Power supplies AN3216
6/30 Doc ID 17496 Rev 5
2 Power supplies
2.1 Introduction
The device requires a 2.0 V to 3.6 V operating voltage supply (V
DD
), to be fully functional at
full speed. This maximum frequency is only achieved when the digital power voltage V
CORE
is equal to 1.8 V (product voltage range 1).
Product voltage range 2 (V
CORE
= 1.5 V) and 3 (V
CORE
= 1.2 V) can be selected when the
V
DD
operates from 1.65 V to 3.6 V. Frequency is limited to 16 MHz and 4 MHz when the
device is in product voltage range 2 and 3 respectively.
When the ADC and brownout reset (BOR) are not used, the device can operate at power
voltages below 1.8 V down to 1.65 V.
Digital power voltage (V
CORE
) is provided with an embedded linear voltage regulator with
three different programmable ranges from 1.2 to 1.8 V (typical).
Figure 1. Power supply overview
Note: V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively.
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