Discovery kit for STM32L0 series with STM32L053C8 MCU
Introduction
The STM32L053 discovery kit (32L0358DISCOVERY) helps you to discover the full features
of the STM32L0 series and to develop your applications. It is based on an STM32L053C8T6
and includes an ST-LINK/V2-1 embedded debug tool interface, linear touch sensor, touch
keys, IDD current measurement, 2.04” E-paper display, NFC connector for PLUG-CR95HFB board, LEDs, pushbuttons and an USB mini-B connector.
Table 1 provides the definition of some conventions used in the present document.
Table 1. ON/OFF conventions
ConventionDefinition
Jumper JPx ONJumper fitted
Jumper JPx OFFJumper not fitted
Solder bridge SBx ONSBx connections closed by Solder
Solder bridge SBx OFFSBx connections left open
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UM1775Ordering and product information
2 Ordering and product information
The STM32L053 discovery is a low-cost and easy-to-use development kit to quickly
evaluate and start a development with an STM32L0 series microcontroller.
Before installing and using the product, please accept the Evaluation Product License
Agreement from www.st.com/stm32l0-discovery.
For more information on the STM32L053 discovery board and for demonstration software,
visit www.st.com/stm32l0-discovery.
2.1 Order code
To order the STM32L053 discovery kit, use the order code: STM32L0538-DISCO.
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FeaturesUM1775
3 Features
The STM32L053 discovery board offers the following features:
•STM32L053C8T6 microcontroller featuring 64 KB of flash memory, 8 KB of RAM in an
LQFP48 package
•On-board ST-LINK/V2-1 with selection mode switch to use the kit as a standalone STLINK/V2-1 (with SWD connector for programming and debugging)
•USB re-enumeration capability: three different interfaces supported on USB
–Virtual com port
–Mass storage
–Debug port
•Board power supply: through USB bus or from an external 5 V supply voltage
•External application power supply: 3 V and 5 V
•One linear touch sensor or four touch keys.
•IDD current measurement.
•2.04” E-paper Display, 172x72 pixels.
•NFC connector for PLUG-CR95HF-B board.
•USB USER with Mini-B connector.
•Four LEDs:
–LD1 (red/green) for USB communication
–LD2 (red) for 3.3 V power on
–Two user LEDs: LD3 (green), LD4 (red)
•Two pushbuttons (user and reset)
•Extension header for LQFP48 I/Os for a quick connection to the prototyping board and
easy probing.
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4 Hardware layout
The STM32L053 discovery board has been designed around the STM32L053C8T6
microcontroller in a 48-pin LQFP package.
Figure 2 illustrates the connections between the STM32L053C8T6 and its peripherals (ST-
LINK/V2-1, linear touch sensor, touch keys, IDD current measurement, 2.04” E-paper
display, NFC connector for PLUG-CR95HF-B board, LEDs, pushbuttons and an USB mini-B
connector).
Figure 3 and Figure 4 help you to locate these features on the STM32L053 discovery board.
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32L053
discovery board.
The embedded ST-LINK/V2-1 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.
The changes versus ST-LINK/V2 version are listed below.
•New features supported on ST-LINK/V2-1:
–USB software re-enumeration
–Virtual com port interface on USB
–Mass storage interface on USB
–USB power management request for more than 100 mA power on USB
•Features not supported on ST-LINK/V2-1:
–SWIM interface
–Minimum supported application voltage limited to 3 V
There are two different ways to use the embedded ST-LINK/V2-1 depending on the jumper
states (see Table 2):
•Program/debug the MCU on board (Section 4.1.3).
•Program/debug an MCU in an external application board using a cable connected to
SWD connector CN5 (Section 4.1.4).
Table 2. Jumper states
Jumper stateDescription
Both CN4 jumpers ONST-LINK/V2-1 functions enabled for on board programming (default)
Both CN4 jumpers OFF
ST-LINK/V2-1 functions enabled for application through external CN5
connector (SWD supported)
4.1.1 Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which can be found on www.st.com for
Windows Vista, 7 and 8. On Windows XP the ST-LINK/V2-1 driver requires WinUsb to be
installed before using the ST-LINK/V2-1 (either available from Microsoft website or included
in the USB driver for ST-LINK/V2 for XP).
