ST 32L100CDISCOVERY User Manual

August 2013 DocID025091 Rev 1 1/30

UM1656

User manual

32L100CDISCOVERY discovery kit

for STM32L100 Value Line microcontrollers

Introduction

The 32L100CDISCOVERY helps you to discover the features of the STM32L10 0 Value Line
32-bit ARM

®

Cortex™-M3 microcontrollers and to develop your applications easily. It is
based on STM32L100RCT6 and includes an ST-LINK/V2 embedded debug tool, LEDs, and
push buttons.

Figure 1. 32L100CDISCOVERY

www.st.com

Contents UM1656

2/30 DocID025091 Rev 1

Contents

1 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Development toolchain supporting the 32L100CDISCOVERY . . . . . . . . . 6

2.4 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 STM32L100RCT6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.2 Embedded ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2.1 Using ST-LINK/V2 to program/debug the STM32L100 Value Line

on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2.2 Using ST-LINK/V2 to program/d ebug an external STM32 application . . 15

4.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.5 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.6 JP2 (I

DD

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.7 Oscillator clock (OSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.7.1 OSC clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.7.2 OSC 32 KHz clock supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.8 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.9 Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5 Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6 Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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

DocID025091 Rev 1 3/30

UM1656 List of tables

3

List of tables

Table 1. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 3. Debug connector CN3 (SWD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4. Solder bridge settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 5. MCU pin description versus board function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 6. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

List of figures UM1656

4/30 DocID025091 Rev 1

List of figures

Figure 1. 32L100CDISCOVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 3. Top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4. Bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 5. STM32L100RCT6 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 6. STM32L100RCT6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 7. Typical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 8. 32L100CDISCOVERY connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 9. ST-LINK connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 10. 32L100CDISCOVERY mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 11. 32L100CDISCOVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 12. ST-LINK/V2 (SWD only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 13. MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

DocID025091 Rev 1 5/30

UM1656 Conventions

29

1 Conventions

Table 1 provides the definition of some conventions used in the present document.

Table 1. ON/OFF conventions

Convention Definition

Jumper JP1 ON Jumper fitted
Jumper JP1 OFF Jumper not fitted
Solder bridge SBx ON SBx connections closed by solder
Solder bridge SBx OFF SBx connections left open

Quick start UM1656

6/30 DocID025091 Rev 1

2 Quick start

The 32L100CDISCOVERY is a low-cost and easy-to-use development kit to quickly
evaluate and start development with an STM32L100 Value Line series.

Before installing and using the product, please accept the Evaluation Product License
Agreement from www.st.com/stm32l1-discovery.

For more information on the 32L100CDISCOVERY a nd for demonstration software, visit

www.st.com/stm32l1-discovery.

2.1 Getting started

Follow the sequence below to configure the 32L100CDISCOVERY board and launch the
DISCOVER application:

1. Check jumper position on the board, JP2 on, CN2 on (Discovery selected).

2. Connect the 32L100CDISCOVERY board to a PC with a USB cable ‘type A to mini-B’
through USB connector CN1 to power the board. Red LED LD1 (PWR) and LD2 (COM)
light up and green LED LD3 blinks.

3. Press user button B1 (bottom left corner of the board).

4. Observe how the green LED LD3 blinking changes according to USER button B1
clicks.

5. Each click on USER button B1 is confirmed by the blue LED LD4.

6. To study or modify the DISCOVER project related to this demo, visit

www.st.com/stm32l1-discovery and follow the tutorial.

7. Discover the STM32L100 Value Line features, download and execute programs
proposed in the list of projects.

8. Develop your own application using available examples.

2.2 System requirements

• Windows PC (XP, Vista, 7)

• USB type A to Mini-B USB cable

2.3 Development toolchain supporting the 32L100CDISCOVERY

• Altium®, TASKING™ VX-toolset

• ARM

®

, Atollic TrueSTUDIO

®

• IAR™, EWARM (IAR Embedded Workbench®)

• Keil™, MDK-ARM™

2.4 Order code

To order the STM32L100 Value Line Discovery kit, use the order code STM32L100C­DISCO.

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UM1656 Features

29

3 Features

The 32L100CDISCOVERY kit offers the following features:

• STM32L100RCT6 microcontroller featuring 256 KB Flash, 16 KB RAM in an LQFP64
package

• On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone
ST-LINK/V2 (with SWD connector for pr ogramming and debugging)

• Board power supply: through USB bus or from an external 5 V supply voltage

• External application power supply: 3 V and 5 V

• Four LEDs:

– LD1 (red) for 3.3 V power on
– LD2 (red/green) for USB communication
– LD3 (green) for PC9 output
– LD4 (blue) for PC8 output

• Two push buttons (user and reset)

• Extension header for LQFP64 I/Os for quick connection to prototyping board and easy

probing.

