Datasheet

21
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
Figure 5-1. VDDCORE and VDDIO Constraints at Startup
5.2.2 VDDIO Versus VDDIN
At power-up, V
DDIO
needs to reach 0.6 V before V
DDIN
reaches 1.0 V.
VDDIO voltage needs to be equal to or below (VDDIN voltage + 0.5 V).
5.3 Voltage Regulator
The SAM3X/A series embeds a voltage regulator that is managed by the Supply Controller.
This internal regulator is intended to supply the internal core of SAM3X/A series but can be used to supply other
parts in the application. It features two different operating modes:
 In Normal mode, the voltage regulator consumes less than 700 µA static current and draws 150 mA of
output current. Internal adaptive biasing adjusts the regulator quiescent current depending on the required
load current. In Wait Mode or when the output current is low, quiescent current is only 7 µA.
 In Shutdown mode, the voltage regulator consumes less than 1 µA while its output is driven internally to
GND. The default output voltage is 1.80V and the startup time to reach Normal mode is inferior to 400 µs.
For adequate input and output power supply decoupling/bypassing, refer to Table 45-3 ”1.8V Voltage Regulator
Characteristics”.
Supply (V)
Time (t)
t
RST
VDDIO
V
T+
VDDCORE
V
DDIO(min)
V
DDCORE(min)
Core supply POR output
SLCK