Features
• Full reference design for USB Type-C to DisplayPort adapter with USB Type-C
connector and DisplayPort connector.
• Single chip solution based on the STM32F072 series 32-bit microcontrollers with
integrated USB 2.0 peripheral.
• Based on certified X-CUBE-USB-PD middleware stack, compliant with the
following standards and specifications:
– USB Type-C Cable and Connector 1.3
– USB Power Delivery 2.0 and 3.0
– VESA DisplayPort Alternate Mode on USB Type-C Standard 1.0a
– USB Device Class Definition for Billboard Devices 1.21
• EMI filtering and ESD protection circuits.
• Compact PCB design: 5.5 x 2.3 cm
• RoHS compliant
Description
The compact USB Type-C to DisplayPort adapter reference design, with USB Type-C
connector and DisplayPort connector, exploits Alternate Mode of the USB Type-C
and Power Delivery specifications to offer a comprehensive VESA® DisplayPort
Standard interface.
With this adapter, you can connect a monitor with a DisplayPort interface to any
laptop, tablet or smartphone with a reversible USB Type-C connector that is
compliant with the Power Delivery specification.
The DisplayPort Alternate Mode allows video data to be delivered through the
SuperSpeed USB lines on the Type-C connector, while Auxiliary lanes (AUX) and hot
plug detection (HPD) signals are sent through other Type-C lines.
The high-performance ARM® Cortex®-M0 32-bit STM32F072 microcontroller
engages in DisplayPort Alt Mode negotiation through vendor-defined messages
(VDM) according to the USB Power Delivery Specification. The messages are
transmitted along configuration channel (CC), through a simple discrete analog front
end (AFE) interface between the STM32 MCU and the USB Type-C connector.
The STM32 microcontroller running the ST USB Middleware stack and the
embedded USB 2.0 controller provide the Billboard Device Class support as required
by the USB Power Delivery standard, as well as the Device Firmware Upgrade
capability.
Summary table
STEVAL-USBC2DP USB
Type-C™ to
DisplayPort™ adapter
STEVAL-
USBC2DP
X-CUBE-USB-PD
software expansion for
STM32Cube
X-CUBE-USB-
PD
STM32F072 series 32-bit
ARM Cortex MCU with
crystal-less USB 2.0 FS
interface
STM32F072
LDK220 200 mA low
quiescent current and
low noise LDO
LDK220
STG3684A low voltage
0.5 Ω max dual SPDT
switch
STG3684A
USB Type-C™ to DisplayPort™ adapter
STEVAL-USBC2DP
Data brief
DB3497 - Rev 3 - February 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1USB Type-C to DisplayPort reference design architecture
The STEVAL-USBC2DP reference design for the USB Type-C to VESA DisplayPort adapter is a complete
solution based on the following logical blocks:
1. A USB Type-C reversible connector
2. A DisplayPort connector
3. An STM32F072 MCU running the X-CUBE-USB-PD software package with Middleware stack
4. A USB Type-C discrete analog front end
5. The on-board power management stage controlled by the LDK220 low dropout voltage regulator to supply
the dongle through the Type-C connector VBUS or VCONN pins
6. The STG3684A low voltage 0.5 Ω max. dual SPDT switch between the DisplayPort auxiliary (AUX) and the
side-band unit (SBU) lines
Figure 1. STEVAL-USBC2DP system architecture block diagram
The adapter reference design also features:
• Dual supply options through USB Type-C connector:
– VBUS
– VCONN
• VBUS voltage sensing for power monitoring
• USB 2.0 interface available on Type-C™ port for Billboard Device Class and Device Firmware Upgrade
• A power status LED and USB Power Delivery Status LED
• A RESET button
• On-board SWD connector that can be connected with the ST-LINK/V2-1 debugger/programmer embedded
on STM32 Nucleo boards
STEVAL-USBC2DP
USB Type-C to DisplayPort reference design architecture
DB3497 - Rev 3 page 2/8
2Schematic diagrams
Figure 2. MCU section
VDD2
STL6N2VH5
5.1k
ESDALC5-1BF4
R7
PIN2
3
PA1
1
17
USART_TX
2
PB8
TP3
DP_AUX_P
40
5001
1
2
R19
R5
75
2
PB10
1
6
R6
27
Q2
J1
1
D13
R4
5
GND
PA7
11
PA2
2
C5
D_VDD
0.22µF
nRESET
GND
C6
VDD2
39
PB4
31
PA11 32
CLOCK_IN
CLOCK_OUT
19
VDDIO
VDD1
DP_AUX_N
47
VDD1
34
23
2
USART_RX
LED BLUE
SWCLK
PB6
42
PB14
R9
GND
D_VDD
BOOT0
1
CC_RX
CC_TX
2
GND
15
PA6 16 DP_AUX_P
2
12
PB7
43
2
2
0.1µF
PB12
10k
1
VBUS
Boot
Option
Reset
Button
Ext.
