QT114-DG QUALCOMM [QUALCOMM Incorporated], QT114-DG Datasheet

QT114-DG

Manufacturer Part Number

QT114-DG

Description

Manufacturer

QUALCOMM [QUALCOMM Incorporated]

Datasheet

1.QT114-DG.pdf (14 pages)

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" " " " Limit sensing of almost any fluid or powder

" " " " Two-tier level sensor - Hi / Low limits with one probe

" " " " Only one external part required - a 5¢ capacitor

" " " " Uses internal probes or external electrodes

" " " " Active high or active low outputs

" " " " Slosh filter averages response of moving fluids

" " " " LED drive capable on both outputs

" " " " 2.5 to 5V 20µA single supply operation

" " " " HeartBeat™ health indicator on both outputs

" " " " RoHS compliant package

DESCRIPTION -

The QT114 QLevel™ charge-transfer (“QT”) sensor IC is specifically designed to detect point level in fluids and

powders. It will project a sense field through almost any dielectric, like glass, plastic, or ceramic, to sense level on

the inside of a vessel, from its exterior. It has the unique capability of independently sensing two trip points when

used with structured electrodes having two tiers.

The QT114 does not have sensing timeouts, drift compensation, or other functions which would interfere with level

sensing. Its threshold levels are fixed, and the amount of signal required to exceed a threshold is dependent on

circuit gain and electrode size and loading, all of which are under the control of the designer.

The QT114 requires only a single inexpensive capacitor in order to function. One or two LEDs can also be added to

provide a visual sensing indication.

Power consumption is under 20mA in most applications, allowing operation from Lithium cells for many years. In

most cases the power supply needs only minimal regulation.

The QT114 employs numerous signal acquisition and processing techniques pioneered by Quantum. No external

switches, opamps, or other analog components aside from CS are required.

A unique feature is the 'slosh filter', a detection integrator which averages detections over a rolling 15 second

interval before activating or deactivating the OUT pins. This filter allows use of the QT114 with violently moving

fluids, for example in a moving vehicle, that would otherwise cause the outputs to flicker between two states.

The device also includes selectable output polarity, allowing both output lines to be made either active-high or

active-low. It also includes the Quantum-pioneered HeartBeat™ signal, allowing a host controller to monitor the

health of the QT114 continuously if desired. By using the charge transfer principle, the IC delivers a level of

performance clearly superior to older technologies. It is specifically designed to replace electromechanical devices

like float switches, thermistors, and conductance probes.

! Process controls

! Vending machines

APPLICATIONS -

-40

C to +70

C to +85

! Consumer appliances

! Automotive fluids

AVAILABLE OPTIONS

QT114-ISG

SOIC

Out1

Out2

Vcc

Filt

QT114-DG

8-PIN DIP

! Medical fluid sensing

! Soil moisture sensing

EVEL

™ S

QT114 R1.04/1106

ENSOR

QT114

Gnd

Sns2

Sns1

Pol

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