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ELM412SM Datasheet(PDF) 4 Page - ELM Electronics |
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ELM412SM Datasheet(HTML) 4 Page - ELM Electronics |
4 / 4 page Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Example Application ELM412 Output Waveforms 4 of 4 ELM412DSB 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 2.2K Ω 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. Control Bit from the Microprocessor (1=on, 0=off) 0.01µF +5V 1 2 3 4 8 7 6 5 Piezo Element 2.2K Ω Figure 3. Out1 Enable Out2 Out1 - Out2 The output waveforms are generated as long as the enable input remains high. When brought low, the current cycle completes before the output ceases. Figure 2. |
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