ST STEVAL-2STPD01 User manual

Introduction
The STEVAL-2STPD01 is an evaluation kit composed of an expansion board containing two Type-C ports and integrating
two STPD01PUR programmable buck converters for USB Power Delivery, and the NUCLEO-G071RB STM32 Nucleo-64
development board.
The kit exploits the characteristics of the STPD01PUR programmable buck regulator controlled through I²C interface, and the
UCPD peripheral embedded in the STM32G071RBT6 microcontroller supported by a dedicated firmware stack to implement a
USB Type-C and PD dual port source adapter with power sharing capability.
Once the input power rate is fixed, the kit is able to balance the power on the two ports, supporting the requests sent by the
USB PD devices connected to each port.
Taking advantage of STPD01PUR characteristics to output several voltage levels, the solution is able to manage up to 120 W
(60 W for each port) according to the DC input power.
The expansion board has been specifically developed to be stacked on the NUCLEO-G071RB development board using the
capability of its microcontroller to manage two UCPD peripherals at the same time. It also embeds the TCPP02-M18 USB
Type-C port protection for Source applications and the L7983PU50R synchronous step-down switching regulator.
To fully demonstrate the USB Type-C and Power Delivery functionalities of the solution, the STSW-2STP01 software package,
containing the demo application example, has been designed for the NUCLEO-G071RB STM32 Nucleo development board.
The solution is compliant with USB Type-C 2.1 and PD 3.1 specifications.
Figure 1. STEVAL-2STPD01 evaluation kit
Getting started with the STEVAL-2STPD01 USB Type-C™ Power Delivery dual
port adapter based on the STPD01 programmable buck converter
UM2880
User manual
UM2880 - Rev 1 - November 2021
For further information contact your local STMicroelectronics sales office. www.st.com

1Getting started
1.1 Overview
The STEVAL-2STPD01 features:
• Two USB Type-C and Power Delivery Source ports
• Output power up to 120 W-rated (60 W per port), managed through power sharing algorithm
• Up to four output PDOs for each port (5 V@3 A, 9 V@3 A, 15 V@3 A, 20 V@3 A)
• Compliant with USB Type-C 2.1 and PD 3.1 specifications
• Two STPD01PUR DC-DC converters dynamically set by I²C, suitable to implement power sharing in USB
PD applications
• Two on-board TCPP02-M18 protections for USB Type-C and PD Source applications
• OVP, UVP, OC, short-circuit and OTP protections
• Surge protection (8/20 µs) and system level ESD protection on VBUS
• System level ESD protection on CC lines as per IEC61000-4-2 level 4 (±8 kV contact discharge)
• RoHS compliant
1.2 System architecture
The STEVAL-2STPD01 evaluation kit architecture can be divided into two sub-systems:
• a digital stage represented by a NUCLEO-G071RB STM32 Nucleo-64 development board embedding the
STM32G071RBT6;
• a power stage represented by an expansion board, that physically manages, redirects and converts the
input supply to the kit main functional blocks, contributing also to output the expected voltages.
Figure 2. STEVAL-2STPD01 evaluation kit: NUCLEO-G071RB development board and expansion board
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Getting started
UM2880 - Rev 1 page 2/41

Figure 3. STEVAL-2STPD01 architecture block diagram
BUS
Programmable DC-DC
STPD01
Type-C & PD Controller
STM32G0
Controls
(I2C, GPIOs)
Programmable DC-DC
STPD01
V
CCs
Pmax
60W
Pmax
60W
DC input section
Type-C Port
Protection
TCPP02
Controls
(I2C, GPIOs)
Controls
(I2C, GPIOs)
Load
Switch
CCs
Type-C Port
Protection
TCPP02
Load
Switch
Controls
(I2C, GPIOs)
CCs
CCs
Aux Voltages
L7983
LDL112
Expansion board
NUCLEO-G071RB
Port 0
Port 1
Type-C
Type-C
BUS
V
1.2.1 NUCLEO-G071RB development board
The NUCLEO-G071RB STM32 Nucleo-64 development board is based on the high-performance Arm® Cortex®-
M0+ 32-bit RISC core operating at up to 64 MHz frequency, with 128 Kb Flash memory and 16 Kb SRAM.
