HD3SS3220_15 Datasheet, PDF (16/43 Pages) Texas Instruments – HD3SS3220 USB Type-C DRP Port Controller with SuperSpeed 2:1 MUX

HD3SS3220
SLLSES1 – DECEMBER 2015
www.ti.com
The OUT1 and OUT2 pins are used to output the Type-C current mode when in GPIO mode. Additionally, the
OUT3 pin is used to communicate the Audio Accessory mode in GPIO mode. The specifics of the output pins
can be found in Table 3.
Table 3. Simplified Operation for OUT1 and OUT2
OUT1
H
H
L
L
OUT2
H
L
H
L
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Default
Default
Medium
High
When operating in I²C mode, HD3SS3220 uses the SCL and SDA lines for clock and data and the INT pin. The
INT pin communicates an interrupt, or a change in I²C registers, to the system. The INT pin will be pulled low
when the HD3SS3220 updates the registers with new information. The INT_N pin is open drain. The
INTERRUPT_STATUS register should be set when the INT pin is pulled low. The customer shall write to I²C to
clear the INTERRUPT_STATUS register.
When operating in GPIO mode, the OUT3 pin is used in place of INT pin to determine if an Audio Accessory has
been detected and attached. The OUT3 pin is pulled low when an Audio Accessory is detected.
NOTE
When using the 3.3-V supply for I²C pull-up, the customer must ensure that the VDD is 3
V and above. Otherwise, the I²C may back power the device.
7.3.11 HD3SS3220 V_(BUS) Detection
The HD3SS3220 device supports VBUS detection according to the Type-C Specification. VBUS detection is
used to determine the attachment and detachment of a UFP and to determine the entering and exiting of
accessary modes. VBUS detection is also used to successfully resolve the role in DRP mode. The system VBUS
voltage must be routed through a 900-kΩ resistor to the VBUS_DET pin on the HD3SS3220 device.
7.4 Device Functional Modes
The HD3SS3220 has four functional modes. Table 4 lists these modes:
MODES
Unattached
Active
Table 4. USB Type-C States according to HD3SS3220 Functional Modes
GENERAL BEHAVIOR
MODE
STATES ⁽¹⁾
UFP-Only
Unattached.SNK
AttachWait.SNK
USB port unattached. ID, PORT operational.
I²C on.
DFP
Toggle Unattached.SNK → Unattached.SRC
AttachedWait.SRC or AttachedWait.SNK
DFP-Only
Unattached.SRC
AttachWait.SRC
Attached.SNK
UFP-Only
Audio Accessory
Debug Accessory
Attached.SNK
USB port attached. All GPIOs operational.
I²C on.
DRP
Attached.SRC
Audio accessory
Debug accessory
Attached.SRC
DFP-Only
Audio accessory
Debug accessory
(1) (1) Required; not in sequential order
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