ST 32L152CDISCOVERY User manual

October 2023 UM1079 Rev 5 1/38
1
UM1079
User manual
Discovery kit with STM32L152RC MCU
Introduction
The 32L152CDISCOVERY Discovery kit helps the development of applications based on
the STM32L1 series microcontrollers and benefits from the ultra-low-power features of
these devices.
Based on the STM32L152RC microcontroller, this Discovery kit includes an ST-LINK/V2
embedded debugging tool interface, a 24-segment 4-common LCD, LEDs, push-buttons, a
linear touch sensor, and touchkeys.
Figure 1. 32L152CDISCOVERY board
1. Picture is not contractual.
www.st.com

Contents UM1079
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Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Codification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Development toolchains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 32L152CDISCOVERY top and bottom layouts . . . . . . . . . . . . . . . . . . . . 12
6.2 Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3 Embedded ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3.1 Using the ST-LINK/V2 to program/debug the on-board microcontroller 16
6.3.2 Using the ST-LINK/V2 to program/debug an external application . . . . . 17
6.4 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.5 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.6 Push-buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.7 Linear touch sensor and touchkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.8 Built-in IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.8.1 High IDD range mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.8.2 Low IDD range mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.8.3 IBIAS current measurement procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.9 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.10 LCD (24 segments, four commons) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 Extension connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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UM1079 Contents
3
8 32L152CDISCOVERY product information . . . . . . . . . . . . . . . . . . . . . . 32
8.1 Product marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.2 32L152CDISCOVERY product history . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.3 Board revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9 Federal Communications Commission (FCC)
and ISED Canada Compliance Statements . . . . . . . . . . . . . . . . . . . . . . 35
9.1 FCC Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1.1 Part 15.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1.2 Part 15.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1.3 Part 15.105 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2 ISED Compliance Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

List of tables UM1079
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List of tables
Table 1. Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2. Codification explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Executed functions when clicking the B1 button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 5. Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 6. SWD debug connector (CN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 7. Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 8. LCD connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 9. MCU pin description versus board function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 10. Product history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 11. Board revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

UM1079 Rev 5 5/38
UM1079 List of figures
5
List of figures
Figure 1. 32L152CDISCOVERY board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3. Top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4. Bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5. Mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 6. 32L152CDISCOVERY connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 7. ST-LINK connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 8. IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 9. Low IDD range measurement timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10. LCD segment mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Features UM1079
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1 Features
•STM32L152RC Arm®(a) Cortex®-M3 core-based microcontroller with 256 Kbytes of
flash memory, 32 Kbytes of RAM, and 8 Kbytes of data EEPROM in an LQFP64
package
•24-segment 4-common LCD in a DIP28 package
•Four LEDs:
– LD1 (red/green) for USB communication
– LD2 (red) for 3.3 V power-on
– Two user LEDs, LD3 (green) and LD4 (blue)
•User and reset push-buttons
•One linear touch sensor and four touchkeys
•Board connectors:
– Serial Wire Debug port (SWD)
– Extension header for LQFP64 I/Os for quick connection to prototyping board and
easy probing
•Flexible power supply options: ST-LINK USB VBUS or external sources
•External application power supply: 3 V and 5 V
•IDD current measurement
•Comprehensive free software libraries and examples available with the STM32Cube
MCU Package
•On-board ST-LINK/V2 debugger/programmer with USB re-enumeration capability:
Virtual COM port, and debug port
•Support of a wide choice of Integrated Development Environments (IDEs) including
IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE
•The former STM32L-DISCOVERY Discovery kit offered the same features except for
the STM32L152RB microcontroller with 128 Kbytes of flash memory, 16 Kbytes of
RAM, and 4 Kbytes of data EEPROM, in an LQFP64 package.
a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.

