ST STEVAL-FSM01M1 User manual

Introduction
STEVAL-FSM01M1 is an industrial dual channel digital I/O board for safe automation. It provides a powerful test platform for
deep technical evaluation of ST’s smart power ICs for factory automation and functional safety.
The PCB provides a digital interface compatible with STM32 Nucleo boards which is galvanically isolated from the power side
of the board using digital signal isolators including STISO621. The process side I/O section is based on a dual channel digital
input current limiter CLT03-2Q3 and Intelligent Power Switches IPS160HF and IPS161HF. These core ICs are accompanied
with many other industrial-grade ST ICs which play the critical role in providing all the needed auxiliary functions like DC voltage
supply management (L7983, LDK220), onboard runtime condition monitoring ADC (ADC120) and other safety features and
protections.
STEVAL-FSM01M1 (PCB, board or module in the following text) provides a high-level of flexibility and testing options thanks to
a multi-level redundancy of its overall implementation. For example, the system protection scheme can be flexibly adapted in
several ways by simply modifying the assembly configuration of onboard components. This allows R&D engineers to optimize
and finetune design of the final product according to their exact application requirements already during the prototyping phase of
development.
The board can be operated either as a standalone evaluation testbed or it can be connected in combination with an STM32
Nucleo board to provide a complete evaluation ecosystem. An associated firmware package STSW-FSM01 (available at
www.st.com) provides routines to operate all functions of the PCB, plus it supports a simple user command interface allowing to
control the board interactively from PC. This firmware package for STM32 is compatible with NUCLEO-F401RE however, it can
be adapted to run on any other STM32 Nucleo platform.
Figure 1. STEVAL-FSM01M1
Getting started with STEVAL-FSM01M1 safe digital I/O test board
UM3175
User manual
UM3175 - Rev 1 - May 2023
For further information contact your local STMicroelectronics sales office. www.st.com

1Architecture
1.1 Basic characteristics & features
• Design with advanced robustness and safety
• Flexible topology for agile electrical testing of onboard ICs
• Operating range: 8V to 30V (optionally to 60V)
• 2 digital outputs with current rating 2A (OUT1) resp. 0.5A (OUT2)
• 2 digital inputs compatible with IEC 61131-2 Type 1 and 3
• Output section based on IPS160HF and IPS161HF:
– Single-channel Intelligent Power Switch (IPS) for safe automation
– Operating voltage range up to 60V
– Low-power dissipation (RDS(on) = 60 mΩ)
– Output current capability 2A (IPS160HF) and 0.5A (IPS161HF)
– Fast power-up performance for safe automation
– Integrated overcurrent/overtemperature protection and diagnostics
– Fast demagnetization of inductive loads
• Input section based on CLT03-2Q3
– Self-powered dual channel digital input current limiter
– Operating voltage range up to 60V
– Integrated Test Pulse feature allowing self-integrity verification of the IC
• Additional key onboard ICs:
–STISO621 – 100Mbps dual channel signal digital isolator
–L7983, LDK220 – 60V step-down regulator and low noise LDO
–ADC120 – 8-channel 12-bit/1Msps analog-digital convertor with SPI
–STL42P6LLF6 – 60V STripFET F6 Power MOSFET
–SMC30J, SM6T and SM2T3V3A TVS protections
• Embedded redundancy including cascade high-side switch topology
• Runtime control of all IC features (Cut-off limitation and Test-Pulse generation)
• Onboard ADC allows real-time system monitoring and integrity verification
• Status and diagnostic LEDs for each I/O channel
• Two onboard LEDs for user defined indication
• Onboard 1kVRMS galvanic isolation
• Active supply voltage reverse polarity protection
• Compatible with STM32 Nucleo development boards
• Associated firmware package STSW-FSM01 for NUCLEO-F401RE providing all routines for application
programming and command access from PC (through USB)
• Certification and compliance
– CE certified
– RoHS
UM3175
Architecture
UM3175 - Rev 1 page 2/27

1.2 Description
STEVAL-FSM01M1 is a safe dual channel digital I/O expansion board compatible with STM32 Nucleo. Its
system architecture reflects our long-term experience with designing digital I/O applications to reach the highest-
grade robustness and to meet the requirements on reliability of operation in the most challenging industrial
environments such as Factory Automation and Functional Safety.
While majority of standard Nucleo expansion shields are usually plugged-in on top of an STM32 Nucleo board
using the ARDUINO® Uno V3 connectors the STEVAL-FSM01M1, in contrary, provides the base for the Nucleo
board that is connected on top of it by means of its onboard ST morpho extension headers. Hence the
microcontroller pins and peripherals handling the operation of the STEVAL-FSM01M1 are physically separated
from those utilized by other X-NUCLEO boards eventually connected to the system. This way additional
expansion shields can be easily added on top of the stack to extend system functionality while minimizing
possible overlap of utilized microcontroller resources.
The associated STM32 firmware package STSW-FSM01 is compatible with NUCLEO-F401RE however, it can be
easily adapted to run on any other STM32 Nucleo platform.
In further sections of this document we describe functionality of the particular subsystems and features of the
PCB in general. For complete information and detailed understanding of its implementation (schematics, BOM,
layout etc.) please refer also to the documentation freely available on the webpage of the PCB and to the
datasheet specifications of onboard ICs.
1.3 System structure
As a digital I/O board, the STEVAL-FSM01M1 translates low voltage logic level I/O signals (3.3V) provided on its
digital interface and transmits them onto 0/+24V binary signals on its galvanically isolated power domain called
process side.
The PCB can be used either as a standalone testboard with its logic signals provided by a user-specific hardware
(custom host microcontroller board, laboratory test equipment etc.), or it can be plugged together with the
NUCLEO-F401RE and operated from PC utilizing its associated firmware package STSW-FSM01.
Block diagram of the board is shown in Figure 2. It consists of the following main hardware components:
1. Digital interface and galvanic isolation
2. Process side - digital input section
3. Process side - digital output section
4. Power management and supply voltage protection
5. System control and condition monitoring
Figure 2. STEVAL-FSM01M1 block diagram
UM3175
Description
UM3175 - Rev 1 page 3/27