Comm.
Conn.
5001
48
R16
38
PB3
Q1
1
2
DP_HPD
3
SWDIO PA13_SWDIO
VSS2
24
DP_AUX_N
RXREF
28
C22
1
R14
2
2
U4
2
8
TP2
35
PB9
0.0
1
6
PA14_SWCLK
PA15
10000pF
1M
1
PC14-OSC32_IN
4
10k
EXT_3.3V
R1
PB15
PA3 13
USART_RX
CC
1VBAT
D_VDD
1
GND
1
1PIN1
nRESET
SWDIO
820pF
STL6N2VH5
3
1
3
7
GND
PB2
20
1
2
nRESET
2
46
VSS3
SBU_ENABLE
1
2
VBAT
VDDA
100
1
PB5
41
PA4
2
0.0
1
D3
PB13 26
5
75
1
36 VDDIO2
37
18
PB1
NRST
8VSSA
2
PIN3
4
1
6
5
1
2
DP_HPD
SW1
4
4.7k
45
1
1
PF0-OSC_IN
6
C7
24k
EXP_PAD
TP1
8.2k
22
8
8
4
25
21
BOOT0
14
PA5
PA12 33
USART_TX
GND
D_VDD
P2
PIN4
5PIN5
9
USB_DM
USB_DP
2
4
SWCLK
D_VDD
1
PA8
GND
R21
PC15-OSC32_OUT
5
29
PA9
49
7
R8
VSS1
R22
2
BOOT0
44
VDD_A
GND
7
3
PB0 1
5001
STM32F072C8U6
2PC13
169
1
PB11
PIN1
2
R3
1
PA0 10
7
PF1-OSC_OUT
VDDA
GND
1437566-3
P1
2
GND
D_VDD
GND
1.5K
2
R2
30
PA10
PIN2
SWD
Conn.
