ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 15

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5. Power Considerations
5.1
5.2
5.3
6430DS–ATARM–28-Mar-11
Power Supplies
Voltage Regulator
Typical Powering Schematics
The SAM3U product has several types of power supply pins:
Ground pins GND are common to VDDCORE and VDDIO pins power supplies.
Separated ground pins are provided for VDDBU, VDDPLL, VDDUTMI and VDDANA. These
ground pins are respectively GNDBU, GNDPLL, GNDUTMI and GNDANA.
The SAM3U embeds a voltage regulator that is managed by the Supply Controller.
This internal regulator is intended to supply the internal core of SAM3U but can be used to sup-
ply other parts in the application. It features two different operating modes:
For adequate input and output power supply decoupling/bypassing, refer to “Voltage Regulator”
in the “Electrical Characteristics” section of the product datasheet.
The SAM3U supports a 1.8V-3.6V single supply mode. The internal regulator input connected to
the source and its output feed VDDCORE.
schematics.
• VDDCORE pins: Power the core, the embedded memories and the peripherals; voltage
• VDDIO pins: Power the Peripherals I/O lines; voltage ranges from 1.62V to 3.6V.
• VDDIN pin: Powers the Voltage regulator
• VDDOUT pin: It is the output of the voltage regulator.
• VDDBU pin: Powers the Slow Clock oscillator and a part of the System Controller; voltage
• VDDPLL pin: Powers the PLL A, UPLL and 3-20 MHz Oscillator; voltage ranges from 1.62V
• VDDUTMI pin: Powers the UTMI+ interface; voltage ranges from 3.0V to 3.6V, 3.3V nominal.
• VDDANA pin: Powers the ADC cells; voltage ranges from 2.0V to 3.6V.
• In Normal mode, the voltage regulator consumes less than 700 µA static current and draws
• In Shutdown mode, the voltage regulator consumes less than 1 µA while its output is driven
ranges from 1.62V to 1.95V.
ranges from 1.62V to 3.6V. VDDBU must be supplied before or at the same time than VDDIO
and VDDCORE.
to 1.95V.
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 7µA.
internally to GND. The default output voltage is 1.80V and the start-up time to reach Normal
mode is inferior to 400 µs.
Figure
5-1,
Figure
5-2,
Figure 5-3
SAM3U Series
show the power
15