USB2502-HT datasheet(14/44 Pages) SMSC

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2-Port USB 2.0 Hub Controller

Datasheet

Revision 2.1 (12-06-06)

SMSC USB2502

DATASHEET

Analog Test

Internal 1.8V

voltage

regulator

enable

ATEST/

REG_EN

AIO

This signal is used for testing the analog section of the

chip, and to enable or disable the internal 1.8v regulator.

This pin must be connected to VDDA33 to enable the

internal 1.8V regulator, or to VSS to disable the internal

regulator.

When the internal regulator is enabled, the 1.8V power

pins must be left unconnected, except for the required

bypass capacitors.When the PHY is in test mode, the

internal regulator is disabled and the ATEST pin

functions as a test pin.

Table 4.4 Power, Ground, and No Connect

NAME

SYMBOL

TYPE

FUNCTION

VDDCORE3P3

VDD33CR

+3.3V I/O Power.

If the internal core 1.8V regulator is enabled, then this pin

acts as the regulator input

VDD1P8

VDD18

+1.8V core power.

If the internal regulator is enabled, then VDD18 pin 27

must have a 4.7

μF (or greater) ±20% (ESR <0.1Ω)

capacitor to VSS

VDDAPLL3P3

VDDA33PLL

+3.3V Filtered analog power for the internal PLL

If the internal PLL 1.8V regulator is enabled, then this pin

acts as the regulator input

VDDAPLL1P8

VDDA18PLL

+1.8V Filtered analog power for internal PLL.

If the internal regulator is enabled, then this pin must

have a 4.7

μF (or greater) ±20% (ESR <0.1Ω) capacitor

to VSS

VDDA3P3

VDDA33

+3.3V Filtered analog power.

VSS

Ground.

Table 4.5 Buffer Type Descriptions

BUFFER

DESCRIPTION

Input.

IPD

Input, with a weak Internal pull-down.

IPU

Input, with a weak Internal pull-up.

Input with Schmitt trigger.

I/O8

Input/Output 8mA

Output 8mA

Table 4.3 Miscellaneous Pins (continued)

NAME

SYMBOL

TYPE

FUNCTION

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