CYUSB3302 データシートの表示（PDF） - Cypress Semiconductor
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CYUSB3302 Datasheet PDF : 33 Pages
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CYUSB330x
CYUSB331x
CYUSB332x
When the US port is disconnected from the host, HX3 detects if
any of the DS ports are connected to a device requesting
charging. It determines the charging method and then switches
to the appropriate signaling based on the detected charging
specification as shown in Figure 4. The hub either emulates a
USB-compliant dedicated charging port by connecting DP and
DM (see the BC v1.2 specification) or other supported
proprietary charging schemes.
Figure 4. Ghost Charge Implementation in HX3
Other
Charging
Scheme
HX3 DS PORT
BC v1.2
Scheme
Charging
Scheme
Detector
5V
Power
Switch
VBUS
Wall Charger
Detector
Battery
Charger
USB Battery-Powered Device
Ghost Charge is enabled by default and can be disabled through
configuration. Refer to Configuration Options on page 17.
Vendor-Command Support
HX3 supports vendor-specific requests and can also enumerate
as a vendor-specific device. The vendor-specific request can be
used to (a) bridge USB and I2C and (b) configure HX3. This
feature can be used for the following applications:
■ Firmware upgrade of an external ASSP connected to HX3
through USB
■ In-System programming (ISP) of an EEPROM connected to
HX3 through USB
ACA-Dock Support
In traditional USB topologies, the host provides VBUS to enable
and charge the connected devices. For OTG hosts, however, an
ACA-Dock provides VBUS and a method to charge the host.
HX3 supports the ACA-Dock standard (see BC v1.2 specifi-
cation) by integrating the functions of the adapter controller.
Figure 5 shows the ACA-Dock system. If the ACA-Dock feature
is enabled, HX3 turns on the external power switch to drive
VBUS on the US port. To inform that the OTG host is connected
to an ACA-Dock, the ID pin is tied to ground using a resistor
RID_A, as shown in Figure 5. The ACA-Dock feature can be
disabled using the Configuration Options on page 17.
For example, a BC v1.2 compliant phone such as a Sony Xperia
(neo V) can be docked to a HX3-based ACA-Dock system. The
phone acts as an OTG host and the ACA-Dock charges the
phone connected to the US port while also powering the four DS
ports.
Figure 5. ACA-Dock Support
VBUS
Power
Source
VBUS
Power US_PWREN
HX3
Switch
VBUS
To US OTG
Enabled Device ID
RID_A = 124 k
Micro A Plug
PCB
Document Number: 001-73643 Rev. *G
Page 6 of 33
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