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)

Pin Name

Pin Number

Pin Buffer

PDIP SOIC SSOP Type Type

Description

RXPDREF

1

1

1

I

TXIR

PHACT

2

2

2

O

3

3

3

OC

RESET

VSS

NC

TX

RX

RI

4

4

4

I

5

5 5, 6 —

6

6

7

I

7

7

8

I

8

8

9

O

9

9

10

I

DSR

10 10

11

O

DTR

11

11

12

I

CTS

12 12 13

O

Legend:

TTL = TTL compatible input

A = Analog

CMOS = CMOS compatible input

I = Input

A IR Receive Photo Detect Diode reference voltage. This

voltage will typically be in the range of VDD/2.

— Asynchronous transmit to IrDA transceiver.

— Protocol Handler Active. Indicates the state of the MCP2140

Protocol Handler. This output is an open collector, so an

external pull-up resistor may be required.

1 = Protocol Handler is in the Discovery or NRM state

0 = Protocol Handler is in NDM state or the MCP2140 is

in Low Power mode

ST Resets the Device

P Ground reference for logic and I/O pins

— No connect

TTL Asynchronous receive; from Host Controller UART

— Asynchronous transmit; to Host Controller UART

TTL Ring Indicator. The state of this bit is communicated to the

IrDA Primary Device.

1 = No Ring Indicate Present

0 = Ring Indicate Present

— Data Set Ready. Indicates that the MCP2140 has estab-

lished a valid IrDA link with a Primary Device(1). This signal

is locally emulated and not related to the DTR bit of the IrDA

Primary Device.

1 = An IR link has not been established

(No IR Link)

0 = An IR link has been established (IR Link)

TTL Data Terminal Ready. Indicates that the Embedded device

connected to the MCP2140 is ready for IR data. The state of

this bit is communicated to the IrDA Primary Device via the

IrDA DSR bit carried by IrCOMM.

1 = Embedded device not ready

0 = Embedded device ready

— Clear to Send. Indicates that the MCP2140 is ready to

receive data from the Host Controller. This signal is locally

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

Primary Device.

1 = Host Controller should not send data

0 = Host Controller may send data

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.

 2003 Microchip Technology Inc.

Preliminary

DS21790A-page 5

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