ST STM8S-DISCOVERY User manual

July 2011 Doc ID 16361 Rev 3 1/18

UM0817

User Manual

STM8S-DISCOVERY

Introduction

The STM8S-DISCOVERY is a quick start evaluation board which helps you to discover the

STM8 features, and to develop and share your own application. It is based on an STM8S105

and includes an embedded debugger, ST-LINK, and a touch sensing button. Numerous

applications are available from the STM8S-Discovery web page.

Features

■STM8S105C6T6 microcontroller, 32 KB Flash, 2 KB RAM, 1 KB EEPROM

■Powered by USB cable between PC and STM8S-DISCOVERY

■Selectable power of 5 V or 3.3 V

■Touch Sensing button, TS1

■User LED, LD1

■Extension header for all I/Os

■Wrapping area for users own application

■Embedded ST-LINK for STM8S

■USB interface for programming and debugging

■SWIM debug support

Figure 1. STM8S-DISCOVERY evaluation board

www.st.com

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Contents UM0817

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Contents

1 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 STM8S105C6T6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 ST-LINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2.1 Using the ST-LINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2.2 Using the ST-LINK on other STM8S applications . . . . . . . . . . . . . . . . . . 8

2.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4 Single touch sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Daughterboard connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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UM0817 Quick start

Doc ID 16361 Rev 3 3/18

1 Quick start

It is very simple to get started using the STM8S-DISCOVERY, just follow these four steps:

1. Connect the STM8S-DISCOVERY to a PC with a USB cable.

2. Press the TS1 button, and observe LED LD1 blinking.

3. Press the TS1 button to change blinking speed.

4. Visit www.st.com/stm8s-discovery and follow the tutorial, then discover other

applications.

The STM8S-DISCOVERY helps you develop and share your own application.

You can discover more of the STM8S features by downloading and executing the proposed

programs in the project list.

Note: The software code corresponding to this application is available under the name Discover

in the project list of the STM8S-Discovery web page.

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Hardware and layout UM0817

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2 Hardware and layout

The STM8S-DISCOVERY is designed around the STM8S105C6T6 microcontroller in an

LQFP48 package. It has two distinct sections that may be separated, the STM8S105C6T6

module and the ST-LINK module.

Figure 2 illustrates the connections between the STM8S105C6T6 and its peripherals (ST-

LINK, touch-sensing button, LED and connectors).

Figure 3 helps you to locate these features on the STM8S-DISCOVERY board, as well as

the potential point of separation (for more details refer to Section 2.2.2: Using the ST-LINK

on other STM8S applications).

Figure 2. Hardware block diagram

STM8S105C6T6

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Figure 3. Top layout

USB connector

ST-LINK JTAG

USB data transfer LED

ST-LINK core

SWIM connector

ST-LINK module

Possible separation point

LED (LD1)

Power supply jumper

External Osc. (16 MHz)

STM8S105C6T6

Touch sensing button (TS1)

Wrapping area

SO16 footprint

STM8S105C6T6 module

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2.1 STM8S105C6T6 microcontroller

Figure 4. STM8S105C6T6 package

This device provides the following benefits:

●Reduced system cost

– Integrated true data EEPROM for up to 300 K write/erase cycles

– High system integration level; internal clock oscillators, brown-out reset, watchdog.

●Performance and robustness

– 16 MHz CPU clock frequency

– Up to 38 I/Os on a 48-pin package including 16 high sink outputs

– Robust I/O immune against current injection

– Independent watchdogs with separate clock source

– Flexible clock control, 4 master clocks (HSI, LSI, HSE and external HSE)

– Clock security system

– A family of products for applications with 2.95 V to 5.5 V operating supply

●Short development cycles

– Applications scalability across common family product architecture with

compatible pinout, memory map and modular peripherals.

– Full documentation and a wide choice of development tools

– Standard S/W library for firmware and touch sensing development quick start

– Numerous application notes and firmware examples available

●Product longevity

– Advanced core and peripherals made in state-of-the-art technology

– Low power modes (wait, active-halt, halt)

– Auto wake-up timer for active halt

– Permanently active, low consumption

●Other features

– Nested interrupt controller with 32 interrupts

– Up to 37 external interrupts on 6 vectors

– 2 x 16-bit general purpose timers; with 2+3 CAPCOM channels (IC, OC or PWM)

– Advanced control timer: 16-bit, 4 CAPCOM channels, 3 complementary outputs,

dead- time insertion and flexible synchronization

– 8-bit basic timer with 8-bit prescaler

– UART with clock output for synchronous operation, Smartcard, IrDA, LIN

– SPI interface up to 8 Mbit/s

– I2C interface up to 400 Kbit/s

– Analog-to-digital converter 10-bit, ±1 LSB ADC with up to 10 multiplexed channels

The STM8S105C6T6 8-bit microcontroller offers:

1 Kbyte true data EEPROM

32 Kbytes of Flash program memory

2 Kbytes RAM

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Figure 5. STM8S105 block diagram

For more information see the STM8S105xx datasheet (Doc ID 14771) on the ST website.

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2.2 ST-LINK

The ST-LINK provides a USB interface for programming and debugging using a single wire

interface module (SWIM). The ST-LINK module of the STM8S-DISCOVERY also supplies

5 V and 3.3 V to the STM8S105C6T6 module.

2.2.1 Using the ST-LINK

Figure 6. Typical configuration

Note: The driver for ST-LINK is installed automatically when the USB is connected.

For information about debugging and programming features refer to ST-LINK UM0627,

UM0036 STVD and RN0011 STVP. For information about SWIM refer to UM0470.

2.2.2 Using the ST-LINK on other STM8S applications

You can connect your ST-LINK to other STM8S applications in 2 ways.

●By removing the solder bridges: This way uses the ST-LINK without breaking the PCB.

Unsolder the two solder bridges SB1 and SB2 under the SWIM connector.

See Figure 7. You can re-solder the two bridges at a later date thus keeping the

STM8S-DISCOVERY usable.

●By removing it from your board: This way constitutes a good alternative to programming

the STM8S devices in other applications. See Figure 8.

Note: This ST-LINK only supports the STM8S family. Do not use it with other STM8 families.

Figure 7. ST-LINK without breaking the PCB

Hardware requirements:

- USB cable type A to B

- Computer with Windows 2000, XP or Vista OS

ST Toolset (ST Visual Develop and ST Visual Program)

Software requirement:

which support ST-LINK SWIM

Remove SB1 and SB2 solder bridges

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Figure 8. Separated ST-LINK module

Warning: By removing this module you will lose power supply on the

STM8S105C6T6 evaluation board. In consequence, you will

not be able to program and use the STM8S105C6T6 board

without a SWIM cable and an external power supply.

To reconnect your STM8S105C6T6 use connector CNn see

Section 3: Daughterboard connection.

2.3 Power supply and power selection

The power supply is provided by a USB connector. Jumper JP1 selects the VDD value (5 V

or regulated 3.3 V) see Figure 9.

Figure 9. Power selection

SWIM

STLink

STM8S105C6

eval board

STM8S105C6T6

VDD = 5 V

VDD = 3.3 V

Hardware and layout UM0817

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2.4 Single touch sensing

A touch sensing button TS1 is available on the STM8S-DISCOVERY (see Figure 10).

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.

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