USB3803 datasheet(70/99 Pages) MICROCHIP

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USB3803

DS00001691B-page 70

 2014-2015 Microchip Technology Inc.

8.0

BATTERY CHARGING

8.1

Upstream Battery Charger Detection

Battery Charger Detection is available on the upstream facing port. The detection sequence is intended to identify char-

gers which conform to the Chinese battery charger specification, chargers which conform to the USB-IF Battery Charger

Specification 1.1.

DP and DM are high impedance when the charger detection block is disabled.

The device includes the circuitry required to implement battery charging detection using the Battery Charging Specifi-

cation. The device will automatically perform charger detection upon entering the Hub.ChgDet stage in Hub Mode. The

device includes a state machine to provide the detection of the USB chargers listed in the table below. The type of char-

ger detected is returned in the ChargerType bits in the Battery Charger Detection Register.

The device will automatically begin a charger detection when Hub.ChgDet stage in Hub Mode is entered. The device

will provide feedback to the system through the serial port registers and the INT_Npin.

The following sections detail the sequence followed for battery charger detection.

TABLE 8-1:

CHARGERS COMPATIBLE WITH UPSTREAM DETECTION

USB ATTACH TYPE

DP/DM PROFILE

CHARGERTYPE

DCP

(Dedicated Charging Port)

Shorted < 200ohm

001

CDP

(Charging Downstream Port)

VDP reflected to VDM

010

(EnhancedChrgDet = 1)

SDP

(Standard Downstream Port)

USB Host or downstream hub port

15Kohm pull-down on DP and

011

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