In case the STM32L053 discovery board is connected to the PC before the driver is
installed, some discovery interfaces may be declared as “Unknown” in the PC device
manager. In this case the user must install the driver files (Figure 5), and from the device
manager update the driver of the connected device.
Note:Prefer using the “USB Composite Device” handle for a full recovery.
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Figure 5. Updating the list of drivers in device manager
4.1.2 ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product (for
example new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit www.st.com at the board delivery, then periodically in order to stay upto-date with the latest firmware version.
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4.1.3 Using ST-LINK/V2-1 to program/debug the STM32L053 on board
To program the STM32L053 on board, simply plug in the two jumpers on CN4, as shown in
Figure 6 in red, but do not use the CN5 connector as that could disturb communication with
the STM32L053C8T6 of the STM32L053 discovery board.
Figure 6. STM32L053 discovery board connections
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4.1.4 Using ST-LINK/V2-1 to program/debug an external STM32 application
It is very easy to use the ST-LINK/V2-1 to program the STM32 on an external application.
Simply remove the 2 jumpers from CN4 as shown in Figure 7 and connect your application
to the CN5 debug connector according to Tab le 3 .
Note:SB13, must be OFF if you use CN5 pin 5 (NRST) in your external application.
Table 3. Debug connector CN5 (SWD)
PïnCN5Designation
1VDD_TARGETVDD from application
2SWLCKSWD clock
3GNDGround
4SWDIOSWD data input/output
5NRSTRESET of target MCU
6SWOReserved
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Figure 7. ST-LINK connections
4.2 Power supply and power selection
The power supply is provided either by the host PC through the USB cable, or by an
external 5 V power supply.
The STM32L053 discovery board requires to the Host PC 300mA, but around 90mA is
needed for its demo, 100mA for an extension board and a safety margin of 100mA.
The D3, D4 and D6 diodes protect the 5 V pins from external power supplies:
•5 V and 3 V can be used as output power supplies when an extension board is
connected to pins P2 and P3.
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In this case, the 5V_O and 3V_O pins deliver a 5 V or 3.3 V power supply and the
power consumption of the extension board must be lower than 100 mA.
•5 V can also be used as input power supplies, e.g. when the USB connector is not
connected to the PC. (5V_I pin of P3 Header)
In this case, the STM32L053 discovery 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.
4.2.1 Power supply input from the USB connector
The ST-LINK/V2-1 supports USB power management allowing to request more than 100
mA current to the host PC.
All parts of the STM32L053 discovery board and extension board can be powered from the
ST-LINK USB connector CN2 (U5V or VBUS). Note that only the ST-LINK part is power
supplied before the USB enumeration as the host PC only provides 100 mA to the board at
that time. During the USB enumeration, the STM32L053 discovery board requires 300 mA
of current to the Host PC. If the host is able to provide the required power, the targeted
STM32 microcontroller is powered and the red LED LD2 is turned ON, thus the STM32L053
discovery board and its extension board can consume a maximum of 300 mA current, not
more. If the host is not able to provide the required current, the targeted STM32
microcontroller and the MCU part including the extension board are not power supplied. As
a consequence the red LED LD2 remains turned OFF. In such case it is mandatory to use
an external power supply as explained in the next chapter.
Warning: If the maximum current consumption of the STM32L053 discovery and its
extension boards exceeds 300 mA, it is mandatory to power the STM32L053 discovery
using an external power supply connected to 5V_IN.
Note:In case of this board is powered by an USB charger or USB battery then there is no USB
enumeration so the led LD1 remains OFF permanently and the target MCU is not powered.
In this specific case the jumper JP2 needs to be ON to allow target MCU to be powered
anyway. This is a special use without enumeration and JP2 is not soldered. To use this
optional power supply, solder a 2 pins header in JP2 and set a jumper.
4.2.2 External power supply inputs: 5V_IN or USB USER CN3
The external power source 5V_IN or USB USER CN3 is automatically detected, in this case
the current consumption of STM32L053 discovery board and extension board may exceed
the allowed current on USB. In this condition it is still possible to use the USB for
communication, for programming or debugging only, but it is mandatory to power supply the
board first using 5V_IN or USB USER CN3 then connect the USB cable to the PC.
Proceeding this way ensures that the enumeration occurs thanks to the external power
source.
The following power sequence procedure must be respected:
1.Connect the external power source to 5V_IN or USB USER CN3.