1.3.1 Digital interface and galvanic isolation
All electrical features of STEVAL-FSM01M1 are accessible through its digital interface provided by STM32 Nucleo
compatible onboard ST morpho extension headers CN7 and CN10. These two connectors bring access to the two
onboard user LEDs as well as to the complete functionality on the galvanically isolated process side. Pin mapping
of control signals to the digital interface connectors is illustrated in Figure 3. The digital side is supplied through
the pin ‘3V3’ located on the connector CN7 and any ‘GND’ pin available at CN7 resp. CN10 connectors. The
maximum admissible supply voltage for the digital side is 5V.
In order to decouple sensitive high-speed logic ICs from the power chips exposed to the harsh environment on
process side of the I/O module, the digital interface connectors are galvanically isolated using a set of digital
signal isolators including the 100 Mbps dual channel isolator STISO621.
Figure 3. Digital interface connector pin mapping
1.3.2 Process side
1.3.2.1 Process interface connector
Process side PCB terminal CN1 represents the power supply and digital I/O interface of the board. Its layout
is shown in Figure 4. From the left to the right this connector provides connection of IN1 and IN2 digital input
channels followed by outputs OUT1 (0.5A) and OUT2 (2A). Power supply connector is highlighted using a
differentiated terminal colours. Orange terminal represents connection of positive supply (+24V) and the blue one
represents the GND terminal. Blue terminal (GND) is doubled in order to provide an additional access point for
connecting sensors/actuators and for laboratory test purposes. The last slot (PE, green) represents the earth
connection terminal which is capacitively coupled to both positive and negative power supply lines of the PCB
using high voltage 4.7nF capacitors.
UM3175
System structure
UM3175 - Rev 1 page 4/27

Figure 4. Process interface connector and testpoints
To allow easy system function testing and laboratory measurements the STEVAL-FSM01M1 contains a set of
onboard testpoints which provide measuring access to all the key voltage nodes in the system (power supply
voltage, logic section supply and digital I/O status and diagnostics). These testpoints are also shown in Figure 4.
1.3.2.2 Digital input section
Two independent digital inputs compatible with Type 1 and 3 (ref. IEC 61131-2) are realized using the industry
proven self-powered digital input current limiter CLT03-2Q3. This device integrates two galvanically isolated chips
each of them implementing one digital input channel efficiently translating the process side voltage signals (0V
or 24V) to the logic levels. CLT03-2Q3 further provides a native test-pulse generator which allows IC integrity
verification during runtime. This feature can be actively controlled through the PCB’s digital interface.
1.3.2.3 Digital output section
The output section contains an advanced protection scheme including loss of VCC (resp. GND) protection,
parasitic reverse polarity protection and external demagnetization bypass circuit to boost the system immunity
against any potential electrical overstress. Assembly pattern of the protection components can be widely modified
by the user in order to emulate various custom application scenarios.
Each digital output channel is comprised of a combination of a P-channel MOSFET power switch STL42P6LFF6
in series with a single-channel high-side switch IPS160HF (resp. IPS161HF) providing safety redundancy in each
channel. This is a common topology used in safe automation output systems. First channel (OUT1) is rated for
0.5A nominal loads while the second channel (OUT2) has its nominal current 2A. Apart from the different current
limitation level (resp. current limitation level setting) the two IPS ICs are identical.
IPS16xHF IC’s include a cut-off limitation function which allows significant power dissipation savings in case of
overload. This feature can be also actively controlled through the digital interface.
1.3.2.4 Power management and supply voltage protection
The onboard circuits are supplied from the +24V and GND terminals on the connector CN1. Power supply path is
protected against surge and transient overvolage events by means of filtering low-ESR capacitors and Transient
Voltage Supressor (TVS). Reverse polarity protection is realized based on a 60V P-channel StripFET F6 power
MOSFET ST42P6LLF6 present in positive power supply path (VCC). Logic circuits supply (+3.3V) is derived from
the VCC through a cascade of a step-down switching regulator L7983 (producing onboard VDC 4V) followed by a
low noise linear regulator LDK220.
1.3.2.5 System control and condition monitoring
Each output channel has its own diagnostic signal indicating thermal overstress of the front-end IPS. Diagnostic
signals are propagated to the isolated digital interface.
UM3175
System structure
UM3175 - Rev 1 page 5/27

In addition to the diagnostic function integrated in the IPS16xHF drivers the STEVAL-FSM01 has an onboard
1Msps 12bit A/D converter ADC120 allowing continuous monitoring of operating conditions in all the key system
nodes like VCC voltage, safety P-channel MOSFET outputs (VCC1, VCC2) as well as the channel output voltages
(OUT1, OUT2). This data is accessible during runtime via SPI. Furthermore, voltage nodes in each output
channel that are subject to voltage monitoring (VCCx and OUTx) are accompanied with actively controlled pull-
down resistor circuits for line voltage discharge in order to allow a defined system function verification.
Distribution of integrated circuits on the PCB is illustrated in Figure 5. Complete schematics of the PCB as well as
all the other associated documentation and firmware is available on the STEVAL-FSM01M1 dedicated webpage
at st.com. In the following sections we will describe the particular function blocks and their application more in
detail.
Figure 5. PCB components distribution
UM3175
System structure
UM3175 - Rev 1 page 6/27

