MCP2140A データシートの表示（PDF） - Microchip Technology

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MCP2140A

IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

Microchip Technology 

MCP2140A

TABLE 1-1: MCP2140A PIN DESCRIPTION NORMAL OPERATION (DCE) (CONTINUED)

Pin Name

Pin Number

Pin

PDIP SOIC SSOP Type

Buffer

Type

Description

RTS

13 13 14

I

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

receive data from the MCP2140A. This signal is locally

emulated and not related to the CTS/RTS bit of the IrDA

Primary device.

1 = Host Controller not ready to receive data

0 = Host Controller ready to receive data

VDD

14 14 15, 16 —

P Positive supply for logic and I/O pins.

OSC2

15 15 17

O

— Oscillator crystal output.

OSC1/CLKIN 16 16 18

I CMOS Oscillator crystal input/external clock source input.

CD

17 17 19

I

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

IrDA Primary device via the IrDA CD bit.

1 = No Carrier Present

0 = Carrier Present

RXPD

18 18 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.

Legend:

TTL = TTL compatible input

A = Analog

CMOS = CMOS compatible input

I = Input

ST = Schmitt Trigger input with CMOS levels

P = Power

OC = Open collector output

O = Output

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

DS22050A-page 6

© 2007 Microchip Technology Inc.

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