IP1001LF 查看數據表（PDF） - Unspecified

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IP1001LF

Integrated 10/100/1000 Gigabit Ethernet Transceiver

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Pin description (continued)

Pin no.

Label

Miscellaneous

16

CTRL21

IP1001 LF

Data Sheet

Type Description

O

Regulator Control.

The internal linear regulator uses this pin to control an

external PNP transistor to generate a 2.1v voltage source.

IP1001 uses the AVDDH as a reference voltage, which can be

3.3v or 2.5v as shown in the following figure. The 2.1v power

source is used for center tap of transformer and AVDD. The

built in regulator works only if AVDD pins are connected to the

collector of the external PNP as shown in the following figure.

If AVDD pins are connected to an external power source

instead of the collector of PNP, the function of CTRL21

doesn’t work.

AVDDH (3.3v/ 2.5v)

CTRL21

AVDD (2.1v)

This pin can be left open if it is not used.

32

CTRL12D

O

Regulator Control.

The internal linear regulator uses this pin to control an

external PNP transistor to generate a 1.2v voltage source.

IP1001 uses the VDDO as a reference voltage, which can be

3.3v or 2.5v as shown in the following figure. The 1.2v power

source is used for DVDD.

The built in regulator works only if DVDD pins are connected

to the collector of the external PNP as shown in the following

figure. If DVDD pins are connected an external power source

instead of the collector of PNP, the function of CTRL12D

doesn’t work.

VDDO (3.3v/ 2.5v)

CTRL12D

DVDD (1.2v)

This pin can be left open if it is not used.

Copyright © 2006, IC Plus Corp.

13/48

Dec. 18, 2007

IP1001-DS-R06

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