2Application
The main purpose of industrial digital I/Os is interfacing with binary sensors and actuators in environments
like factory automation, home & building automation technology and many other application segments like
transportation infrastructure, agriculture machines or automatic PoS systems. Digital I/Os play the key role on the
technological background. Digital I/O application is illustrated on the example of Programmable Logic Controller
(PLC) operating in a smart factory (Figure 6).
Figure 6. Digital I/Os in factory automation
By the term Sensor we can imagine either a simple switch, a button or a smart digital sensing device like a
pressure or temperature sensor, light curtains etc. Actuators are typically devices like valves, lamps or relays
which perform physical actions in the automated environment.
In addition to the standard industrial I/O applications, this evaluation board is specifically designed to meet also
the advanced technical requirements of Safety-critical automation. Therefore it implements additional specific
features ensuring robustness, redundancy and advanced diagnostics.
This evaluation board is primarily intended for use during evaluation and prototyping phase of an application
design to speed-up and simplify development of real industrial systems. It can be connected with actuators and
electrical test loads (resistive, inductive or capacitive) or sensor devices with type 1 and 3 according to IEC
61131-2.
2.1 User controllable IC features
In this section we list and briefly describe all controllable functions of the PCB which can be accessed through the
digital interface (Figure 3).
UM3175
Application
UM3175 - Rev 1 page 7/27

2.1.1 User LEDs
The PCB features two onboard LEDs D12 and D13 located on the digital side (see Figure 7) which are available
for any user-specific indication purpose. The green LED (D12) is contacted to the pin PC2 and the red LED D13 is
contacted to PC3, both located on connector CN7.
Figure 7. Onboard user LEDs D12, D13
2.1.2 I/O section control signals
Below we list the logic signals associated with operation of digital I/O’s in particular. In addition to the elementary
control signals, there are signals allowing to actively control special features of the I/O ICs. The same set of
signals is available for each of the two input (resp. output) channels. Therefore, in order to simplify the notation
and to avoid duplication, in the below lists we don’t specify the channel identification number (‘1’ or ‘2’) and
instead we substitude it with ‘x’. Direction of signals (seen from the microcontroller perspective) is marked in
brackets by ‘R’ (read, input signal) or ‘W’ (write, control signal) together with the feature pin mapping for channel 1
and 2 (separated by ‘ / ’).
Digital inputs
1. OUTPx: input signal reflecting the binary status of digital input INx [R; PC0 / PH1]
2. TPx: control signal enabling function of integrated test pulse generator
(ref. datasheet of CLT03-2Q3) [W, PA15 / PB7]
Digital outputs
1. OUTx_CTRL: Control signal for digital output OUTx [W, PB8 / PA11]
2. OUTx_DSC: Activation of OUTx line discharge pull-down resistor [W, PC10 / PC9]
3. OUTx_DIAG: OUTx IPS diagnostic pin [R, PC12 / PC6]
4. COFFx: Cut-off limitation feature control on OUTx IPS [W, PD2 / PC5]
5. VCCx_CTRL: Control of safety MOSFET switch providing supply voltage for OUTx IPS
[W, PA12 / PB9]
6. VCCx_DSC: Activation of VCCx line discharge pull-down resistor [W, PC8 / PC11]
Onboard voltage monitoring
8-channel A/D converter ADC120 is used for monitoring voltages in all key nodes of the system, namely: VCC,
VCCx and OUTx.
This ADC is accessible through SPI available at the following pins of connector CN10:
1. /CS: Chip Select [W, PB12]
2. SCLK: SPI clock signal [W, PB13]
3. DIN: SPI MOSI signal [W, PB15]
4. DOUT: SPI MISO signal [R, PB14]
UM3175
User controllable IC features
UM3175 - Rev 1 page 8/27

3Getting started
In this section we will describe how to easily setup the basic hardware configuration allowing to operate the PCB
in combination with NUCLEO-F401RE and its associated firmware package STSW-FSM01.
We focus mainly on the description of hardware part of the system in this documet. All needed information related
to software part of the system is available at st.com in a dedicated documentation (UM3176) of STSW-FSM01.
3.1 Hardware components
The following hardware components are required:
1. STM32 Nucleo board NUCLEO-F401RE
2. USB cable (type A to Mini-B USB) to connect the STM32 Nucleo and PC
3. +24V DC power supply with connection wires to supply the
STEVAL-FSM01M1 expansion board
4. Windows PC
3.2 Process side connector operation
CN1 terminal allows connecting all process side components (sensors, actuators, and supply wiring) in a quick
and easy way. You can plug a counductor by simply pushing it as shown inFigure 8.
Figure 8. CN1 conductor connection
Disconnection of a conductor is also easy by gently pressing the corresponding terminal slot using a screwdriver
and then pulling the conductor out according to Figure 9.
Figure 9. CN1 conductor connection
UM3175
Getting started
UM3175 - Rev 1 page 9/27