• An additional board is provided with the kit which can be connected to the extension
connector for even easier prototyping and probing.

• A large number of free ready-to-run application firmware examples are available on

www.st.com/stm32l1-discovery to support quick evaluation and deve l op m ent.

Hardware and layout UM1656

8/30 DocID025091 Rev 1

4 Hardware and layout

The 32L100CDISCOVERY is designed around the STM32L100RCT6 microcontroller in a
64-pin LQFP package.

Figure 2 illustrates the connections between the STM32L100RCT6 and its peripherals (ST-

LINK/V2, push button, LEDs and connectors).

Figure 3 and Figure 4 help you to locate these features on the 32L100CDISCOVERY.

Figure 2. Hardware block diagram

MS32775V1

LED

LD4, PC8

B1

USER

I/O

Embedded

ST-LINK/V2

Mini

USB

LED

LD3, PC9

B2

RST

RESET

I/OI/O

Header

Header

SWD

STM32L100RCT6

DocID025091 Rev 1 9/30

UM1656 Hardware and layout

29

Figure 3. Top layout

1. Pin 1 of CN2, CN3, P1 and P2 connectors are identified by a square.

MS32777V1

(red/green LED) LD2

COM

CN3

SWD connector

IDD measurement

ST-LINK/V2

B1 user button

B2 reset button

LD1 (red LED)
PWR

CN2
ST-LINK/DISCOVERY

selector

(green LED) LD3

LD4 (blue LED)

STM32L100RCT6

JP2

5V power supply
input/output

3V power supply

su

input/output

SB1 (VBAT)

SB3 (B1-USER)

SB4 (B2-RESET)

VLCD

GND

VDD

VDD
GND

MB1108 rev B
STM32L100C-DISCO

PH0
PH1

www.st.com/stm32l1-discovery

Hardware and layout UM1656

10/30 DocID025091 Rev 1

Figure 4. Bottom layout

SB6, SB8, SB10, SB12

MS30025V1

SB5, SB7, SB9, SB11

(RESERVED)

(DEFAULT)

SB20, SB21 (X3 crystal)

SB14, SB15 (RX, TX)

SB19 (NRST)

SB16, SB17 (X2 crystal)

SB13 (STM_RST)

SB22 (T_SWO)

SB18 (MCO)

DocID025091 Rev 1 11/30

UM1656 Hardware and layout

29

4.1 STM32L100RCT6 microcontroller

The V alue Line STM32L100RCT6 incorporates the connectivity power of the universal serial
bus (USB) with the high-performance ARM Cortex™-M3 32-bit RISC core operating at a
32 MHz frequency, a memory protection unit (MPU), high-speed embedded memories
(256 Kbytes of Flash memory and 16 Kbytes of RAM) and an extensive range of enhanced
I/Os and peripherals connected to two APB buses.

The STM32L100RCT6 device offers one 12-bit ADC, two DACs, two ultra-low-power
comparators, six general-purpose 16-bit timers and two basic timers, which can be used as
time bases.

Moreover, the STM32L100RCT6 device contains standard and advanced communication
interfaces: two I2Cs, three SPIs, two I2S, three USARTs and a USB.

It also includes a real-time clock and a set of backup registers that remain powered in
Standby mode.

Finally , the integr ated LCD controller h as a built-in LCD volt age g enerator tha t allows you to
drive up to 8 multiplexed LCDs with contrast independent of the supply voltage.

The ultra-low-power STM32L100RCT6 operates from a 1.8 to 3.6 V power supply with
BOR. It is available in the -40 to +85 °C temperature range. A comprehensive set of power­saving modes allows the design of low-power applications.

Figure 5. STM32L100RCT6 package

-36

34-,2#4

+BYTESOF&LASHMEMORY
+BYTESOF2!-

,1&0XMM

Hardware and layout UM1656

12/30 DocID025091 Rev 1

Figure 6. STM32L100RCT6 block diagram

EXT. IT
WKU P

WIn WATCH DOG

12bit ADC

JTAG & SW

20 AF

NJTRST

JTDI

JTCK/SWCLK

JTMS/SWDAT

JTDO
As AF

NRST

V

DD

= 1.8 V to 3.6 V

V

SS

51 AF

USB 2.0 FS device

USB_DP

SRAM 16K

2x(8x16bi t)

f

MAX

:32 MHz

SCL,SDA,SMBus,PMBus
as AF

GP DMA 7 channels

XTAL OSC
1-24 MHz

AHPBCLK
APBPCLK

HCLK
FCLK

EEPROM 64 bit

VOLT. REG.

V

DDC ORE

POWER

Backup interface

Bu sMatrix 5M/5S

Interface

Ibu s

Dbus

obl

EE²

USB SRAM 512B

USART1

USART2

SPI2/I2S

5 x 32-Bit

backup

reg.

