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STM8T141 bảng dữ liệu(PDF) 11 Page - STMicroelectronics

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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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