CMX641AD2 データシートの表示（PDF） - CML Microsystems Plc

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CMX641AD2

DUAL SPM/SECURITY DETECTOR/GENERATOR

CML Microsystems Plc 

Dual SPM/Security Detector/Generator

Package Package

D2

P4

Signal

Description

CMX641A

Pin No.

22

Pin No.

22

Name

SYSTEM

SELECT

TX TONE

SELECT

Type

I/P

I/P

This is a dual function pin differing between

Fixed Bandwidth Operating state and Enhanced

Features Operating state.

This pin has an internal pullup on chip so that

the default modes are Detect 12kHz (Fixed

Bandwidth Operating state, Fixed Sensitivity

mode) or TX Tone = 12kHz (Enhanced Features

Operating state).

(Fixed Bandwidth Operating state).

In the Fixed Sensitivity mode, this pin selects

the system frequency. High (logic ‘1’) = 12kHz;

Low (logic ‘0’) = 16kHz.

In the Controlled Sensitivity mode, this pin may

be tied to VDD or may be left unconnected.

Future functions of this pin, if tied low, are

reserved.

(Enhanced Features Operating state).

This pin selects 12kHz or 16kHz as the transmit

frequency at the TONE OP pin. When high

(logic ‘1’), the Tx tone at the TONE OP pin is

12kHz. When low (logic ‘0’), the Tx tone is

16kHz.

23

23

TONE OP

O/P

Operates in Enhanced Features Operating state

only. A 12kHz or 16kHz transmit tone appears

at this pin under the control of the TONE ASK

and the TX TONE SELECT pin.

In Fixed Bandwidth Operating state, this pin is

unused and should be left unconnected.

24

24

VDD

POWER The positive supply rail. Critical levels and

voltages within the CMX641A are dependent

upon this supply. This pin should be decoupled

to VSS by a capacitor mounted close to the

device pins.

Notes: I/P

O/P

BI

= Input

= Output

= Bidirectional

(Note also that SYSTEM SELECT/TX TONE SELECT,

ENHANCED FEATURES and PRESET LEVEL/TONE ASK

pins should never be simultaneously driven low - to VSS).

© 2002 Consumer Microcircuits Limited

7

D/641A/5

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