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MC34940 Arkusz danych(PDF) 1 Page - Freescale Semiconductor, Inc |
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MC34940 Arkusz danych(HTML) 1 Page - Freescale Semiconductor, Inc |
1 / 9 page Document order number: MC34940 Rev 2.0, 2/2006 Freescale Semiconductor Technical Data © Freescale Semiconductor, Inc., 2006. All rights reserved. Electric Field Imaging Device The 34940 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 34940 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 34940 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 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 Temperature Range Drawing Package MC34940EG/R2 0 to 90°C 98ASB42564B SOICW-24 34940 ELECTRONIC FIELD IMAGING DEVICE 24 LEAD (PB-FREE) SOICW 98ASB42344B Figure 1. Pin Connections N/C E7 E6 E5 E4 E3 E2 E1 TEST GND SHIELD AGND DGND N/C SHIELDEN C B A LEVEL LPCAP ROSC VDDCAP VPWR VCCCAP |
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