UM0970 User Manual - STMicroelectronics · June 2011 Doc ID 17693 Rev 2 1/30 UM0970 User Manual...

June 2011 Doc ID 17693 Rev 2 1/30

UM0970User Manual

STM8L-DISCOVERY

IntroductionThe STM8L-DISCOVERY helps you to discover the STM8L ultralow power features and to develop and share your applications. It is based on an STM8L152C6T6 and includes an ST-Link embedded debug tool interface, LCD (24 segments, 4 commons), LEDs and push buttons.

Figure 1. STM8L-DISCOVERY board

www.st.com

http://www.st.com

Contents UM0970

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Contents

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

1.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Development toolchain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 STM8L152C6T6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Embedded ST-Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2.1 Using the ST-Link to program/debug the STM8L on board . . . . . . . . . . 12

3.2.2 Using the ST-Link to program/debug an external STM8L application . . 12

3.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.5 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.6 Built-in IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.1 Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.2 Low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.6.3 Low power mode IDD measurement principle . . . . . . . . . . . . . . . . . . . . 15

3.6.4 Ibias current measurement procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.7 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.8 LCD (24 segments, 4 commons) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4 Extension connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5 Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6 Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

UM0970 Quick start

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1 Quick start

The STM8L-DISCOVERY is a low-cost and easy-to-use development kit to quickly evaluate and start a development with an STM8L ultralow power microcontroller.

For more information on the STM8L-DISCOVERY and for demonstration software visit www.st.com/stm8l-discovery.

1.1 Getting started1. Check jumper positions on the board, JP1 and CN3 ON (Discovery selected).

2. Connect the STM8L-DISCOVERY board to a PC with a USB cable to power the board. Red LED LD2 (PWR) then lights up.

3. Function 1 is executed and each click on user button B2 changes the executed function as described in Table 1.

To study or modify the DISCOVER project related to this demo, visit www.st.com/stm8l-discovery and follow the tutorial. Discover the STM8L features, download and execute programs proposed in the list of projects. This site also contains examples from which you can develop your own applications.

1.2 System requirements● Windows PC (2000, XP, Vista)

● A/Mini-B USB cable

Table 1. Functions

Function LED LD3/4 Bars Value displayed

1 Blink STM8L VDD voltage measured

2 Off STM8L consumption measured in Run mode

3 Off STM8L consumption measured in Low power mode, LCD on

4 Off STM8L consumption measured in Low power mode, LCD off

5 Off STM8L consumption measured in Halt mode, LCD off

Quick start UM0970

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1.3 Development toolchain● IAR, Embedded Workbench® for STM8

● STMicroelectronics, ST Visual Develop (STVD)

1.4 Demonstration softwareDemonstration software is preloaded in the board's Flash memory. This demonstration uses the built-in IDD measurement feature of the STM8L-DISCOVERY to automatically measure and display on the LCD the consumption of the MCU in run and low power modes.

The latest versions of this demonstration source code and associated documentation can be downloaded from www.st.com/stm8l-discovery.

1.5 Order codeTo order the STM8L ultralow power Discovery, use the order code STM8L-DISCOVERY.

UM0970 Features

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2 Features

The STM8L-DISCOVERY offers the following features:

● STM8L152C6T6 microcontroller, 32 KB Flash, 2 KB RAM, 1 KB EEPROM in 48-pin LQFP

● On-board ST-Link with selection mode switch to use the kit as a stand-alone ST-Link (with SWIM connector for programming and debugging)

● Two red LEDs; LD1 for USB communication, LD2 for 3.3 V power on

● Designed to be powered by USB or an external supply of 5 V or 3.3 V

● Can supply target application with 5 volts and 3 volts

● Two user LEDs, LD3 and LD4 (green and blue)

● Two push buttons (User and Reset)

● IDD current measurement

● LCD 28-pin DIP (24 segments, 4 commons)

● Extension header for all QFP48 I/Os for quick connection to prototyping board for easy probing

Hardware and layout UM0970

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3 Hardware and layout

The STM8L-DISCOVERY is designed around the STM8L152C6T6 microcontroller in a 48-pin LQFP package.

Figure 2 illustrates the connections between the STM8L152C6T6 and its peripherals (ST-Link, push button, LED, LCD and connectors).

Figure 3 and Figure 4 help you to locate these features on the STM8L-DISCOVERY.

Figure 2. Hardware block diagram

Blue LEDLD4

B2USER

I/O

MiniUSB

Green LEDLD3

B1RST

RESET

I/OI/O

P1

Hea

der

P3

Hea

der

P2 Header

SW

IM

LCD (24 segments, 4 commons)

IDDmeasurement

Embedded ST-LINK

STM8L152C6T6

UM0970 Hardware and layout

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Figure 3. Top layout

ST-Link

LCD 24 segments

IDD measurement

STM8L152C6T6

B2

CN2

JP1

LD3LD4

B1

CN3

IDD module

LD1

LD2

User button

LED blue

Reset button

LED green

SWIM connector

COM

power

SB1,2X2 crystal

D2 diodeD1 diode

ST-Link/Discoveryselector

+3.3V power supplyinput

+5V power supplyinput


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Figure 4. Bottom layout

P1

P2

SB4,6,8,10

PRG-32SB3,5,7,9

DEFAULT

SB11,12,14

SB13,15

SB16

SB17

P3

IDD_Measurement

B2-USER

B1-RESET

X3 crystal

connector

connector

connector

JP1IDD

(RESERVED)


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3.1 STM8L152C6T6 microcontrollerThis 8-bit ultralow power MCU has 32 KB Flash, 2 KB RAM, 1 KB data EEPROM, RTC, LCD, timers, USART, I2C, SPI, ADC, DAC and comparators.