3.3 System setup and connection
In order to ensure correct operation of the evaluation system please verify that the Nucleo board is in correct
hardware configuration as follows (default HW setup):
• JP5 on U5V for firmware flashing
• JP1 open
• JP6 closed
• CN2 : closed 1-2, 3-4
• CN3 open
• CN4 open
• CN11 open
• CN12 open
Nucleo board shall be flashed with the code available in the firmware package STSW-FSM01. Nucleo board
programming can be done either by downloading a binary file into the microcontroller flash memory using the
STM32CubeProg, or it can be carried out using an IDE (e.g. STM32CubeIDE). All the above-mentioned tools can
be found and downloaded at www.st.com.
Now with all components collected and set correctly the system can be plugged together as shown in Figure 10.
Figure 10. STEVAL-FSM01M1 system setup
If the above evaluation setup is correctly connected and supplied, it indicates presence of process side VCC
voltage by a red LED D11 as also highlighted in Figure 10 and it’s time to play the program.
Note: Rated voltage to supply the board is +24V, however, the onboard firmware is configured to operate in range of
VCC from 21.6V. Lower supply voltage will be detected by the system monitoring routines as undervoltage and in
such case the PCB operation is automatically disabled.
3.4 Program functionality
After power-up or reset of the digital side (Nucleo), the onboard firmware performs an initialization routines
and verifies functionality of the system by toggling onboard LEDs and digital outputs. This procedure takes
around 5 seconds and its runtime is indicated by a green LED LD2 located on the Nucleo board. When PCB
initialization procedure finishes successfully, the LD2 is blicking continuously and the red user LED D13 is off. If
the inicialization doesn’t finish succesfully (e.g. due to undervoltage), this is indicated by the D13 continuously on.
Digital outputs can now be toggled simultaneously using a blue button and signal presence on the digital inputs
is indicated by toggling the user LEDs D12 (IN1) and D13 (IN2). Further functions can be examined utilizing a
command access from PC via USB as described in UM3176.
UM3175
System setup and connection
UM3175 - Rev 1 page 10/27

4Schematic diagrams
Figure 11. STEVAL-FSM01M1 circuit schematics (1 of 6)
GND
ADC_IN0
ADC_IN1
ADC_IN2
ADC_IN3
ADC_IN4 ADC_IN5
ADC_IN6
ADC_IN7
GND
ADC_SCLK
ADC_DOUT
ADC_DIN
ADC_SCLK
GND
ADC_DIN
GND
ADC_DOUT DOUT
DIN
SCLK
/CS
ADC_/CS
GND
/CS
1
AVCC
2
AGND
3
IN0
4
IN1
5
IN2
6
IN3
7
IN4
8IN5 9
IN6 10
IN7 11
DGND 12
DVCC 13
DIN 14
DOUT 15
SCLK 16
U1
ADC120
100nF/50V
C5 100nF/50V C6
1uF/16V
C4 1uF/16V C7
100pF/16V
C2
100pF/16V
C8
100pF/16V
C3
100pF/16V
C1
220R
R4
220R
R3
220R
R1
220R
R2
GND GND GND GND GND
GND
470pF/50V
C52
330R
R90 VCC1_SNSADC_IN0
GND
470pF/50V
C54
330R
R92 OUT1_SNS
GND
470pF/50V
C53
330R
R91 VCC2_SNS
GND
470pF/50V
C55
330R
R93 OUT2_SNSADC_IN1
ADC_IN2
ADC_IN3
3V3
3V3
GND
470pF/50V
C58
330R
R95 VCC_SNSADC_IN4
UM3175 - Rev 1 page 11/27
UM3175
Schematic diagrams

Figure 12. STEVAL-FSM01M1 circuit schematics (2 of 6)
TP1
TP2
TP1
OUTN1
OUTN1
OUTN2
VBUF1
VBUF2
TP1_CTRL
VBUF1
OUTP2
OUTP1
IN2
IN1
GND
GND
GNDGND
GND
TP2
OUTN2
TP2_CTRL
VBUF2
OUTP1
OUTP2
GND GND
PDWN1
PDWN2
INATTL1
6
INA1
7
INB1
8
INATTL2
2
INA2
3
INB2
4
PD2 1
OUTN2 13
OUTP2 16
VBUF2 15
TP2 14
PD1 12
OUTN1 5
OUTP1 11
VBUF1 10
TP1 9
OUTN1 TAB1
OUTN2 TAB2
U2
CLT03-2Q3
Q1
BSS138BK
Q2
BSS138BK
1K
R8
1K
R10
1k3
R6
1k3
R5
10nF/16V
C12
10nF/16V
C14
10nF/100V
C9
10nF/100V
C10
100pF/16V
C11
100pF/16V
C13
nc [0R]
R7
nc [0R]
R9
green
D1
green
D2
IN1
IN2
D23
SM6T33CA
D22
SM6T33CA
GND
GND
UM3175 - Rev 1 page 12/27
UM3175
Schematic diagrams

