MCP2140_13 datasheet(6/58 Pages) MICROCHIP

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MCP2140

DS21790B-page 6

Preliminary

 2003-2012 Microchip Technology Inc.

RTS

TTL

Request to Send. Indicates that a Host Controller is ready to

receive data from the MCP2140. This signal is locally emu-

lated and not related to the CTS/RTS bit of the IrDA Primary

device.

= Host Controller not ready to receive data

= Host Controller ready to receive data

VDD

15, 16

—

Positive supply for logic and I/O pins.

OSC2

—

Oscillator crystal output.

OSC1/CLKIN

CMOS Oscillator crystal input/external clock source input.

Carrier Detect. The state of this bit is communicated to the

IrDA Primary device via the IrDA CD bit.

= No Carrier Present

= Carrier Present

RXPD

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 max-

imum requirements as specified in Parameter IR131A.

TABLE 1-2:

MCP2140 PIN DESCRIPTION NORMAL OPERATION (DCE) (CONTINUED)

Pin Name

Pin Number

Type

Buffer

Type

PDIP

SOIC

SSOP

Description

Legend:

TTL = TTL compatible input

ST = Schmitt Trigger input with CMOS levels



A = Analog

P = Power



CMOS = CMOS compatible input

OC = Open collector output



I = Input

O = Output

1: The state of the DTR output pin does not reflect the state of the DTR bit of the IrDA Primary Device.

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