SCL,SDA as AF

I2C1

RX,TX,CTS,RTS,
SmartCard as AF

Standby

WDG32K

V

DDA

/

V

SSA

RX,TX,CTS,

RTS,SmartCard

as AF

NVIC

SPI1

MOSI,MISO,

SCK,NSS

as AF

IF

interface

PVD

BOR

Int

RTC V2
AWU

Syst em

PA[15:0]

PB[15:0]

PC[15:0]

PD[15:0]

LCD 8x28 (4x32)

SEGx
COMx

12bit DAC1

FIFI

IF

DAC_OUT1 as AF

DAC_OUT2 as AF

MPU

Vref

GP Comp

BOR / Bgap

C OM Px_ IN x

PU / PD

PDR

PDR

TIMER6

1 Channel

General purpose

timers

256 KB
PROGRAM
4 KB DATA
8 KB BOOT

LCDBooster

V

LCD

PH [2:0]

RCLSI

MOSI,MISO,SCK,NSS,
WS,CK,MCK,SD as AF

2x(8x16bit)

Supply
monitoring

@V

DDA

Supply monitoring

MS32904V1

APB2: f

MAX

= 32MHz

PLL &

Clock
Mgmt

AHB/

APB2

AHB/

APB1

GPIO PORTC

GPIO PORTD

GPIO PORTH

APB1: f

MAX

= 32MHz

@V

DDA

@V

DDA

@V

DD

@V

DD

@V

DD

@V

DDA

@V

DDA

TIMER7

TIMER2

TIMER3

TIMER4

V

LCD

= 2.5 V to 3.6 V

OSC32_IN
OSC32_OUT
RTC_OUT

OSC_IN
OSC_OUT

TAMPER

4 Channels

4 Channels

4 Channels

M3 CPU

GPIO PORTA

GPIO PORTB

AHB: f

MAX

= 32MHz

GP DMA2 5 channels

MOSI,MISO,SCK,NSS,
WS,CK,MCK,SD as AF

RX,TX,CTS,RTS,
SmartCard as AF

RCMSI

RCHSI

1 Channel

2 Channels

XTAL 32kHz

12bit DAC2

USB_DM

USART3

SPI3/I2S

I2C2

TIMER9

TIMER10

TIMER11

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UM1656 Hardware and layout

29

4.2 Embedded ST-LINK/V2

The ST-LINK/V2 programming and debugging tool is integrated on the
32L100CDISCOVERY. The embedded ST-LINK/V2 can be used in 2 different ways
according to the jumper states (see Table 2):

• Program/debug the MCU on board,

• Program/debug an MCU in an external ap plication board using a cable connected to

SWD connector CN3.

The embedded ST-LINK/V2 supports only SWD for STM32 devices. 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.

Figure 7. Typical configuration

Table 2. Jumper states

Jumper state Description

Both CN2 jumpers ON ST-LINK/V2 functions enabled for on board programming (default)

Both CN2 jumpers OFF

ST-LINK/V2 functions enabled for application through external CN3
connector (SWD supported)

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Hardware and layout UM1656

14/30 DocID025091 Rev 1

4.2.1 Using ST-LINK/V2 to program/debug the STM32L100 Value Line
on board

To program the STM32L100 Value Line microcontroller on board, simply plug in the two
jumpers on CN2, as shown in Figure 8 in red, but do not use the CN3 connector as that
could disturb communication with the STM32L100RCT6 of the 32L100CDISCOVERY.

Figure 8. 32L100CDISCOVERY connections

-36

CN2 jumpers ON

CN3

SWD connector

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UM1656 Hardware and layout

29

4.2.2 Using ST-LINK/V2 to program/debug an external STM32 application

It is very easy to use the ST-LINK/V2 to program the STM32 on an external application.
Simply remove the 2 jumpers from CN2 as shown in Figure 9, and connect your application
to the CN3 debug connector according to Table 3.

Note: SB19 and SB22 must be OFF if you use CN3 pin 5 in your external application.

Figure 9. ST-LINK connections

T able 3. Debug connector CN3 (SWD)

Pin CN3 Designation

1 VDD_TARGET VDD from application
2 SWCLK SWD clock
3 GND Ground
4 SWDIO SWD data input/output
5 NRST RESET of target MCU
6 SWO Reserved

-36

CN2 jumpers OFF

CN3

SWD connector

Hardware and layout UM1656

16/30 DocID025091 Rev 1

4.3 Power supply and power selection

The power supply is provided either by the host PC through the USB cable, or by an
external 5V power supply.

The D1 and D2 diodes protect the 5V and 3V pins from external power supplies:

• 5V and 3V can be use d as output power supplies when another application board is

connected to pins P1 and P2.
In this case, the 5V and 3V pins deliver a 5V or 3V power supply and power
consumption must be lower than 100 mA.