2. Power on the external power supply 5V_IN or USB USER CN3.
3. Check that LD2 is turned ON.
4. Connect the PC to USB connector CN2.
If this order is not respected, the board may be supplied by VBUS first then by 5V_IN or
USB USER CN3, and the following risks may be encountered:
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1.If more than 300 mA current is needed by the board, the PC may be damaged or the
current supply can be limited by the PC. As a consequence the board is not powered
correctly.
2. 300 mA is requested at enumeration (since JP2 must be OFF) so there is a risk that the
request is rejected and the enumeration does not succeed if the PC cannot provide
such current. Consequently the board is not power supplied (LED LD2 remains OFF).
4.3 LEDs
•LD1 COM:
LD1 default status is red. LD1 turns to green to indicate that communications are in
progress between the PC and the ST-LINK/V2-1.
•LD2 PWR:
The red LED indicates that the board is powered.
•User LD3:
The green LED is a user LED connected to the I/O PB4 of the STM32L053C8T6.
•User LD4:
The red LED is a user LED connected to the I/O PA5 of the STM32L053C8T6.
4.4 Pushbuttons
•B1 USER:
User and Wake-Up button connected to the I/O PA0 of the STM32L053C8T6.
•B2 RESET:
The pushbutton connected to NRST is used to RESET the STM32L053C8T6.
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4.5 NFC connector for PLUG-CR95HF-B board
A NFC (Near Field Communication) transceiver board can be connected to the STM32L053
Discovery board, for example the PLUG-CR95HF-B board.
The NFC board is plugged in connector CN1 of STM32L053 Discovery board as following:
Figure 8. NFC board plugged on STM32L053 discovery
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The NFC board can be accessed in SPI or UART mode.
Table 4. NFC connector pin-out
CN1 pin NFC signalsSTM32L053C8T6Description
NFC_IRQOUTN
1
or UART1_TX
NFC_IRQINN or
2
UART1_RX
3NFC_NSSPB12SPI slave select
4NFC_MISOPB14SPI data, slave output
5NFC_MOSIPB15SPI data, slave input
6NFC_SCKPB13SPI serial clock
7+3V3Main power supply/power supply for RF drivers
8GNDGround
PB7
PB6
4.6 Electronic Paper Display (EPD)
The STM32L053 Discovery includes an E-Paper PD with High contrast, High reflectance and
Ultra wide viewing angle.
This display is a TFT active matrix electrophoretic display. The 2.04" active area contains
172x72 pixels, and has 1-bit and 2-bit full display capabilities. An integrated circuit contains
buffers, interface, control logic, oscillator, DC-DC, Etc... (For more information on E-Paper
GDE021A1, see www.good-display.com)
The STM32L053C8T6 controls this peripheral and is able to switch off its power supply.
(See Section 6: Electrical schematics)
Interrupt output for NFC connected to
STM32L053C8T6 UART1 RX
Interrupt input for CR95HF connected to
STM32L053C8T6 UART1 TX
4.7 JP4 (Idd)
Jumper JP4, labeled Idd, allows the consumption of STM32L053C8T6 to be measured
directly by a module onboard able to measure from 100 nA to 50 mA or by removing the
jumper and connecting an ammeter.
•Jumper on position OFF: STM32L053C8T6 is powered (default).
Figure 9. Jumper on position OFF
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•Jumper on position ON: a module onboard is designed to measure from 100 nA to
50 mA by using several MOSFET and switching automatically depending the read
value.
Figure 10. Jumper on position ON
•NO Jumper on JP4: an ammeter must be connected to measure the STM32L053C8T6
current through pin 1 and 2 (if there is no ammeter, the STM32L053C8T6 is not
powered).
Figure 11. No Jumper
4.8 BOOT0 configuration
BOOT0 is at level “0” through a pull-down R65. If you want to set BOOT0 at level “1”, it can
be configured by setting a jumper between P2.6 (BOOT0) and P2.5 (VDD).
Note:If you need to set BOOT0 at level "1" continuously, then unsolder the resistor R65 to avoid a
consumption of 6 mA while connecting pin P2.6 (BOOT0) and P2.5 (VDD) with a jumper or
with a wire.
4.9 Linear touch sensor / touch keys
To demonstrate touch sensing capabilities, the STM32L053 discovery includes a linear
touch sensor which can be used either as a 3-position linear touch sensor or as 4 touch
keys. Both functions are illustrated in the demonstration software.
