USB3370 datasheet(30/75 Pages) MICROCHIP

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USB3370

DS00001915B-page 30

 2012 - 2015 Microchip Technology Inc.

5.8

USB UART Support

The USB3370 provides support for the USB UART interface as detailed in the ULPI specification and the former CEA-

936A specification. The USB3370 can be placed in UART Mode using the method described in Section 6.7, 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 USB3370 to detect when a Battery Charger, Charging Host Port, or a USB Host is

attached to the USB connector. The USB3370 can also be configured to appear as a Charging Host Port, all according

to the USB-IF Battery Charging 1.1 specification. The charger detection circuitry should be disabled during USB oper-

ation.

The charger detection circuitry runs from the VDD33 supply and requires that the VDD33 supply to be present to run

the charger detection circuitry. The VDD33 supply is present anytime the RESETB pin is pulled high and VBAT is pres-

ent. The charger detection circuits are fully functional while in Low Power Mode (Suspendm = 0). The status of the Vdat-

Det

can be relayed back to the Link through the ULPI interrupts in both Synchronous mode and Low Power Mode.

FIGURE 5-10:

USB CHARGER DETECTION BLOCK DIAGRAM

Note:

The italic names in the Figure 5-10 correspond to bits in the ULPI register set.

V DAT_REF

VDD33

PHY

To USB Con.

C hargerP u llupE nD P

To USB Con.

C h argerPu llupE nD M

ID a tSinkEn

Ho stCh rg E n

V datD e t

VD atS rcE n

IDAT_SINK

V DAT_SRC

C ontactD etectE n

IDP_SRC

D p Pulldow n

D m P u lldow n

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