• 5V can also be used as input power supplie s e.g. whe n the USB connector is not

connected to the PC.
In this case, the 32L100CDISCOVERY board must be powered by a power supply unit

or by auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009, and
must be Safety Extra Low Voltage (SELV) with limited power capability.

4.4 LEDs

• LD1 PWR: Red LED indicates that the board is powered.

• LD2 COM: Tricolor LED (COM) advises on the communication status as follows:

– Slow blinking Red LED/Off: At power on before USB initialization
– Fast blinking Red LED/Off: After the first correct communication between PC and

STLINK/V2 (enumeration)

– Red LED On: When initialization between PC and ST-LINK/V2 is successfully

finished
– Green LED On: After successful target communication initialization
– Blinking Red/Green LED: During communication with target
– Red LED On: Communication finished and OK
– Orange LED On: Communication failure

• User LD3: Green user LED connected to the I/O PC9 of the STM32L100RCT6.

• User LD4: Blue user LED connected to the I/O PC8 of the STM32L100RCT6.

4.5 Push buttons

• B1 USER: User push button conne cted to the I/O PA0 of the STM32L100RCT6.

• B2 RESET: Push button used to RESET the STM32L100RCT6.

4.6 JP2 (IDD)

Jumper JP2, labeled IDD, allows the consumption of STM32L100RCT6 to be measured by
removing the jumper and connecting an ammeter.

• Jumper on: STM32L100RCT6 is powered (default).

• Jumper of f: an ammeter must be co nnected to measure the STM3 2L100RCT6 current,

(if there is no ammeter, the STM32L100RCT6 is not powered).

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UM1656 Hardware and layout

29

4.7 Oscillator clock (OSC)

4.7.1 OSC clock supply

PH0 and PH1 can be used as GPIO or as HSE oscillator. By default these I/Os are
configured as GPIO, so SB16 and SB17 are closed, SB18 is open and R22, R23, C13 and
C14 are not populated.

An external HSE clock can be provided to the MCU in three ways:

• MCO from ST-LINK. From MCO of the STM32F103. This frequency cannot be
changed, it is fixed at 8 MHz and connected to PH0-OSC_IN of the STM32L100RCT6.
Configuration needed:

– SB16, SB18 CLOSED
– R22, R23 removed
– SB17 OPEN

• Oscillator onboard. From X2 crystal (not provided). For typical frequencies and its
capacitors and resistors, please refer to the STM32L100RCT6 Datasheet.
Configuration needed:

– SB16, SB17 SB18 OPEN
– R22, R23, C13, C14 soldered

• Oscillator from external PH0. From external oscillator through pin 7 of the P1
connector. Configuration needed:

– SB16, SB17 CLOSED
– SB18 OPEN
– R22 and R23 removed

4.7.2 OSC 32 KHz clock supply

PC14 and PC15 can be used as GPIO or as LSE oscillator. By default these I/Os are
configured as GPIO, so SB20 & SB21 are closed and X3, R24, R25 are not populated.

An external LSE clock can be provided to the MCU in two ways:

• Oscillator onboard. From X3 crystal (not provided). Configuration needed:
– SB20, SB21 OPEN
– C15, C16, R24 and R25 soldered.

• Oscillator from external PC14. From external oscillator trough the pin 5 of P1
connector. Configuration needed:

– SB20, SB21 CLOSED
– R24 and R25 removed

Hardware and layout UM1656

18/30 DocID025091 Rev 1

4.8 Solder bridges

Table 4. Solder bridge settings

Bridge State

(1)

Description

SB16,17
(X2 crystal)

(2)

OFF

X2, C13, C14, R22 and R23 provide a clock. PH0, PH1 are disconnected
from P1.

ON PH0, PH1 are connected to P1 (R22, R23 and SB18 must not be fitted).
SB6,8,10,12 (Default) ON Reserved, do not modify.
SB5,7,9,11 (Reserved) OFF Reserved, do not modify.

SB20,21
(X3 crystal)

OFF

X3, C15, C16, R24 and R25 deliver a 32 KHz clock. PC14, PC15 are not
connected to P1.

ON PC14, PC15 are only connected to P1 (R24, R25 must not be fitted).

SB4
(B2-RESET)

ON

B2 push button is connected to the NRST pin of the STM32L100RCT6
MCU.

OFF

B2 push button is not connected the NRST pin of the STM32L100RCT6
MCU.

SB3
(B1-USER)

ON B1 push button is connected to PA0.

OFF B1 push button is not connected to PA0.
SB1

(VBAT powered from VDD)

ON VBAT is permanently powered from VDD.

OFF VBAT is not powered from VDD but pin3 of P1.
SB14,15

(RX,TX)

OFF Reserved, do not modify.

ON Reserved, do not modify.

