ST X-NUCLEO-SNK1M1 User manual

Introduction
The X-NUCLEO-SNK1M1 expansion board allows evaluating the features of TCPP01-M12 and the USB Type-C® overvoltage
protection for VBUS and CC lines suitable for Sink applications.
The expansion board is designed to be stacked on top of any STM32 Nucleo-64 development board exploiting the
characteristics of the USB Type-C® and Power Delivery (UCPD) peripheral embedded in their microcontrollers.
It can also be stacked on other STM32 Nucleo development boards not supporting the UCPD peripheral to demonstrate the
USB Type-C® basic operations (attach, detach and power supply current capability recognition).
The X-NUCLEO-SNK1M1 provides an effective demonstration of the dead battery operation, thanks to the integrated
ST715PU33R LDO linear regulator that supplies the connected STM32 Nucleo development board when a Source is attached
via a USB Type-C® connector.
The X-NUCLEO-SNK1M1 is compliant with the latest USB Type-C® and Power Delivery specifications and is also USB-IF
certified as a 100 W solution supporting Programmable Power Supply (PPS) function.
The companion software package (X-CUBE-TCPP) contains the application examples for development boards embedding
UCPD-based microcontrollers (NUCLEO-G071RB, NUCLEO-G474RE and NUCLEO-G0B1RE) and for non-UCPD ones
(NUCLEO-L412RB-P).
Figure 1. X-NUCLEO-SNK1M1 expansion board
Note: Before running any demo, set CC1 J1, CC2 J2, JP3 and JP4 jumpers according to the configuration described in
Section 1.3 Demo application setup.
Getting started with the X-NUCLEO-SNK1M1 USB Type-C® Power Delivery Sink
expansion board based on TCPP01-M12 for STM32 Nucleo
UM2773
User manual
UM2773 - Rev 6 - August 2022
For further information contact your local STMicroelectronics sales office.
www.st.com

1Getting started
1.1 Overview
The X-NUCLEO-SNK1M1 expansion board features:
•On-board TCPP01-M12 protection for USB Type-C® and PD Sink applications
• Compliant with the latest USB Type-C® and Power Delivery specification, including the Programmable
Power Supply (PPS) feature
• USB-IF certified (Test ID certification: 5205)
• 100 W-rated solution
• 6 V overvoltage protection (OVP) on CC lines against short-to-VBUS when the connector is unplugged
• Up to 22 V adjustable overvoltage protection (OVP) on VBUS line against charger failure
• Surge protection (8/20 µs) and system-level ESD protection on VBUS
• Common mode filter and ESD protection on USB 2.0 High Speed data lines
• System level ESD protection on CC lines as per IEC61000-4-2 level 4 (±8 kV contact discharge)
• Low power mode for battery operation allowing zero current consumption when no cable is attached
• Integrated dead battery management when the device battery is fully depleted
• Overtemperature protection (OTP)
• RoHS compliant
1.2 Hardware architecture
The X-NUCLEO-SNK1M1 expansion board is designed to be used with any STM32 Nucleo-64 development
board embedding the UCPD peripheral (mainly NUCLEO-G071RB, NUCLEO-G474RE and NUCLEO-G0B1RE)
and also with the ones not supporting the UCPD peripheral.
Note: The compliance with the USB Type-C® and Power Delivery specification is guaranteed only for the STM32
Nucleo development boards embedding the microcontrollers (STM32G071RB and STM32G474RE) with a
UCPD peripheral.
When stacked with a non-UCPD STM32 Nucleo development board, the X-NUCLEO-SNK1M1 can still
demonstrate some USB Type-C® basic operations like ATTACH/DETACH recognition and identification of source
current capability.
Moreover, two couples of resistances, used as solder bridge selectors, allow exploiting the USB2.0 peripheral.
The expansion board must be plugged on the matching pins of the development board CN7 and CN10 ST
morpho connectors.