Figure 5. STM8L152C6T6 package

This device provides the following benefits:

● Ultralow power proprietary 130 nm technology: Speed and power consumption independent of MCU power supply, Ultralow leakage

● Ultralow power design (clock gating, low-power Flash with power-off capability): Reduced overall Run and Wait mode current consumption by turning off clocks of unused peripherals or Flash

● Sub 1 µA hardware RTC and AWU system unit: Ultralow power modes for applications requesting regular wake up

● Range of Low power modes (up to 4): Suitable for many applications from complete switch off to continuous monitoring at ultralow frequency

● Advanced and flexible clock system (multiple internal and external clock sources): Switch and adjust frequency and clock sources on the fly depending on application needs

● Direct memory access on board (4-channel DMA): Autonomy for peripherals, independent from core; can switch off Flash memory and CPU (large current consumption contributors) while keeping peripherals active

● Ultralow power and ultrasafe reset system POR/PDR; additional optional activation BOR: Integrated safety and security for application

● Ultrafast wakeup from lowest Low power mode (4 µs): Fast switching from Static and Dynamic power modes

● Analog functional down to 1.8 V, programming down to 1.65 V: Full functionality over the complete VDD range

For more information see the STM8L152C6T6 datasheet (Doc ID 15962) on the ST website.

The STM8L152C6T6 8-bit microcontroller offers:

2 Kbytes RAM32 Kbytes of Flash memory

LQFP48 7 x 7 mm

1 Kbytes EEPROM


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Figure 6. STM8L152C6T6 block diagram


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3.2 Embedded ST-Link The ST-Link programming and debugging tool is integrated on the STM8L-DISCOVERY. The embedded ST-Link can be used in 2 different ways according to the jumper states (see Table 2):

● to program/debug the MCU on board,

● to program/debug an MCU in an external application board using a cable connected to SWIM connector CN2.

For information about debugging and programming features refer to ST-Link UM0627.

Note: UM0627 contains information about all the ST-Link features. Usage in this situation is restricted to STM8 devices and SWIM support.

Figure 7. Typical configuration

Table 2. Jumper states

Jumper state Description

Both CN3 jumpers ON ST-Link functions enabled for on board programming (default)

Both CN3 jumpers OFF ST-Link functions enabled for external application through CN2 connector (SWIM supported).

Hardware requirements:- USB cable type A to mini-B- Computer with Windows 2000, XP or Vista OS

Development toolchain:- IAR, Embedded Workbench® for STM8L- STMicroelectronics, ST Visual Develop (STVD)


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3.2.1 Using the ST-Link to program/debug the STM8L on board

To program the STM8L on board, simply plug in the two jumpers on CN3, as shown in Figure 8 in red, but do not use the CN2 connector as that could disturb communication with the STM8L152C6T6 of the STM8L-DISCOVERY.

Figure 8. STM8L-DISCOVERY connections image

3.2.2 Using the ST-Link to program/debug an external STM8L application

It is very easy to use the ST-Link to program the STM8L on an external application. Simply remove the 2 jumpers from CN3 as shown in Figure 9, and connect your application to the CN2 debug connector according to Table 3.

Jumpers on CN3

Table 3. Debug connector CN2 (SWIM)

Pin CN2 Designation

1 VDD_TARGET VDD from application

2 SWIM SWIM data input/output

3 GND Ground

4 SWIM_RST SWIM reset


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Figure 9. ST-Link connections image

3.3 Power supply and power selectionThe power supply is provided either by the host PC through the USB cable, or by external power supply (5 V or 3.3 V). The D1 and D2 protection diodes allow the 5V and 3V3 pins to be used independently as input or output power supplies (see Figure 3). The 5V and 3V3 pins can be used as an output power supply for use by an application board connected on pin headers (P1 to P3). In such a case, the 3V3 pin provides only a 3V power supply and the power consumption must be lower than 100 mA. The 5V and 3V3 pins can also be used as an input power supply for the board when the USB connector is not connected to the PC.

Note: If an external power supply is used, it must conform to EN 60950-1 SELV (safety extra low voltage) LPS (limited power source) definitions.

If the 5V and 3V3 pins are used as an input power supply, the STM8L-DISCOVERY board must be powered by a power supply unit or auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009, and must be safety extra low voltage (SELV) with limited power capability.