SB19
(NRST)

ON

NRST signal of the CN3 connector is connected to the NRST pin of the
STM32L100RCT6 MCU.

OFF

NRST signal of the CN3 connector is not connected to the NRST pin of the
STM32L100RCT6 MCU.

SB22
(T_SWO)

ON SWO signal of the CN3 connector is connected to PB3.

OFF SWO signal is not connected.
SB13

(STM_RST)

OFF No incidence on STM32F103C8T6 (ST-LINK/V2) NRST signal.

ON STM32F103C8T6 (ST-LINK/V2) NRST signal is connected to GND.

SB2
(BOOT0)

ON

BOOT0 signal of the STM32L100RCT6 MCU is held low through a
510 Ohm pull-down resistor.

OFF

BOOT0 signal of the STM32L100RCT6 MCU can be set high through a
10 K Ω pull-up resistor R27 to solder.

SB18
(MCO)

(2)

ON Provides the 8 MHz for OSC_IN from MCO of STM32L100RCT6.

OFF See SB16, SB17 description.

1. Default SBx state is shown in bold.

2. OSC_IN clock comes from MCO if SB18 is ON and SB16,17 are OFF
and comes from X2 if SB18 is OFF and SB16,17 are ON.

DocID025091 Rev 1 19/30

UM1656 Hardware and layout

29

4.9 Extension connectors

The male headers P1 and P2 can connect the 32L100CDISCOVERY to a standard
prototyping/wrapping board. STM32L100RCT6 GPI/Os are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.

T able 5. MCU pin description versus board function

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

BOOT0 BOOT0 60 6

NRST NRST 7

RESET

NRST

510

PA0

WKUP1/RTC_TAMP2/
TIM2_CH1_ETR/

USART2_CTS/ADC_IN0/

COMP1_INP

14

USER

15

PA1

TIM2_CH2/USART2_RTS/

LCD_SEG0/ADC_IN1/
COMP1_INP/OPAMP1_VINP

15

16

PA2

TIM2_CH3/TIM9_CH1/
USART2_TX/LCD_SEG1/
ADC_IN2/COMP1_INP/
OPAMP1_VINM

16

17

PA3

TIM2_CH4/TIM9_CH2/
USART2_RX/LCD_SEG2/
ADC_IN3/COMP1_INP/
OPAMP1_VOUT

17

18

PA4

SPI1_NSS/SPI3_NSS/
I2S3_WS/USART2_CK/
ADC_IN4/DAC_OUT1/
COMP1_INP

20

21

PA5

TIM2_CH1_ETR/SPI1_SCK
/ADC_IN5/DAC_OUT2/
COMP1_INP

21

22

PA6

TIM3_CH1/TIM10_CH1/
SPI1_MISO/LCD_SEG3/
ADC_IN6/COMP1_INP/
OPAMP2_VINP

22

23

Hardware and layout UM1656

20/30 DocID025091 Rev 1

PA7

TIM3_CH2/TIM11_CH1/
SPI1_MOSI/LCD_SEG4/
ADC_IN7/COMP1_INP
/OPAMP2_VINM

23

24

PA8

USART1_CK/MCO/
LCD_COM0

41

25

PA9 USART1_TX/LCD_COM1 42 24
PA10 USART1_RX/LCD_COM2 43

23

PA11

USART1_CTS/USB_DM/
SPI1_MISO

44 22

PA12

USART1_RTS/USB_DP/
SPI1_MOSI

45

21

PA13 JTMS-SWDAT 46

SWDIO

420

PA14 JTCK-SWCLK 49

SWCLK

217

PA15

TIM2_CH1_ETR/SPI1_NSS
/SPI3_NSS/I2S3_WS/
LCD_SEG17

50

16

PB0

TIM3_CH3/LCD_SEG5/
ADC_IN8/COMP1_INP/
VREF_OUT/
OPAMP2_VOUT

26

27

PB1

TIM3_CH4/LCD_SEG6/
ADC_IN9/COMP1_INP/
VREF_OUT

27

28

PB2/BO
OT1

COMP1_INP 28 29

PB3

TIM2_CH2/SPI1_SCK/
SPI3_SCK/I2S3_CK/
LCD_SEG7/COMP2_INM

55

SWO

611

Table 5. MCU pin description versus board function (continued)