The ST morpho headers allows expanding the functionality of the STM32 Nucleo open development platform with
a wide choice of specific shields.
The STM32 Nucleo-64 boards do not require any separate probe as they integrate the ST-LINK/V2-1 debugger/
programmer. They embed comprehensive free STM32 software libraries and examples available with the
STM32CubeG0 MCU package.
Note: The NUCLEO-G071RB is compliant with the USB Type-C and Power Delivery specification thanks to the UCPD
peripheral embedded in its STM32G071RBT6 microcontroller.
RELATED LINKS
Refer to the related ST web page NUCLEO-G071RB bill of materials and schematic diagrams
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System architecture
UM2880 - Rev 1 page 3/41

1.2.2 Expansion board
Figure 4. Expansion board schematic diagram main blocks
D_VDD
D_VDD
D_VDD
D_VDD
D_VDD
GND GND_MAIN
GND_Sign0 GND_PWR0
GND
GND
GND_Sign1 GND_PWR1
GND_Sign1
GND_Sign0 GND_PWR0
GND_Sign1
GND_Sign1 GND_PWR1
GND_PWR0
GND_PWR1
GND
GND_Sign0
GND_MAIN
GND_MAIN
GND_MAIN
GND_MAIN
GND_Sign0
GND_Sign1
GND_Sign0
GND
JP801
SHORT
C801
CAP
05 05 Protection + Type-C conn.
I2C_SCL I2C_SDA A_VDD D_VDD
ISENSE_Px
FLGn_TCPP02_Px
CC2_Px
BUSx
ADDR_TCPP02_Px
VBUSx_M
CC1_Px
GND_Pwr GND_Sign
EN_TCPP02_Px
04
04 Power Block
VOUTVIN_24V
I2C_SDA I2C_SCL D_VDD
EN_STPD01_Px
ALRT_STPD01_Px
ADD_STPD01_Px
CSENS_STPD01_Px
Pon_STPD01_Px
A_VDD GND_Pwr GND_Sign
R801
0N.M.
R803
0N.M.
03
03 Morpho connectors
CC2_P1
VSYS
CC1_P1 ISENSE_P1
CC1_P0 CC2_P0
VBUS0_M
ISENSE_P0
VBUS1_M
I2C_SCL
I2C_SDA
EN_STPD01_P1 EN_STPD01_P0
D_VDD
A_VDD
24V_SENSE
FLGn_TCPP02_P0FLGn_TCPP02_P1
ALRT_STPD01_P0ALRT_STPD01_P1
CSENS_STPD01_P0CSENS_STPD01_P1
Pon_STPD01_P1 Pon_STPD01_P0
EN_TCPP02_P1 EN_TCPP02_P0
GND_Sign
R808
0N.M.
R806
0N.M.
C800
CAP
06
06 Power Block
VOUTVIN_24V
I2C_SDA
I2C_SCL
D_VDD
EN_STPD01_Px
ALRT_STPD01_Px
ADD_STPD01_Px
CSENS_STPD01_Px
Pon_STPD01_Px
A_VDD
GND_Pwr
GND_Sign
07 07 Protection + Type-C conn.
I2C_SCL
I2C_SDA
A_VDD
D_VDD
ISENSE_Px
FLGn_TCPP02_Px
CC2_Px
BUSx
ADDR_TCPP02_Px
VBUSx_M
CC1_Px
GND_Pwr
GND_Sign
EN_TCPP02_Px
JP804
SHORT
JP800
SHORT
R800
0
J801
CON2
1
2
R805
4.7k
R802
0
02
02 DC Input Section
V_PLUG
GND
VDD_5V
24V_Sense
24V
JP802
SHORT
J800
DC_POWER_JACK
2
3
1
R804
4.7k
JP803
SHORT
R807
0
R809
0
VDD_5V
D_VDD
A_VDD
VDD_5V VDD_5V
As shown in the figure above, the expansion board schematic diagram integrates four main functional blocks, of
which two are duplicated to implement the Dual Port functionality:
1. the input power section block (02) that manages the input power to supply all other devices. It features a
plug and a screwed connector and integrates the L7983PU50R synchronous step-down switching regulator;
2. the morpho connector block (03) that routes the signal path from the stacked NUCLEO-G071RB
development board;
3. the USBPD power blocks (04 and 06) which integrate the STPD01PUR programmable buck converters for
USB Power Delivery;
4. the protection and Type-C connector blocks (05 and 07) which integrate the TCPP02-M18 USB Type-C port
protection devices for Source applications.
