June 2012

Doc ID 17933 Rev 2

1/29

AN3271

Application note

Using the STM6600, STM6601 smart push-button on/off controller

By Ales Sura

Introduction

This application note provides a detailed description of the primary applications and benefits

of the STM6600-STM6601. These devices allow easy and safe control of applications run

with one or two push-buttons by securely starting or powering down a system and also

resetting the processor or disabling power in case of a non-responding application (e.g.

code in a dead loop). This makes the STM660x devices suitable for a broad spectrum of

applications such as terminals, audio and video players, smartphones, PDAs, PCs, or any

portable device.

A smart on/off controller monitors the state of the connected push-button(s) as well as

ensures sufficient supply voltage. An enable output controls the power for the application

through a MOSFET transistor, DC-DC converter, regulator, etc. (see Figure 1).

The device also offers additional features such as a precise 1.5 V voltage reference with

very tight accuracy of ±1%, which can be used as a reference for A/D and D/A conversion.

The current consumption is a very low 6 µA during normal operation and only 0.6 µA current

during standby.

The STM660x is available in the tiny TDFN12 package and is offered with several optional

features such as selectable threshold, hysteresis, timeouts, output types, etc. (see

datasheet for available part options).

Figure 1.

Simplified hookup

www.st.com