SNOSCZ5A June 2015  – June 2015 FDC2112 , FDC2114 , FDC2212 , FDC2214

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description, continued
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1Absolute Maximum Ratings
    2. 8.2ESD Ratings
    3. 8.3Recommended Operating Conditions
    4. 8.4Thermal Information
    5. 8.5Electrical Characteristics
    6. 8.6Timing Requirements
    7. 8.7Switching Characteristics - I2C
    8. 8.8Typical Characteristics
  9. Detailed Description
    1. 9.1Overview
    2. 9.2Functional Block Diagrams
    3. 9.3Feature Description
      1. 9.3.1Clocking Architecture
      2. 9.3.2Multi-Channel and Single-Channel Operation
        1. 9.3.2.1Gain and Offset (FDC2112, FDC2114 only)
      3. 9.3.3Current Drive Control Registers
      4. 9.3.4Device Status Registers
      5. 9.3.5Input Deglitch Filter
    4. 9.4Device Functional Modes
      1. 9.4.1Start-up Mode
      2. 9.4.2Normal (Conversion) Mode
      3. 9.4.3Sleep Mode
      4. 9.4.4Shutdown Mode
        1. 9.4.4.1Reset
    5. 9.5Programming
      1. 9.5.1I2C Interface Specifications
    6. 9.6Register Maps
      1. 9.6.1 Register List
      2. 9.6.2 Address 0x00, DATA_CH0
      3. 9.6.3 Address 0x01, DATA_LSB_CH0 (FDC2212 / FDC2214 only)
      4. 9.6.4 Address 0x02, DATA_CH1
      5. 9.6.5 Address 0x03, DATA_LSB_CH1 (FDC2212 / FDC2214 only)
      6. 9.6.6 Address 0x04, DATA_CH2 (FDC2114, FDC2214 only)
      7. 9.6.7 Address 0x05, DATA_LSB_CH2 (FDC2214 only)
      8. 9.6.8 Address 0x06, DATA_CH3 (FDC2114, FDC2214 only)
      9. 9.6.9 Address 0x07, DATA_LSB_CH3 (FDC2214 only)
      10. 9.6.10Address 0x08, RCOUNT_CH0
      11. 9.6.11Address 0x09, RCOUNT_CH1
      12. 9.6.12Address 0x0A, RCOUNT_CH2 (FDC2114, FDC2214 only)
      13. 9.6.13Address 0x0B, RCOUNT_CH3 (FDC2114, FDC2214 only)
      14. 9.6.14Address 0x0C, OFFSET_CH0 (FDC21112 / FDC2114 only)
      15. 9.6.15Address 0x0D, OFFSET_CH1 (FDC21112 / FDC2114 only)
      16. 9.6.16Address 0x0E, OFFSET_CH2 (FDC2114 only)
      17. 9.6.17Address 0x0F, OFFSET_CH3 (FDC2114 only)
      18. 9.6.18Address 0x10, SETTLECOUNT_CH0
      19. 9.6.19Address 0x11, SETTLECOUNT_CH1
      20. 9.6.20Address 0x12, SETTLECOUNT_CH2 (FDC2114, FDC2214 only)
      21. 9.6.21Address 0x13, SETTLECOUNT_CH3 (FDC2114, FDC2214 only)
      22. 9.6.22Address 0x14, CLOCK_DIVIDERS_CH0
      23. 9.6.23Address 0x15, CLOCK_DIVIDERS_CH1
      24. 9.6.24Address 0x16, CLOCK_DIVIDERS_CH2 (FDC2114, FDC2214 only)
      25. 9.6.25Address 0x17, CLOCK_DIVIDERS_CH3 (FDC2114, FDC2214 only)
      26. 9.6.26Address 0x18, STATUS
      27. 9.6.27Address 0x19, ERROR_CONFIG
      28. 9.6.28Address 0x1A, CONFIG
      29. 9.6.29Address 0x1B, MUX_CONFIG
      30. 9.6.30Address 0x1C, RESET_DEV
      31. 9.6.31Address 0x1E, DRIVE_CURRENT_CH0
      32. 9.6.32Address 0x1F, DRIVE_CURRENT_CH1
      33. 9.6.33Address 0x20, DRIVE_CURRENT_CH2 (FDC2114 / FDC2214 only)
      34. 9.6.34Address 0x21, DRIVE_CURRENT_CH3 (FDC2114 / FDC2214 only)
      35. 9.6.35Address 0x7E, MANUFACTURER_ID
      36. 9.6.36Address 0x7F, DEVICE_ID
  10. 10Application and Implementation
    1. 10.1Application Information
      1. 10.1.1Sensor Configuration
      2. 10.1.2Shield
    2. 10.2Typical Application
      1. 10.2.1Schematic
      2. 10.2.2Design Requirements
      3. 10.2.3Detailed Design Procedure
        1. 10.2.3.1Application Performance Plot
        2. 10.2.3.2Recommended Initial Register Configuration Values
        3. 10.2.3.3Inductor Self-Resonant Frequency
      4. 10.2.4Application Curves
      5. 10.2.5Power-Cycled Applications
    3. 10.3Do's and Don'ts
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1Layout Guidelines
    2. 12.2Layout Example
  13. 13Device and Documentation Support
    1. 13.1Device Support
      1. 13.1.1Third-Party Products Disclaimer
    2. 13.2Related Links
    3. 13.3Community Resources
    4. 13.4Trademarks
    5. 13.5Electrostatic Discharge Caution
    6. 13.6Glossary
  14. 14Mechanical, Packaging, and Orderable Information