The STM32G071RBT6 embedded in the NUCLEO-G071RB development board uses the I²C peripheral to
configure and manage both the STPD01PUR converters and the TCPP02-M18 protections, connecting them
through the morpho connectors.
Indeed, the power blocks (04 and 06) and the protection and Type-C connector blocks (05 and 07) report the I²C
addressing setup of each port, referring to the STPD01PUR and the TCPP02-M18 devices.
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System architecture
UM2880 - Rev 1 page 4/41

Figure 5. Expansion board main functional blocks (top view)
1. ST morpho connectors (CN300, CN301)
2. STPD01PUR programmable buck converter for USB Power Delivery (U400, U600)
3. TSV991AILT rail-to-rail op-amp (U401, U501, U601, U701)
4. TCPP02-M18 Type-C port protection for Source (U500, U700)
5. STL11N3LLH6 N-channel 30 V, 11 A STripFET H6 Power MOSFET (Q500, Q501, Q700, Q701)
6. STL9P3LLH6 P-channel 30 V, 9 A STripFET H6 Power MOSFET (Q200)
7. L7983PU50R 60 V, 300 mA synchronous step-down switching regulator (U200)
8. Type-C connector (CN500, CN700)
9. ESDA25P35-1U1M high-power transient voltage suppressor (D500, D700)
10. SMM4F28A 400 W, 28 V TVS (D200)
11. DC power connector (J801)
12. DC power jack (J800)
13. Indication LEDs (D400, D401, D600, D601)
1
2
4
5
10
3
12
11
6
7
98
13
1.2.2.1 Input power section
When the two boards are stacked, the kit can be supplied through one of the two DC power connectors (J800 and
J801), depending on the capabilities of the power supply.
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System architecture
UM2880 - Rev 1 page 5/41

Note: The J800 power jack connector is able to sustain up to 5 A, while the J801 power connector is able to sustain
more than 5 A.
Figure 6. Input power connectors (J800 and J801)
GND_MAIN
GND_MAIN
J801
CON2
1
2
02
02 DC Input Section
V_PLUG
GND
VDD_5V
24V_Sense
24V
J800
DC_POWER_JACK
2
3
1
Note: The STEVAL-2STPD01 has been designed to target 120 W output power when the input source is a DC power
supply with 24 V and 6 A capability at least. This type of power supply has to be connected to J801 power
connector.
As shown in the following figure, the first stage of the input power section manages the input voltage through
a filtering stage (composed of C200, L200, C201) and protections (D200 and Q200) to make it available
to the whole solution: the input voltage (labelled 24V_Input on the schematics) directly supplies the two
STPD01PUR devices for the USBPD VBUS generation on each port (04 and 06 blocks shown in Figure 4),
and the L7983PU50R switching regulator that generates the voltage supply for the digital stage.
Figure 7. Input power section
24V1^,4,5V_PLUG 1^
GND 1^
24V_Sense 1^,3
C200
10uF
R204
13k
R200
100k
+
C201
22uF
12
R203
20k
R201
91k
Q200
STL9P3LLH6
6
4
2
1
3 5
7
8
C203
0.22uF
J200
con2-strip-male
1 2
TP200
5001
D200
SMM4F28A
D201
LED RED
AC
TP201
5001
R202
210k
C202
220uF
N.M.
