Datenblatt-Suchmaschine für elektronische Bauteile |
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FDC1004DSCJ Datenblatt(PDF) 10 Page - Texas Instruments |
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FDC1004DSCJ Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 33 page CAPACITANCE TO DIGITAL CONVERTER I 2C FDC1004 SDA SCL VDD GND OFFSET & GAIN CALIBRATION CONFIGURATION REGISTERS & DATA REGISTERS CAPDAC M U X EXCITATION M U X CIN1 CIN2 CIN3 CIN4 SHLD2 SHLD1 CHA CHB FDC1004 SNOSCY5B – AUGUST 2014 – REVISED APRIL 2015 www.ti.com 8 Detailed Description 8.1 Overview The FDC1004 is a high-resolution, 4-channel capacitance-to-digital converter for implementing capacitive sensing solutions. Each channel has a full scale range of ±15 pF and can handle a sensor offset capacitance of up to 100 pF, which can be either programmed internally or can be an external capacitor for tracking environmental changes over time and temperature. The large offset capacitance capability allows for the use of remote sensors. The FDC1004 also includes shield drivers for sensor shields, which can reduce EMI interference and help focus the sensing direction of a capacitive sensor. The small footprint of the FDC1004 allows for use in space-constrained applications. For more information on the basics of capacitive sensing and applications, refer to FDC1004: Basics of Capacitive Sensing and Applications application note (SNOA927). 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 The Shield The FDC1004 measures capacitance between CINn and ground. That means any capacitance to ground on signal path between the FDC1004 CINn pins and sensor is included in the FDC1004 conversion result. In some applications, the parasitic capacitance of the sensor connections can be larger than the capacitance of the sensor. If that parasitic capacitance is stable, it can be treated as a constant capacitive offset. However, the parasitic capacitance of the sensor connections can have significant variation due to environmental changes (such as mechanical movement, temperature shifts, humidity changes). These changes are seen as drift in the conversion result and may significantly compromise the system accuracy. To eliminate the CINn parasitic capacitance to ground, the FDC1004 SHLDx signals can be used for shielding the connection between the sensor and CINn. The SHLDx output is the same signal waveform as the excitation of the CINn pin; the SHLDx is driven to the same voltage potential as the CINn pin. Therefore, there is no current between CINn and SHLDx pins, and any capacitance between these pins does not affect the CINn charge transfer. Ideally, the CINn to SHLD capacitance does not have any contribution to the FDC1004 result. In differential measurements, SHLD1 is assigned to CHn and SHLD2 is assigned to CHm, where n < m. For instance in the measurement CIN1 – CIN2, where CHA = CIN1 and CHB = CIN2 (see Table 4), SHDL1 is assigned to CIN1 and SHDL2 is assigned to CIN2. 10 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated Product Folder Links: FDC1004 |
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