1 Features

  • EMI-Resistant Architecture
  • Maximum Output Rates (one active channel):
    • 13.3 ksps (FDC2112, FDC2114)
    • 4.08 ksps (FDC2212, FDC2214)
  • Maximum Input Capacitance: 250 nF (at 10 kHz with 1 mH inductor)
  • Sensor Excitation Frequency: 10 kHz to 10 MHz
  • Number of channels: 2, 4
  • Resolution: up to 28 bits
  • System Noise Floor: 0.3 fF at 100 sps
  • Supply Voltage: 2.7 V to 3.6 V
  • Power Consumption: Active: 2.1 mA
  • Low-Power Sleep Mode: 35 uA
  • Shutdown: 200 nA
  • Interface: I2C
  • Temperature range: -40°C to +125°C

2 Applications

  • Proximity Sensor
  • Gesture Recognition
  • Level Sensor for Liquids, including Conductive ones such as Detergent, Soap, and Ink
  • Collision Avoidance
  • Rain, Fog, Ice, Snow Sensor
  • Automotive Door and Kick Sensors
  • Material Size Detection

3 Description

Capacitive sensing is a low-power, low-cost, high-resolution contactless sensing technique that can be applied to a variety of applications ranging from proximity detection and gesture recognition to remote liquid level sensing. The sensor in a capacitive sensing system is any metal or conductor, allowing for low cost and highly flexible system design.

The main challenge limiting sensitivity in capacitive sensing applications is noise susceptibility of the sensors. With the FDC2x1x innovative EMI resistant architecture, performance can be maintained even in presence of high-noise environments.

The FDC2x1x is a multi-channel family of noise- and EMI-resistant, high-resolution, high-speed capacitance-to-digital converters for implementing capacitive sensing solutions. The devices employ an innovative narrow-band based architecture to offer high rejection of noise and interferers while providing high resolution at high speed. The devices support a wide excitation frequency range, offering flexibility in system design. A wide frequency range is especially useful for reliable sensing of conductive liquids such as detergent, soap, and ink.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
FDC2112, FDC2212WSON (DNT 12)4.00 mm x 4.00 mm
FDC2114, FDC2214WQFN (RGH 16)4.00 mm x 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

FDC2212 FDC2214 FDC2112 FDC2114 4_channel_block_snoscz5.gif