L200
BNX002-11
1 2
3
5
6
4
TP202
5001
24V_Input
J200 jumper drives the MOS and sets the input voltage path on continuity, thus maintaining the external power
plug attached to the input connectors and disabling the supply even if still connected to the kit plug.
Moreover, a sensing stage has been integrated with R201/R204 voltage dividers. One channel of the ADC
peripheral in the STM32G071RBT6 microcontroller is used to monitor the input voltage path.
When this section is supplied and a jumper is set on J200 header, D201 red LED turns on signaling the kit is
powered.
The L7983PU50R switching regulator has been integrated to convert the DC input voltage and supply the
NUCLEO-G071RB development board.
UM2880
System architecture
UM2880 - Rev 1 page 6/41

Figure 8. L7983PU50R stage
VDD_5V
1^,3
R206
0
L201
47uH
1 2
C206
0.47uF
C205
0.1uF
R207
51k
C204
2.2uF
C207
1uF
R205
0
R208
0N.M.
R209
0N.M.
U200L7983PU50R
VBIAS 2
EN/UVLO
7
VIN
8
RST
6
FSW 4
LNM/LCM 5
VCC 3
LX
9
EP
11
GND
10 VOUT/FB 1
VDD_5V
VCC
VDD_5V
VCCVCC
24V_Input
The L7983PU50R can deliver up to 300 mA DC, with a wide input voltage range (from 3.5 V up to 48 V).
The device features dynamic low consumption mode (LCM) to low noise mode (LNM) transitions.
LNM, set by mounting R206 pull-up, makes the switching frequency constant, meeting the low noise application
specification, whereas LCM is designed for applications active during idle mode to maximize the efficiency at light
load with controlled output voltage ripple.
Note: The NUCLEO-G071RB development board can be powered by the external 5 V coming from the expansion
board, when a jumper fits pins 5-6 in JP2 header or, alternatively, by CN2 USB_STLINK connector, fitting a
jumper on pins 1-2 of the NUCLEO-G071RB JP2 header. In the second case, by connecting the board to
a laptop with the STM32CubeMonUCPD installed, it is also possible to exploit the development board serial
communication to monitor the USBPD messages exchanged by the kit with one or two attached Sink platforms.
1.2.2.2 Morpho connectors
CN300 and CN301 morpho connectors interconnect the two boards allowing the STM32G071RBT6
microcontroller to control the expansion board functionalities and to be supplied by an external power source.
Figure 9. CN300 and CN301 morpho connectors
CC2_P11^
VSYS1^,2
CC1_P1 1^
CC1_P0 1^
CC2_P01^
VBUS0_M1^
ISENSE_P01^
VBUS1_M1^
Pon_STPD01_P0 1^
Pon_STPD01_P1 1^
I2C_SCL 1^,4,5,6,7
I2C_SDA 1^,4,5,6,7
EN_STPD01_P1
1^,5
EN_TCPP02_P0
1^
EN_TCPP02_P1
1^
D_VDD
1^,4,5
A_VDD
1^,4,5,6,7
24V_SENSE 1^,2
ALRT_STPD01_P11^
ALRT_STPD01_P01^
FLGn_TCPP02_P11^
FLGn_TCPP02_P01^
CSENS_STPD01_P0 1^
CSENS_STPD01_P1 1^
EN_STPD01_P0 1^,4
ISENSE_P11^
GND_Sign
1^
GND GND
GND GND
GND
GND
CN301
ESQ-119-24-T-D
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
CN300
ESQ-119-24-T-D
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
0
FB1
600Ohm@100MHz
1 2
PC10 PC11
PC9 PC8
PC12 PD2
PB8 PC6
VDD E5V
PB9 PA3
PA14 GND
AVDD U5V
PD0 PD1
GND PD6
PD3 IOREF
PA5 PA12
PA13 RESET
PA6 PA11
PD4 +3V3
PA7 PC1
PA15 +5V
PB0 PC0
GND GND
PC7 GND
PB7 GND
PB2
PC13 VIN
PA8 PB6
PC14 PD5
PB14 PB15
PC15 PA0
PB4 PB10
PF0 PA1
PB5 PB13
PF1 PA4
PB3 AGND
VBAT PB1
PA10
I2C_SDA PA2
PB11/PB9
PC4 PD8
PC3 PB12/PB8
PC5 PD9
PC2
PA9
I2C_SCL
1.2.2.3 USBPD power block
The USBPD power blocks are the expansion board key sections as they permit to deliver the correct power to the
attached Sink paired ports once the negotiation with the PD controller is completed.
