ST STM8A-DISCOVERY Manual de usuario

November 2012 Doc ID 023645 Rev 1 1/48

UM1574

User manual

STM8A-DISCOVERY

Discovery kit for STM8A microcontrollers

Introduction

The STM8A-DISCOVERY helps you discover the STM8AF and STM8AL automotive

microcontroller family features and develop your applications through two dedicated

application boards that can be connected together via a LIN network.

The STM8AF board can perform both CAN and LIN communications with the MCU powered

at 5 V and is ready to be connected into a network with its integrated transceiver.

The STM8AL board manages LIN slave communication through its transceiver and uses a

4-digit alphanumeric LCD display with the MCU powered at 3.3 V, offering low energy power

modes.

Both STM8AF and STM8AL boards include push buttons, LEDs, external connectors and

allow various configurations to take advantage of the numerous capabilities of the

microcontrollers.

Figure 1. STM8A-DISCOVERY

Figure 2. Applicable tools

Type Part number

Evaluation tools STM8A-DISCOVERY

STM8AF

board

STM8AL

board

www.st.com

Contents UM1574

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Contents

1 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Development toolchains supporting the STM8A-DISCOVERY . . . . . . . . . 7

3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 STM8A-DISCOVERY common resources . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1.1 Embedded ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1.2 Debugging STM8A-DISCOVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1.3 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1.4 L99PM62GXP power management IC with LIN and high speed CAN . 11

4.2 STM8AF board dedicated resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2.1 STM8AF5288T microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2.2 STM8AF board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2.3 STM8AF board Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2.4 STM8AF board solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.2.5 STM8AF board jumpers selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.2.6 STM8AF board extension connection . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3 STM8AL board dedicated resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.3.1 STM8AL3L68T microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.2 STM8AL board LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.3.3 STM8AL board Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.3.4 STM8AL board built-in IDD measurement circuit . . . . . . . . . . . . . . . . . . 28

4.3.5 STM8AL board LCD (16 segments, 4 commons) . . . . . . . . . . . . . . . . . 31

4.3.6 STM8AL board solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.3.7 STM8AL board jumpers selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.3.8 STM8AL board extension connection . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5 STM8A-DISCOVERY boards mechanical drawing . . . . . . . . . . . . . . . . 35

5.1 STM8AF board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

UM1574 Contents

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5.2 STM8AL board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6 STM8AF board electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7 STM8AL board electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

List of tables UM1574

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List of tables

Table 1. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. STM8AF board solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 3. STM8AF board jumper selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 4. STM8AF board P1 pinout microcontroller connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 5. STM8AF board P2 pinout microcontroller connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6. STM8AF board P3 pinout L99PM62GXP connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 7. LCD connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 8. STM8AL board solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 9. STM8AL board jumpers selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 10. STM8AL board P1 pinout Microcontroller connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 11. STM8AL board P2 pinout L99PM62GXP connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

UM1574 List of figures

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List of figures

Figure 1. STM8A-DISCOVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Applicable tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 3. Debugging the STM8AF microcontroller when the STM8AL board or an

external application board is connected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 4. Debugging the STM8AL microcontroller when the STM8AF board or an

external application board is connected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 5. L99PM62GXP block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 6. STM8AF board hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 7. STM8AF board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 8. STM8AF board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 9. STM8AF5288T package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 10. STM8AF5288T block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 11. STM8AL board hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 12. STM8AL board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 13. STM8AL board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 14. STM8AL3L68T package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 15. STM8AL3L68T MCU block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 16. STM8AL board IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 17. STM8AL board IDD Low power mode measurement timing diagram . . . . . . . . . . . . . . . . . 30

Figure 18. LCD segment mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 19. STM8AF board mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 20. STM8AL board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 21. STM8AF board top level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 22. STM8AF board ST-LINK/V2 (SWIM only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 23. STM8AF board MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 24. STM8AF board CAN/LIN and 12V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 25. STM8AL board top level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 26. STM8AL board ST-LINK/V2 (SWIM only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 27. STM8AL board MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 28. STM8AL board LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 29. STM8AL board IDD_measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 30. STM8AL board LIN and 12V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Conventions UM1574

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1 Conventions

Tabl e 1 provides the definitions of some conventions used in the present document.

Table 1. ON/OFF conventions

Convention Definition

Jumper JPx ON Jumper fitted

Jumper JPx OFF Jumper not fitted

Jumper JPx 1-2 Jumper is fitted between pins 1 and 2

Jumper JPx 2-3 Jumper is fitted between pins 2 and 3

Solder bridge SBx ON SBx connections closed by solder

Solder bridge SBx OFF SBx connections left open

UM1574 Quick start

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2 Quick start

The STM8A-DISCOVERY is a low-cost and easy-to-use development kit to quickly evaluate

and start a development with STM8AF and STM8AL microcontrollers family devices.

STM8AF devices offer high performance and full automotive network connectivity with high

speed CAN and LIN master/slave modes communications. STM8AL devices offer high

performance with ultra-low power management. Both comply with automotive qualification

and conform to AEC-Q100 rev G.

