Cypress CY4603, Руководство пользователя

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HX3 Kits User Guide, Doc. #: 001-91203 Rev. *D 75
Hardware
5.3.3.6 ACA- Dock Implementation
In traditional USB topologies, the host DS port provides VBUS to enable and charge the connected
devices. With OTG devices, however, the ACA-Dock provides VBUS and a method to charge the
host. HX3 supports the ACA-Dock standard by integrating the functions of the adaptor controller.
Figure 5-17 shows the ACA-Dock system. If ACA-Dock is enabled, HX3 turns on the external power
switch to drive VBUS on the US port. To inform the device connected on the US port that it should
act as a host and draw current, the ID pin is connected to ground using RID_A as shown in
Figure 5-17 .
Figure 5-17. ACA- Dock Implementation
Note: The RID resistor value may require change for docking applications targeted for some specific
hosts, which are not compliant to the BC v1.2 specification. Contact Cypress Technical Support at
cypress.com/go/support to get more details.
CY4613 supports the ACA-Dock feature (BC v1.2 compliant). The following three jumpers are used
to set up the ACA-Dock feature.
5.3.3.7 Test Points
Table 5-9 lists the test points available on the CY4613 hardware and the associated signal names.
Table 5-8. CY4613 ACA-Dock Configuration Jumpers
Jumper Purpose
J26 To drive VBUS on the US port
J27
To indicate to the device connected on the US port to act as a host and draw current from the VBUS
provided by the CY4613 board
J28 To enable VBUS sensing to the HX3 hub controller from an onboard DC-DC regulator
Table 5-9. CY4613 Test Points
Test Point Signal Name
TP1 Power Enable for DS3 port
TP2 GND
TP3 Overcurrent signal for DS4 port
TP4 VCC_5V
TP5 GND
TP6 Power Enable for Shared Link DS1 port
TP7 VBUS Power for DS3 port
HX3
Upstream
Port
CY4613
Board
Power
Switch
VBUS
Power
Source
VBUS
Enable
Power
RID_A (124 Kohm)