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System architecture
UM2880 - Rev 1 page 7/41

The STPD01PUR programmable buck converters (U400 and U600) constitute the core of these blocks. These
devices, controlled by the STM32G071RBT6 microcontroller through I2C communication and GPIOs, set the
correct level of voltage and current every time a new power negotiation is accomplished with a Sink platform
connected to a port Type-C connector (P0 or P1).
The figure below shows the STPD01PUR setup for port P0 (for analogy, the stage is repeated for port P1).
Figure 10. STPD01 USBPD programmable buck converter (U400, for port P0)
VOUT
1^,6
VIN_24V 1^,2
I2C_SDA
1^,3,5,6,7
I2C_SCL
1^,3,5,6,7
ADD_STPD01_Px
1^
GND_Sign1^
GND_Pwr1^
GND
GND
GND
R400
25mOhms
TP401
5001
U400
STPD01
VDRIVEH 6
PVIN8
8
PVIN9
9
VCC
7
ADD
3
PGND10
10
PGND11
11
SGND
24
ISNS+ 19
ISNS- 20
LX13 13
LX14 14
BOOT 16
INT
4
EN
5
CDC
22
SDA
1SCL
2
VSNS 21 VREG
18
LX15 15
Pon
17
NC 23
PGND12
12 EXP_PAD
25
C415
10uF
N.M.
TP402
5001
TP403
5001
R403
24k
C400
1uF
C405
10uF
C403
68uF
C407
47uF
C411
10000pF
C409
1uF
TP404
5001
C402
0.1uF
C401
0.1uF
C414
10uF
TP400
5001
L400
10uH
1 2
C404
68uF
N.M.
C408
0.1uF
C406
68uF
N.M.
R402
10k
R401
0
C410
1uF
TP405
5001
Pon_STPD01_Px
ENB_STPD01_Px
I2C_SCL
I2C_SDA
ALT_STPD01_Px
ADR_STPD01_Px
ISNS-_x
PHASE_x
ISNS+_x
ISNS+_x ISNS-_x
VBUS_PxVA_x
CDC_STPD01_Px
24V_Input
The STPD01PUR ENABLE pin (EN) is driven by the microcontroller to enable the device startup and,
consequently, its I2C communication interface. The microcontroller sets the STPD01PUR registers via I2C
commands and, at startup, the VOUT level to the default voltage value.
After startup, the Power-on (Pon) pin is high if the value is within ±5% of the regulation point. This event on Pon
pin is also monitored by the microcontroller.
The STPD01PUR Interrupt pin (INT) triggers the STM32 microcontroller providing notifications related to the
watchdog functionalities (OVP, OTP, SCP,etc.). These notifications shall be read by the microcontroller through
I2C communication as well.
The output voltage on the STPD01PUR CDC pin is managed by the conditioning stage (shown in Figure 11),
before being acquired by the microcontroller to monitor the output current.
Figure 11. STPD01PUR CDC conditioning stage
CSENS_STPD01_Px1^
A_VDD
1^,3
GND
GND
GND
TP407
5001
-
+
U401
TSV991AILT
3
4
1
52
R411
100K
R412
100K
C412
0.1uF
C413
0.22uF
R407
0
CDC_STPD01_Px
For each USBPD power block, two LEDs mounted on the expansion board top side provide clear information on
the STPD01PUR status as shown in Figure 12:
•when the microcontroller sets high the STPD01PUR EN pins, the associated device immediately switches
on after the startup sequence, turning on D400 (EN0) and D600 (EN1) green LEDs, respectively;
• when the STPD01PUR Pon pin is high, D401 (PWR0) and D601 (PWR1) blue LEDs turn on, indicating the
device is providing the right value of output voltage (within ±5% of the regulation point).