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3 pairs of I/O ports are assigned to the linear touch sensor / touch keys. Each pair must
belong to the same analog switch group:
•PA2, PA3 (group 1)
•PA6, PA7 (group 2)
•PB0, PB1 (group 3)
To minimize the noise, these pairs are dedicated to the linear touch sensor and the touch
keys and are not connected to external headers. To design a touch sensing application,
refer to the following documentation and firmware:
•For details concerning I/O ports, refer to the STM32L053C8T6 datasheet.
•For information on software development, see DISCOVER application software on
www.st.com/stm32l0-discovery.
•For more detail concerning touch sensing application design and layout, refer to
AN2869 -Guidelines for designing touch sensing applications.
•STM32 touch sensing library available from www.st.com/stm32l0-discovery.
The STM32L053C8T6 MCU controls the linear touch sensor and the touch keys.
4.10 USB device support
The STM32L053C8T6 MCU is also used to drive the second USB mini-B connector (USB
USER) which allows the board to be used as a USB Device. The STM32L053 discovery can
then act as a USB joystick, mouse, or other similar device. If both USBs are connected,
diodes D3 and D4 protect the board and use the power from the USB ST-LINK or USB
USER. Section 4.2.2: External power supply inputs: 5V_IN or USB USER CN3.
The board can be powered through this USB USER connector, in which case LED2 PWR
lights up, LED1 COM blinks and it can run an application in standalone mode.
The STM32L053C8T6 MCU controls the USB USER through PA11 and PA12.
4.11 USART configuration
The USART1 interface available on PA9 and PA10 of the STM32L053C8T6 can be
connected to ST-LINK MCU to use the Virtual Com Port function.
By default the USART1 communication between the target STM32L053C8T6 and ST-LINK
MCU is not enabled.
To use the Virtual Com Port function with:
•The onboard STM32L053C8T6, then set SB2 and SB3 ON. (SB14,15 must be OFF)
•An external MCU then remove solder from SB2 and SB3, solder a 2 pins header on
JP3, then you can connect RX and TX of the external MCU directly to RX and TX of
JP3. (for more details see Section 6: Electrical schematics)
4.12 OSC clock supply
If PH0 is only used as GPIOs instead of as a clock, then SB21 is closed. (SB20 must be
open)
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MCO from ST-LINK (from MCO of the STM32F103CBT6)
This frequency cannot be changed, it is fixed at 8 MHz and connected to PH0-OSC_IN of
the STM32L053C8T6. The configuration needed is:
–SB20 closed and SB21 open
Oscillator from external PH0 (from external oscillator through pin 7 of the P3 connector)
The configuration needed is:
–SB21 closed and SB20 open
Note:Please refer to the AN2867 for oscillator design guide for STM32 microcontrollers.
4.13 OSC 32 kHz clock supply
If PC14 and PC15 are only used as GPIOs instead of as a clock, then SB18 and SB19 are
closed and R70 and R71 are removed.
HSE Oscillator onboard from X2 crystal (not provided)
For typical frequencies and its capacitors and resistors, please refer to the
Datasheet. The configuration needed is:
–SB18, SB19 open
–X2, R70, R71, C47, C50 soldered
Oscillator from external PC14 (from external oscillator through pin 5 of the P3 connector)
the configuration needed is:
–SB18 closed
–SB19 open
–R70 removed
Note:Please refer to the AN2867 for oscillator design guide for STM32 microcontrollers.
STM32L053C8T6
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4.14 Solder bridges
Table 5. Solder bridges
BridgeState
(1)
Description
SB18, 19 (X2 crystal)
SB7,8,9,12 (default)ON Reserved, do not modify
SB4,5,6,11 (reserved)OFFReserved, do not modify
SB2,3 (reserved)OFFReserved, do not modify
SB29 (B2-RESET)
SB22 (B1-USER)
SB14, 15 (RX, TX)
SB16, 17
(USB_USER)
SB23,24,25,26,27,28
(touch sensor)
SB1 (ST-LINK PWR)
OFF
ONPC14, PC15 are connected from P3. Remove only R70 and R71
ON B2 Push Button is connected to NRST of STM32L053C8T6
OFFB2 Push Button is not connected to NRST of STM32L053C8T6
ONB1 Push Button is connected to PA0
OFFB1 Push Button is not connected to PA0
OFF
ONPA2, PA3 of STM32F103CBT6 are connected to PB4, PB3 of STM32L053C8T6
OFF USB1_DP and USB1_DM are dedicated to the USB USER connector CN3
ON
OFFPA2 , PA 3 , PA 6, PA7, PB0, PB1 are dedicated to touch sensor.
