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USB334X Datasheet(PDF) 38 Page - Microchip Technology

No. de pieza USB334X
Descripción Electrónicos  Enhanced Single Supply Hi-Speed USB ULPI Transceiver
PDF  92 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB334X Datasheet(HTML) 38 Page - Microchip Technology

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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
DP
VDD33
M CHP PHY
To USB Con.
C hargerP ullupE nD P
en
DM
To USB Con.
C hargerP ullupEnD M
ID atS inkEn
HostChrgE n
V datD et
VD atSrcE n
IDAT_SINK
en
V DAT_SRC
C ontactD etectE n
IDP_SRC
en
D pP ulldow n
D m Pulldow n



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