FX929B datasheet(4/48 Pages) CMLMICRO

4 / 48 page

4-Level FSK Modem Data Pump

FX929B

D/929B/1

1.3

Signal List

Package

P4/D2/D5

Signal

Description

Pin No.

Name

Type

IRQN

O/P

A 'wire-ORable' output for connection to the host

µC's Interrupt Request input. This output has a

low impedance pull down to VSS when active

and is high impedance when inactive.

)

8-bit bidirectional 3-state

µC interface data

)

lines.

)

RDN

I/P

Read. An active low logic level input used to

control the reading of data from the modem into

the host

µC.

WRN

I/P

Write. An active low logic level input used to

control the writing of data into the modem from

the host

µC.

Vss

Power

The negative supply rail (ground).

CSN

I/P

Chip Select. An active low logic level input to

the modem, used to enable a data read or write

operation.

I/P

)

Two logic level modem register select

I/P

)

inputs.

XTALN

O/P

The output of the on-chip oscillator.

XTAL/CLOCK

I/P

The input to the on-chip oscillator, for external

Xtal circuit or clock.

DOC 2

DOC 1

O/P

)

Connections to the Rx level measurement

)

circuitry. A capacitor should be connected

)

from each pin to VSS.

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