ONPA2, PA3, PA6, PA7, PB0, PB1 are available as GPIO on P2, P3 headers.
ON ST-LINK module is powered
OFFST-LINK module is not powered
X2, C47, C50, R70 and R71 provide a clock. PC14, PC15 are disconnected
from P3.
PA2, PA3 of STM32F103CBT6 are not connected to PB4, PB3 of
STM32L053C8T6
USB1_DP is connected to PA12 and USB1_DM is connected to PA11. Both are
available as GPIO on P2, P3 headers.
SB21 (OSC_IN)
SB13 (NRST)
SB10 (STM_RST)
SB20 (MCO)
1. Default value is in bold.
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OFF
ONNo connection between header P3.7 and PH0 of STM32L053C8T6
ON
OFFT_NRST signal is not connected
OFFNo incidence on NRST signal of STM32F103CBT6
ONNRST signal of STM32F103CBT6 is connected to GND
ON
OFFMCO signal of STM32F103CBT6 is not used.
Clock signal from header P3.7 is connected to OSC_IN of STM32L053C8T6 or
PH0 is available as GPIO. SB20 must be OFF
T_NRST signal from connector CN5 and STM32F103CBT6, is connected to
NRST of STM32L053C8T6
MCO clock signal from STM32F103CBT6 is connected to OSC_IN of
STM32L053C8T6. SB21 must be OFF
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4.15 Extension connectors
The male headers P2 and P3 can connect the STM32L053 discovery board to a standard
prototyping/wrapping board. STM32L053C8T6 GPI/Os are available on these connectors.
P2 and P3 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 6. Extension connectors
MCU pinBoard function
(1)
Main function
BOOT044
NRST7
PA010
PA111
PA212
PA313
PA414
LQFP48 pin num.
SYSTEM
VCP
-
BOOT0
-
NRST
-
-
-
-
-
-
-
-
-
-
PushButtons
LED
NFC CR95HF-B
-
-
-
-
-
-
-
-
BP_USER
-
-
-
-
-
-
-
-
-
-
-
-
USB USER
Linear touch sensor
-
-
-
-
-
-
-
-
-
TS_G1_IO3
-
TS_G1_IO4
-
-
E-paper Display
Idd Measure
-
-
-
-
-
-
-
MFX_WAKEUP
-
-
-
-
-
-
Free I/O
Power SupplyP2P3
-
-
-
-
-
-
-
-
-
-
-
-
-
PA4
CN1
CN3
SBx
-
-
-
6
-
-
11
-
12
-
13
-
14
-
15
-
9
-
-
-
-
-
-
-
-
-
-
-
-
SB28
SB27
-
-
PA515
PA616
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RED
-
-
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-
-
-
TS_G2_IO3
16
-
17
-
-
-
-
-
SB26
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Table 6. Extension connectors (continued)
MCU pinBoard function
(1)
Main function
PA717
PA829
PA930
PA1031
PA1132
PA1233
LQFP48 pin num.
SYSTEM
-
-
-
-
-
-
VCP
-
-
USART_TX
USART_RX
-
-
PushButtons
LED
-
-
-
-
-
-
-
-
-
-
-
-
NFC CR95HF-B
-
-
-
-
-
-
USB USER
Linear touch sensor
-
TS_G2_IO4
-
-
-
-
-
-
-
USB_DM
-
USB_DP
E-paper Display
Idd Measure
-
-
-
ePD1_BUSY
-
-
-
-
-
-
-
-
Free I/O
Power Supply
P2
P3
CN1
CN3
SBx
-
-
-
18
-
SB25
-
-
19
-
-
18
-
-
17
-
-
16
-
-
-
-
-
-
-
-
-
-
-
-
-
(2)
-
2
SB17
-
-
15
-
(2)
-
3
SB16
-
-
-
-
-
-
PA1334
-
SWDIO
-
-
-
-
-
-
PA1437
-
SWCLK
-
-
-
-
-
-
PA1538
-
ePD1_CS
PB018
-
-
-
-
-
-
-
TS_G3_IO2
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-
-
14
-
-
-
13
-
-
-
12
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
19
-
SB24
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Table 6. Extension connectors (continued)
MCU pinBoard function
(1)
Main function
PB119
PB220
PB339
PB440
PB541
LQFP48 pin num.
