USB4604 datasheet(42/62 Pages) MICROCHIP

42 / 62 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

DS00001716A-page 42

 2014 Microchip Technology Inc.

Chapter 8 Functional Descriptions

This chapter provides additional functional descriptions of key device features.

8.1

Battery Charger Detection & Charging

The USB4604 supports both upstream battery charger detection and downstream battery charging.

The integrated battery charger detection circuitry supports the USB-IF Battery Charging (BC1.2)

detection method and most Apple devices. These circuits are used to detect the attachment and type

of a USB charger and provide an interrupt output to indicate charger information is available to be read

from the device’s status registers via the serial interface. The USB4604 provides the battery charging

handshake and supports the following USB-IF BC1.2 charging profiles:



DCP: Dedicated Charging Port (Power brick with no data)



CDP: Charging Downstream Port (1.5A with data)



SDP: Standard Downstream Port (0.5A with data)



Custom profiles loaded via SMBus or OTP

The following sub-sections detail the upstream battery charger detection and downstream battery

charging features.

8.1.1

Upstream Battery Charger Detection

Battery charger detection is available on the upstream facing port. The detection sequence is intended

to identify chargers which conform to the Chinese battery charger specification, chargers which

conform to the USB-IF Battery Charger Specification 1.2, and most Apple devices.

In order to detect the charger, the device applies and monitors voltages on the upstream DP and DM

pins. If a voltage within the specified range is detected, the device will be updated to reflect the proper

status.

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

Charging Specification. When enabled, 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.

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 DM

011

Apple Low Current Charger

Apple

100

Apple High Current Charger

Apple

101

Apple Super High Current Charger

DP=2.7V

DM=2.0V

110

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