com Freescale Semiconductor Technical Data Document order number: MC34940 Rev 2.
0, 2/2006 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.
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