For more information on the STM8A-DISCOVERY and for demonstration software, visit

www.st.com/stm8a-discovery.

2.1 Getting started

1. Connect CN3 and CN4 on the STM8AF board to CN3 and CN4 on the STM8AL board.

2. Connect both type A connectors of the USB cable to a PC.

3. Then connect the mini-B connector of the USB cable to the STM8AF board.

4. All LEDs blink once on the STM8AF board and twice on the STM8AL board, then the

LIN communication between both boards starts.

5. Turn the RV1 trimmer on the STM8AF board to adjust the value from 0 to 100 on the

STM8AL board LCD through the LIN bus.

6. Push button USER1 on the STM8AF board to sequentially display the LCD bars on the

STM8AL board through the LIN bus. Push button USER2 on the STM8AF board to

sequentially switch them off one by one.

7. Push button USER1 on the STM8AL board to sequentially switch on green LEDs LD4,

LD5, LD6 and LD7 on the STM8AF board through the LIN bus. Push button USER2 on

the STM8AL board to sequentially switch them off one by one.

8. To perform or modify the Discover project related to this demo, visit www.st.com/stm8a-

discovery.

9. You can discover the STM8AF and STM8AL features, download and execute programs

proposed in the list of projects.

10. You can then develop your own application using the available examples.

2.2 System requirements

●Windows PC (XP, Vista, 7)

●USB cable (dual type A to mini-B) - included

2.3 Development toolchains supporting the STM8A-DISCOVERY

●IAR: EWSTM8

●STMicroelectronics: STVD

Features UM1574

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3 Features

The STM8A-DISCOVERY offers different features combined with STM8AF and STM8AL

boards:

STM8AF and STM8AL common board features:

●On-board ST-LINK/V2 included for debugging and programming

●Board power supply: through 5 V USB bus

●Internal dual ST662A step-up converter building the 12 Vdc when powered by USB

port

●External application power supply VBAT (up to 14 Vdc)

●16 MHz HSE XTAL crystal oscillator

●L99PM62GXP power management IC with LIN and high speed CAN with SPI control

interface and high-side drivers

●Two push buttons (USER1 and USER2)

●Extension header for L99PM62GXP including relays, high-side outputs and wake-up

capabilities

STM8AF dedicated board features:

●STM8AF5288T microcontroller featuring 64 Kbytes Flash, 2 Kbytes data EEPROM,

LIN, CAN in an 48-pin package

●Seven LEDs:

– LD1 (red/green) for USB communication

– LD2 (red) for 5 V power ON

– Five user LEDs LD3 (red) and LD4 to LD7 (green)

●RV1 potentiometer connected to the ADC peripheral

●Extension headers for MCU connectivity (full Port B, free ports pins, RESET)

STM8AL dedicated board features:

●STM8AL3L68T microcontroller featuring 32 Kbytes Flash, 1 Kbytes data EEPROM,

LCD in an 48-pin package

●Four LEDs:

– LD1 (red/green) for USB communication

– LD2 (red) for 3.3 V power ON

– 2 user LEDs LD3 (red) and LD4 (green)

●4-digit alphanumeric LCD display including 4 bars display

●Extension header for MCU connectivity (free ports pins, RESET)

UM1574 Hardware and layout

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4 Hardware and layout

This section describes STM8A-DISCOVERY hardware and layout which can be broken

down into common resources used both in STM8AF and STM8AL boards and the special

features belonging to each of them.

4.1 STM8A-DISCOVERY common resources

4.1.1 Embedded ST-LINK/V2

The ST-LINK/V2 programming and debugging tool is integrated both in STM8AF and

STM8AL boards. The embedded ST-LINK/V2 can be used to program/debug the MCU on

the board and supports SWIM for STM8 devices.

The ST-LINK/V2 must be connected with the dual type A to mini-B USB cable provided in

the blister.

Caution: First connect the dual type A on the PC side (both type A connectors must be plugged in)

then connect the mini-B USB to the board (STM8AF or STM8AL boards).

For programming or debugging the STM8A-DISCOVERY, the PC can be either connected to

the mini-B USB connector of the STM8AF or STM8AL board.

The connection on both mini-B usb of the STM8AF and STM8AL boards is not supported.

This operation can damage the boards.

For information about debugging and programming features refer to user manual UM1075

(ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32) which describes in

detail all the ST-LINK/V2 features.

Hardware and layout UM1574

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4.1.2 Debugging STM8A-DISCOVERY

The STM8A-DISCOVERY is composed by a STM8AF board connected to a STM8AL board.

A PC can be connected to the STM8AF or STM8AL board side while

programming/debugging the STM8AF5288T or the STM8AL3L68T.

●Example 1: Debugging the STM8AF microcontroller when the STM8AL board or an

external application board is connected.

Figure 3. Debugging the STM8AF microcontroller when the STM8AL board or an

external application board is connected

●Example 2: Debugging the STM8AL microcontroller when the STM8AF board or an

external application board is connected.

Figure 4. Debugging the STM8AL microcontroller when the STM8AF board or an

external application board is connected

Note: All other configuration are not supported and could damage the boards or the PC.

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