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AD7152 Scheda tecnica(PDF) 22 Page - Analog Devices |
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AD7152 Scheda tecnica(HTML) 22 Page - Analog Devices |
22 / 24 page AD7152/AD7153 Data Sheet Rev. A | Page 22 of 24 The offset register of the AD7152/AD7153 allows for offset calibration over the full capacitive input range. However, the user must ensure that the offset to be removed is within 40% of the full scale range; this can be achieved by using the CAPCAC to perform a coarse offset calibration and use the system offset calibration then to compensate for an offset within the 40% of full-scale range pF of the CAPDAC. The offset calibration register is reloaded by the default value 0x8000 at power-on or after reset. Therefore, if the offset calibration is not repeated after each system power-up, the calibration coefficient value should be stored by the host controller and reloaded as part of the AD7152/AD7153 setup. Note that the AD7152/AD7153 zero scale for differential mode is around 0x8000; therefore, the offset register also needs a value of around 0x8000, where the zero scale in single-ended mode is 0x0000, with a required offset register value of 0x3000. For more detailed information, see the Data Registers section. TYPICAL APPLICATION DIAGRAM SCL VDD GND AD7153 SDA 3.3V VSUPPLY 1kΩ 1kΩ 1kΩ 0.1µF 10µF 1µF 1µF CIN1(+) CSENS1 CSENS2 CIN1(–) EXC1 C1 R1 C2 R2 C3 R3 C4 R4 47pF 10kΩ ADP1720-3.3 HOST SYSTEM GND Figure 41. Basic Application Diagram for a Differential Capacitive Sensor |
Codice articolo simile - AD7152_17 |
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Descrizione simile - AD7152_17 |
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