Figure 13. STEVAL-FSM01M1 circuit schematics (3 of 6)
DGND DGND GNDGND
D3V3 3V3
DGND DGND GNDGND
D3V3
3V3
DGND DGND GNDGND
D3V3 3V3
PB12 /CS
PB13
PB14
PB15 SCLK DIN
DOUT
1kR51 1kR53
OUT1_CTRL
COFF1_CTRL
1kR61 1kR65 OUT1_DSC
100nF/50V
C39 100nF/50V
C40
100nF/50V
C41
100nF/50V
C42
100nF/50V
C45 100nF/50V C46
nc [4.7nF/1kV]
C44
nc [4.7nF/1kV]
C43
1kR50
1kR52
1kR56
1kR60 1kR64
1kR68
1kR54
1kR58 1kR62
1kR66
1kR55
1kR59 1kR63
1kR67
1kR72
1kR73 1kR74
1kR75
OUT1_DIAG
VCC2_CTRL
VCC2_DSC
TP1_CTRL
OUTP1
OUTP2
TP2_CTRL
PC0
PB7
PA15
PC12
PC10
PC11
DGND DGND GND GND
D3V3 3V3
VCC1_CTRL
VCC1_DSC
100nF/50V
C48
100nF/50V
C49
1kR78 1kR80
1kR82 1kR84
1kR86 1kR88
1kR79 1kR81
1kR85 1kR87
OUT2_CTRL
COFF2_CTRL
OUT2_DSC
OUT2_DIAG
PC9
PC8
PC6
PC5
PA12
PA11
PH1
PD2
PB8
PB9
GND
390R
R20
green
D5
GND
390R
R33
green
D8
100nF/50V
C59 100nF/50V C60
100nF/50V
C61 100nF/50V
C62
100nF/50VC63 100nF/50VC64
100nF/50VC65 100nF/50VC66
DGND GND
DGND
DGND
DGND GND
GND
GNDVDD1A
1
GND1
2
VIA
3
VIB
4
VOC
5
VOD
6
VDD1B
7
GND1
8GND2 9
VDD2B 10
VID 11
VIC 12
VOB 13
VOA 14
GND2 15
VDD2A 16
U7
ADUM7442ARQZ
D3V3 3V3
VDD1A
1
GND1
2
VIA
3
VIB
4
VIC
5
VOD
6
VDD1B
7
GND1
8GND2 9
VDD2B 10
VID 11
VOC 12
VOB 13
VOA 14
GND2 15
VDD2A 16
U8
ADUM7441CRQZ-RL7
D3V3 3V3
nc [27k]
R70
OUT1
nc [27k]
R71
OUT2
VDDA
1
GNDA
2
INA1
3
INA2
4
INA3
5
INA4
6
I.C.
7
GNDA
8GNDB 9
ENB 10
OUTB4 11
OUTB3 12
OUTB2 13
OUTB1 14
GNDB 15
VDDB 16
U11
MAX14930EASE+
VDDA
1
GNDA
2
INA1
3
INA2
4
INA3
5
INA4
6
I.C.
7
GNDA
8GNDB 9
ENB 10
OUTB4 11
OUTB3 12
OUTB2 13
OUTB1 14
GNDB 15
VDDB 16
U12
MAX14930EASE+
VDD1
1
RX1
2
TX1
3
GND1
4GND2 5
RX2 6
TX2 7
VDD2 8
U6
STISO621
VDD1
1
RX1
2
TX1
3
GND1
4GND2 5
RX2 6
TX2 7
VDD2 8
U9
STISO621
DGND GND
D3V3
DGND
3V3
GND
D3V3
3V3
GND
nc [220k]
R102
GND
nc [220k]
R103
UM3175 - Rev 1 page 13/27
UM3175
Schematic diagrams

Figure 14. STEVAL-FSM01M1 circuit schematics (4 of 6)
1
2
3
4
5
6
CN8
1
2
3
4
5
6
7
8
CN6
1
2
3
4
5
6
7
8
9
10
CN51 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 34
35 36
37 38
CN7 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 34
35 36
37 38
CN10
PA0
PA1
PA4
PB0
PC1
PC0 1
2
3
4
5
6
7
8
CN9
PA8
PB10
PB4
PB3
PA10
PB5
PA2
PA3
PA9
PC7
PB6
PA7
PA6
PA5
DGND
AVDD
PB9
PB8
IOREF
RESET
D3V3
D5V
DGND
DGND
DVIN
PC9PC10
PC12
DVDD
BOOT0
PA13
PA14
PA15
DGND
PB7
PC13
PC14
PC15
PH0
PH1
VBAT
PC2
PC3
PC8
PC6
PC5
U5V
PA12
PA11
PB12
DGND
PB2
PB1
PB15
PB14
PB13
AGND
PC4
PC11
PD2
E5V
DGND
DGND
PC2
DGND
PC3
390R
R48
680R
R49
green
D12 red D13
2.2uF/16V
C38
DGND
D3V3
100nF/50V
C51
DGND
1
CN1
PE
GND
GND
+24V
IN2
IN1
OUT1
OUT2
UM3175 - Rev 1 page 14/27
UM3175
Schematic diagrams

