ELM412 Просмотр технического описания (PDF) - Elm Electronics

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ELM412

Piezo Element Driver

Elm Electronics 

Output Waveforms

The output waveforms are generated as long as

the enable input remains high. When brought low,

the current cycle completes before the output

ceases.

Enable

Out1

Out2

Out1 - Out2

ELM412

Figure 2.

Example Application

Operation of the ELM412 is straightforward,

requiring little explanation. Typically the resonant

frequency of the piezo element is determined, and

pins 2, 3 and 4 are connected for this frequency. In

the circuit of Figure 3, the frequency has been set for

2400Hz. A single bit from a control circuit is then

used to turn the buzzer on and off.

The 2.2KΩ resistor shown in the circuit serves

two purposes. One is to provide a current limit for the

ELM412 as it tries to rapidly change the piezo

voltage (the piezo is like a large capacitor), and the

other is to simply limit the output loudness.

The only other detail in Figure 3 is the customary

0.01µF capacitor for supply decoupling. It’s always

good practice to add one, although it’s often not

essential.

0.01µF

+5V

1

8

2

7

3

6

4

5

Control Bit from the

Microprocessor

(1=on, 0=off)

Figure 3.

2.2KΩ

Piezo

Element

ELM412DSB

Elm Electronics – Circuits for the Hobbyist

< http://www.elmelectronics.com/ >

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