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FDC2212QDNTRQ1 Datasheet(PDF) 11 Page - Texas Instruments |
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FDC2212QDNTRQ1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 58 page IN0A IN0B IN3A IN3B FDC2114 / FDC2214 VDD GND SCL SDA Int. Osc. ADDR INTB SD GND MCU VDD 3.3 V 3.3 V GPIO GPIO 0.1 F 1 F Core I 2C I 2C peripheral 3.3 V L Cap Sensor 0 CLKIN 40 MHz C L Cap Sensor 3 C Resonant circuit driver Resonant circuit driver Copyright © 2016, Texas Instruments Incorporated 11 FDC2112-Q1, FDC2114-Q1, FDC2212-Q1, FDC2214-Q1 www.ti.com SNOSCZ9 – MAY 2016 Product Folder Links: FDC2112-Q1 FDC2114-Q1 FDC2212-Q1 FDC2214-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Functional Block Diagrams (continued) Figure 11. Block Diagram for the FDC2114 and FDC2214 The FDC 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 FDC 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. 7.3 Feature Description 7.3.1 Clocking Architecture Figure 12 shows the clock dividers and multiplexers of the FDC. |
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