3.4 LEDs● LD1 COM: Red LED indicates communication in progress between PC and ST-Link.

● LD2 PWR: Red LED indicates that the board is powered.

● LD3 PE7: Green LED is a user LED connected to the I/O PE7 of the STM8L152C6T6.

● LD4 PC7: Blue LED is a user LED connected to the I/O PC7 of the STM8L152C6T6.

3.5 Push buttons● B1 RST: Push button is used to RESET the STM8L152C6T6.

● B2 USER: User push button connected to the I/O PC1 of the STM8L152C6T6.

No jumpers on CN3


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3.6 Built-in IDD measurement circuitThe STM8L-DISCOVERY built-in IDD measurement circuit allows the consumption of the STM8L152C6T6 to be measured and displayed on the LCD Glass while the MCU is in Run or Low power saving modes.

● JP1 in ON position: STM8L152C6T6 is powered through IDD measurement circuit (default).

● JP1 in OFF position: STM8L152C6T6 is powered directly by +3V3, IDD measurement circuit is bypassed.

Note: When jumper JP1 is removed the current consumption of the STM8L152C6T6 can be measured by connecting an ammeter between jumper JP1 pin 1 and pin 2.

For IDD measurement by the MCU itself, the circuit below is implemented on the STM8L-DISCOVERY. Solder bridges SB11, SB12 and SB14 must be closed and a jumper must be plugged between JP1 pin 2 and pin 3.

Figure 10. STM8L-DISCOVERY IDD measurement circuit

3.6.1 Run mode

In Run mode, IDD current is measured using the operational amplifier MAX9938FEUK+ (U4) connected to the 2 Ω shunt resistor (R20). In this case IDD_CNT_EN remains high during measurement, so R21 remains in short-circuit during the measurement because of transistor T1 which remains ON permanently. The jumper JP1 must be connected between pins 2 and 3 of JP1. The measurement range in this case can be up to 30 mA.

3.6.2 Low power mode

In Low power modes (Halt or Active halt), IDD current is measured using the operational amplifier MAX9938FEUK+ (U4) connected to the 2KΩ shunt resistor (R21), controlled by the analogue switch STT5PF20V (T1). In this case the counter 74HC4060 (U3) enabled by IDD_CNT_EN manages the measurement timing according to Figure 11. The measurement range in this case can be up to 30 µA.

R1947K

IDD_Measurement

IDD_CNT_EN

IDD_WAKEUP

2

3

4

5

U774LX1G04CTR

I/O1 O/I 2

GND3C4

VCC 5

U6

74H1G66STR+3V3R20

2(1%)

R21

2K(1%)

3

4 5

G

S D

1 2 6

T1STT5PF20V

3

4

5G

SD 1

26

T2

STT5PF20V

+3V3

Q121

Q132

Q143

Q64

Q55

Q76

Q47

GND8 CO 9CO 10CI 11

CLR 12Q9 13Q8 14

Q10 15VCC 16

U3

M74HC4060TTR

+3V3+3V3

R2610K

R18

10K C111uF +3V3

VDD_MCU

12

3 JP1

C131nF

R2215K

R2330K

Oscillator frequency 30KHz

+3V3

R17

0

PF0

PE6

PC4

C12100nF

4

5

2

3

1 U4MAX9938FEUK+

SB11

SB12

SB14

IDD

onoff


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3.6.3 Low power mode IDD measurement principle

The principle used to measure a current when the STM8L152C6T6 is in Low power mode is:

1. Configure ADC to measure voltage on the IDD_Measurement pin.

2. Configure PE6 to serve as wakeup pin.

3. Enter Low power mode after setting IDD_CNT_EN (PC4) signal low.

4. IDD_WAKEUP rising edge wakes up the MCU after around 300 ms.

5. Start ADC conversion as soon as possible after wakeup in order to measure the voltage corresponding to Low power mode on capacitor C11.

6. Reset the counter by programming IDD_CNT_EN high (in less than 70 ms after the wakeup) to avoid the R21 2 KΩ resistor being connected later in Run mode.

The measurement timing is given in Figure 11. In Low power modes, the 2 KΩ resistor is connected when T1 goes off after entering Low power mode. Q13 output of the counter allows connection of the 2 KΩ resistor when the current IDD becomes very low.

Figure 11 shows how the counter and T1 ensure that, 150 ms after IDD_CNT_EN falling edge, the shunt resistor R21 is connected between VDD_MCU and the power supply in order to reduce the measurement range to 30 uA full scale (instead of 30 mA in Run mode). Then after another 150 ms for current stabilization, R21 is shorted, the IDD measurement is stored in C11, and the MCU is woken up. After wakeup the MCU can measure the IDD current corresponding to the Low power mode stored in C11.

Figure 11. STM8L-DISCOVERY IDD Low power mode measurement timing diagram


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3.6.4 Ibias current measurement procedure

In Low power mode the bias current of operational amplifier input (U4 pin 4) is not negligible compared to IDD current (typical Ibias is ~240 nA). To obtain a reliable STM8L152 IDD measurement it is mandatory to subtract the bias current from the IDD low power measurement since this current is not sinked by the MCU. Ibias is measured during production test and stored in the MCU EPROM. The demonstration software, Discover, uses this value to display the correct IDD. The Ibias measurement procedure is part of the demonstration software and can be launched if required.

