Figure 8.
High Speed Switch for AUX/SBU management
10
2
Vcc
3
D8
8
GND
100K
GND
D2
5
GND
GND
2S1
7
1
STG3684AUTR
2
1S1
GND
1
ESDALC5-1BF4
D1
2
ESDALC5-1BF4
D_VDD
GND
R17
C8
1
D7
2IN
4
SBU_ENABLE
U2
1S2
1
6
2S2
2
DP_AUX_P
SBU1
SBU2
1
2
9
1IN
0.22µF
DP_AUX_N
The USB Type-C to DP controller (
STM32F072
microcontroller) receives hot plug detection signal (DP_HPD) from
the display through the CN2 connector.
1.4
Local power management stage and LEDs
As the adapter shall have the sink role and start up under Dead Battery Mode, the local power management stage
supplies the board through an LDK220 voltage regulator from the VBUS or VCONN voltage supply lines on the
host USB receptacle.
The LDK220 low quiescent current and low noise LDO supplies a maximum 200 mA output from a 2.5 V to 13.2 V
input range, with a typical drop-out voltage of 100 mV.
The
STEVAL-USBC2DP
platform includes the following status LEDs:
1.
green LED D12 to signal that the platform is powered.
2.
blue LED D13 (connected to the
STM32F072
PA7 pin) to signal the status of the Alternative Mode operation.
Figure 9.
schematic view of the local 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
2
GND
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
STPS05220Z
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
0.1uF
0.47uF
2
L2
2
4.7uF
1
0.1uF
2
1
D_VDD
2
GND
L1
C13
2
1
D_VDD
2
D_VDD
D_VDD
Jumper J2 should remain on pins 2-3 for normal operation with VBUS or VCONN supplied through the host USB
Type-C connector. J2 can alternatively be closed on pins 1-2 to supply the platform through the STLINK SWD
connector during debugging.
UM2355
Local power management stage and LEDs
UM2355
-
Rev 2
page 7/20