When plugged onto an STM32 Nucleo development board, the expansion board can be supplied in two different
ways:
• by the STM32 Nucleo ST-LINK supply using the development board internal LDO
• by the VBUS provided when a Source is plugged into the CN1 USB Type-C® connector and thanks to the
integrated ST715PU33R LDO linear regulator (U2) that supplies the entire system, which supports Dead
Battery operation mode.
UM2773
Getting started
UM2773 - Rev 6 page 2/23

Figure 2. X-NUCLEO-SNK1M1 main functional blocks (top view)
1. Morpho connector (CN7)
2. Arduino connector (CN6, CN8)
3. Reset jumper (JP4)
4. LDO OUT jumper (JP3)
5. 3V3 LED (LD2)
6. VBUS LED (LD1)
7. Power connector (CN2)
8. TCPP01-M12 USB-C overvoltage protection for VBUS and CC lines (U1)
9. BAT54K Schottky diode (D2)
10. CC1 line configuration jumper (J1)
11. CC2 line configuration jumper (J2)
12. USB data setting resistor (R12)
13. ECMF02-2AMX6 common-mode filter and ESD protection for USB 2.0 and MIPI/MDDI interfaces (U3)
14. USB Type-C® connector (CN1)
15. STL11N3LLH6 N-channel 30 V, 6 mOhm typ., 11 A STripFET H6 Power MOSFET (Q1)
16. Arduino connector (CN5, CN9)
17. Morpho connector (CN10)
18. USB data setting resistor (R8, R9)
19. USB data setting resistor (R13)
12
3
4
5
6
7
89
10
11
12
13
14
16
17
18
15
19
UM2773
Hardware architecture
UM2773 - Rev 6 page 3/23

Figure 3. X-NUCLEO-SNK1M1 main functional blocks (bottom view)
1. Morpho connector (CN10)
2. ESDA25P35-1U1M TVS diode (D1)
3. OVP threshold solder bridges (SH1, SH2, SH3, SH4, SH5)
4. ST715PU33R high input voltage LDO linear regulator (U2)
5. Morpho connector (CN7)
1
2
3
4
5
1.2.1 USB Type-C® connector
The USB Type-C® receptacle (CN1) gathers the VBUS path and the main connections, such as CC lines and
USB2.0 data lines (DP
, DM), before dispatching data to the major functional blocks.
Figure 4. Type-C receptacle (CN1) and ESDA25P35-1U1M TVS diode (D1)
VBUSc
GND
GND
GND
GND
CN1
GND4
B12
WE-632723300011
RX1+
B11
RX1-
B10
VBUS4
B9
SBU2
B8
B5
D-2
D+2
CC2
B4
B3
B2
B1
GND1 A1
VBUS3
TX2-
TX2+
GND3
TX1+ A2
TX1- A3
VBUS1 A4
CC1 A5
D+1 A6
A7
A8
A9
A10
A11
A12
B6
B7
D-1
SBU1
VBUS2
RX2-
RX2+
GND2
C2
330p
D1
ESDA25P35-1U1M
C1
330p
GND_C GND_C
VBUSc
CC1c
DM DP
DP DM
CC2c
VBUSc
GND_C GND_C
Note: VBUS path capacitive value should be included between 1 µF and 10 µF for a USBPD SINK port design.
An ESDA25P35-1U1M TVS diode has been integrated to protect the VBUS power line and, consequently, the
entire system against EOS and ESD transients when a Source is connected through the USB Type-C® cable.
UM2773
Hardware architecture
UM2773 - Rev 6 page 4/23

1.2.2 TCPP01-M12 USB Type-C® protection and VBUS overvoltage protection setup
TCPP01-M12 (U1) protects the CC1 and CC2 pins of the USB Type-C® and PD controller sink against
overvoltage in case a short-circuit event with the VBUS occurs during the attach or detach operation with a
defective tool.
The protection is implemented by removing the USB Type-C® cable from its receptacle.
