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AN609

更新时间： 2022-11-25 11:11:30

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美信 - MAXIM		开关按钮开关
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Tiny IC Debounces Pushbutton Switch

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AN609 数据手册

SUPERVISORY/VOLTAGE MONITOR CIRCUITS

Application Note 609: Jun 01, 2001

Tiny IC Debounces Pushbutton Switch

When a push-button is used to manually reset a µP, ringing from the switch may cause

a false reset output signal when the switch is press and de-pressed. Maxim's

microprocessor supervisors have a debounced manual reset input to help ignore this

ringing.

Though they're not complicated, schemes for debouncing a pushbutton switch usually entail

using several logic gates. It's easy to include such circuits in an ASIC. Adding a debouncer as a

last-minute design change, however, can be inconvenient. In such cases, the circuit in the figure

below can come in handy. The circuit, using only a 4-pin SO-package IC, squares up and

debounces a pushbutton signal. IC₁is a reset chip with a reset output that goes high when its

supply voltage drops below 2.65V or when its manual-reset input (MR-bar) goes low. MR-bar

usually connects to a system-reset input, and reset connects to a µC, but the connections shown

enable the device to debounce any signal.

The internal one-shot provides an instant response to the first falling edge on the input and then

delays any further response until 140msec after the last rising edge. The MAX812 shown

inverts the pushbutton input; a similar device (MAX811) is noninverting. The ICs also

incorporate a power-on reset function that asserts the reset output when V_CCfalls below a

preset threshold and also asserts the output for 140msec after each application of power.

Selecting an R-suffix part sets this threshold at its lowest value (2.63V), preventing false

outputs in the debouncer except when the supply voltage fails.

www.maxim-ic.com/an609

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