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MCP215X/40 Developer’s Daughter Board User’s Guide
TABLE 2-10:
MCP2140 IR INTERFACE PINS
Pin Name
RXPDREF
Pin
Number
(SSOP)
1
Pin
Type
I
Buffer
Type
A
Description
IR Receive Photo Detect Diode reference voltage.
This voltage will typically be in the range of V DD /2.
TXIR
2
O
—
Asynchronous transmit to IrDA ? standard
transceiver.
RXPD
20
I
A
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.
Legend: A = Analog
I = Input
P = Power
O = Output
2.5.2.2.1
Additional MCP215X Interface Signals
In addition to the signals described in Table 2-9 and Table 2-10, there are two additional
signals that can be used by the Host Controller. These are:
1. The RESET signal.
2. The PHACT (Protocol Handler Active) signal.
The MCP2140 RESET pin is connected to an I/O pin of the Host Controller. The H1/H3
headers each have the RESET signal connected to two pins, RA5 and RC3. The Host
Controller determines when the MCP215X device needs to be reset.
The MCP2140 PHACT (Protocol Handler Active) output signal indicates the current
mode the MCP2140 IrDA ? standard protocol controller state machine is in ( 0 = NDM
or Low-power mode ,1 = Discovery or NRM). An LED (D4) can be jumpered to the
MCP2140’s PHACT pin. This is done with jumper JMP3. The PHACT signal is not
connected to the H1/H3 headers.
DS51591A-page 28
? 2006 Microchip Technology Inc.
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