Figure 5. TCPP01-M12 protection (U1) driving the STL11N3LLH6 MOS (Q1)
Connector
side
DB/
CC1
CC2
CC1c
CC2c
VCC
FLT
VBUS
VCC
GND
GND
GND
SH1 0 N.M.
D2
R3
10k
SH5
0 N.M.
U1
TCPP01_M12
6
VBUS_CTRL
3CC1 7
CC1c
1CC2 9
CC2c
DB/
10 FLT/ 11
GND
2
GND1
13
4
SOURCE
5
GATE
8
IN_GD
VCC
12
C3
R1_22V 620
SH3 0 N.M.
Q1
6
4
2
STL11N3LLH6
1 35
7 8
10k
CC1
CC2
CC1c
CC2c
VBUS
DB/
VBUSc
VBUS_CTRL
VBUS_CTRL
Controller
side
0 N.M.
0
R1_6V 2.7k
R1_10V 1.5k
R1_13V 1.1k
R1_17V 820
BAT54K
100n
R2
TCPP01-M12 overvoltage protection (OVP) threshold setup mechanism is based on a resistive network
composed of five resistors (R1_6V, R1_10V, R1_13V, R1_17V and R1_22V) and five solder bridges (SH1, SH2,
SH3, SH4, and the SH5). Connected to the device through the BAT54K signal Schottky diode (D2), this section is
shown in the figure above (left side) and is placed at the board bottom.
On the X-NUCLEO-SNK1M1 expansion board, the 22 V OVP threshold is set by default via SH5. To change the
threshold to another value (6, 10, 13 or 17 V), remove SH5 and add a different solder bridge on the selected OVP
voltage.
When a defective power source plugged onto the Type-C connector produces a voltage higher than the selected
OVP threshold, the TCPP01-M12 OVP mechanism controls the external MOSFET Q1 and interrupts the VBUS
line.
The current X-NUCLEO-SNK1M1 setup is compliant with the USB Type-C® and Power Delivery specifications. It
is certified by USB-IF, with TID certification no. 5205.
However, some USB Type-C® adapters and equipment, which are not compliant with the specification, might
latch the solution to overvoltage when connected to it. This is due to the generation of an initial spike that is very
close to the OVP upper limit.
In such occurrences, we suggest replacing the resistance values according to the values reported in the table
below, in the “Recommended resistor” column.
Table 1. Resistor values
VBUS max Pmax Resistor reference Onboard values (mounted) Recommended values for noncompliant
adapters
6 V 15 W R1_6V 2.7 k 2.4 k
10 V 27 W R1_10V 1.5 k 1.27 k
13 V 36 W R1_13V 1.1 k 910 k
17 V 45 W R1_17V 820 k 715 k
22 V 100 W R1_22V 620 k 536 k
This new set of resistors still filters against voltage spike at startup, but do not latch the OVP.
UM2773
Hardware architecture
UM2773 - Rev 6 page 5/23

You can use several Q1 MOSFET references with various tradeoffs on the key parameters: the size for the PCB
surface, RDS(on) for the static drain-source on-resistance insertion losses and VDS for the maximum drain-source
voltage when the surge is clamped by the TVS diode (D1).
The dual Q1 MOSFET (back-to-back configuration) is required if the voltage is maintained on the consumer path
when there is no VBUS voltage.
Table 2. N-MOSFET performance tradeoff
Order code N-MOSFET Package RDS(on) typ. VDS max.
STL6N3LLH6 Single PowerFLAT 2x2 Single island 32 mΩ 30 V
STL11N3LLH6 Single PowerFLAT 3.3x3.3 Single island 8.4 mΩ 30 V
STL260N4LF7 Single PowerFLAT 5x6 Single island 1.2 mΩ 40 V
STL40DN3LLH5 Dual PowerFLAT 5x6 Dual island 20 mΩ 30 V
STL105DN4LF7AG Dual PowerFLAT 5x6 Dual island 5.3 mΩ 40 V
1.2.3 CC lines and configuration jumpers
Two headers for jumpers (J1 and J2) have been integrated to change the CC lines paths from the TCPP01-M12
protection to the ST morpho connectors (CN7 and CN10) on the STM32 Nucleo development board, setting them
differently according to the peripheral mapping of the STM32 microcontroller.