Figure 15. STEVAL-FSM01M1 circuit schematics (5 of 6)
VCC
GND
OUT1_CTRL OUT1
OUT1_DIAG
VCC1_CTRL VCC1_DSC
VCC1_SNS
GND GND
OUT1_SNS
VCC1
VCC1 VCC1 VCC1
OUT1_DSC
COFF1_CTRL
GND GND
VCC1
VCC
1
IN
2
DIAG
3
CoD
4
NC
5
NC
6
VCC 12
OUT 11
GND 7
OUT 10
OUT 9
OUT 8
VCC 13
U3
IPS160HF
nc
C15
GND
GND
GNDGND
Q4
BSS138BK
Q5
BSS138BK
Q7
BSS138BK
Q6
BSS138BK
1K
R23
27k
R12
nc
R13
3k6
R15
3k6
R18
3k6
R21
62k
R16
62k
R19
3k6
R22
D4
10V
7k5
R17
1k8
R14
10nF/16V
C19
22nF/100V
C16
nc [22nF/100V]
C18
orange
D3
VCC1
OUT1DG1 CH1
nc [0R]
R11
VCC
OUT2_CTRL OUT2
OUT2_DIAG
VCC2_CTRL VCC2_DSC
VCC2_SNS
GND GND
OUT2_SNS
VCC2
VCC2 VCC2 VCC2
OUT2_DSC
COFF2_CTRL
GND GND
VCC2
VCC
1
IN
2
DIAG
3
CoD
4
NC
5
NC
6
VCC 12
OUT 11
GND 7
OUT 10
OUT 9
OUT 8
VCC 13
U4
IPS161HF
nc
C20
GND
GND
GNDGND
Q9
BSS138BK
Q10
BSS138BK
Q12
BSS138BK
Q11
BSS138BK
1K
R36
27k
R25
nc
R26
3k6
R28
3k6
R31
3k6
R34
62k
R29
62k
R32
3k6
R35
D7
10V
7k5
R30
1k8
R27
10nF/16V
C24
22nF/100V
C21
nc [22nF/100V]
C23
orange
D6
VCC2
OUT2DG2 CH2
nc [0R]
R24
D15
STPS1L60
D18
STPS1L60
Q3
STL42P6LLF6
Q8
STL42P6LLF6
D14
STPS1L60
D19
STPS1L60
GND
GND
4k7
R57
4k7R83
4k7
R98
4k7
R99
220kR69
33k
R100
33k
R101
GND
220kR89
GND
D24
SM2T3V3A
GND
D25
SM2T3V3A
GND
D17
SM6T33CA
D21
SM6T33CA
D16
nc [STPS1L60]
D20
nc [STPS1L60]
GND
GND
D27
STPS1L60
nc
R76
GND
GND
D28
STPS1L60
nc
R77
GND
UM3175 - Rev 1 page 15/27
UM3175
Schematic diagrams

Figure 16. STEVAL-FSM01M1 circuit schematics (6 of 6)
D10
SMC30J36CA
PE
PE
+24V+24V
GND
VCC
470nF/16V
C36
VCC
VDC
EN/UVLO
VCC
EN/UVLO
LNM/LCM
VCC
VOUT/FB
1
VBIAS
2
VCC
3
FSW
4
LNM//LCM
5/RST 6
EN/UVLO 7
VIN 8
LX 9
GND 10
EP
11
U5
L7983
nc
C30
+24V
PE
GND
GND GNDGND GND GND GND GND
GND GND GND
GND
GND GND
GND GND
27K
R38
D9
10V
7k5
R40
1k8
R39
100nF/100V
C26
4.7uF/100V
C27
4.7uF/100V
C28
0R
R44
red
D11
1uF/100V
C33
100nF/100V
C32
GND
2.2uF/16V
C34 100nF/50V C35
GND
nc
R43
0R
R45
nc
R47
nc
C31
nc
C37
4.7nF/2kV
C25
4.7nF/2kV
C29
100k
R46
68k
R42
18k
R41
nc [0R]
R37
GNDGND
GND
nc
R94 VDC
GND
1uF/16V
C56
GND
3V3
1uF/16V
C57
GND
VDC
IN
EN
GND
OUT
U10
LDK220
L1 47uH
+3V3
3k6
R97
62k
R96
GND
VCC_SNS
VDC
Q13
STL42P6LLF6
D26
STPS1L60
GND
100nF/100V
C22
UM3175 - Rev 1 page 16/27
UM3175
Schematic diagrams

5Bill of materials
Table 1. BOM
Item Q.ty Ref. Part/Value Description Manufacturer Order code
1 6
+3V3 +24V
VDC VCC
VCC1 VCC2
Test Point Red hole
diam. 1,6mm Test point - red KEYSTONE 5000
2 12
CH1 CH2
DG1 DG2
GND IN1 IN2
OUT1 OUT2
OUTP1
OUTP2 PE
Test Point Black
hole diam. 1,02mm Test point - black KEYSTONE or RS Pro 5001 or 262-2179
3 6 C1 C2 C3 C8
C11 C13 100pF CAP CER, 100 pF, 16 V, ± 1%
WURTH
ELEKTRONIK 885012006023
4 4 C4 C7 C56
C57 1uF CAP CER, 1 µF, 16 V, ± 10%, X7R TDK CGA3E1X7R1C105K080AC
5 20
C5 C6 C35
C39 C40 C41
C42 C45 C46
C48 C49 C51
C59 C60 C61
C62 C63 C64
C65 C66
100nF CAP CER, 0.1 µF,
16 V, ± 5%, X7R
WURTH
ELEKTRONIK 885012206095
6 2 C9 C10 10nF
CAP CER, 10000
pF, 100 V, ± 5%,
X7R
WURTH
ELEKTRONIK 885012206114
7 4 C12 C14 C19
C24 10nF
CAP CER, 10000
pF, 16 V, ± 10%,
X7R
WURTH
ELEKTRONIK 885012206040
8 5 C52 C53 C54
C55 C58 470pF CAP CER, 470 pF, 50 V, ± 10%, X7R
WURTH
ELEKTRONIK 885012206081
9 5 C15 C20 C30
C31 C37 n.a. n.a.
10 3 C22 C26 C32 100nF CAP CER, 0.1 µF,
100 V, ± 10%, X7R
WURTH
ELEKTRONIK 885012206120
11 2 C16 C21 22nF
CAP CER, 22000
pF, 100 V, ± 10%,
X7R
KEMET or Murata C0603C223K1RACTU or
GRM188R72A223KAC4D
12 2 C18 C23 22nF
CAP CER, 22000
pF, 100 V, ± 10%,
X7R
KEMET or Murata C0603C223K1RACTU or
GRM188R72A223KAC4D
13 2 C25 C29 4.7nF
CAP CER, High
Voltage, 4700 pF, 2
kV, ± 10%, X7R
WURTH
ELEKTRONIK 885342211008
14 2 C27 C28 4.7nF CAP CER, 4.7 µF,
100 V, ± 10%, X7S TDK or Taiyo Yuden CGA6M3X7S2A475K200AB or HMK325C7475KMHPE
15 1 C33 1uF CAP CER, 1 µF,
100 V, ± 10%, X7S MURATA or TDK GRJ21BC72A105KE11L or CGA4J3X7S2A105K125AB
16 2 C34 C38 2.2uF CAP CER, 2.2 µF,
16 V, ± 10%, X7S TDK CGA3E1X7S1C225K080AC
17 1 C36 470nF CAP CER, 0.47 µF,
16 V, ± 10%, X7R TDK C1608X7R1C474K080AC
UM3175
Bill of materials
UM3175 - Rev 1 page 17/27

