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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3342 датащи(PDF) 13 Page - STMicroelectronics |
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AN3342 датащи(HTML) 13 Page - STMicroelectronics |
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13 / 39 page  AN3342 ProxSense line management Doc ID 18461 Rev 3 13/39 5 ProxSense line management 5.1 ProxSense line management overview Since the STM8TL5xxx provides a ProxSense interface, it is mainly used to perform capacitance variation acquisition. The principle of this interface is to transfer a charge from a capacitance (the electrode CX) to another one (the sample CS, inside the MCU) by driving the PXS_TX and activating some switches. This allows detection of proximity as well as touch by monitoring on PXS_RX. The many features of the ProxSense interface include: ● 10 independent receiver channels, allowing 10 measurements to be performed in parallel ● Each of the 10 receiver channels can be associated with two different pins, effectively allowing an application to have up to 20 receiver channels. ● Each receiver channel can be independently configured to perform projected capacitance measurements. ● The size of each CS capacitor can be independently configured with 5 bits of resolution. Figure 6 shows a simplified functional schematic of the ProxSense interface. Figure 6. ProxSense management 1. The receiver and transmit numbers are application dependent. MS18955V1 PXS_RX PXS_TX Touch key 1K 1K (1) (1) 1K 1K |
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