UM1079 Rev 5 7/38
UM1079 Ordering information
37
2 Ordering information
To order the 32L152CDISCOVERY ultra-low-power Discovery kit, refer to Table 1.
2.1 Codification
The meaning of the codification is explained in Table 2.
Table 1. Ordering information
Order code Board reference Target STM32L1
STM32L152C-DISCO(1)
1. Subsequently called main board in the rest of the documentation.
MB963 STM32L152RCT6
STM32L-DISCOVERY(2)
2. STM32L-DISCOVERY is replaced by STM32L152C-DISCO.
STM32L152RBT6
Table 2. Codification explanation
STM32XXYYZ-
DISCO Description Example: STM32L152C- DISCO
STM32XX MCU series in STM32 32-bit Arm Cortex
MCUs STM32L1 series
YY MCU product line in the series STM32L151/152
ZSTM32L1 flash memory size:
-C for 256 Kbytes 256 Kbytes
DISCO Discovery kit Discovery kit

System requirements UM1079
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3 System requirements
3.1 System requirements
•Multi-OS support: Windows®10, Linux®64-bit, or macOS®(a)(b)(c)
•USB Type-A or USB Type-C® to Mini-B cable
3.2 Development toolchains
•IAR Systems®- IAR Embedded Workbench®(d)
•Keil®- MDK-ARM(d)
•STMicroelectronics - STM32CubeIDE
3.3 Demonstration software
The demonstration software, included in the STM32Cube MCU Package corresponding to
the on-board microcontroller, is preloaded in the STM32 flash memory for easy
demonstration of the device peripherals in standalone mode. The latest versions of the
demonstration source code and associated documentation can be downloaded from
www.st.com.
a. macOS®is a trademark of Apple Inc., registered in the U.S. and other countries and regions.
b. Linux®is a registered trademark of Linus Torvalds.
c. Windows is a trademark of the Microsoft group of companies.
d. On Windows®only.

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UM1079 Conventions
37
4 Conventions
Table 3 provides the conventions used for the ON and OFF settings in the present
document.
The following sections of this user manual are also applicable to the STM32L-DISCOVERY
except for specific features of the STM32L152RB microcontroller with 128 Kbytes of flash
memory, 16 Kbytes of RAM, and 4 Kbytes of data EEPROM.
Table 3. ON/OFF conventions
Convention Definition
Jumper JPx ON Jumper fitted
Jumper JPx OFF Jumper not fitted
Jumper JPx [1-2] Jumper fitted between pin 1 and pin 2
Solder bridge SBx ON SBx connections closed by 0 resistor
Solder bridge SBx OFF SBx connections left open
Resistor Rx ON Resistor soldered
Resistor Rx OFF Resistor not soldered
Capacitor Cx ON Capacitor soldered
Capacitor Cx OFF Capacitor not soldered

Quick start UM1079
10/38 UM1079 Rev 5
5 Quick start
Before using the Discovery kit, accept the evaluation product license agreement available
on the 32L152CDISCOVERY page of the www.st.com/mcu website.
5.1 Getting started
The following sequence configures 32L152CDISCOVERY and launches the Discovery
application:
•Check jumper positions on the board: JP1 and CN3 must be ON (Discovery selected)
(refer to Figure 3).
•Connect the 32L152CDISCOVERY to a computer with a USB cable to power the
board. The red LEDs LD2 (PWR) and LD1 (COM) are lit up. Function 1 is executed.
•Click on the user button (B1) to change the executed function as described in Table 4.
The 4-LED bar shows the performed function (up to four bars can be switched ON).
Depending on the function selected, the voltage value, the linear touch sensor position, the
touchkeys status, or the STM32L152RC, the current consumption is displayed on the LCD.
Refer to the www.st.com/mcu website for more details on the Discovery project and the
STM32L152RC features.
Table 4. Executed functions when clicking the B1 button
Function LED LD3/4 Bar
status Value displayed on LCD Main function
1LD3 and
LD4 blink Measured STM32L152RC VDD voltage Voltage measurement
2 LD3 ON Linear touch sensor position from 0 to 100% Touch sensing
3 LD4 ON Status of the four touchkeys
4
LD3 and
LD4 OFF
STM32L152RC consumption is measured in Run
mode (4 MHz).
STM32L152RC current
consumption
measurement
STM32L152RC consumption is measured in Sleep
mode (4 MHz).
5
STM32L152RC consumption is measured in Run
mode (32 KHz).
STM32L152RC consumption is measured in
Low-power sleep mode (32 KHz).
6
STM32L152RC consumption is measured in Stop
mode, RTC ON.
STM32L152RC consumption is measured in Stop
mode, RTC OFF.
7STM32L152RC consumption is measured in Standby
mode.