The procedure for Ibias measurement (implemented in the Demo) is:

1. Power off the board (disconnect the USB cable).

2. Set jumper JP1 to OFF position (pins 1 and 2).

3. Push down B2 (USER button), power on the board from the USB.

4. Wait at least 1 second before releasing B2, the LCD displays the Ibias measurement.

5. Power off the board (disconnect the USB cable).

6. Set jumper JP1 to ON position (pins 2 and 3). The Ibias value is now stored. The bias current is then subtracted from the IDD measurement performed in Low power mode.

3.7 Solder bridgesTable 4. Solder bridge

Bridge State(1)

1. Default state is in bold type.

Description

SB1,2(X2 crystal)

Off PA2, PA3 are disconnected from P1 X2, C19, C20 and R24 provide a clock as shown in schematics

On PA2, PA3 are connected to P1 (X2, C19, C20, R24 must not be fitted)

SB3,5,7,9 (DEFAULT)

On Reserved, do not modify

SB4,6,8,10(PRG-32)

Off Reserved, do not modify

SB11,12,14(IDD_Measurement)

Off PFO, PE6, PC4 are available and IDD module cannot be usedJP1 must be set to OFF

On PFO, PE6, PC4 are used by IDD moduleJP1 must be set to ON

SB13,15(X3 crystal)

Off PC5, PC6 are only connected to P2 (but do not remove X3, C21, C23, R27)

On PC5, PC6 are connected to P2. X3, C21, C23 and R27 provide 32 KHz clock

SB16(B1-RESET)

Off PA1/RESET signal is only connected to P1

On PA1/RESET signal is used by ST_LINK as SWIM_RST and also connected to P1

SB17(B2-USER)

Off PC1 is only connected to P2

On PC1 is connected to P2 and push button B2 for user


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3.8 LCD (24 segments, 4 commons)This LCD allows the STM8L152C6T6 to display any information on six 14-segment digits and 4 BARs, using all COMs. (See the LCD segment mapping in Figure 12 and pin connections in Table 5.)

Note: This LCD also supports six 8-segment digits by only using COM0 and COM1. This configuration allows COM2 and COM3 to be used as I/O ports. In this case the 2 LCD pins must not be plugged into the LCD socket. To proceed with this configuration, remove the LCD carefully, slightly open the COM2 and COM3 pins (pin 13 and pin 14) of the LCD, then replug it in the socket.

Characteristics overview:

● 24 segments and 4 commons

● Drive method: multiplexed 1/4 duty, 1/3 bias

● Operating voltage: 3 V

● Operating temperature: 0 to 50°C

● Connector: 28-pin DIL 2.54 mm pitch

Note: When the LCD is plugged, all I/O ports listed in Table 5 are unavailable. To use one of these as I/O, you must remove the LCD.

Figure 12. LCD segment mapping


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Table 5. LCD connections

STM8L152C6T6 LCD

Pin name Pin COM3 COM2 COM1 COM0

PA7_LCDSEG0 1 1N 1P 1D 1E

PE0_LCDSEG1 2 1DP 1COLON 1C 1M

PE1_LCDSEG2 3 2N 2P 2D 2E





PD0_LCDSEG7 8 4DP 4COLON 4C 4M

PD2_LCDSEG8 9 5N 5P 5D 5E

PD3_LCDSEG9 10 BAR2 BAR3 5C 5M

PB0_LCDSEG10 11 6N 6P 6D 6E

PB1_LCDSEG11 12 BAR0 BAR1 6C 6M

PD1_LCDCOM3 13 COM3

PA6_LCDCOM2 14 COM2

PA5_LCDCOM1 15 COM1

PA4_LCDCOM0 16 COM0

PB2_LCDSEG12 17 6J 6K 6A 6B

PB3_LCDSEG13 18 6H 6Q 6F 6G





PD4_LCDSEG18 23 3J 3K 3A 3B

PD5_LCDSEG19 24 3H 3Q 3F 3G

PD6_LCDSEG20 25 2J 2K 2A 2B

PD7_LCDSEG21 26 2H 2Q 2F 2G

PC2_LCDSEG22 27 1J 1K 1A 1B

PC3_LCDSEG23 28 1H 1Q 1F 1G

Extension connection UM0970

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4 Extension connection

Male headers P1, P2 and P3 can connect the STM8L-DISCOVERY to a standard prototyping/wrapping board. All GPI/Os of STM8L152C6T6 are available on it.P1, P2 and P3 can also be probed by an oscilloscope, logical analyzer or voltmeter.

