USB333X datasheet(37/85 Pages) MICROCHIP

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DS00001880A-page 37

USB333x

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.

5.8.1

ACTIVE ANALOG CHARGER DETECTION

The USB333x includes the active analog charger detection specified in the USB-IF Battery Charging Specification. The

additional analog circuitry will allow the USB333x to:

Detect a USB Charger that has shorted DP and DM together

Detect a USB Host/Charger

Behave as a USB Host/Charger

The charger detection circuitry is shown in Figure 5-11.

The VdatDet output is qualified with the Linestate[1:0] value. If the Linestate is not equal to 00 the VdatDet signal will

not assert.

FIGURE 5-11:

USB CHARGER DETECTION BLOCK DIAGRAM

Note:

The italic names in the Figure 5-11 correspond to bits in the ULPI register set.

V DAT_REF

VDD33

SM SC 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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