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

DocID025091 Rev 1 21/30

UM1656 Hardware and layout

29

PB4

TIM3_CH1/SPI1_MISO/
SPI3_MISO/LCD_SEG8/
COMP2_INP

56 10

PB5

TIM3_CH2/I2C1_SMBA/
SPI1_MOSI/SPI3_MOSI
/I2S3_SD/LCD_SEG9/
COMP2_INP

57

9

PB6

TIM4_CH1/I2C1_SCL/
USART1_TX/COMP2_INP

58

8

PB7

TIM4_CH2/I2C1_SDA/
USART1_RX/PVD_IN/
COMP2_INP

59

7

PB8

TIM4_CH3/TIM10_CH1
/I2C1_SCL/LCD_SEG16

61

4

PB9

TIM4_CH4/TIM11_CH1
/I2C1_SDA/LCD_COM3

62

3

PB10

TIM2_CH3/I2C2_SCL/
USART3_TX/LCD_SEG10

29

30

PB11

TIM2_CH4/I2C2_SDA/
USART3_RX/LCD_SEG11

30

31

PB12

TIM10_CH1/I2C2_SMBA/
SPI2_NSS/I2S2_WS/
USART3_CK/LCD_SEG12/
ADC_IN18/COMP1_INP

33

32

PB13

TIM9_CH1/SPI2_SCK/
I2S2_CK/USART3_CTS/
LCD_SEG13/ADC_IN19
/COMP1_INP

34

32

PB14

TIM9_CH2/SPI2_MISO/
USART3_RTS/LCD_SEG14
/ADC_IN20/COMP1_INP

35

31

PB15

TIM11_CH1/SPI2_MOSI
/I2S2_SD/LCD_SEG15/
ADC_IN21/COMP1_INP/
RTC_REFIN

36

30

Table 5. MCU pin description versus board function (continued)

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

Hardware and layout UM1656

22/30 DocID025091 Rev 1

PC0

LCD_SEG18/ADC_IN10/
COMP1_INP

8 11

PC1

LCD_SEG19/ADC_IN11/
COMP1_INP

9

12

PC2

LCD_SEG20/ADC_IN12/
COMP1_INP

10

13

PC3

LCD_SEG21/ADC_IN13/
COMP1_INP

11

14

PC4

LCD_SEG22/ADC_IN14/
COMP1_INP

24

25

PC5

LCD_SEG23/ADC_IN15/
COMP1_INP

25

26

PC6

TIM3_CH1/I2S2_MCK
/LCD_SEG24

37

29

PC7

TIM3_CH2/I2S3_MCK/
LCD_SEG25

38

28

PC8 TIM3_CH3/LCD_SEG26 39

BLUE

27

PC9 TIM3_CH4/LCD_SEG27 40

GREEN

26

PC10

SPI3_SCK/I2S3_CK/
USART3_TX/LCD_SEG28/
LCD_SEG40/LCD_COM4

51

15

PC11

SPI3_MISO/USART3_RX/
LCD_SEG29/LCD_SEG41/
LCD_COM5

52

14

PC12

SPI3_MOSI/I2S3_SD/
USART3_CK/LCD_SEG30/
LCD_SEG42/LCD_COM6

53

13

PC13

WKUP2/RTC_TAMP1/
RTC_TS/RTC_OUT

2

4

Table 5. MCU pin description versus board function (continued)

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

DocID025091 Rev 1 23/30

UM1656 Hardware and layout

29

PC14­OSC32_INOSC32_IN 3

OSC32_IN

5

PC15­OSC32_
OUT

OSC32_OUT 4

OSC32_OUT

6

PD2

TIM3_ETR/LCD_SEG31/
LCD_SEG43/LCD_COM7

54

12

PH0­OSC_IN

OSC_IN 5

OSC_IN

7

PH1­OSC_
OUT

OSC_OUT 6

OSC_OUT

8

VSS VSS 18 19
VDD VDD 19

20

VSS_2 VSS 47

19

VDD_2 VDD 48

18
VLCD VLCD 1 3
VDD_3 64
VDD_1 32
VDDA 13
VSS_3 63
VSS_1 31
VSSA 12

5V 1
3V 1

VDD

5

Table 5. MCU pin description versus board function (continued)

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

Hardware and layout UM1656

24/30 DocID025091 Rev 1

GND

22

GND

GND

3

GND

9

GND

33 33

Table 5. MCU pin description versus board function (continued)

MCU pin Board function

Main

function

Alternate
functions

LQFP64

Push button

LED

SWD

OSC

Free I/O

Power supply

CN3

P1

P2

DocID025091 Rev 1 25/30

UM1656 Mechanical drawing

29

5 Mechanical drawing

Figure 10. 32L100CDISCOVERY mechanical drawing

-36

GND

VDD

GND

VDD

VLCD

PH0

PH1

www.st.com/stm32l1-discovery

MB1108 rev B
STM32L100C-DISCO

Electrical schematics UM1656

26/30 DocID025091 Rev 1

6 Electrical schematics

Figure 11. 32L100CDISCOVERY

-36

STMicroelectronics

Title:

Number: Rev: Sheet of

B.1(PCB.SCH)

Date:

6/3/2013

MB1108 1 3

STM32L100 Discovery

PA13

PA14

NRST

PB3

MCO
PA10
PA9

U_ST_LINK

ST_LINK_V2.SCHDOC

PA13

PA14 TCK/SWCLK

TMS/SWDIO

MCO

NRST
PB3 T_SWO

T_NRST

MCO

PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15

PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15

PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
PC12
PC13
PC14
PC15

PH0

BOOT0

NRST

PD2

RevA.1 --> PCB label MB1108 Rev. A

PA4
PA5

PA0

PA3

PA2

PA1

PB14

PB15

PB2

PB12

PB13

PC0
PC1
PC2
PC3

NRST

PH1

PH0

PC15

PC14

PC13

VLCD

PB10
PB11

PC7

PC8

PC9

PA8

PA9

PA10

PA11

PA12

PA14

BOOT0

PB8

PB9

PA13

PA15

PC10

PC11

PC12

PD2

PB3

PB4

PB5

PB6

PB7

PC6

VDD

3V

5V

VL CD

PH1

PA10
PA9

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

P1

Header 33

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

P2

Header 33

PA6
PA7
PC4
PC5
PB0
PB1

VDD

VDD

BOOT0

PA14
PA15

PC10
PC11
PC12

PD2

PB4
PB5
PB6
PB7
PB8
PB9

PB12
PB13
PB14
PB15

PC6
PC7
PC8
PC9

PA3
PA4
PA5
PA6
PA7

PC4
PC5

PB0
PB1
PB2

PB10
PB11

NRST

MCO

PC14
PC15

PC13

PA0
PA1
PA2

PC0
PC1
PC2
PC3

PB3

VL CD

PA8
PA9

PA11

PA13

PA10

PA12

PH0
PH1

U_STM32L100RCT6
STM32L100RCT6.SchDoc

RevB.1 --> increased PADs of P1 & P2 for easy PCB manufacturing

UM1656 Electrical schematics

DocID025091 Rev 1 27/30

Figure 12. ST-LINK/V2 (SWD only)

-36

STMicroelectronics

Title:

Number: Rev: Sheet of

B.1(PCB.SCH)

Date:

6/3/2013

C10
20pF

C11
20pF

1 2

X1

8MHz

3V

USB_ DM

USB_DP

STM_RST

T_JTCK

T_JTCK

T_JTDO

T_JTDI

T_JTMS

STM_JTMS

STM_JTCK

OSC_ I N
OSC_O UT

T_NRST

R20 4K7

R21 4K7

AIN_1

C8

100nF

R16
100K

R13

100K

3V

3V

3V

SW

IM_IN

SWIM_IN

SWIM_

IN

SW

IM

SWIM

SWIM_RST_ IN

SW I M _ RST

MB1108 2 3

STM32L100 Discovery ST-LINK/V2 (SWD only)

