MSP430FR2512: MSP430FR2512 for low power proximity sensing

HI Mitch

Thanks, hope to hear back from you soon

INg

Hello Mitch

Any feedback on this enquiry?

INg

Hi INg,

The sensing range of a proximity sensor is dependent on several factors:

1. The size and shape of the proximity sensor

• The proximity range increases with the larger sensor size.
• The proximity range is also affected by the area of the object approaching the sensor.
• The shape of the sensor is limited by the end product and it varies from a solid rectangular pad to a piece of wire.

2. The sensor configuration tuning values

• The proximity range increases with higher sensitivity tuning values.
• These parameters include conversion count, conversion gain, and proximity threshold.

3. The surrounding conductors

• The proximity range increases when the separation of the sensor from other conductors (such as ground) is increased.

4. The system surrounding environment

• Increasing the sensitivity of the proximity sensor will also enlarge the effects of noise, temperature drifts and humidity drift to the system.

All of this being said - a typical range for proximity detection for capacitive sensing is roughly 5cm. This does not mean 10cm is impossible, but the proximity range will be affected by the factors mentioned above. A 10cm proximity range may also make the proximity sensor more susceptible to noise and other environmental factors.

The device should be able to meet the 20uA power consumption spec while performing proximity detection.

Thanks,

Mitch

HI Mitch

Thanks for the update, it does sound doable then.

We may go ahead to get a kit to experiment

INg