SYSTEM
-
-
-
-
-
VCP
-
-
-
-
-
PushButtons
LED
-
-
-
-
-
-
-
GREEN
-
-
NFC CR95HF-B
-
-
-
-
-
USB USER
-
-
-
-
-
Linear touch sensor
TS_G3_IO3
-
-
-
-
E-paper Display
Idd Measure
-
-
-
ePD1_RESET
-
ePD1_SCK
-
-
-
ePD1_MOSI
Free I/O
Power Supply
P2
P3
CN1
CN3
SBx
-
-
-
20
-
SB23
-
-
-
21
-
-
11
-
-
10
-
-
9
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PB642
PB743
PB845
-
-
-
-
-
-
-
-
-
-
-
8
-
2
-
NFC_IRQINN
-
-
-
-
-
-
-
-
-
-
-
7
-
1
-
NFC_IRQOUTN
-
-
-
-
-
-
-
-
-
-
-
-
-
4
-
MFX_I2C_SCL
DocID026429 Rev 227/39
38
Page 28
Hardware layoutUM1775
Table 6. Extension connectors (continued)
MCU pinBoard function
(1)
Main function
PB946
PB1021
PB1122
PB1225
PB1326
LQFP48 pin num.
SYSTEM
-
-
-
-
-
VCP
-
-
-
-
-
PushButtons
LED
-
-
-
-
-
-
-
-
-
-
NFC CR95HF-B
-
-
-
NFC_NSS
USB USER
-
-
-
-
-
Linear touch sensor
-
-
-
-
-
E-paper Display
Idd Measure
-
MFX_I2C_SDA
-
ePD1_PWR8ENn
-
ePD1_D/C
-
-
-
-
Free I/O
Power Supply
P2
P3
CN1
CN3
SBx
-
-
-
-
-
-
-
-
23
-
-
22
-
-
-
3
-
22
-
23
-
-
-
3
-
6
-
-
-
-
-
-
-
-
-
NFC_SCK
-
-
-
PB1427
-
PB1528
PC132
28/39DocID026429 Rev 2
-
-
-
-
-
-
-
-
-
NFC_MISO
-
NFC_MOSI
-
-
-
-
-
-
-
-
-
-
-
21
-
-
-
20
-
-
MFX_IRQ_OUT
-
-
-
4
-
4
5
-
-
-
-
-
-
Page 29
UM1775Hardware layout
Table 6. Extension connectors (continued)
MCU pinBoard function
(1)
Main function
PC143
PC154
PH05
PH16
-
-
-
LQFP48 pin num.
-
-
-
SYSTEM
OSC32_IN
OSC32_OUT
OSC_IN
-
-
-
-
VCP
-
-
-
-
-
-
-
PushButtons
LED
-
-
-
-
-
-
-
-
-
-
-
-
-
-
NFC CR95HF-B
-
-
-
-
-
-
-
USB USER
-
-
-
-
-
-
-
Linear touch sensor
-
-
-
-
-
-
-
E-paper Display
Idd Measure
Free I/O
Power Supply
P2
P3
CN1
CN3
SBx
-
-
-
-
-
-
5
-
PC14
-
-
-
-
-
-
6
-
PC15
-
-
-
-
-
-
-
7
-
-
-
-
PH1
-
-
-
-
-
8
-
-
-
-
-
-
1
5V_USB_USER
-
-
3V3
-
-
-
-
1
-
1
-
7
-
-
-
-
5V_IN
-
VDD24
VDD48
VDD_USB36
VDDA9
VLCD1
VSS23
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3
-
5V_OUT
-
-
-
-
-
-
-
-
-
VDD
-
-
-
-
-
-
-
-
-
VDD
-
-
-
-
-
-
-
-
-
VDD
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
VDD
-
-
-
-
-
-
-
-
-
-
2284
GND
(2)
-
DocID026429 Rev 229/39
38
Page 30
Hardware layoutUM1775
Table 6. Extension connectors (continued)
MCU pinBoard function
(1)
