USB334X datasheet(38/92 Pages) MICROCHIP

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USB334x

DS00002646A-page 38

 2009-2018 Microchip Technology Inc.

5.7.3

DRIVING EXTERNAL VBUS

The USB334x monitors VBUS as described in VBUS Monitoring and VBUS Pulsing. The USB334x does not provide an

external output for the DrvVbusExternal ULPI register. For OTG and Host applications, the external VBUS supply or

power switch must be controlled by the Link.

5.8

USB UART Support

The USB334x provides support for the USB UART interface as detailed in the ULPI specification and the former CEA-

936A specification. The USB334x can be placed in UART Mode using the method described in Section 6.7, "Carkit

Mode," on page 59, and the regulator output will automatically switch to the value configured by the UART RegOutput

bits in the USB IO & Power Management register. While in UART mode, the Linestate signals cannot be monitored on

the DATA[0] and DATA[1] pins.

5.9

USB Charger Detection Support

The following blocks allow the USB334x to detect when a Battery Charger, Charging Host Port, or a USB Host is

attached to the USB connector. The USB334x can also be configured to appear as a Charging Host Port, all according

to the USB-IF Battery Charging 1.2 specification. The charger detection circuitry should be disabled during USB oper-

ation.

FIGURE 5-9:

USB CHARGER DETECTION BLOCK DIAGRAM

Note:

The italic names in the Figure 5-9 correspond to bits in the ULPI register set.

VDAT_REF

VDD33

M CHP PHY

To USB Con.

C hargerP ullupE nD P

To USB Con.

C hargerP ullupEnD M

ID atS inkEn

HostChrgE n

V datD et

VD atSrcE n

IDAT_SINK

V DAT_SRC

C ontactD etectE n

IDP_SRC

D pP ulldow n

D m Pulldow n

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