Item Q.ty Ref. Part/Value Description Manufacturer Order code
18 2 C43 C44 4.7nF
CAP CER,
ArcShield™, 4700
pF, 1 kV, ± 10%,
X7R
KEMET C0805V472KDRACTU
19 4 R1 R2 R3 R4 220
SMD Chip Resistor,
220 ohm, ± 1%, 100
mW
MULTICOMP PRO
or Yageo
MCWR06X2200FTL or
RC0603FR-07220RL
20 2 R5 R6 1k3
SMD Chip Resistor,
1.3 kohm, ± 1%,
100 mW
Vishay CRCW06031K30FKEA
21 5 R7 R9 R11
R24 R37 0
Zero Ohm Resistor,
Thick Film, 100
mW, 1 A
MULTICOMP PRO
or Yageo
MC0603SAF0000T5E or
RC0603JR-070RL
22 36
R8 R10 R23
R36 R50 R51
R52 R53 R54
R55 R56 R58
R59 R60 R61
R62 R63 R64
R65 R66 R67
R68 R72 R73
R74 R75 R78
R79 R80 R81
R82 R84 R85
R86 R87 R88
1k
SMD Chip Resistor,
1 kohm, ± 0.5%,
100 mW
Panasonic ERJ3RBD1001V
23 7
R13 R26 R43
R47 R76 R77
R94
n.a. n.a.
24 3 R14 R27 R39 1k8
SMD Chip Resistor,
1.8 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Vishay
MCWR06X1801FTL or
CRCW06031K80FKEA
25 1 R38 27k
SMD Chip Resistor,
27 kohm, ± 1%, 125
mW
Vishay CRCW080527K0FKEA
26 2 R12 R25 27k
SMD Chip Resistor,
27 kohm, ± 1%, 100
mW
BOURNS or Yageo CR0603-FX-2702ELF or
RC0603FR-0727KL
27 2 R70 R71 27k
SMD Chip Resistor,
27 kohm, ± 1%, 100
mW
BOURNS or Yageo CR0603-FX-2702ELF or
RC0603FR-0727KL
28 4 R15 R18 R28
R31 3k6
SMD Chip Resistor,
3.6 kohm, ± 1%,
250 mW
YAGEO or Vishay RC1206FR-073K6L or
CRCW12063K60FKEA
29 5 R16 R19 R29
R32 R96 62k
SMD Chip Resistor,
62 kohm, ± 1%, 100
mW
Vishay CRCW060362K0FKEA
30 3 R17 R30 R40 7k5
SMD Chip Resistor,
7.5 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Vishay
MCWR06X7501FTL or
CRCW06037K50FKEAC
31 1 R42 68k
SMD Chip Resistor,
68 kohm, ± 1%, 100
mW
MULTICOMP PRO
or Yageo
MCWR06X6802FTL or
RC0603FR-0768KL
32 3 R20 R33 R48 390
SMD Chip Resistor,
390 ohm, ± 1%, 100
mW
MULTICOMP PRO
or Yageo
MCWR06X3900FTL or
RC0603FR-07390RL
33 5 R21 R22 R34
R35 R97 3k6
SMD Chip Resistor,
3.6 kohm, ± 1%,
100 mW
Vishay or Yageo CRCW06033K60FKEA or
RC0603FR-073K6L
UM3175
Bill of materials
UM3175 - Rev 1 page 18/27