Table 6. P1 pinout

Pin number(P1)

Pin number(STM8L)

Board pin name Ty

pe Main

functionAlternate function LCD (U5)

1 +3V3

3.3 V board power supplied or supply external application when USB connected

2 1 PA0 I/O Port A0 PA0/[USART1_CK](3)/ SWIM/BEEP/IR_TIM (7)

3 9/40 GND Ground

4 2 PA1 I/O Reset NRST/PA1(1)

5 3 PA2 I/O Port A2 PA2/OSC_IN/[USART1_TX](3)/[SPI1_MISO] (3)

6 4 PA3 I/O Port A3 PA3/OSC_OUT/[USART1 _RX](3)/[SPI1_MOSI](3)

7 5 PA4 I/O Port A4

PA4/TIM2_BKIN/ LCD_COM0(2)/ADC1_IN2/COMP1_INP

LCD_COM0

8 6 PA5 I/O Port A5

PA5/TIM3_BKIN/ LCD_COM1(2)/ADC1_IN1/COMP1_INP

LCD_COM1

9 7 PA6 I/O Port A6

PA6/[ADC1_TRIG](3)/LCD_COM2(2)/ADC1_IN0/ COMP1_INP

LCD_COM2

10 8 PA7 I/O Port A7 PA7/LCD_SEG0(2)(4)

LCD_SEG0

11 14 PE0 I/O Port E0 PE0(4)/LCD_SEG1(2)

LCD_SEG1

12 15 PE1 I/O Port E1 PE1/TIM1_CH2N / LCD_SEG2(2)

LCD_SEG2

13 16 PE2 I/O Port E2 PE2/TIM1_CH3N / LCD_SEG3(2)

LCD_SEG3

14 17 PE3 I/O Port E3 PE3/LCD_SEG4(2) LCD_SEG4

15 18 PE4 I/O Port E4 PE4/LCD_SEG5(2) LCD_SEG5

UM0970 Extension connection

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16 19 PE5 I/O Port E5

PE5/LCD_SEG6(2)/ ADC1_IN23/ COMP2_INP/ COMP1_INP

LCD_SEG6

17 20 PD0 I/O Port D0

PD0/TIM3_CH2/ [ADC1_TRIG](3)/ LCD_SEG7(2)/ADC1_IN2 2/COMP2_INP/ COMP1_INP

LCD_SEG7


PD1/TIM3_TRIG/ LCD_COM3(2)/ ADC1_IN21/COMP2_INP/ COMP1_INP

LCD_COM3

19 9/40 GND Ground

Table 7. P2 pinout

Pin number(P2)

Pin number(STM8L)

Pin name

Typ

e Main function

Alternate function LCD (U5)

1 +5V

5 Volts board power supplied or supply external application when USB connected

2 NC

3 9/40 GND Ground

4 48 PE7 I/O Port E7 PE7/LCD_SEG27(2)

5 47 PE6 I/O Port E6 PE6/LCD_SEG26(2)/ PVD_IN

6 46 PC7 I/O Port C7

PC7/LCD_SEG25(2)/ ADC1_IN3/COMP2_INM/ COMP1_INP

7 45 PC6 I/O Port C6 PC6/OSC32_OUT/ [SPI1_SCK](3)/ [USART1_RX](3)

8 44 PC5 I/O Port C5 PC5/OSC32_IN /[SPI1_NSS](3)/ [USART1_TX](3)


PC4/[USART1_CK](3)/ I2C1_SMB/CCO/ LCD_SEG24(2)/ ADC1_IN4/COMP2_INM/ COMP1_INP

Table 6. P1 pinout (continued)

Pin number(P1)

Pin number(STM8L)

Board pin name Ty

pe Main

functionAlternate function LCD (U5)

UM0970 Extension connection

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PC3/[USART1_TX](3)/ LCD_SEG23(2)/ ADC1_IN5/COMP1_INP/ COMP2_INM

LCD_SEG23


PC2/[USART1_RX](3)/ LCD_SEG22/ADC1_IN6/ COMP1_INP/VREF_OUT

LCD_SEG22

12 38 PC1 I/O Port C1 PC1(4)/I2C1_SCL

13 37 PC0 I/O Port C0 PC0(4)/I2C1_SDA


PD7/TIM1_CH1N /LCD_SEG21(2)/ ADC1_IN7/RTC_ALARM/ VREF_OUT/ COMP1_INP

LCD_SEG21


PD6/TIM1_BKIN /LCD_SEG20(2)/ ADC1_IN8/RTC_CALIB/ VREF_OUT/ COMP1_INP

LCD_SEG20


PD5/TIM1_CH3 /LCD_SEG19(2)/ ADC1_IN9/COMP1_INP

LCD_SEG19



LCD_SEG18

18 32 PF0 I/O Port F0 PF0/ADC1_IN24/ DAC_OUT

19 9/40 GND Ground

Table 7. P2 pinout (continued)

Pin number(P2)

Pin number(STM8L)

Pin name

Typ

e Main function


Extension connection UM0970

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Table 8. P3 pinout

Pin number(P3)

Pin number(STM8L)

