USB3813 datasheet(49/68 Pages) SMSC

49 / 68 page

USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3813

Revision 1.0 (06-17-13)

DATASHEET

Chapter 8 Functional Descriptions

This chapter provides additional functional descriptions of key device features.

8.1

Battery Charger Detection & Charging

The USB3813 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 USB3813 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

balls. If a voltage within the specified range is detected, the CHRGDET[1:0] signals will be asserted

and the 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. The type of charger detected is returned in the

CHARGER_TYPE field of the .

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

USB3813 数据表(PDF) 49 Page - SMSC Corporation

USB3813 数据表(HTML) 49 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

数据表下载