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

UM2880

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

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

Aux Voltages

L7983

LDL112

Expansion board

NUCLEO-G071RB

Port 0

Port 1

Type-C

BUS

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

UM2880

System architecture

UM2880 - Rev 1 page 3/41

1.2.2 Expansion board

Figure 4. Expansion board schematic diagram main blocks

D_VDD

GND GND_MAIN

GND_Sign0 GND_PWR0

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_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 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 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 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

J801

CON2

R805

4.7k

R802

02 DC Input Section

V_PLUG

GND

VDD_5V

24V_Sense

24V

JP802

SHORT

J800

DC_POWER_JACK

R804

4.7k

JP803

SHORT

R807

R809

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.

UM2880

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)

1.2.2.1 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.

UM2880

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

J801

CON2

02 DC Input Section

V_PLUG

GND

VDD_5V

24V_Sense

24V

J800

DC_POWER_JACK

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

R203

20k

R201

91k

Q200

STL9P3LLH6

3 5

C203

0.22uF

J200

con2-strip-male

TP200

5001

D200

SMM4F28A

D201

LED RED

TP201

5001

R202

210k

C202

220uF

N.M.

L200

BNX002-11

1 2

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

L201

47uH

1 2

C206

0.47uF

C205

0.1uF

R207

51k

C204

2.2uF

C207

1uF

R205

R208

0N.M.

R209

0N.M.

U200L7983PU50R

VBIAS 2

EN/UVLO

VIN

RST

FSW 4

LNM/LCM 5

VCC 3

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

EN_TCPP02_P1

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

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

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.

UM2880

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

GND_Sign1^

GND_Pwr1^

GND

R400

25mOhms

TP401

5001

U400

STPD01

VDRIVEH 6

PVIN8

PVIN9

VCC

ADD

PGND10

PGND11

SGND

ISNS+ 19

ISNS- 20

LX13 13

LX14 14

BOOT 16

INT

CDC

SDA

1SCL

VSNS 21

VREG

LX15 15

Pon

NC 23

PGND12

12 EXP_PAD

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

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

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

TP407

5001

U401

TSV991AILT

R411

100K

R412

100K

C412

0.1uF

C413

0.22uF

R407

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).

UM2880

System architecture

UM2880 - Rev 1 page 8/41

Figure 12. D400 and D401 indicator LEDs (for port P0)

VCC_3.3V

GND GND

D401

LED BLUE

R409

1.2k

R410

3.3k

D400

LED GREEN

Q401

2N7002E-T1-GE3

Q400

2N7002E-T1-GE3

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

I2C_SCL

1^,3,4,5,7

D_VDD 1^,4,5

ADDR_TCPP02_Px

DVDD

C503

200pF

50V

U500

TCPP02-M18

VBUSc 8

CC1 2

CC1c

CC2 4

CBIAS

SRC 7

Isense 9

GND2

GND1

10 IANA 5

GATE 6

EN 1

VCC 3

CC2c

I2C_ADD

SDA

SCL

EP_GND

FLGn

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).

UM2880

System architecture

UM2880 - Rev 1 page 9/41

Figure 14. VBUS path load switch based on STL11N3H6 (Q500 and Q501) driven by TCPP02-M18

BUSx 1^,4

D500

ESDA25P35-1U1M

Q501

STL11N3LLH6

3 5

R500

10mOhms

TP500

5001

Q500

STL11N3LLH6

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

R507

50K

C505

0.22uF

U501

TSV991AILT

R509

R504

R505

16K

R502

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.

UM2880

System architecture

UM2880 - Rev 1 page 10/41

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