SNOSCZ4A April   2015  – October 2024 FDC1004-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 I2C Interface Voltage Level
    7. 5.7 I2C Interface Timing
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 The Shield
      2. 6.3.2 The CAPDAC
      3. 6.3.3 Capacitive System Offset Calibration
      4. 6.3.4 Capacitive Gain Calibration
    4. 6.4 Device Functional Modes
      1. 6.4.1 Single Ended Measurement
      2. 6.4.2 Differential Measurement
    5. 6.5 Programming
      1. 6.5.1 Serial Bus Address
      2. 6.5.2 Read/Write Operations
      3. 6.5.3 Device Usage
        1. 6.5.3.1 Measurement Configuration
        2. 6.5.3.2 Triggering Measurements
        3. 6.5.3.3 Wait for Measurement Completion
        4. 6.5.3.4 Read of Measurement Result
    6. 6.6 Register Maps
      1. 6.6.1 Registers
        1. 6.6.1.1 Capacitive Measurement Registers
      2. 6.6.2 Measurement Registers
      3. 6.6.3 Measurement Configuration Registers
      4. 6.6.4 FDC Configuration Register
      5. 6.6.5 Offset Calibration Registers
      6. 6.6.6 Gain Calibration Registers
      7. 6.6.7 Manufacturer ID Register
      8. 6.6.8 Device ID Register
  8. 7 Applications and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Liquid Level Sensor
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curve
    3. 7.3 Best Design Practices
    4. 7.4 Initialization Set Up
    5. 7.5 Power Supply Recommendations
    6. 7.6 Layout
      1. 7.6.1 Layout Guidelines
      2. 7.6.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.3 Best Design Practices

Avoid long traces to connect the sensor to the FDC1004-Q1. Short traces reduce parasitic capacitances between shield versus input channel and parasitic resistance between input channel versus GND and shield versus GND.

The sensor in many cases is simply a metal surface on a PCB, therefore the sensor must be protected with solder resist to avoid short circuits and limit any corrosion. Any change in the sensor can result in a change in system performance.