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AN3271 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3271
Description  This application note provides
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3271 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3271
2/29
Doc ID 17933 Rev 2
Contents
1
Basic functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
Safe power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2
Interrupt assertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3
Power-down after long push (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4
Reset after long push (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin descriptions and typical application hookup . . . . . . . . . . . . . . . . . . 7
3
Timing accuracy note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
STM660x advantages over alternative solutions . . . . . . . . . . . . . . . . . 10
4.1
Using a microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2
Discrete solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Push-button input glitch immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Various connections of push-buttons . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1
Single button control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2
Alternative single button control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3
Multiple button control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7
Low battery detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Automatic confirmation of power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9
Automatic confirmation of power-up + immediate shutdown after
PB button press or undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10
Automatic confirmation of power-up + immediate shutdown after
PB button press only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11
VCC transient protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12
High voltage connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22


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