USB2502-AEZG Ver la hoja de datos (PDF) - SMSC -> Microchip

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USB2502-AEZG

2-Port USB 2.0 Hub Controller

SMSC -> Microchip 

NAME

Analog Test

&

Internal 1.8V

voltage

regulator

enable

Table 4.3 Miscellaneous Pins (continued)

2-Port USB 2.0 Hub Controller

Datasheet

SYMBOL

ATEST/

REG_EN

TYPE

AIO

FUNCTION

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.

NAME

VDDCORE3P3

VDD1P8

VDDAPLL3P3

VDDAPLL1P8

VDDA3P3

VSS

Table 4.4 Power, Ground, and No Connect

SYMBOL

TYPE

FUNCTION

VDD33CR

VDD18

VDDA33PLL

VDDA18PLL

VDDA33

VSS

+3.3V I/O Power.

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

acts as the regulator input

+1.8V core power.

If the internal regulator is enabled, then VDD18 pin 27

must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)

capacitor to VSS

+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

+1.8V Filtered analog power for internal PLL.

If the internal regulator is enabled, then this pin must

have a 4.7μF (or greater) ±20% (ESR <0.1Ω) capacitor

to VSS

+3.3V Filtered analog power.

Ground.

BUFFER

I

IPD

IPU

IS

I/O8

O8

Table 4.5 Buffer Type Descriptions

DESCRIPTION

Input.

Input, with a weak Internal pull-down.

Input, with a weak Internal pull-up.

Input with Schmitt trigger.

Input/Output 8mA

Output 8mA

Revision 2.3 (08-27-07)

14

DATASHEET

SMSC USB2502

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