Overview
The FDC2214RGHR from Texas Instruments is a 4-channel, 28-bit capacitance-to-digital converter designed for high-resolution capacitive sensing applications. This device is part of the FDC2x1x family, which employs an innovative narrow-band based architecture to offer high rejection of out-of-band noise while providing high resolution at high speeds. The FDC2214 is optimized for high-resolution sensing, making it suitable for a variety of applications including proximity detection, gesture recognition, and liquid level sensing.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.7 | - | 3.6 | V |
| Supply Current (IDD) | - | 2.1 | - | mA |
| Sleep Mode Current (IDDSL) | 35 | - | 60 | µA |
| Shutdown Current (ISD) | 0.2 | - | 1 | µA |
| Maximum Input Capacitance | - | - | 250 | nF |
| Sensor Excitation Frequency | 10kHz | - | 10MHz | - |
| Maximum Sample Rate (one active channel) | - | - | 4.08kSPS | - |
| Resolution | - | - | 28 bits | - |
| System Noise Floor | - | - | 0.3fF at 100SPS | - |
| Interface | - | - | I2C | - |
| Temperature Range | -40°C | - | +125°C | - |
Key Features
- EMI-Resistant Architecture: The device features an EMI-resistant architecture, ensuring robust performance in noisy environments.
- High Resolution: Offers up to 28-bit resolution, making it suitable for high-precision capacitive sensing applications.
- High-Speed Sampling: Supports a maximum sample rate of 4.08kSPS for one active channel, facilitating applications with fast moving targets.
- Wide Excitation Frequency Range: The sensor excitation frequency can range from 10kHz to 10MHz, providing flexibility in system design.
- Low Power Consumption: Active current of 2.1mA, sleep mode current of 35µA, and shutdown current of 200nA, making it energy-efficient.
- I2C Interface: Supports I2C communication for device configuration and data transmission.
- Multi-Channel Capability: Available in 2 and 4-channel configurations, allowing for flexible system design and the ability to use multiple sensors.
- Temperature Stability: Operates over a wide temperature range of –40°C to +125°C.
Applications
- Proximity Detection: Ideal for detecting the presence of conductive or non-conductive targets.
- Gesture Recognition: Can be used in applications requiring gesture recognition and touchless interfaces.
- Liquid Level Sensing: Suitable for sensing the level of various types of liquids, including conductive and non-conductive liquids.
- Remote Sensing: The large maximum input capacitance allows for the use of remote sensors, tracking environmental changes such as temperature and humidity.
- Industrial Automation: Useful in industrial settings for sensing and monitoring various parameters.
Q & A
- What is the maximum sample rate of the FDC2214?
The maximum sample rate for one active channel is 4.08kSPS.
- What is the resolution of the FDC2214?
The FDC2214 offers up to 28-bit resolution.
- What is the supply voltage range for the FDC2214?
The supply voltage range is from 2.7V to 3.6V.
- What is the power consumption in active mode?
The active mode power consumption is 2.1mA.
- What is the power consumption in sleep mode?
The sleep mode power consumption is 35µA.
- What is the shutdown current?
The shutdown current is 200nA.
- What interface does the FDC2214 use?
The FDC2214 uses an I2C interface.
- What is the temperature range for the FDC2214?
The temperature range is from –40°C to +125°C.
- What is the maximum input capacitance for the FDC2214?
The maximum input capacitance is 250nF at 10kHz with a 1mH inductor.
- What are some common applications of the FDC2214?
Common applications include proximity detection, gesture recognition, liquid level sensing, and remote sensing.
