCP2122-E/SNG; MCP2122-E/SNG

MCP2120/22 Developer’s Board User’s Guide
TABLE 2-3:
DS51842A-page 18
Legend:X = Undefined (either "1" or "0").
X X
0
1
7 3
MODE
1
0
1
0
1 1 1
1 1 0 Pass Data Through (UART1 <---> UART2)
1 0 1 Pass Data Through (UART1 --> UART2) with UART2
1 0 0 Echo Data Received and change case (A --> a, a --> A)
0 1 1 Stream a Data Table
0 1 0 RESERVED
0 0 1 RESERVED
0 0 0 RESERVED
6:4
Program
Generate Clock only (determined by RD0:RD2)
No Clock Generation
Generate Clock only (determined by RD0:RD2)
Generate Clock only (@ 3.6864 MHz)
fixed at 115,200 Baud
MCP212XDM FIRMWARE PROGRAM SELECTION
2.2.1.1
The PIC firmware reads the state of the RD7 and RD3 signals. If the signals indicate
that the device is the MCP2120 and to use the PIC as the clock source, then the PIC
will source a frequency that is determined by the RD2:0 signals.
The PIC firmware reads the state of the RD3 signal to determine if the encoder/decoder
device is an MCP2120 or MCP2122.
If the device is the MCP2120, then the PWM output frequency is set to 3.6864 MHz and
the PIC drives the MCP2120’s BAUD2:0 signals with the selected baud rate from the
state of the RD2:0 signals.
If the device is the MCP2122, then the PWM output frequency is determined from the
state of the RD2:0 signals.
This mode requires that the MCP2122’s TX and RX signals are directly connected to
the MAX3238 compatible device.
2.2.1.2
The PIC firmware reads the state of the RD7 and RD3 signals. If the signals indicate
that the device is the MCP2120 and to use the PIC as the clock source, then the PIC
will source a 3.6864 MHz clock to be used by the MCP2120 device. The PIC will drive
the MCP2120’s BAUD2:0 signals with the selected baud rate from the state of the
RD2:0 signals.
Although the clock could drive the MCP2122’s 16XCLK pin, the frequency is higher
than the maximum specification.
This mode requires that the MCP2120’s TX and RX signals are directly connected to
the MAX3238 compatible device.
RD0:RD2)
FIRMWARE OPERATION - Generate Clock only (determined by
FIRMWARE OPERATION - Generate Clock only (@ 3.6864 MHz)
Comment
MCP2122 uses PIC 16XCLK
MCP2120 uses Crystal
MCP2122 uses PIC 16XCLK
MCP212x uses PIC Clock
See Appendix E.
© 2009 Microchip Technology Inc.