STM8S-DISCOVERY STMicroelectronics, STM8S-DISCOVERY Datasheet - Page 10

• Manufacturer Part Number: STM8S-DISCOVERY
• Description: EVAL KIT STM8S DISCOVERY
• Manufacturer: STMicroelectronics
• Series: STM8Sr
• Type: MCUr

Specifications of STM8S-DISCOVERY

• Contents: Board
• Processor To Be Evaluated: STM8S
• Processor Series: STM8
• Interface Type: USB, I2C, SPI, UART
• Operating Supply Voltage: 5 V
• Silicon Manufacturer: ST Micro
• Core Architecture: STM8
• Core Sub-architecture: STM8
• Silicon Core Number: STM8
• Silicon Family Name: STM8L1xx
• Kit Contents: Brd, Cable, Doc
• Rohs Compliant: No
• For Use With/related Products: STM8S
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 497-10040

Hardware and layout
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Single touch sensing
A touch sensing button TS1 is available on the STM8S-DISCOVERY (see
Figure 10. Touch sensing schematic
To disable the touch sensing interface and to use PC1, PC2 and PC3 as standard I/O, you
need to unsolder the 2-1 connection and solder 2-3 connection on SB4 and SB3, you also
need to unsolder the R2 resistor.
RC acquisition principle
The RC acquisition method detects a human touch on key touch sensor (TS1) by measuring
the small variation of the touch electrode capacitance. Electrode capacitance is periodically
charged and discharged through a fixed resistor (R6).
The capacitance value depends on the following parameters: electrode area (A), relative
dielectric constant of the insulator (eR), the relative permittivity of air (e0) and the distance
between the two electrodes.
For more information about touch sensing please refer to AN2927.
Doc ID 16361 Rev 2
Figure
10).
UM0817