This integration guarantees the solution flexibility support for the demo across the STM32 Nucleo-64 development
board range.
Figure 6. CC line configuration jumpers
CC1
CC2
GND
GND
R21
5.1k
0
R16 100
0R18
J4
R15
0R19
R17
5.1k
0R22
J3
R20 100
J1
1
JUMPER
2
3
J2
1
JUMPER
2
3
CC1_G4
CC1_G0
CC2_G4
CC1_no_UCPD
CC2_no_UCPD
CC2_G0
R14
0
Jumper-Female
Jumper-Female
The table below shows the jumper settings to configure the X-NUCLEO-SNK1M1 to work with the STM32 Nucleo
development boards embedding the UCPD peripherals (NUCLEO-G071RB, NUCLEO-G474RE and NUCLEO-
G0B1RE) as well as with other STM32 Nucleo-64 boards (NUCLEO-L412RB-P) implementing the USB Type-C®
attach-detach recognition mechanism.
UM2773
Hardware architecture
UM2773 - Rev 6 page 6/23

Table 3. J1 and J2 CC lines configuration setting jumpers
Compatible STM32 Nucleo
boards
Jumpers
CC1 - J1 CC2 -J2
Any STM32 Nucleo-64
development board with
UCPD (NUCLEO-G071RB,
NUCLEO-G474RE and NUCLEO-
G0B1RE)
Any STM32 Nucleo-64
development board without UCPD
(NUCLEO-L412RB-P)
When both configuration jumpers (J1 and J2) are set to positions 1-2, the board is compatible with NUCLEO-
G071RB, NUCLEO-G474RE and NUCLEO-G0B1RE offering the UCPD peripheral.
This association permits to fully demonstrate the main characteristics of the USB Type-C® and Power Delivery
standards implemented by the demo application example.
When J1 and J2 are both set to positions 2-3, the X-NUCLEO-SNK1M1 can match any STM32 Nucleo-64
development board, demonstrating the basic mechanism of the Type-C specification, thanks to two pull-down
resistors (R17 and R21) connected to the pins working as CC lines, allowing the Sink USB Type-C® operations to
run with any attached Source.
1.2.4 USB 2.0 data path and configuration setting
The X-NUCLEO-SNK1M1 expansion board allows STM32 Nucleo development boards that feature a USB2.0
peripheral to expose the D+/D- lines on the USB Type-C® receptacle (CN1).
Most STM32 Nucleo-64 development boards feature this functionality on the ST morpho connector CN10-12 and
CN10-14 pins, whereas NUCLEO-L412RB-P, NUCLEO-L433RC-P, NUCLEO-L452RE-P and NUCLEO-L476RG
boards map USB2.0 data pins on CN10-33 and CN10-17 pins.
Two couples of resistances has been implemented and connected to the ECMF02-2AMX6 (U3) USB2.0 data lines
protection to extend the use of this peripheral to all the STM32 Nucleo-64 development boards.
Figure 7. USB2.0 data lines protection ECMF02-2AMX6 (U3) and resistor setup
ZDiff 90 Ohm
DP_Gx_Fx
DM_Gx_Fx
DP_Lx
DM_Lx
GND
N.M.
U3
1DP1
ECMF02_2AMX6
2DM2
3GND 4
NC
5
DM5
6
DP6
0R12
N.M.
DP
DM
R8 0
R9 0
R13 0
ZDiff 90 Ohm
UM2773
Hardware architecture
UM2773 - Rev 6 page 7/23

By default, the X-NUCLEO-SNK1M1 board mounts R8 and R9 resistors fitted to guarantee USB2.0 compatibility
to all the main microcontroller families, but, for the L4 family (NUCLEO-L412RB-P, NUCLEO-L433RC-P,
NUCLEO-L452RE-P and NUCLEO-L476RG) only, they have to be removed and replaced by R12 and R13 solder
bridges.