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System architecture
UM2880 - Rev 1 page 8/41

Figure 12. D400 and D401 indicator LEDs (for port P0)
VCC_3.3V
VCC_3.3V
GND GND
D401
LED BLUE
AC
R409
1.2k
R410
3.3k
D400
LED GREEN
AC
Q401
2N7002E-T1-GE3
3
1
2
Q400
2N7002E-T1-GE3
3
1
2
Pon_STPD01_Px ENB_STPD01_Px
1.2.2.4 Protection and Type-C connector block
The last section of the expansion board contains the TCPP02-M18 (U500 and U600) USB Type-C protections
and the receptacles (CN500 and CN700) which gather the VBUS path and the CC lines after dispatching from the
major functional blocks and morpho connectors.
The TCPP02-M18 is a source protection solution for USB Type-C applications that integrate overvoltage,
overcurrent, discharge protections required for VBUS path and CC lines.
The TCPP02-M18 setup on port P0 is shown in the figure below (for analogy, the stage is repeated for port P1).
Figure 13. TCPP02-M18 protection (U500) on port P0
CC2_Px1^
CC1_Px1^
EN_TCPP02_Px1^
I2C_SDA
1^,3,4,5,7
FLGn_TCPP02_Px
1^
I2C_SCL
1^,3,4,5,7
D_VDD 1^,4,5
ADDR_TCPP02_Px
1^
DVDD
C503
200pF
50V
U500
TCPP02-M18
VBUSc 8
CC1 2 CC1c
13
CC2 4
CBIAS
12
SRC 7
Isense 9
GND2
14
GND1
10 IANA 5
GATE 6
EN 1
VCC 3
CC2c
11
I2C_ADD
15
SDA
16
SCL
17
EP_GND
19
FLGn
18
C502
0.1uF
C501
200pF
50V
R501
10K
Isense
SRC
GATE
Px_Iana
CC2c_Px
DVDD
CC1c_Px
ENB_TCPP02_Px
DVDD
VBUSc
The TCPP02-M18 provides overvoltage protection on CC1 and CC2 pins in case a short-circuit occurs when
plugging/removing the USB Type-C cable from its receptacle.
The TCPP02-M18 ENABLE pin is driven by the microcontroller.
When the device is enabled, it controls the two N-channel MOSFET (Q500 and Q501) representing the load
switch on port P0 VBUS path as shown below (for analogy, the stage is repeated for port P1 port).
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Figure 14. VBUS path load switch based on STL11N3H6 (Q500 and Q501) driven by TCPP02-M18
BUSx 1^,4
D500
ESDA25P35-1U1M
Q501
STL11N3LLH6
6
4
2
1
3 5
7
8
R500
10mOhms
TP500
5001
Q500
STL11N3LLH6
6
4
2
1
35
7
8
C500
4.7uF
50V
BUSx VBUSx VBUSx
SRC GATE
VBUSc Isense
Moreover, the device measures the current on the VBUS through an external resistor (R500 or R600) and on
the path through two pins (Isense and VBUSc) connected to an internal integrated operational amplifier, detecting
overcurrent events and acting on the load switch to open the VBUS path.
An additional monitoring of the VBUS path is performed through the current and voltage sense conditioning stage,
thanks to the TSV991 operational amplifier (U501). The stage can be also bypassed by mounting the resistances
(R502 on port P0, R702 on port P1) and removing the solder bridges (R504 on port P0, R704 on port P1).
Figure 15. Current and voltage conditioning stage
VBUSx_M 1^
ISENSE_Px1^
A_VDD
1^,3
GND
GND
GND
R507
50K
C505
0.22uF
-
+
U501
TSV991AILT
3
4
1
52
R509
0
R504
0
R505
16K
R502
0
N.M.
C504
0.1uF
R506
100K
R503
91K
VBUSx
VBUSx_M Px_Iana
To assure further protection on the VBUS power line and, consequently, the entire system against EOS and ESD
transients, when a Sink is connected through the USB-C cable, an ESDA25P35-1U1M TVS diode has been
integrated.
