MCP2140 データシートの表示（PDF） - Microchip Technology

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MCP2140

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

Microchip Technology 

MCP2140

TABLE 1-2: MCP2140 PIN DESCRIPTION NORMAL OPERATION (DCE) (CONTINUED)

Pin Name

Pin Number

Pin Buffer

PDIP SOIC SSOP Type Type

Description

RTS

13 13 14

I

VDD

14

OSC2

15

OSC1/CLKIN 16

CD

17

14 15, 16 —

15 17

O

16 18

I

17 19

I

RXPD

18 18 20

I

Legend:

TTL = TTL compatible input

A = Analog

CMOS = CMOS compatible input

I = Input

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.

1 = Host Controller not ready to receive data

0 = Host Controller ready to receive data

P Positive supply for logic and I/O pins.

— Oscillator crystal output.

CMOS Oscillator crystal input/external clock source input.

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

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 max-

imum requirements as specified in Parameter IR131A.

ST = Schmitt Trigger input with CMOS levels

P = Power

OC = Open collector output

O = Output

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

DS21790A-page 6

Preliminary

 2003 Microchip Technology Inc.

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