USB_ DM
USB_DP

3V

R6 1K5

R7 0

USB

R5 100K

VCC

1

D-

2

D+

3

ID

4

GND

5

SHELL

0

CN1

5075BMR-05-SM

U5V

COM

5V

3V

R2
1K

PWR

LD1
RED

5V

C7
100nF

C12
100nFC9100nF

C6
100nF

3V

Jumpers ON --> DISCOVERY Selected

VBAT

1

PA7

17

PC13

2

PA12

33

PC14

3

PB0

18

PC15

4

JTMS/SWDIO

34

OSCIN

5

PB1

19

OSCOUT

6

VSS_2

35

NRST

7

PB2

/BOOT1

20

VSSA

8

VDD_2

36

VDDA

9

PB10

21

PA0

10

JTCK

/SWCLK

37

PA1

11

PB11

22

PA2

12

PA15/JTDI

38

PA3

13

VSS_1

23

PA4

14

PB3/ JTD O

39

PA5

15

VDD_1

24

PA6

16

PB4/ JNT RST

40

PB12

25

PB5

41

PB13

26

PB6

42

PB14

27

PB7

43

PB15

28

BOOT0

44

PA8

29

PB8

45

PA9

30

PB9

46

PA10

31

VSS_3

47

PA11

32

VDD_3

48

U2
STM32F 103C8T6

Board Ident: PC13=0

T_JTCK

T_JTMS

SWD

3V

123

4

CN2

SB6 SB5

SB8 SB7

SB10 SB9

SB12 SB11

STM_JTMS

STM_JTCK

SWCLK

SWDIO

SWD

RESE R V ED

DEFAULT

3V

T_SW DIO_IN

T_SWO
LED _S TL INK

LED STLINK

3V

R4

100

R3

100

R1

0

Red

_Green

2 1

3 4

LD2

LD_BICOLOR_CMS

R12

22

R14

22

R19 10K

R18 10K

PA13

PA14

TCK /SWCLK

TMS/SWDIO

VDD3V

R9
10K

R8 0

Not Fitted

MCO

C1
1uF_X5R_0603

C3
10nF_X7R_0603

C4
1uF_X5R_0603

C2
100nF

C5
100nF

MCO

Not Fitted

T_JRST

R11
100

1
2
3
4
5
6

CN3

Header 6

R10

100

AIN_1

T_NRST

T_SWO

NRST
PB3

R15

22

R17

22

SB19

SB22

T_NRST

T_SWO

Not Fitted

SB13

RC Must be very close to STM32F103 pin 29

JP2

51

2

GND

3

4

BYPASS

INH

Vin Vout

U1

LD3985M33R

D1

BAT60JFILM

D2

BAT60JFILM

D3

BAT60JFILM

R34

100

C24
20pF

EXT_5V

OUT_3V

JP1TXRX

STLINK_RX

Not Fitted

SB14

SB15

STLI N K_ T X

PA10

PA9

STM32L100C USART1_RX

Close to JP
Not Fitted

Idd

Jumpesr OFF --> ST-LINK DISCOVERY Selected

STM32L100C USART1_TX

Electrical schematics UM1656

28/30 DocID025091 Rev 1

Figure 13. MCU

-36

STMicroelectronics

Title:

Number: Rev: Sheet of

B.1(PCB.SCH)

Date:

6/3/2013

MB1108 3 3

STM32L100 Discovery MCU

C21
100nF

C19
100nF

VDD

C20
100nF

VDD

PA0

PA1

PA2

PA3

PA4

PA5

PA6

PA7

PA8

PA9

PA10

PA11

PA12

PA13

PA14
PA15

PB0

PB1

PB2

PB3
PB4
PB5
PB6
PB7

PB8
PB9

PB10

PB11

PB12

PB13

PB14

PB15

PC0

PC1

PC2

PC3

PC4

PC5

PC6

PC7

PC8

PC9

PC10
PC11
PC12

PC13
PC14
PC15

PH0

PH1

PD2

C15

6.8pF

C16

6.8pF

R24
0

R25
0

C13
20pF

C14
20pF

R22
390

VDD

R27

10K

VDD

NRST

BOOT0

1 2

X2

8MHz

41

32

X3

MC306-G-06Q-32.768 (JFVNY)

R26

510

SB2

BOOT0

PA14
PA15
PC10
PC11
PC12

PD2
PB3
PB4
PB5
PB6
PB7

PB8
PB9

PB12

PB13

PB14

PB15

PC6

PC7

PC8

PC9

PA8

PA9

PA10

PA11

PA12

PA13

PA3

PA4

PA5

PA6

PA7

PC4

PC5

PB0

PB1

PB2

PB10

PB11

LD3

green

PC9

R30

330

LD4

blue

PC8

R31

660

C22

100nF

R29
220K

VDD

SB3

R28

330

R32

100

USER & WAKE-UP Button

PA0

Not Fitted

NRST

NRST

RESET Button

C23

100nF

R33
100K

VDD

SB4

Not Fitted

14

3 2

B2

SW- PU SH- C M S

1

4

3 2

B1

SW- PU SH- C M S

MCO

MCO

SB18

PC14
PC15

PH0

PH1

PC13

SB20

PA0

PA1

PA2

PC0

PC1

PC2

SB17

SB21

VDD

R23
0

SB16

C18
1uF

PC3

VDD

VL CD

C17
1uF

SB1

Close to XTAL & MCU

Close to STM32

Not Fitted

Not Fitted

VLCD

1

PC13 - TAMPER1 - WKUP22PC14 - OSC32_IN

3

PC15 - OSC32_OUT4PH0 - OSC_IN5PH1 - OSC_OUT

6

NRST

7

PC08PC1

9

PC210PC3

11

VSSA / VREF-12VDDA / VREF+13PA0 - TAMPER2 - WKUP114PA115PA2

16

PA3

17

VSS_4

18

VDD_4

19

PA4

20

PA5

21

PA6

22

PA7

23

PC4

24

PC5

25

PB0

26

PB1

27

PB2 or NPOR (1.8V mode)

28

PB10

29

PB11

30

VSS_1

31

VDD_1

32

PB1233PB13

34

PB14

35

PB15

36

PC6

37

PC738PC8

39

PC9

40

PA8

41

PA9

42

PA1043PA11

44

PA1245PA13

46

VSS_2

47

VDD_2

48

PA14

49

PA15

50

PC10

51

PC11

52

PC12

53

PD2

54

PB3

55

PB4

56

PB5

57

PB6

58

PB7

59

BOOT0

60

PB8

61

PB9

62

VSS_3

63

VDD_3

64

U3
STM32L 100RCT6

VDD

VDD

DocID025091 Rev 1 29/30

UM1656 Revision history

29

7 Revision history

Table 6. Document revision history

Date Revision Changes

12-Aug-2013 1 Initial release.

UM1656

30/30 DocID025091 Rev 1

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