Item Q.ty Ref. Part/Value Description Manufacturer Order code
34 1 R41 18k
SMD Chip Resistor,
18 kohm, ± 1%, 100
mW
MULTICOMP PRO
or Panasonic
MCWR06X1802FTL or
ERJ3EKF1802V
35 2 R44 R45 0
Zero Ohm Resistor,
Thick Film, 100
mW, 1 A
MULTICOMP PRO
or Yageo
MC0603SAF0000T5E or
RC0603JR-070RL
36 1 R46 100k
SMD Chip Resistor,
100 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Yageo
MCMR06X1003FTL or
RC0603FR-07100KL
37 1 R49 680
SMD Chip Resistor,
680 ohm, ± 1%, 100
mW
MULTICOMP PRO
or Vishay
MCWR06X6800FTL or
CRCW0603680RFKEA
38 4 R57 R83 R98
R99 4k7
SMD Chip Resistor,
4.7 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Vishay
MCMR06X4701FTL or
SRMCF0603FT4K70
39 2 R69 R89 220k
SMD Chip Resistor,
220 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Yageo
MCWR06X2203FTL or
RC0603FR-07220KL
40 2 R102 R103 220k
SMD Chip Resistor,
220 kohm, ± 1%,
100 mW
MULTICOMP PRO
or Yageo
MCWR06X2203FTL or
RC0603FR-07220KL
41 5 R90 R91 R92
R93 R95 330
SMD Chip Resistor,
330 ohm, ± 1%, 100
mW
MULTICOMP PRO
or Panasonic
MCWR06X3300FTL or
ERJ3EKF3300V
42 2 R100 R101 33k
SMD Chip Resistor,
33 kohm, ± 1%, 100
mW
MULTICOMP PRO
or Yageo
MCWR06X3302FTL or
RC0603FR-0733KL
43 3 D4 D7 D9 BZV55-C10,115 Zener Diode, 10 V,
500 mW, SOD-80C NEXPERIA BZV55-C10,115
44 7
D14 D15 D18
D19 D26 D27
D28
STPS1L60ZF,
SOD123Flat
60 V, 1 A low drop
power Schottky
rectifier
STMicroelectronics STPS1L60ZF
45 2 D16 D20 STPS1L60ZF,
SOD123Flat
60 V, 1 A low drop
power Schottky
rectifier
STMicroelectronics STPS1L60ZF
46 1 D10 SMC30J36CA, SMC 3000 W, 36 V TVS
in SMC STMicroelectronics SMC30J36CA
47 4 D17 D21 D22
D23 SM6T33CA, SMB 600W TVS in SMB package STMicroelectronics SM6T33CA
48 2 D24 D25 SM2T3V3A, STmite 200 W, 3.3 V TVS in
STmite STMicroelectronics SM2T3V3A
49 3 Q3 Q8 Q13 STL42P6LLF6,
PowerFLAT 5x6
P-channel 60V
MOSFET STMicroelectronics STL42P6LLF6
50 1 U1 ADC120IPT,
TSSOP-16L
8-Channel, 50ksps
to 1Msps, 12-Bit
A/D Converter
STMicroelectronics ADC120IPT
51 1 U2 CLT03-2Q3,
QFN-16L
Self powered digital
input current limiter STMicroelectronics CLT03-2Q3
52 1 U3 IPS160HFTR,
PowerSSO 12 Single-channel IPS STMicroelectronics IPS160HFTR
53 1 U4 IPS161HFTR,
PowerSSO 12 Single-channel IPS STMicroelectronics IPS161HFTR
54 1 U5
L7983PUR, DFN
3X3X0.8 10L PITCH
0.5
60 V, 300 mA
synchronous DCDC STMicroelectronics L7983PUR
UM3175
Bill of materials
UM3175 - Rev 1 page 19/27

Item Q.ty Ref. Part/Value Description Manufacturer Order code
55 1 U10 LDK220M33R,
SOT23-5L
200mA Low noise
LDO STMicroelectronics LDK220M33R
56 2 U6 U9 STISO621, SO-8 Dual channel digital
isolator STMicroelectronics STISO621
57 2 U11 U12 MAX14930EASE+ 4-channel digital
isolator Maxim Integrated MAX14930EASE+
58 1 U7 ADUM7442ARQZ
1 kV RMS Quad-
Channel Digital
Isolator
ANALOG DEVICES ADUM7442ARQZ-RL7
59 1 U8 ADUM7441CRQZ
1 kV RMS Quad-
Channel Digital
Isolator
ANALOG DEVICES ADUM7441CRQZ-RL7
60 10
Q1 Q2 Q4
Q5 Q6 Q7
Q9 Q10 Q11
Q12
BSS138BK,215
Power MOSFET, N
Channel, 60 V, 360
mA, 1 ohm, SOT-23
NEXPERIA BSS138BK,215
61 1 L1 LPS4018-473MRC
Inductor, 47 µH,
LPS4018, 3.9mm x
3.9mm x 1.7mm
Coilcraft LPS4018-473MRC
62 1 CN1_0-4 PCB Terminal block
(GRAY)
4-pole Wago
connector 235-404 Wago 235-404
63 1 CN1_5 PCB Terminal block
(ORANGE)
1-pole Wago
connector 235-746 Wago 235-746
64 2 CN1_6-7 PCB Terminal block
(BLUE)
1-pole Wago
connector 235-744 Wago 235-744
65 1 CN1_8 PCB Terminal block
(GREEN)
1-pole Wago
connector 235-747 Wago 235-747
66 1 CN5 Female Connector
1x10
CON, 2.54 mm, 1
Rows, 10 Contacts,
2212S
MULTICOMP PRO
or Amtek
2212S-10SG-85 or
PS1S85-110-GBL 10P
67 2 CN6 CN9 Female Connector
1x8
CON, 2.54 mm, 1
Rows, 8 Contacts,
2212S
MULTICOMP PRO
or Amtek
2212S-08SG-85 or
PS1S85-108GB-L
68 2 CN7 CN10 Female header
2x19
CON, 2.54 mm, 2
Rows, 38 Contacts,
SSW
SAMTEC or 4UCON SSW-119-01-T-D or 19744
69 1 CN8 Female Connector
1x6
CON, 2.54 mm, 1
Rows, 6 Contacts,
2212S
MULTICOMP PRO
or Amtek
2212S-06SG-85 or
PS1S85-106GB-L
70 5 D1 D2 D5 D8
D12 Led green LED, Green, SMD, 20 mA, 2 V, 570 nm Wurth Elektronik 150060VS75020
71 2 D3 D6 Led orange LED, Amber, SMD,
20 mA, 2 V, 605 nm Wurth Elektronik 150060AS75020
72 2 D11 D13 Led red LED, Red, SMD, 20
mA, 2 V, 625 nm Wurth Elektronik 150060RS75020
73 1 PCB Not
Reference FR4-4 Layer
FR4-4 Layer copper
thickess 35 micron
ext/Inter Layer
n.a. n.a.
UM3175
Bill of materials
UM3175 - Rev 1 page 20/27