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AN3342 Datasheet(PDF) 14 Page - STMicroelectronics |
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AN3342 Datasheet(HTML) 14 Page - STMicroelectronics |
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14 / 39 page  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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