Datasheet

39
32099IS–01/2012
AT32UC3L016/32/64
6.1.3.3 3.3V Supply Mode with 1.8V Regulated I/O Lines
In this mode, the internal regulator is connected to the 3.3V source and its output is connected
to both VDDCORE and VDDIO as shown in Figure 6-4. This configuration is required in order to
use Shutdown mode.
Figure 6-4. 3.3V Supply Mode with 1.8V Regulated I/O Lines
In this mode, some I/O lines are powered by VDDIN while other I/O lines are powered by VDDIO.
Refer to Section 3.2 on page 9 for description of power supply for each I/O line.
Refer to the Power Manager chapter for a description of what parts of the system are powered in
Shutdown mode.
Important note: As the regulator has a maximum output current of 60mA, this mode can only be
used in applications where the maximum I/O current is known and compatible with the core and
peripheral power consumption. Typically, great care must be used to ensure that only a few I/O
lines are toggling at the same time and drive very small loads.
VDDIO
VDDCORE
Linear
Regulator
+
-
1.98-3.6V
VDDANA
ADC
VDDIN GND
GNDANA
CPU,
Peripherals,
Memories,
SCIF, BOD,
RCSYS,
DFLL
OSC32K
RC32K
AST
Wake
POR33
SM33
I/O Pins
I/O Pins