Main function
VSS35
VSS47
VSSA8
-
1. Signals available depending on SBx value. Refer to Table 5: Solder bridges or schematics in Section 6.
Figure 17. Linear touch sensor, NFC, USB and pushbutton
36/39DocID026429 Rev 2
Page 37
66
IDD measurement / MFX (Multi Function eXpander)
MB1143B-01
26-May-14
Title:
Size:Reference:
Date:Sheet: of
A4
Revision:
STM32L0538-DISCO
Project:
MFX_WAKEUP
MFX_IRQ_OUT
R62
100
VDD
1
4
3
2
11
V+
V-
U7A
TSZ124IPT
7
5
6
U7B
TSZ124IPT
8
10
9
U7C
TSZ124IPT
14
12
13
U7D
TSZ124IPT
All this block must be very close to the STM32L152
C38
100nF
C41
100nF
C42
100nF
L2
Ferrite
C34
100nF
C36
1uF
C40
100nF
R45
510
3V3
R68
4K7_1%_0402
R67
100K_1%_0402
MFX_IDD_SH0
R56
10K_1%_0402
R54
10K_1%_0402
R53
10K_1%_0402
R58
10K_1%_0402
VDDA_L1
C45
100nF
C43
100nF
R4710K
R40 10K
3V3
3V33V3
3V3
3V3
3V3
VDDA_L1
3V3
MFX_IDD_MEAS
MFX_IDD_MEAS
123
4
CN6
MFX_SWCLK
MFX_SWCLK
MFX_I2C_SCL
MFX_I2C_SDA
MFX_I2C_SDA
MFX_I2C_SCL
R46
2K2
R48
2K2
3V3
1
2
3
JP4
C46
100nF
C32
100nF
R63
1K_0.1%_0402
R64
49K9_0.1%_0402
R66
1K_0.1%_0402
R61
49K9_0.1%_0402
VLCD
1
PA7
17
PC13
2
PA12
33
PC14/OSC32_IN
3
PB0
18
PC15/OSC32_OUT
4
PA13
34
PH0/OSC_IN
5
PB1
19
PH1/OSC_OUT
6
VSS_2
35
NRST
7
PB2
20
VSSA
8
VDD_2
36
VDDA
9
PB10
21
PA0
10
PA14
37
PA1
11
PB11
22
PA2
12
PA15
38
PA3
13
VSS_1
23
PA4
14
PB3
39
PA5
15
VDD_1
24
PA6
16
PB4
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
U6
STM32L152CCT6
R59
1_1%_0805
C39
1uF
R390
MFX_USART3_RX
MFX_USART3_TX
MFX_IRQ_OUT
MFX_SWDIO
MFX_IDD_SH1MFX_IDD_SH2
MFX_IDD_CAL
MFX_IDD_CAL
MFX_IDD_SH2
MFX_IDD_SH1
MFX_IDD_SH0
MFX_I2C_SCL
MFX_I2C_SDA
MFX_SWDIO
3
4
5
G
SD
621
T13
FDC606P
MFX_USART3_RX
MFX_USART3_TX
MFX_USART3_RX
MFX_USART3_TX
4
3
5
G
SD
678
2
1
T14
STS7P2UH7
3
4
5
G
SD
6
2
1
T11
FDC606P
435
G
SD
6
7
8
2
1
T12
STS7P2UH7
3
4
5
G
SD
621
T9
FDC606P
4
3
5
G
SD
678
2
1
T10
STS7P2UH7
3
4
5
G
SD
621
T7
FDC606P
4
3
5
G
SD
678
2
1
T8
STS7P2UH7
R49 10K
R51 100K
VDD
5V
3V3
5V
R50 1K_1%_0402
3V3
MFX_VDD_MCU
MFX_I2C_ADDR
R57
10K_1%_0805
R52
24_1%_0805
R55
620_1%_0805
T12, T14 Not Fitted
T8, T10 Not Fitted
Not Fitted
UM1775Electrical schematics
Figure 18. IDD measurement / MFX (Multi Function eXpander)
MFX
Multi Function eXpander
differential amplifier
DocID026429 Rev 237/39
38
Page 38
Revision historyUM1775
7 Revision history
DateRevisionChanges
20-June-20141initial release
24-June-20142Removed embedded USB bootloader paragraph.
Table 7. Document revision history
38/39DocID026429 Rev 2
Page 39
UM1775
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