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USBPD_550mA_PROTECT (PD2)
5V_USBPD_PROTECT_1A (PC12)
1. The default setting is in bold.
It is possible to increase the default current limitation set on the 5V_USBPD supply following the next table
settings.
Mode
5V_USBPD_PROTECT_1A (PC12)
Default
Mode 1
Mode 2
Mode 3
1. The default setting is in bold.
Note that the current protection set on 5V_USBPD may include the current drawn by the 3V3_STLK power supply
at the start. This additional current depends on the 5V_USBPD, the 5V_USB_CHGR, and the 5V_VIN voltages of
the board. It can reach 150 mA maximum and can be suppressed by removing SB31. Note also that removing
SB31 may bring a behavior constraint: upon USB STLK insertion, the board is reset unless JP7 is removed.
In case of overcurrent detected on 5V_USBPD, the LTC-3114-1 progressively lowers 5V_USBPD voltage and
may reset the Discovery board. The LEDs LD7 and LD6 may indicate such a 5 V power decrease. By shutting
down the 5V_USBPD voltage, the current on USB Type-C
from overcurrent.
The current protection set on 5V_USBPD supply leads to corresponding current protection on USBPD_VBUS of
®
USB Type-C
Mode
Default
Mode 1
Mode 2
Mode 3
1. The default setting is in bold.
An USBPD_Detach function is designed to be able to monitor the USBPD_VBUS voltage on an
STM32G474RET6 microcontroller ADC. It is used by the USB software stack to get a USBPD_VBUS voltage
status close to the USB Type-C
13.1.2
Power input to the digital power buck‑boost feature
The USB Type-C
buck‑boost converter feature of the B-G474E-DPOW1 product (Refer to
boost
converter):
UM2577 - Rev 2
Table 8.
Command
Table 9.
Typical current protection on 5V_USBPD
(1)
0
0
1
1
CN2 connector.
Table 10
gives typical figures for two use cases.
Table 10.
5 V USBPD_ VBUS nominal voltage
0.45 A
0.7 A
1.2 A
1.5 A
®
connector and manage the unplugging procedure.
®
CN2 connector can also be used as a power input to demonstrate the digital power
PD2 and PC12 function
Logic
(1)
state
0
Deactivated
1
Connects R99 in parallel to R101
0
Deactivated
1
Connects R102 in parallel to R101
USBPD_550mA_PROTECT (PD2)
0
1
0
1
®
V
of CN2 decreases, protecting the USB Host
BUS
Typical current protection on CN2
(1)
Description
(1)
5V_USBPD typical protection
380 mA
520 mA
810 mA
950 mA
15 V USBPD_VBUS nominal voltage
0.15 A
0.23 A
0.4 A
0.45 A
Section 13.2 Digital power buck-
UM2577
USB Type-C®
page 26/54
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