STUSB1600 Datasheet, PDF (23/69 Pages) STMicroelectronics – Power hubs and docking stations

STUSB1600
Features description
• In source power role, a debug accessory device is detected when both the CC1 and
CC2 pins are pulled down to ground by an Rd resistor from the connected device. The
orientation detection is performed in two steps as described in the table below. The
DEBUG2 pin is asserted to advertise the DTS detection and the A_B_SIDE pin
indicates the orientation of the connection. The orientation detection is advertised
through the TYPEC_FSM_STATE bits of the I²C register CC_OPERATION_STATUS
(see Section 5.1: Register description).
Table 11. Orientation detection in source power role
#
CC1 pin CC2 pin
(CC2 pin) (CC1 pin)
Detection
process
A_B_SIDE pin
CC1/CC2
(CC2/CC1)
Orientation detection state
TYPEC_FSM_STATE bits value
1
Rd
1^st step: debug
Rd
accessory mode
detected
HiZ (HiZ)
UnorientedDebugAccessory.SRC
2
Rd
≤ Ra
2^nd step:
orientation
detected (DTS
presents a
resistance to GND
with a value ≤ Ra
on its CC2 pin)
HiZ (0)
OrientedDebugAccessory.SRC
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