USB3813 datasheet(13/57 Pages) MICROCHIP

13 / 57 page

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

Datasheet

 2014 Microchip Technology Inc.

DS00001715A-page 13

Reference

Clock Select

1 Input

REFSEL1

This signal, combined with REFSEL0, selects the

reference clock input frequency. The reference

select input must be set to correspond to the

frequency applied to the REFCLK input. Refer to

Section 8.4, "Reference Clock," on page 41 for

additional information.

System Reset

Input

RESET_N

I_RST

This active-low signal allows external hardware to

reset the device.

Note:

The active-low pulse must be at least

5us wide. Refer to Section 8.3.2,

"External Chip Reset (RESET_N)," on

page 40 for additional information.

External USB

Transceiver

Bias Resistor

RBIAS

A 12.0k

Ω (+/- 1%) resistor is attached from

ground to this pin to set the transceiver’s internal

bias settings.

Hub Connect

Input

HUB_CONN

This signal is used to control the hub

communication stage. The device will transition

to the hub communications stage when this pin is

asserted high. Two methods of use may be used:

Tie to +3.3V: The hub will automatically transition

to the communications stage when configuration

is complete.

Transition from low to high: The hub will

transition to the communications stage after

configuration is complete and this signal

transitions from low to high.

Refer to Section 8.5, "Hub Connect

(HUB_CONN)," on page 42 for additional

information.

Charge

Detect 0

Output

CHRGDET0

This signal, in conjunction with CHRGDET1, can

be configured to communicate information that

can affect the level of current that the system

may draw from the upstream USB VBUS wire.

Refer to Section 8.1.1.1, "Charger Detection

(CHRGDET[1:0])," on page 37 for additional

information.

Charge

Detect 1

Output

CHRGDET1

This signal, in conjunction with CHRGDET0, can

be configured to communicate information that

can affect the level of current that the system

may draw from the upstream USB VBUS wire.

Refer to Section 8.1.1.1, "Charger Detection

(CHRGDET[1:0])," on page 37 for additional

information.

Table 3.1 Ball Descriptions (continued)

NUM

BALLS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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