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NXP PCA8886 Dual Channel Capacitive Proximity Switch Datasheet
The PCA8886 is a low power dual channel capacitive proximity switch that uses a patented digital method to detect changes in capacitance on remote sensing plates. It features continuous auto-calibration to compensate for static capacitance changes, allowing remote sensing plates to be connected directly to the IC or remotely via a coaxial cable.
Key features include adjustable sensitivity and response time, a wide input capacitance range of 10 pF to 60 pF, and a large voltage operating range of 3 V to 9 V. The device is designed for battery-powered applications with a typical current consumption of 6 µA and is AEC-Q100 compliant for automotive use.
NXP PCA8886 specifications
| Input capacitance range | 10 pF to 60 pF |
|---|---|
| Voltage operating range | 3 V to 9 V |
| Typical current consumption | 6 µA |
| Operating temperature range | -40 °C to +85 °C |
| Package type | TSSOP 16 |
Source: NXP PCA8886 Dual Channel Capacitive Proximity Switch Datasheet
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Questions answered in these manuals
What is the PCA8886 and what does it detect?
The PCA8886 is a low power dual channel capacitive proximity switch that uses a patented digital method to detect a change in capacitance on remote sensing plates.
From: NXP PCA8886 Dual Channel Capacitive Proximity Switch Datasheet
What is the operating voltage range for the PCA8886?
The device operates with a wide voltage range from 3 V to 9 V.
From: NXP PCA8886 Dual Channel Capacitive Proximity Switch Datasheet
How does the auto-calibration feature protect against environmental changes?
The devices digitally filter out very slow and very quick changes in capacitance at the input, making performance less affected by dirt, humidity, or freezing temperatures.
From: NXP AN11122 Water and Condensation Safe Touch Sensing Application Note
What is the recommended gap between the sensor plate and ground ring?
It is recommended that the gap be kept larger than the overlay thickness, though a 2.2 mm gap is sufficient even if the overlay is thicker than 2 mm.
From: NXP AN11122 Water and Condensation Safe Touch Sensing Application Note
What is the maximum total capacitance allowed on the sensor input for reliable operation?
The total capacitance on the input must be lower than 60 pF to ensure the control loop works correctly.
What is the lowest resistance value allowed for the Rg component?
The lowest value allowed for the Rg resistance is 20 kOhm.