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LDC1312QDNTTQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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LDC1312QDNTTQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 56 page IN0A IN0B VDD Core GND SCL SDA I 2C CLKIN ADDR INTB SD Resonant Circuit Driver IN1A IN1B Resonant Circuit Driver IN0A IN0B VDD GND SCL SDA I 2C CLKIN ADDR INTB SD Resonant Circuit Driver IN3A IN3B Resonant Circuit Driver fREF fIN Core fREF fIN 40 MHz 40 MHz Copyright © 2016, Texas Instruments Incorporated 10 LDC1312-Q1, LDC1314-Q1 SNOSCZ6 – APRIL 2016 www.ti.com Product Folder Links: LDC1312-Q1 LDC1314-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview Conductive objects brought in contact with an AC electromagnetic (EM) field will induce field changes that can be detected using a sensor such as an inductor. Conveniently, an inductor, along with a capacitor, can be used to construct an L-C resonator, also known as an L-C tank, which can be used to produce an EM field. In the case of an L-C tank, the effect of the field disturbance is an apparent shift in the inductance of the sensor, which can be observed as a shift in the resonant frequency. Using this principle, the LDC1312/1314 is an inductance-to-digital converter (LDC) that measures the oscillation frequency of an LC resonator. The device outputs a digital value that is proportional to frequency. This frequency measurement can be converted to an equivalent inductance. 8.2 Functional Block Diagram Figure 10. Block Diagrams for the LDC1312 (Left) and LDC1314 (Right) The LDC1312/LDC1314 is composed of front-end resonant circuit drivers, followed by a multiplexer that sequences through the active channels, connecting them to the core that measures and digitizes the sensor frequency (fSENSOR). The core uses a reference frequency (fREF) to measure the sensor frequency. fREF is derived from either an internal reference clock (oscillator), or an externally supplied clock. The digitized output for each channel is proportional to the ratio of fSENSOR/fREF. The I2C interface is used to support device configuration and to transmit the digitized frequency values to a host processor. The LDC can be placed in shutdown mode, saving current, using the SD pin. The INTB pin may be configured to notify the host of changes in system status. 8.3 Feature Description 8.3.1 Clocking Architecture Figure 11 shows the clock dividers and multiplexers of the LDC. |
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