QT114

www.DataSheet4U.com CHARGE-TRANSFER QLEVEL™ SENSOR IC ! ! ! ! ! ! ! ! ! Limit sensing of almost any fluid or powder 2-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 QProx™ QT114 Vcc Out1 Out2 Filt 1 8 Gnd Sns2 Sns1 Pol QT114 2 3 4 7 6 5 APPLICATIONS ! ! ! Process controls Vending machines Automotive fluids ! ! ! Consumer appliances Medical fluid sensing Soil moisture sensing DESCRIPTION The QT114 QuickLevel™ 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 func...