MCP2140AT-ISLASHSS datasheet(5/60 Pages) MICROCHIP

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DS22050A-page 5

MCP2140A

TABLE 1-1:

MCP2140A PIN DESCRIPTION NORMAL OPERATION (DCE)

Pin Name

Pin Number

Type

Buffer

Type

PDIP

SOIC

SSOP

Description

RXPDREF

IR Receive Photo Detect Diode reference voltage. This

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

TXIR

—

Asynchronous transmit to IrDA transceiver.

PHACT

—

Protocol Handler Active. Indicates the state of the

MCP2140A Protocol Handler. This output is an open

collector, so an external pull-up resistor may be required.

= Protocol Handler is in the Discovery or NRM state

= Protocol Handler is in NDM state or the MCP2140A is in

Low Power mode

RESET

Resets the Device

VSS

5, 6

—

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.

= No Ring Indicate Present

= Ring Indicate Present

DSR

—

Data Set Ready. Indicates that the MCP2140A 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.

= An IR link has not been established

(No IR Link)

= An IR link has been established (IR Link)

DTR

TTL

Data Terminal Ready. Indicates that the Embedded device

connected to the MCP2140A 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.

= Embedded device not ready

= Embedded device ready

CTS

—

Clear to Send. Indicates that the MCP2140A 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.

= Host Controller should not send data

= Host Controller may send data

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

Note 1:

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

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