Pin name

Typ

e Main function




LCD_SEG8


PD3/ TIM1_TRIG/ LCD_SEG9(2)/ADC1_IN1 9/COMP1_INP

LCD_SEG9

3 24 PB0 I/O Port B0

PB0/TIM2_CH1/ LCD_SEG10(2)/ ADC1_IN18/COMP1_INP

LCD_SEG10


PB1/TIM3_CH1/ LCD_SEG11(2)/ ADC1_IN17/COMP1_INP

LCD_SEG11


PB2/ TIM2_CH2/ LCD_SEG12(2)/ ADC1_IN16/COMP1_INP

LCD_SEG12


PB3/TIM2_TRIG/ LCD_SEG13(2)/ ADC1_IN15/COMP1_INP

LCD_SEG13


PB4/[SPI1_NSS](3)/ LCD_SEG14(2)/ ADC1_IN14/COMP1_INP

LCD_SEG14


PB5/[SPI1_SCK](3)/ LCD_SEG15(2)/ ADC1_IN13/COMP1_INP

LCD_SEG15


PB6/[SPI1_MOSI](3)/ LCD_SEG16(2)/ ADC1_IN12/COMP1_INP

LCD_SEG16


PB7/[SPI1_MISO](3)/ LCD_SEG17(2)/ ADC1_IN11/COMP1_INP

LCD_SEG17

Mechanical drawing UM0970

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5 Mechanical drawing

Figure 13. STM8L-DISCOVERY

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6 Electrical schematics

Figure 14. STM8L-DISCOVERY

STMicroelectronicsTitle:

Number: Rev: Sheet ofB.2(PCB.SCH) Date:7/15/2010MB913 1 5

STM8L-DISCOVERY

PC3_LCDSEG23PC2_LCDSEG22PD7_LCDSEG21PD6_LCDSEG20PD5_LCDSEG19PD4_LCDSEG18PB7_LCDSEG17PB6_LCDSEG16PB5_LCDSEG15PB4_LCDSEG14PB3_LCDSEG13PB2_LCDSEG12PB1_LCDSEG11PB0_LCDSEG10PD3_LCDSEG9PD2_LCDSEG8PD0_LCDSEG7PE5_LCDSEG6PE4_LCDSEG5PE3_LCDSEG4PE2_LCDSEG3PE1_LCDSEG2PE0_LCDSEG1PA7_LCDSEG0

PA6_LCDCOM2PA5_LCDCOM1PA4_LCDCOM0

PD1_LCDCOM3

PD[0..7]PE[0..7]PF0

RESET#ST_LINK_SWIM

PC[0..7]PB[0..7]PA[0..7]

IDD_CNT_ENIDD_MeasurementIDD_WAKEUP

U_MCUMCU.SchDoc

RESET#ST_LINK_SWIM

EXT_5VEXT_3V3

U_ST_LINKST_LINK.SCHDOC

PA4PA5PA6PA7

PA0

PA3PA2

RESET#

EXT_5V

EXT_3V3

IDD_MeasurementIDD_CNT_EN

ST_LINK_SWIM

PB[0..7]PC[0..7]PD[0..7]

IDD_WAKEUP

PF0PE[0..7]

PA[0..7] PC3_LCDSEG23PC2_LCDSEG22PD7_LCDSEG21PD6_LCDSEG20PD5_LCDSEG19PD4_LCDSEG18PB7_LCDSEG17PB6_LCDSEG16PB5_LCDSEG15PB4_LCDSEG14PB3_LCDSEG13PB2_LCDSEG12PB1_LCDSEG11PB0_LCDSEG10