1.2.5 ST morpho and Arduino UNO V3 connectors
The figure below shows the X-NUCLEO-SNK1M1 expansion board ST morpho and Arduino UNO V3 connectors,
detailing the main connections, functions and configuration settings.
Figure 8. ST morpho and Arduino UNO V3 connectors
VCC FLT
VBUS
DP_Gx_Fx
DM_Gx_Fx
DP_Lx
DM_Lx
3.3V
GND
GND
GND
GND
3.3V
1 2
34
5 6
7 8
9 10
11 12
13
15 16
26
19 20
21 22
23 24
25
27 28
30
31 32
33 34
36
37 38
R6
40.2k
CN6
1
2
3
61300811821
5
6
7
8
CN9
1
2
4
5
6
7
8
R23 0
N.M.
R7
200k 0R24
CN5
1
2
4
5
6
7
8
9
CN8
1
2
3
5
6
CN7
1 2
4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
23 24
25 26
27 28
31 32
33 34
35 36
D15
VDD E5V
D14
BOOT0 GND
AVDD U5V
NC/
GND
IOREF
D13
D12
RESET NRST
+3V3
D11
+5V
CC1_G4
D10
FLT_IN
GND GND
D9 GND
D6
DB_OUT
CC2_G0
A0
A1
D4
A2 AGND
A3
D2
A4
D1
A5
D15
NC/ D14
IOREF AVDD
RESET GND
+3V3 D13
+5V D12
GND D11
GND D10
VIN
D8
D7
A0
D5
A2
A3
D3
A4
A5
D1
D0
ADC_VBUS
VCC_OUT
FLT_IN
VCC_OUT
3
19
21
29
37
20
22
30
38
GND
VIN
A0
A2
A5
CC1_no_UCPD
CC2_no_UCPD
ADC_VBUS
R27
0
4
ESQ-119-24-T-D
A1
A2
A4
4
61300811821
61300811821
61300811821
3
D9
D6
3
ESQ-119-24-T-D
14
17 18
29
35
CN10
R22 0
In addition to the main functions related to the USB Type-C® and Power Delivery specification:
•an ADC channel can be used to monitor the VBUS voltage (ADC_VBUS)
• a supply option path allows supplying the TCPP01-M12 either via the 3.3 V provided by the STM32 Nucleo
development board or via a GPIO on the ST morpho connector (CN7-1). You can select the path through
R23 and R24 resistances. This option, combined with the TCPP01-M12 low consumption, is useful for
battery-powered devices as the TCPP01-M12 can be powered only when an attachment is detected (low-
power mode)
• the TCPP01-M12 fault report pin (open drain) is connected to the ST morpho connector pin (CN10 – 18) to
be monitored by the STM32 microcontroller (FLT – FLT_IN path)
1.2.6 Indication LEDs
Two LEDs mounted on the X-NUCLEO-SNK1M1 top side indicate the supply status of the expansion board and
the stacked STM32 Nucleo development board:
•the red LED (LD1) turns ON when a source application board is plugged to the X-NUCLEO-SNK1M1 CN1
connector and the USB Type-C® VBUS voltage is present;
• the green LED (LD2) indicates that the 3.3 V is present and is supplying the STM32 Nucleo microcontroller
development board.
UM2773
Hardware architecture
UM2773 - Rev 6 page 8/23

Figure 9. Indication LEDs
3.3V
GND GND
R5
LD1
AC
150060RS75000
3.9k
LD2
AC
VBUS
Red LED
Green LED
3.3V
VBus
R4
150060GS75000
1k
1.2.7 Dead battery mode configuration jumpers and internal LDO
Thanks to the dead battery feature, described by the USB Power Delivery specification and implemented by the
X-NUCLEO-SNK1M1, it is possible to directly power the system through the VBUS provided by a Source, as an
alternative mode to the standard supply through the STM32 Nucleo ST-LINK.