The VBUS power lines are connected to the Type-C connectors: CN500 receptacles for port P0 (as shown below)
or CN700 for port P1.
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System architecture
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Figure 16. Type-C receptacle (CN500)
R508
180
N.M.
CN500
WE-632723300011
GND4
B12
RX1+
B11
RX1-
B10
VBUS4
B9
SBU2
B8
CC2
B5
VBUS3
B4
TX2-
B3
TX2+
B2
GND3
B1
GND1 A1
TX1+ A2
TX1- A3
VBUS1 A4
CC1 A5
D+1 A6
D-1 A7
SBU1 A8
VBUS2 A9
RX2- A10
RX2+ A11
GND2 A12
D+2
B6 D-2
B7
GND_Cx GND_Cx
VBUSx VBUSx
CC1c_Px
D-_Px D+_Px
D+_Px D-_Px
CC2c_Px
VBUSx VBUSx
GND_Cx GND_Cx
D-_Px D+_Px
1.3 Application example setup
The STSW-2STPD01 software package for the STEVAL-2STPD01 evaluation kit contains an application example
specific for the STM32G071RBT6 microcontroller embedding the USB Type-C and Power Delivery management
with the two ports and a module featuring the power sharing on these two stages.
To set up the demo and run the application with two Sink devices, you need:
• an STEVAL-2STPD01 evaluation kit
• a power supply: the DC power supply capability can start from 18.5 W (with a minimum voltage of 8.1 V),
depending on the input power; the solution adapts the output profiles for the required operating conditions
• two Type-C cables
• two Sinks (for example, two USB-C and Power Delivery mobile phones)
Section 1.3.1 describes how to run the application when a 144 W rated power supply (voltage = 24 V, current =
6 A ) is plugged to the STEVAL-2STPD01 J801 connector allowing the board to reach the 120 W maximum power
(60 W for each port) and making all the PDOs (5 V, 9 V, 15 V and 20 V, up to 3 A) available to both ports.
Section 1.3.2 describes how to configure the board input power in case a low power supply is used as input,
enabling the power sharing module to share the available power between the two ports.
Warning: Respect the following safety limitations:
•Voltage min. = 8.1 V
• Voltage max. = 24 V
• Power min. = 18.5 W
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Application example setup
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1.3.1 How to run the application with the maximum power rate input
Step 1. Verify that a jumper closes the expansion board J200 header, as highlighted in pink in the figure below.
Figure 17. STEVAL-2STPD01 evaluation kit - J200 closed by a jumper
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Application example setup
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Step 2. Plug the 24 V/6 A DC power supply into the expansion board J801 connector.
D201 red LED turns on.
After few milliseconds, the microcontroller runs the application firmware example, initializes all the
essential peripherals, and puts the system in standby, waiting for an "attach" event on the Type-C
receptacles: when the system is ready to interact with the Sinks, the LEDs (D400, D401, D600 and
D601) on top of the expansion board switch on.
Figure 18. 24 V, 6 A DC power supply connected to J801 connector
Step 3. Connect a Sink to one port through a Type-C cable.
After connecting the 24 V, 6 A DC power supply, the STEVAL-2STPD01 transmits the list of the
available PDOs (5 V, 9 V, 15 V and 20 V, up to 3 A) to the attached Sink which requests the suitable
one. If the request is accepted, the two systems reach an explicit contract.
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Step 4. Repeat step 3 for the other port with the other Sink.
Figure 19. STEVAL-2STPD01 evaluation kit connection example - charging two mobile phones
Note: Using a 24 V, 6 A power supply, each port of the kit can provide the maximum power of 60 W and four PDOs: 5
V, 9 V, 15 V and 20 V, up to 3 A.
Note: If the two ENx (green) and PWRx (blue) LEDs blink, it means a fault event has occurred and the port has gone
under protection. A power cycle is required to make it operative again.
RELATED LINKS
For further details on USBPD contract negotiation and specification, refer to AN5225.