PD_HPD
STEVAL-USBC2DP
Schematic diagrams
DB3497 - Rev 3 page 3/8
Figure 3. USB Type-C Plug
DP_ML2+
A10
RX2+
2
VCONN
USB_DM
USB_DP
A8
A9
VBUS2
D2
C1
DP_ML2-
0.1µF
C3
B12
Wurth 632712000011
RX1+
R18
1k
B10 A3
A4
0.1µF
2
1
VConn
B5
VBUS3
GND
1
CN1
1
A1
TX1+ A2
VBUS
D1
ESDAULC5-1BF4
B9 VBUS4
SBU2
B8
DP_ML1+
1
1
0.1µF
VCONN
TX2+
D-1
ESDAULC5-1BF4
CC
DP_ML1-
GND
A5
D+1 A6
GND
2
GND4
2
1
GND
B2
GND3
TX1-
B11
RX1-
1
SBU2
A7
SBU1
0.1uF
2
DP_ML3+
C2
GND
B4
TX2-
B3 RX2- A11
GND2 A12
DP_ML0+
C4
VBUS
VBUS1
CC
B1
GND1
VBUS
2
VBUS
DP_ML0-
DP_ML3-
SBU1
2
Figure 4. DisplayPort Receptacle
2
DP_AUX_N
DP_AUX_P
20
GND
DP_ML3-
DP_ML0+
2
DP_ML0-
2
13
CONFIG1
R11
1M
R13
1M
ESDALC5-1BF4
GND
R10
GND
4.7M
1
ML2+ 5
GND3 4
ML2-
ESDALC5-1BF4
ML0+
0472720001
AUX_CH_P
GND5 16
2
DP_HPD
DP_ML3+
D4
ML1+ 8
19
DP_PWR_RET
HPD 18
2
DP_PWR
2
1
14
CONFIG2
GND1 11
15
CFG1
GND
1M
3
ML3+
1
DP_ML1+
1
CFG2
17
AUX_CH_N
ML1- 6
2
DP_ML1-
R15
2
GND2 7
10
9
2
1
D6
R12
ESDALC5-1BF4
D5
DP_ML2+
CN2
DP_ML2-
GND4 1
ML3-
1
12
ML0-
1
1
470k
Figure 5. Power Management Stage
C15
C18
1
GND
C10
GND
IN
1
LDK220M33R
VDD1
D10
STPS0520Z
VDD_A
VBUS
EN
3
2
3.3V
75
1
2GND
C19
2
C20
1
ESDA7P60-1U1M
2
C16
10000pF
R20
C21
GND
2
30Ohm@100MHz
1
GND
VDDIO
C11
1
3
GRPB031VWVN-RC
10000pF
2
1
VDDA
EXT_3.3V
4.7uF
2
1
3.3V
D9
0.1uF
1uF
2
1
0.1uF
LED YELLOW-GREEN
1
C12
D12
LED
Power-On
C9
GND
2
D_VDD
GND
C17
VCONN
1uF
1
1
D11
2
STPS0522
0Z
2
30Ohm@100MHz
GND
OUT 5
3.3V
1
1
0.1uF
2
C14
NC
4
1
J2
1
VDD2
VBAT
2
GND
2
10000pF
1
1
VDD_A
U3
0.1uF0.47uF
2
L2
2
4.7uF
1
0.1uF
2
1
D_VDD
2
GND
L1
C13
21
D_VDD
2
D_VDD D_VDD
STEVAL-USBC2DP
Schematic diagrams
DB3497 - Rev 3 page 4/8
Figure 6. Hi-Speed Data Switch
10
2
Vcc 3
D8
8GND
100K
GND
D2 5
GND GND
2S1
7
1
STG3684AUTR
21S1
GND
1
ESDALC5-1BF4
D1
2
ESDALC5-1BF4
D_VDD
GND
R17
C8
1
D7
2IN
4
SBU_ENABLE
U2
1S2
1
62S2
2
DP_AUX_P SBU1
SBU2
1
2
91IN
0.22µF
DP_AUX_N
STEVAL-USBC2DP
Schematic diagrams
DB3497 - Rev 3 page 5/8
3References
1. USB Type-C™ Cable and Connector Specification, Release 1.3, July 12, 2017.
2. USB Power Delivery Specification Revision 3.0, Version 1.1, January 12, 2017.
3. VESA DisplayPort Alternate Mode on USB Type-C Standard, Version 1.0a, August 05, 2015.
4. USB Device Class Definition for Billboard Devices, Revision 1.21, September 8, 2016.
STEVAL-USBC2DP
References
DB3497 - Rev 3 page 6/8
Revision history
Table 1. Document revision history
Date Version Changes
01-Feb-2018 1 Initial release.
19-Feb-2018 2 Minor text edits
27-Feb-2018 3 Minor text edits
STEVAL-USBC2DP
DB3497 - Rev 3 page 7/8
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STEVAL-USBC2DP
DB3497 - Rev 3 page 8/8