PD2_LCDSEG8PD3_LCDSEG9

PD0_LCDSEG7

PA7_LCDSEG0PE0_LCDSEG1PE1_LCDSEG2PE2_LCDSEG3PE3_LCDSEG4PE4_LCDSEG5PE5_LCDSEG6

PA4_LCDCOM0PA5_LCDCOM1PA6_LCDCOM2PD1_LCDCOM3

U_PowerGH08172_buttons.SchDoc

IDD_MeasurementIDD_CNT_EN

IDD_WAKEUP

U_PowerIDD_measurement.SchDoc

123456789

10

P3

Header 10

123456789

10111213141516171819

P1

Header 19

12345678910111213141516171819

P2

Header 19

RESET#ST_LINK_SWIMIDD_Measurement

IDD_CNT_EN

IDD_WAKEUP EXT_5VEXT_3V3

PA1

PE0PE1PE2PE3PE4PE5PD0PD1 PD2

PD3PB0PB1PB2PB3PB4PB5PB6PB7

PF0PD4PD5PD6PD7PC0PC1PC2PC3PC4PC5PC6PC7PE6PE7

RST

Electrical sch

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Figure 15. LCD


Number: Rev: Sheet ofB.2(SCH.PCB) Date:7/15/2010MB915 2 5

STM8L-DISCOVERY LCD

LCD

11

22

33

44

55

66

77

88

99

1010

1111

1212

COM3

13

COM2

14COM1

15

COM0

16

1717

1818

1919

2020

2121

2222

2323

2424

2525

2626

2727

2828

U5GH08172T

PB3_LCDSEG13PB2_LCDSEG12

PB1_LCDSEG11

PB6_LCDSEG16PB5_LCDSEG15

PB4_LCDSEG14

PC3_LCDSEG23PC2_LCDSEG22


PB7_LCDSEG17


PA4_LCDCOM0PA5_LCDCOM1

PA6_LCDCOM2PA7_LCDSEG0PE0_LCDSEG1

PE1_LCDSEG2PE2_LCDSEG3

PE3_LCDSEG4PE4_LCDSEG5

PE5_LCDSEG6 PD0_LCDSEG7

PD1_LCDCOM3


PB0_LCDSEG10

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Figure 16. IDD measurement


Number: Rev: Sheet B.2(SCH.PCB) Date:7/15/2010MB915 3

STM8L-DISCOVERY IDD_Measurement

R1947K

IDD_Measurement

IDD_CNT_EN

IDD_WAKEUP

2

3

4

5

U774LX1G04CTR

I/O1 O/I 2

GND3C4

VCC 5

U6

74H1G66STR+3V3R20

2(1%)

R21

2K(1%)

3

4 5

G

S D

1 2 6

T1STT5PF20V

3

4

5G

SD 1

26

T2

STT5PF20V

+3V3

Q121

Q132

Q143

Q64

Q55

Q76

Q47

GND8 CO 9CO 10CI 11

CLR 12Q9 13Q8 14

Q10 15VCC 16

U3

M74HC4060TTR

+3V3+3V3

R2610K

R18

10K C111uF +3V3

VDD_MCU

12

3 JP1

C131nF

R2215K

R2330K

Oscillator frequency 30KHz

+3V3

R17

0

PF0

PE6

PC4

C12100nF

4

5

2

3

1 U4MAX9938FEUK+

SB11

SB12

SB14

IDD

onoff

Electrical sch

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Figure 17. STM8L MCU

SWIM

LEDSTMicroelectronicsTitle:

Number: Rev: Sheet ofB.2(PCB.SCH) Date:7/15/2010MB915 4 5

STM8L-DISCOVERY MCU

LD3

green

R28

330

LD4

blue

R29

660

PA4_LCDCOM0

1 432

B1RESET (Black) C24

100nF

RESET#

C19

20pF

C20

20pFX216MHz

R24

60

41

32

X3

MC306-G-06Q-32.768 (manufacturer JFVNY)

C216.8pF

C236.8pF

VDD_MCUVDDA

VDD_MCU

PA0PA1

PA2

PA3PA4PA5PA6PA7

PE0PE1PE2PE3PE4PE5PD0PD1PD2PD3PB0 PB1

PB2PB3PB4PB5PB6PB7PF0PD4PD5PD6PD7PC0PC1

PC2PC3PC4PC5PC6PC7PE6PE7

C16100nF

VDD_MCU

C17100nF

L1

BEAD C141uF

C15100nF

VDDA

PA5_LCDCOM1PA6_LCDCOM2PA7_LCDSEG0

PE0_LCDSEG1PE1_LCDSEG2PE2_LCDSEG3PE3_LCDSEG4PE4_LCDSEG5PE5_LCDSEG6PD0_LCDSEG7PD1_LCDCOM3PD2_LCDSEG8PD3_LCDSEG9PB0_LCDSEG10

PB3_LCDSEG13PB2_LCDSEG12PB1_LCDSEG11

PB6_LCDSEG16PB5_LCDSEG15PB4_LCDSEG14

PC3_LCDSEG23PC2_LCDSEG22


PB7_LCDSEG17


PA[0..7] PA[0..7]

PE[0..7] PE[0..7]

PD[0..7] PD[0..7]

PB[0..7] PB[0..7]

PF0 PF0

PC[0..7] PC[0..7]

C221uF

C181uF

PA01

PA12

PA23

PA34

PA45

PA56

PA67

PA78

AVSS9

VDD10

VDDA11

VREF+12

VLCD13

PE014

PE115

PE216

PE317

PE418

PE519

PD020

PD121

PD222

PD323

PB024 PB1 25PB2 26PB3 27PB4 28PB5 29PB6 30PB7 31PF0 32PD4 33PD5 34PD6 35PD7 36PC0 37PC1 38

VDDIO 39VSSIO 40

PC2 41PC3 42PC4 43PC5 44PC6 45PC7 46PE6 47PE7 48

U8

STM8L152C6T6

RESET#

ST_LINK_SWIM

IDD_Measurement

PE7

PC7

IDD_WAKEUP

IDD_CNT_EN

R25

0VDD_MCU

User Button

1 432

B2USER (Blue) C25

100nF

SB2

SB1

SB16

SB17

Not Fitted

Must be close to the Crystal and ON

SB13SB15

R270 Must be close to the Crystal and ON

RESET

R304K7

+3V3

User_PB

Not Fitted

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Figure 18. ST-Link (SWIM only)


