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AN3271 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN3271 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 29 page 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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