M-993 Просмотр технического описания (PDF) - Clare Inc => IXYS

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производитель

M-993

Region 1 MF Tone Generator

Clare Inc => IXYS 

Pin Function

Pin

CE

D0 - D3

D4-D5

MUTE

OUTDRIVE

VDD

VREF

VSS

XIN

XOUT

Function

Latches data and enables output (active low

input).

Data input pins. (See Data/Tone Selection.)

Leave open.

Output indicates that a signal is being

generated at OUTDRIVE.

Linear buffered tone output.

Most positive power supply input pin.

Internally generated mid-power supply

voltage (output).

Most negative power supply input pin.

Crystal oscillator or digital clock input.

Crystal oscillator output.

Power-On Reset Circuit

M-993

Data/Tone Selection

D3 D2 D1 D0 Frequency (Hz)

1

2

0 0 0 0 1100

1700

0 0 0 1 700

900

0 0 1 0 700

1100

0 0 1 1 900

1100

0 1 0 0 700

1300

0 1 0 1 900

1300

0 1 1 0 1100

1300

0 1 1 1 700

1500

1 0 0 0 900

1500

1 0 0 1 1100

1500

1 0 1 0 1300

1500

1 0 1 1 1500

1700

1 1 0 0 900

1700

1 1 0 1 1300

1700

1 1 1 0 700

1700

Use

Key Pulse (KP)

Digit 1

Digit 2

Digit 3

Digit 4

Digit 5

Digit 6

Digit 7

Digit 8

Digit 9

Digit 0

ST

ST1

ST2

ST3

A typical control sequence for the M-993 is: (1) set

data lines Selection for data settings for a particular

tone pair output).to desired frequency selection, (2)

wait for data lines to settle, (3) drive the chip enable

(CE) low, (4) maintain CE low for desired tone duration

(Note: data lines may be changed after data hold

time), and (5) return CE to a logic high.

In a bus-oriented system, noise on the data lines may

propagate through the device and appear at the out-

put. To safeguard against this, use an external latch to

clock the data into the device. In addition, it is good

practice to bypass the VREF pin to ground with a small

capacitor (~0.01mF) to reduce power supply noise.

The designer should be aware of device timing

requirements and design accordingly. Beware of hard-

wiring the data input pins for dedicated tone genera-

tion. An RC network like that shown in Power-On

Reset Circuit should be used to momentarily reset the

device immediately following a power-up to ensure

reliable operation.

Rev. 1

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