1.3.2 How to set up the STEVAL-2STPD01 power input
By default, the STEVAL-2STPD01 is set to be plugged to an input power supply able of 24 V and 6 A. In case a
power supply with reduced capabilities is available, it is possible to test the application with a reduced input power
after storing the new value of the input voltage and current or power in the STEVAL-2STPD01 Flash memory.
In the following steps, we set up the board to be supplied with a 15 V, 3.5 A DC power supply.
Note: By reducing the input power, the PDOs are limited to the maximum value of the voltage provided.
For example, with a power supply with a minimum power capability of 20 W and 8.5 V, the solution is able to
provide only one PDO of 5 V, 3 A in one of the two ports.
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Application example setup
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Step 1. Download and install the STM32CubeMonUCPD, connect your power supply to one of the
two STEVAL-2STPD01 power connectors (J800 or J801) and connect the NUCLEO-G071RB
USB_STLINK CN2 connector to the PC through a micro-B USB cable.
Figure 20. Connections for input power setup
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Application example setup
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Step 2. Run STM32CubeMonUCPD.
Step 2a. In the first window, double-click the name of board to select it.
Figure 21. STM32CubeMonUCPD (1 of 2)
Step 2b. In the next window, double-click on the port number (1 or 2) to select it.
Figure 22. STM32CubeMonUCPD (2 of 2)
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Step 3. In the [Message Selector] tab, select [Send free text] by scrolling the right side bar or typing "free" in
the [Filtering messages] text box.
In the Free text box, you can insert the values of the used power supply for nominal voltage, current
and power, on the basis of the syntax described in Table 1.
Figure 23. STM32CubeMonUCPD main window
Table 1. Syntax to insert new input power values
Parameters Syntax
Voltage (Volts) V=XX[.X]
Current (Amperes) C=X[.X]
Power (Watts) P=XXX[.X]
Current values stored (voltage and current) ?
The input power rate can be specified in the text area, as a value list of voltage (V), current (C) or
power (P), separated by a comma, semicolon or space.
For example, with a power supply of 15 V, 3.5 A (rated as 52.5 W), valid configuration strings are:
– V=15, C=3.5
– C=3.5→ the system acquires the input voltage through an ADC channel
– P=52.5→ the system acquires the input voltage through an ADC channel and calculates the
current
– C=3.5, P=52.5→ the system calculates the voltage
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Application example setup
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Step 4. To send new values click on the [Send message to connected Port] button.
By clicking on the lower right corner ([Traces]), the new stored values are visible as shown below
(circled in pink).
Figure 24. New stored values
Step 5. Insert ‘?’ in the Free text row to view the current values stored in the Flash memory and the input
voltage read by the microcontroller ADC.
Figure 25. Current values
1.3.3 How to reprogram the NUCLEO-G071RB
The following procedure describes how to restore the initial application example (contained in the
STSW-2STPD01 software package) in the STM32G071RBT6 microcontroller.
To reprogram the NUCLEO-G071RB you need:
• an STEVAL-2STPD01 evaluation kit
• the STSW-2STPD01 software package
• a PC/laptop with at least a type-A port
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• a USB Micro-B cable
Step 1. Download, unzip and save STSW-2STPD01 software package.
Step 2. Open the firmware\project\STEVAL-2STPD01\bin folder and target the bin file.
You can also open the source code project with your favourite IDE and generate a new binary file or
start a debug session.
Step 3. Check the jumper on JP2 connector of the NUCLEO-G071RB development board is mounted on
position 1-2 (ST-LINK) as shown below.
Figure 26. NUCLEO-G071RB JP2 set on 1-2 before programming
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Step 4. Connect the USB Micro-B cable to the NUCLEO-G071RB USB micro-B USB_STLINK connector CN2,
and then connect the type-A side to the laptop type-A port as shown below.
Figure 27. NUCLEO-G071RB connected to the laptop to program the testing firmware
Step 5. Open a new explorer window and ensure the NUCLEO-G071RB board is mapped by the laptop
operative system as a virtual mass-storage device.
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Application example setup
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