Note: Before configuring the X-NUCLEO-SNK1M1 to operate in dead battery mode, check whether the supply
selection jumpers on the STM32 Nucleo board have been removed:
• on the NUCLEO-G071RB and the NUCLEO-G0B1RE, remove the jumper from JP2 header
• on the NUCLEO-G474RE, remove the jumper from JP5 header 5V_SEL
• on the NUCLEO-L412RB-P, remove the jumper from JP5 header
Figure 10. Dead battery mode circuitry
DB/
3.3V
GND
3.3V
CN10
C6
1u
U2
NC
2
ST715PU33R
GND 4
1
Vin 3
8
6
FB
5
7
9
EXP
J5
J6
N.M.
C5
220n
VBUS
LDO_OUT
LDO_OUT
NRST
DB_OUT
Jumper-Female
JP3 JUMPER-con2 strip-male
JP4
JUMPER-con2 strip-male
Jumper-Female
R25 0
R26 0
To select the dead battery operation mode on the X-NUCLEO-SNK1M1, JP3 and JP4 jumpers must be fit.
Table 4. JP3 and JP4 power mode selection jumpers
Power mode
Jumpers
JP3 (LDO_OUT) JP4 (RESET)
ST-LINK powered mode
(open) (open)
UM2773
Hardware architecture
UM2773 - Rev 6 page 9/23

Power mode
Jumpers
JP3 (LDO_OUT) JP4 (RESET)
Dead battery mode
(fit) (fit)
JP3 jumper connects the VBUS path from the Type-C connector to the LDO (U2) which is connected to the STM32
Nucleo development board 3.3 V path and can power the entire solution.
When fitted, JP5 jumper forces the STM32 I/O negative reset to level 1. It must be connected when the STM32 is
powered by the X-NUCLEO-SNK1M1.
By default, the TCPP01-M12 dead battery option has been set to be driven by an STM32 microcontroller pin
through R26 solder bridge, thus removing the TCPP01-M12 dead battery clamp when GPIO is connected on ST
morpho connector (CN10-24). The alternative operating mode is to fit the TCPP01-M12 dead battery option to
3V3 through the R25 mounting solder bridge (consequently, R26 must be not fitted).
In the application firmware package, this option has been included in the firmware examples where a GPIO (ST
morpho CN10-24) properly drives the dead battery option.
1.2.8 Power connector
CN2 power connector can be used to connect a load and monitor the VBUS voltage level negotiated by the system
with a Source attached to CN1 USB Type-C® connector.
Figure 11. CN2 power connector
CN2
1
2
VBUS
GND
691210910002
Note: To monitor the output voltage, an appropriate resistance has to be connected to the X-NUCLEO-SNK1M1 CN2.
1.3 Demo application setup
The X-NUCLEO-SNK1M1 expansion board flexibility permits to demonstrate the TCPP01-M12 protection features
and capabilities with a wide range of STM32 Nucleo development boards.
The X-CUBE-TCPP companion software package contains specific application examples for the STM32 Nucleo
embedding the USB Type-C® and Power Delivery management (NUCLEO-G071RB, NUCLEO-G474RE and
NUCLEO-G0B1RE) and, for the ones without the UCPD peripheral, the package demonstrates how to comply
with basic USB Type-C® operations (NUCLEO-L412RB-P).
1.3.1 Programming and debugging
Once the X-NUCLEO-SNK1M1 expansion board has been connected to a NUCLEO-G071RB, NUCLEO-
G474RE, NUCLEO-G0B1RE or NUCLEO-L412RB-P, to program and debug, the STM32 Nucleo development
board has to be connected to a laptop by the embedded USB ST-LINK connector (CN2) to supply the solution
and program the firmware example in the application microcontroller.
UM2773
Demo application setup
UM2773 - Rev 6 page 10/23