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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
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