AT91SAM9263 datasheet(13/51 Pages) ATMEL

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6249HS–ATARM–27-Jul-09

AT91SAM9263 Preliminary

Power Considerations

5.1

Power Supplies

AT91SAM9263 has several types of power supply pins:

• VDDCORE pins: Power the core, including the processor, the embedded memories and the

peripherals; voltage ranges from 1.08V to 1.32V, 1.2V nominal.

• VDDIOM0 and VDDIOM1 pins: Power the External Bus Interface 0 I/O lines and the External

Bus Interface 1 I/O lines, respectively; voltage ranges between 1.65V and 1.95V (1.8V

nominal) or between 3.0V and 3.6V (3.3V nominal).

• VDDIOP0 pins: Power the Peripheral I/O lines and the USB transceivers; voltage ranges from

2.7V to 3.6V, 3.3V nominal.

• VDDIOP1 pins: Power the Peripheral I/O lines involving the Image Sensor Interface; voltage

ranges from 1.65V to 3.6V, 1.8V, 2.5V, 3V or 3.3V nominal.

• VDDBU pin: Powers the Slow Clock oscillator and a part of the System Controller; voltage

ranges from 1.08V to 1.32V, 1.2V nominal.

• VDDPLL pin: Powers the PLL cells; voltage ranges from 3.0V to 3.6V, 3.3V nominal.

• VDDOSC pin: Powers the Main Oscillator cells; voltage ranges from 3.0V to 3.6V, L3.3V

nominal.

The power supplies VDDIOM0, VDDIOM1 and VDDIOP0, VDDIOP1 are identified in the pinout

table and the multiplexing tables. These supplies enable the user to power the device differently

for interfacing with memories and for interfacing with peripherals.

Ground pins GND are common to VDDOSC, VDDCORE, VDDIOM0, VDDIOM1, VDDIOP0 and

VDDIOP1 pins power supplies. Separated ground pins are provided for VDDBU and VDDPLL.

These ground pins are respectively GNDBU and GNDPLL.

5.2

Power Consumption

The AT91SAM9263 consumes about 700 µA (worst case) of static current on VDDCORE at

25°C. This static current rises at up to 7 mA if the temperature increases to 85°C.

On VDDBU, the current does not exceed 3 µA @25°C, but can rise at up to 20 µA @85°C. An

automatic switch to VDDCORE guarantees low power consumption on the battery when the sys-

tem is on.

For dynamic power consumption, the AT91SAM9263 consumes a maximum of 70 mA on

VDDCORE at maximum conditions (1.2V, 25°C, processor running full-performance algorithm).

5.3

Programmable I/O Lines Power Supplies

The power supply pins VDDIOM0 and VDDIOM1 accept two voltage ranges. This allows the

device to reach its maximum speed, either out of 1.8V or 3.0V external memories.

The maximum speed is 100 MHz on the pin SDCK (SDRAM Clock) loaded with 10 pF. The other

signals (control, address and data signals) do not go over 50 MHz, loaded with 30 pF for power

supply at 1.8V and 50 pF for power supply at 3.3V.

The voltage ranges are determined by programming registers in the Chip Configuration registers

located in the Matrix User Interface.

At reset, the selected voltage defaults to 3.3V nominal and power supply pins can accept either

1.8V or 3.3V. However, the device cannot reach its maximum speed if the voltage supplied to

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