Overview
The FDC2112DNTR, produced by Texas Instruments, is a 2-channel, 12-bit capacitance-to-digital converter designed for high-resolution and high-speed 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 FDC2112 is particularly suited for applications requiring fast sample rates, making it ideal for sensing fast-moving targets.
Capacitive sensing is a low-power, contactless technique that can be applied to various applications, including proximity detection, gesture recognition, and remote liquid level sensing. The sensor in such systems can be any metal or conductor, allowing for highly flexible system design.
The main challenge in capacitive sensing is noise susceptibility, but the FDC2x1x resonant sensing architecture maintains performance even in the presence of fluorescent light and other interferers.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | WSON (DNT) | 12 pins |
| Operating Temperature Range | -40°C to 125°C | |
| Resolution | Up to 12 bits | |
| Number of Channels | 2 | |
| Maximum Output Rate (one active channel) | 13.3 kSPS | |
| Maximum Input Capacitance | 250 nF (at 10 kHz with 1 mH inductor) | |
| Sensor Excitation Frequency | 10 kHz to 10 MHz | |
| Supply Voltage | 2.7 V to 3.6 V | |
| Power Consumption (Active) | 2.1 mA | |
| Low-Power Sleep Mode | 35 µA | |
| Shutdown Mode | 200 nA | |
| Interface | I2C |
Key Features
- EMI-Resistant Architecture: Provides high rejection of out-of-band noise.
- High-Speed Sampling: Up to 13.3 kSPS for fast-moving targets.
- High Resolution: Up to 12 bits, with the FDC221x series offering up to 28 bits.
- Wide Excitation Frequency Range: 10 kHz to 10 MHz, useful for sensing conductive liquids.
- Low Power Consumption: Active mode: 2.1 mA, Sleep mode: 35 µA, Shutdown mode: 200 nA.
- I2C Interface: For device configuration and data transmission.
- Configurable Interrupt Output: Notifies the host of system status changes.
- Shutdown Mode: Saves current using the SD pin.
Applications
- Proximity Sensing: Detecting the presence or absence of objects.
- Gesture Recognition: Recognizing hand or finger gestures.
- Liquid Level Sensing: For both conductive and non-conductive liquids.
- Collision Avoidance: In automotive and industrial applications.
- Automotive Door and Kick Sensors: For detecting the presence of objects near vehicle doors or kick areas.
- Material Size Detection: Detecting the size or presence of materials.
- Rain, Fog, Ice, Snow Sensors: Environmental sensing in various conditions.
Q & A
- What is the resolution of the FDC2112DNTR?
The FDC2112DNTR has a resolution of up to 12 bits.
- How many channels does the FDC2112DNTR support?
The FDC2112DNTR supports 2 channels.
- What is the maximum output rate of the FDC2112DNTR?
The maximum output rate is 13.3 kSPS for one active channel.
- What is the maximum input capacitance of the FDC2112DNTR?
The maximum input capacitance is 250 nF at 10 kHz with a 1 mH inductor.
- What is the supply voltage range for the FDC2112DNTR?
The supply voltage range is 2.7 V to 3.6 V.
- What is the power consumption in active mode?
The power consumption in active mode is 2.1 mA.
- What is the power consumption in low-power sleep mode?
The power consumption in low-power sleep mode is 35 µA.
- What is the power consumption in shutdown mode?
The power consumption in shutdown mode is 200 nA.
- What interface does the FDC2112DNTR use?
The FDC2112DNTR uses an I2C interface.
- What is the operating temperature range of the FDC2112DNTR?
The operating temperature range is -40°C to 125°C.
