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AN3342 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

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AN3342 bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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ProxSense line management
AN3342
14/39
Doc ID 18461 Rev 3
5.2
Hardware ProxSense implementation
The STM8TL5xxx does not require any external circuitry to transfer the charge correctly.
However, 1K serial resistors are recommended (see Figure 6) for ESD robustness. Several
configurations are possible such as,
●
10 PXS_RX with 1 PXS_TX (10 measurements in parallel) or
●
10 PXS_TX with 1 PXS_RX (10 measurements in serial).
However, any combination of 20 RX and 15 TX is allowed. Up to 15 PXS_TX are allowed to
be used. Furthermore the 20 RX are organized in 2 groups, all RX belonging to the same
group being acquired simultaneously.
Advanced features such as an antenna (to detect noise) and external trigger may be
implemented via the PXS_RFIN and PXS_TRIG pins in order to increase the robustness of
the application.
The footprint shown in Figure 7 gives an example of a touch key implementation on a PCB
(for more details please refer to AN2869: Guidelines for designing touch sensing
applications).
Figure 7.
Touch key layout example
The PXS_RX pins cannot be used as GPIOs, they are dedicated to ProxSense acquisition.
Nevertheless, any PXS_RX pin can also be configured as a transmitter, this can ease the
layout in some cases, allow to get a greater number of keys in a matrix configuration for
devices with a reduced number of PXS_TX pins or save some PXS_TX pins for general
purpose functions. This is easily done using the firmware library by configuring the
acquisition bank with a RXn instead of a TXm in the transmitter definition.
MS18957V1
PXS_RX
PXS_TX
To next touchkey Rx
To next touchkey Tx



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