MCP2140DM-TMPSNS Microchip Technology, MCP2140DM-TMPSNS Datasheet - Page 25

• Manufacturer Part Number: MCP2140DM-TMPSNS
• Description: BOARD DEMO FOR MCP2140
• Manufacturer: Microchip Technology

Specifications of MCP2140DM-TMPSNS

• Main Purpose: Interface, IrDA
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP2140
• Primary Attributes: IrDA Controller with PIC18F MCU and Temp Sensor Temp
• Secondary Attributes: Set up as a Data Logger
• Processor To Be Evaluated: MCP2140
• Interface Type: ICSP
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP2140
• Kit Application Type: Sensing - Temperature
• Application Sub Type: Temperature Sensor
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP2140DM-TMPSNSR; MCP2140DM-TMPSNSR

 2004 Microchip Technology Inc.
The key signals for the MCP2140-to-IR transceiver circuit are shown in Table 2-2.
Further information on the IR transceiver interface may be obtained from the MCP2140
data sheet (DS21790).
TABLE 2-2:
In addition to the signals described in Tables 2-1 and 2-2, the PHACT (Protocol Handler
Active) output signal indicates which mode the MCP2140 IrDA standard protocol
controller state machine is in (0 = NDM or Low-power mode,1 = Discovery or NRM)
and is connected to the PHACT LED (D4); the RESET input is connected to the RESET
output of the Host Controller (I/O pin RA4), which asserts low after the RESET
push-button switch is asserted; the RI (Ring Indicator) input is pulled to ground; and the
OSC1 and OSC2 pins are connected to an external 7.3728 MHz oscillator, as specified
in the MCP2140 data sheet (allowing the device to transmit at 9600 baud).
2.5.2.1
The MCP2140 (U3) implements the 9-wire “cooked” service class in the IrCOMM
application layer protocol of the IrDA standard specification. IrCOMM is the IrDA
standard specification for the replacement of the communication ports (serial and
parallel) of a PC. The MCP2140 allows the replacement of the serial cable with a wire-
less interface. The MCP2140 implements the entire protocol layer, and the Host
Controller (PIC18F1320) “talks” to the MCP2140 as if it were a serial port with flow
control.
The MCP2140 operates as a Secondary device only, so it will not initiate IrDA standard
communication with other IrDA standard devices (neither a Secondary device nor a
Primary device).
Appendix C. “MCP2140 Connection Sequence Overview” shows the connection
sequence between a Primary device and the MCP2140 (Secondary device). This
connection sequence is shown at an overview level and does not show exact
operation.
RXPDREF
TXIR
RXPD
Legend: A = Analog
Pin Name
I = Input
MCP2140 OPERATION
Number
(SSOP)
Pin
20
MCP2140 IR INTERFACE PINS
1
2
Type
Pin
O
I
I
Buffer
Type
—
A
A
IR Receive Photo Detect Diode reference voltage.
This voltage will typically be in the range of V
Asynchronous transmit to IrDA
transceiver.
IR RX Photo Detect Diode input. This input signal is
required to be a pulse to indicate an IR bit. When
the amplitude of the signal crosses the amplitude
threshold set by the RXPDREF pin, the IR bit is
detected. The pulse has minimum and maximum
requirements as specified in the MCP2140 data
sheet, Electrical Characteristics table,
Parameter IR131A.
P = Power
O = Output
Description
®
standard
DS51487A-page 21
DD
/2.