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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM8T141 датащи(PDF) 11 Page - STMicroelectronics |
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STM8T141 датащи(HTML) 11 Page - STMicroelectronics |
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11 / 50 page  STM8T141 STM8T ProxSense technology Doc ID 15699 Rev 7 11/50 Figure 5. STM8T measuring circuitry 1. RX must be placed as close as possible to the STM8T device. The principle of charge transfer is to charge the electrode capacitance (CX) using a stable power supply. When CX is fully charged, part of the accumulated charge is transferred from CX to an external sampling capacitance, referred to as CS. The transfer cycle is repeated until the voltage across the sampling capacitor CS reaches the end of acquisition reference voltage (VTRIP). The change in the electrode capacitance is detected by measuring the number of transfer cycles composing a burst (see Figure 6). Throughout this document the following naming conventions apply: ● The charge transfer period ( tTRANSFER) refers to the charging of CX and the subsequent transfer of the charge to CS. ● The burst cycle duration (tBURST) is the time required to charge CS to VTRIP. ● The sampling period (tSAMPLING) is the acquisition rate. Figure 6. Conversion period examples Ai15249a CX Cx (~20 pF) CT (~5 pF) Earth Serial resistor (RX)(1) STM8T141 CS CS (a few nF) |
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