System
architecture
UM2191
28/55
DocID030479 Rev 2
This mode is enabled by connecting CC1DB and CC2DB respectively to CC1 and CC2.
Thanks to this connection, the pull-down terminations on the CC pins are present by default
even if the device is not supplied.
When an STUSB1602 device configured in dead battery mode is connected to source, it is
supplied via its VDD pin connected to V
BUS
on the USB Type-C receptacle side. The
STUSB1602 may establish the source-to-sink connection by enabling the power path on
V
BUS
.
When the STUSB1602 assumes the sink power role, the VBUS_EN_SNK pin allows the
enabling of the incoming V
BUS
power when the connection to a source is established and
V
BUS
is in the valid operating range. Similarly, in the source power role, the
VBUS_EN_SRC pin allows the enabling of the outgoing V
BUS
power when the connection
to a sink is established and V
BUS
is in the valid operating range.
In both cases, the open drain output of the VBUS_EN_SNK and VBUS_EN_SRC pins
allow the direct driving of a PMOS transistor. The logic value of these pins is also
advertised in a dedicated I²C register bit.
2.3.3
P-NUCLEO-USB002 expansion board: V
CONN
switch
The V
CONN
input power pin of STUSB1602 is connected to pins CC1 and CC2 across
independent subscript for CONN power switches. The V
CONN
voltage provided to the
STUSB1602 device can be supplied via the power connector or the local voltage regulator
according to the JP000 and JP001 jumper settings below.
Table 6: P-NUCLEO-USB002 expansion board VCONN settings
V
CONN
is provided by the local voltage regulator
V
CONN
is provided by the power connector