Contents
What is capacitance digital converter?
PCap04 is a capacitance-to-digital converter (CDC) with integrated digital signal processor (DSP) for on-chip data post-processing. Its front end is based on the PICOCAP principle. This conversion principle offers outstanding flexibility with respect to power consumption, resolution and speed.
How are sensors calibrated?
In measurement technology, sensor calibration refers to the tasks that serve to determine – under defined conditions – the relationship between the values of a measurand output by a measurement instrument, such as a sensor or measuring system, with corresponding measurement uncertainty and the corresponding values of a …
How do you calibrate a humidity sensor?
How do I calibrate the Relative Humidity Sensor?
- Place a handful of salt in the bottom of a jar (quart or liter size is fine).
- Add a little water to the jar so that the salt is wet.
- Place the Relative Humidity Sensor in the jar.
- Seal the jar.
What is capacitive proximity sensor?
Capacitive proximity sensors are non-contact devices that can detect the presence or absence of virtually any object regardless of material. They utilize the electrical property of capacitance and the change of capacitance based on a change in the electrical field around the active face of the sensor.
How does a capacitance to digital converter work?
As pressure is applied to the sensor, the capacitive plates move closer together. The reduced distance between the plates increases the capacitance. A temperature sensor can be used to detect the temperature change of the sensor to compensate its characteristics change with temperature.
What does a capacitive sensor do?
Capacitive sensors are most often used to measure the change in position of a conductive target. But capacitive sensors can be effective in measuring presence, density, thickness, and location of non-conductors as well. Non-conductive materials like plastic have a different dielectric constant than air.
How capacitive sensors works illustrate the working principle?
Noncontact capacitive sensors work by measuring changes in an electrical property called capacitance. Capacitance describes how two conductive objects with a space between them respond to a voltage difference applied to them. Larger and closer objects cause greater current than smaller and more distant objects.
What kind of capacitive sensor is ad7746?
The AD7745/AD7746 are designed for floating capacitive sensors. For capacitive sensors with one plate connected to ground, the AD7747 is recommended. The parts have an on-chip temperature sensor with a resolution of 0.1°C and accuracy of ±2°C.
What is the capdac value of the ad7745?
The AD7745/AD7746 has CapDACs that can be used to compensate for the bulk capacitance of a sensor element. For the AD7745/AD7746, the CapDACs have a full-scale value of 17 pF minimum and 21 pF typical. Therefore, for a given CapDAC setting, the capacitances can vary significantly from part to part.
What is the temperature range of the ad7745?
The AD7745/AD7746 have a 2-wire, I 2 C-compatible serial interface. Both parts can operate with a single power supply from 2.7 V to 5.25 V. They are specified over the automotive temperature range of –40°C to +125°C and are housed in a 16-lead TSSOP package.
Is there an evaluation board for the ad7746?
The EVAL-AD7746EBZ is a fully featured evaluation board for the AD7746. The evaluation board is operated with a PC via a standard USB connection with software provided enabling the user to perform detailed analysis of the CDC’s performance. This software includes the technical note describing the operation and set up of the evaluation board.