CYUSB3314 datasheet(7/43 Pages) CYPRESS

7 / 43 page

CYUSB330x/CYUSB331x

CYUSB332x/CYUSB230x

Document Number: 001-73643 Rev. *R

Page 7 of 43

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

Ghost Charge is enabled by default and can be disabled through

configuration. Refer to Configuration Options on page 24.

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 the OTG host that it is connected

to an ACA-Dock, the ID pin is tied to ground using a resistor

RID_A,3 as shown in Figure 5. The ACA-Dock feature can be

disabled using the Configuration Options on page 24.

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

Wall Charger

Detector

Other

Charging

Scheme

BC v1.2

Scheme

Charging

Scheme

Detector

Battery

Charger

Power

Switch

5 V

USB Battery-Powered Device

HX3 DS PORT

VBUS

HX3

Power

Switch

5 V

US_PWREN

VBUS

To US OTG

Enabled Device

PCB

Micro A Plug

VBUS

Power

Source

RID_A

VBUS

Note

3. 124 k

 is the recommended RID_A value as per BC v1.2 specification, but some portable devices use custom RID_A values.

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