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[FAQ] Sensors in Range Hoods

Part Number: LDC3114
Other Parts Discussed in Thread: HALL-HMI-ROCKER-EVM, DRV5032

Question: Can home appliances – specifically range hoods – use position sensors such as Inductive sensors for push-buttons, or Hall-effect sensors for rocker switches?

 Answer: Yes, in many cases – including appliances - controls that have traditionally been supported by mechanical switches can indeed be implemented with inductive sensors or Hall-effect sensors. The remainder of this note provides two examples where these sensors are used for vent hood controls.

Use case #1: Push-button control of fan/ventilation and light control.

The image below shows a range hood control cluster with five push-buttons that control the exhaust fan speed and the under-hood lighting.
These push-buttons can be implemented with inductive sensors. What would be the best way to do this?
Please see the tables below for device recommendations and links to application notes and other documents.

Recommended Products

Device Data Sheet Description System-level Benefits
LDC3114 LDC3114.pdf 4-channel inductance-to-digital converter for
low-power proximity and touch-button sensing

Device analog & digital features coupled with internal algorithms
make thisa best-in-class device for push-button applications.

The raw data output supports estimation of the button-press force,
which could be used to expand a button’s function beyond the usual
ON/OFF behavior.

LDC2112

LDC2114

LDC2114.pdf 2 or 4- Inductive Touch Solution for Low-Power
HMI Button Applications
Device analog & digital features coupled with internal algorithms make
this a best-in-class device for push-button applications. The

Related Documents

Title Description Summary
Replacing Mechanical Switches with Inductive Sensors App brief A brief survey of the parameters and features that make LDCs a great way
to implement push-button functions for many applications.
Design Considerations for Inductive Touch Buttons for
the Human-to-Machine Interface
App brief A brief survey of the major care-abouts for inductive touch buttons.
Evaluation module for inductive touch and magnetic
dial contactless user-interface design
Application EVM
with GUI and
user’s guide
This EVM features eight push-buttons and a dial based on Hall sensor technology.
The EVM + GUI provide a convenient platform for experimentation and the user’s
guide provides details on the EVM design and functions.

Use case #2: Rocker switch control of fan/ventilation and light control.

One possible goal of a range hood design is to have hidden fan and light controls because push-buttons on the front of the unit may be considered undesirable.
If the controls are located on the underside of the range hood, it may be difficult to navigate and control push-buttons by touch alone.
In this case, rocker switches may be the best choice, and these can be implemented using Hall-effect devices.
Please see the tables below for device recommendations and links to application notes and other documents.

Device Data Sheet Description System-level Benefits
DRV5033FADBZ DRV5033.pdf Digital-Omnipolar-Switch Hall Effect Sensor
BOP Max/BRP Min = ±6.8mT/±0.5mT

 

 

The various sensitivity levels allow for many magnet sizes and
placement combinations.

DRV5033JDBZ DRV5033.pdf

Digital-Omnipolar-Switch Hall Effect Sensor
BOP Max/BRP Min = ±12mT/±1mT

DRV5032 DRV5032.pdf

Digital-Omnipolar-Switch Hall Effect Sensor
BOP Max/BRP Min = ±63mT/±30mT

Related Documents

Title Description Summary
Evaluation module for human machine interface
(HMI) rocker switch using Hall-effect switches
HALL-HMI-ROCKER-EVM
and user’s guide
A brief survey of the parameters and features that make LDCs
a great way to implement push-button functions for many applications.

Additional Tools and Resources