MCP2122-E/P Microchip Technology, MCP2122-E/P Datasheet - Page 7

• 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

2.4
The MCP2122 requires an external clock source to
operate. The 16XCLK pin is the device clock input (see
Figure
interface or the IR interface. The 16XCLK determines
all timing during device operation. It is the edge of the
16XCLK pin that causes activity to occur.
The 16XCLK signal can also be referred to as a bit
clock (BITCLK). There are 16 BITCLKs for each bit
time. The BITCLKs are used for the generation of the
Start bit, the eight data bits and the Stop bit.
When the embedded system could be receiving IR
communication, the MCP2122 is required to have the
16XCLK signal clocking at the expected frequency,
with minimal variation in that frequency. Between data
bytes (Stop bit to Start bit), the 16XCLK frequency can
be changed. This may occur in systems where the Host
Controller is implementing one of the IrDA standard
application layer protocols (such as IrObex).
FIGURE 2-6:
FIGURE 2-7:
© 2007 Microchip Technology Inc.
16XCLK
2-5) and is independent of the host UART
16XCLK
(output)
(output)
(input)
(input)
16XCLK (Bit Clock)
(input)
(input)
RXIR
TXIR
RX
TX
16XCLK AND RX/RXIR
16XCLK AND TX/TXIR
≤ 3 CLK
16 16XCLK
16 16XCLK
Bit A
Bit A
Preliminary
3 CLK (≤ ~ 4 µs)
16 16XCLK
16 16XCLK
When the embedded system does not want to receive
IR communications, the 16XCLK clock can be disabled
(static). This will reduce the power consumption of the
system.
Figure 2-6
to the RXIR input, which then determines the RX output
signal.
16XCLK signal to the TX input, which then determines
the TXIR output signal. For device timing information,
refer to Section 4.0 “Electrical Characteristics”.
FIGURE 2-5:
16XCLK
Figure 2-7
shows the relationship of the 16XCLK signal
16 16XCLK
16 16XCLK
Bit B
Bit B
shows the relationship of the
DEVICE CLOCK SOURCE
MCP2122
MCP2122
DS21894C-page 7