IP1001 LF
Data Sheet
Pin description (continued)
Pin no.
Label
Type
Description
Miscellaneous
16
CTRL21
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.
Dec. 18, 2007
13/48
Copyright © 2006, IC Plus Corp.
IP1001-DS-R06
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