Number: Rev: Sheet ofB.2(PCB.SCH) Date:7/15/2010

VBAT1

PC132

PC143

PC154

OSC_IN5

OSC_OUT6

/RST7

VSSA8

VDDA9

PA010

PA111

U2_TX12U2_

RX

13

U2_

CK

14

S1_C

K15

S1_M

ISO

16

S1_M

OSI

17

PB0

18

PB1

19

PB2/BOOT1

20

PB10

21

VSS

_123

VDD_1

24

PB12 25

PB11

22

S2_CK 26S2_MISO 27S2_MOSI 28

PA8 29PA9 30

PA10 31PA11 32PA12 33JTMS 34VSS_2 35VDD_2 36

JTCK

37JT

DI

38JT

DO

39JN

RST

40PB

541

PB6

42PB

743

BOOT0

44PB

845

PB9

46VSS

_347

VDD_3

48

U2STM32F103C8T6C8

20pFC920pF 1 2

X1

8MHz+3V3

U2_TXU2_

RX

U2_

CK

M25_CS

USB_DMUSB_DP

STM_RST

T_JT

CK

T_JTCK

T_JT

DO

T_JT

DI

T_JTMS

STM_JTMS

STM

_JTC

KSTM

_JTD

ISTM

_JTD

OSTM

_JRST

OSC_INOSC_OUT

U1_TXU1_RX

T_NRST

T_JR

ST

LD1

RED

ST_LINK_LED

R154K7

R164K7

AIN_1C10100nF

R14

100K

R8

510

R9

100K

+3V3

+3V3

+3V3

+3V3

+3V3

SWIM

SWIM_RST

SWIM_IN

SWIM_RST_IN

SW

IM_IN

SW

IM_IN

SWIM

_IN

SW

IM

SWIM

SW

IM_R

ST_

INSW

IM_R

ST

RESET#ST_LINK_SWIM

MB915 5 5

STM8L-DISCOVERY ST-LINK (SWIM only)

R7

220

R12

220

SWIM_PULLUP_CTL

ST_LINK_LED

+3V3

R6

47

R13

47

R10680

1234

CN2

USB_DMUSB_DP

+3V3

R31K5

R5

22R4

22

USB

R2100K

VCC 1

D- 2

D+ 3

ID 4

GND 5

SHELL 0

CN1

5075BMR-05-SM

U5V

1 2 3 4

CN3

SB4 SB3

COM

SB6 SB5

SB8 SB7

SB10 SB9STM_JTMS

STM_JTCK

R1110K

+3V3

+5V

U5V

EXT_5V D2

BAT60JFILM

+3V3 EXT_3V3

D1BAT60JFILM

R1

1K

PWR

LD2

RED

+3V3

SWCLK

SWDIO

Vin3 Vout 2

1

U1LD1117S33TR

C310uF

C110uF

+5V

JP3

Wired on Solder Side

JP2

C6100nF

C7100nF

C4100nF

C5100nF

SWIM DISCOVERYST-LINK

PRG-32

DEFAULT

+3V3

C2100nF

Jumpers ON --> DISCOVERY SelectedJumpers OFF --> ST-LINK Selected

Revision history UM0970

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7 Revision history

Table 9. Document revision history

Date Revision Changes

24-Sep-2010 1 Initial release.

15-Jun-2011 2Section 5 Mechanical drawing added. Note added to Section 3.3, measurement range added to Section 3.6.1 and Section 3.6.2.

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Please Read Carefully:

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Figure 1. STM8L-DISCOVERY board1 Quick start1.1 Getting startedTable 1. Functions

1.2 System requirements1.3 Development toolchain1.4 Demonstration software1.5 Order code

2 Features3 Hardware and layoutFigure 2. Hardware block diagramFigure 3. Top layoutFigure 4. Bottom layout3.1 STM8L152C6T6 microcontrollerFigure 5. STM8L152C6T6 packageFigure 6. STM8L152C6T6 block diagram

3.2 Embedded ST-LinkFigure 7. Typical configurationTable 2. Jumper states3.2.1 Using the ST-Link to program/debug the STM8L on boardFigure 8. STM8L-DISCOVERY connections image

3.2.2 Using the ST-Link to program/debug an external STM8L applicationTable 3. Debug connector CN2 (SWIM)Figure 9. ST-Link connections image

3.3 Power supply and power selection3.4 LEDs3.5 Push buttons3.6 Built-in IDD measurement circuitFigure 10. STM8L-DISCOVERY IDD measurement circuit3.6.1 Run mode3.6.2 Low power mode3.6.3 Low power mode IDD measurement principleFigure 11. STM8L-DISCOVERY IDD Low power mode measurement timing diagram

3.6.4 Ibias current measurement procedure

3.7 Solder bridgesTable 4. Solder bridge

3.8 LCD (24 segments, 4 commons)Figure 12. LCD segment mappingTable 5. LCD connections

4 Extension connectionTable 6. P1 pinoutTable 7. P2 pinoutTable 8. P3 pinout

5 Mechanical drawingFigure 13. STM8L-DISCOVERY

6 Electrical schematicsFigure 14. STM8L-DISCOVERYFigure 15. LCDFigure 16. IDD measurementFigure 17. STM8L MCUFigure 18. ST-Link (SWIM only)

7 Revision historyTable 9. Document revision history

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