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AT42QT1110-AU Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT42QT1110-AU Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 50 page  9 AT42QT1110-MU / AT42QT1110-AU [DATASHEET] 9520J–AT42–05/2013 3.5 Power Supply 3.5.1 General Considerations See Section 8.2 on page 38 for the power supply range. If the power supply fluctuates slowly with temperature, the device tracks and compensates for these changes automatically with only minor changes in sensitivity. If the supply voltage drifts or shifts quickly, the drift compensation mechanism is not able to keep up, causing sensitivity anomalies or false detections. The usual power supply considerations with QT parts apply to the device. The power should be clean and come from a separate regulator if possible. However, this device is designed to minimize the effects of unstable power, and, except in extreme conditions, should not require a separate Low Dropout (LDO) regulator. See underneath Figure 1.3 on page 4 for suggested regulator manufacturers. It is assumed that a larger bypass capacitor (like1 µF) is somewhere else in the power circuit; for example, near the regulator. 3.5.2 Brownout Detection The QT1110 includes a power supply monitoring circuit that detects if Vdd drops below a safe operating voltage. When this occurs, the device goes into a Reset state, where no acquisition or processing is carried out. The device remains in this state until Vdd returns to the specified voltage range. Once a safe operating voltage is detected, the QT1110 behaves as per normal power-on/reset conditions; that is, any saved settings are restored from EEPROM, the internal self-tests are run and all channels are calibrated. The Brown-out detector threshold is 2.7 V ±10%. 3.6 QFN Package Restrictions The central pad on the underside of the QFN chip should be connected to ground. Do not run any tracks underneath the body of the chip, only ground. Figure 3-1 shows examples of good and bad tracking. Figure 3-1. Examples of Good and Bad Tracking Caution: A regulator IC shared with other logic can result in erratic operation and is not advised. A single ceramic 0.1 µF bypass capacitor, with short traces, should be placed very close to the power pins of the IC. Failure to do so can result in device oscillation, high current consumption, or erratic operation. Example of GOOD tracking Example of BAD tracking |
Similar Part No. - AT42QT1110-AU_14 |
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Similar Description - AT42QT1110-AU_14 |
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