MC34940| Datasheet

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Freescale Semiconductor Technical Data

Document number: MC34940 Rev 4, 11/2006

Electric Field Imaging Device
The MC34940 is intended for cost-sensitive applications where non-contact sensing of objects is desired. When connected to external electrodes, an electric field is created. The MC34940 detects objects in this electric field. The IC generates a low-frequency sine wave, which is adjustable by using an external resistor and is optimized for 120 kHz. The sine wave has very low harmonic content to reduce harmonic interference. The MC34940 also contains support circuits for a microcontroller unit (MCU) to allow the construction of a two-chip E-field system. Features Supports up to 7 Electrodes Shield Driver for Driving Remote Electrodes Through Coaxial High-Purity Sine Wave Generator Tunable with External Resistor Response Time Tunable with External Capacitor Can support up to 28 touch pad sensors Pb-Free and RoHS compliant

MC34940

ELECTRONIC FIELD IMAGING DEVICE

Typical Applications Appliance Control Panels and Touch Sensors Linear and Rotational Sliders Spill Over Flow Sensing Measurement Refrigeration Frost Sensing Industrial Control and Safety Systems Security Proximity Detection for Wake-Up Features Touch Screens Garage Door Safety Sensing PC Peripherals Patient Monitoring Point of Sale Terminals Size Detection Liquid Level Sensing ORDERING INFORMATION
Device Name MC34940EG/R2 Temperature Range 0 to 90 C Drawing CASE 751E-04 Package SOICW-24 EG SUFFIX (Pb-FREE) 24-TERMINAL SOICW CASE 751E-04

DGND N/C SHIELDEN C B A LEVEL LPCAP ROSC VDDCAP VPWR VCCCAP

N/C E7 E6 E5 E4 E3 E2 E1 TEST GND SHIELD AGND

Pin Connections