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AN3342 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Getting started with STM8TL5xxx
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AN3342 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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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
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