Datasheet
15
11096AS–ATARM–4-Oct-11
SAM9N12
5. Power Considerations
5.1 Power Supplies
The SAM9N12 has several types of power supply pins:
5.2 Programmable I/O Lines Power Supplies and Current Drive
5.2.1 External Bus interface
32 bits Wide Interface, Supporting:
• 16-bit DDR2/LPDDR, 32-bit SDRAM/LPSDR
• Static Memories
• NAND Flash with up to 24-bit ECC
Refer to EBI section, chapter Implementation examples for hardware connection details.
The EBI I/Os accept two drive levels, HIGH and LOW. This allows to avoid overshoots and give
the best performances according to the bus load and external memories.
The voltage ranges and the slew rates are determined by programming EBI_DRIVE field in the
Chip Configuration registers located in the Matrix User Interface.
At reset the selected current drive is HIGH.
A switch NFD0_ON_D16 allows the user to select NAND Flash path on D0-D15 or D16-D31,
depending on memory power supplies. This switch is located in the register EBICSA in the Bus
Matrix user interface.
In the following example, the NAND Flash and the external RAM (DDR2 or LPDDR or 16-bit
LPSDR) are in the same power supply range, (NFD0_ON_D16 = 0).
Table 5-1. SAM9N12 Power Supplies
Name
Voltag e R ange,
nominal
Associated
Ground
Powers
VDDCORE 0.9-1.1V, 1.0V GNDCORE
the core, including the processor, the embedded
memories and the peripherals, the internal 12 MHz RC
VDDIOM
1.65-1.95V, 1.8V
3.0-3.6V, 3.3V
GNDIOM the External Memory Interface I/O lines
VDDNF
1.65-1.95V, 1.8V
3.0-3.6V, 3.3V
GNDIOM
the NAND Flash I/O and control, D16-D32 and
multiplexed SMC lines
VDDIOP0 1.65-3.6V GNDIOP a part of Peripherals I/O lines
VDDIOP1 1.65-3.6V GNDIOP a part of Peripherals I/O lines
VDDBU 1.65-3.6V GNDBU
the Slow Clock oscillator, the internal 32-kbyte RC and a
part of the System Controller
VDDUSB 3.0-3.6V, 3.3V GNDUSB the USB interface
VDDPLL 0.9-1.1V, 1.0V GNDPLL the PLL cells
VDDOSC 1.65-3.6V GNDPLL the Main Oscillator cells
VDDANA 3.0-3.6V, 3.3V GNDANA the Analog to Digital Converter
VDDFUSE 3.0-3.6V, 3.3V GNDFUSE Fuse box for programming