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AT572D740

7001AS–DPS–03/04

Power Dissipation

The D740 has three kinds of power supply pins:

•

VDDCORE pins, which power the chip core (1.8V)

•

VDDIO pins, which power the I/O lines (3.3V)

•

VDDPLL pins, which power the oscillator and PLL cells (1.8V)

The total power dissipation is the sum of two basic contributions:

P

P

P

The following table defines the current consumption on different conditions:

•

Idd

toggling data

•

Idd

100% with 50% toggling data

•

Idd

•

Idd

•

Idd

•

typical condition = typical process; Tj = 25°; Vdd = nom

•

worst condition = worst process; Tj = 100°; Vdd = nom + 10%

To estimate power consumption for a specific application use the following equation

where % is the amount of time your program spends in that state and each “Idd” contrib-

ute corresponds to “IO” or “CORE” columns:

Note:

Idd

considerable for also for hard applications where all data bits do not toggle every cycle.

Table 8. Power Dissipation

Parameters

typical conditions

worst conditions

Idd IO (3.3V) mA

Idd CORE (1.8V) mA

Idd IO (3.3V) mA

Idd CORE (1.8V) mA

Idd

peak

330

460

425

600

120

400

155

520

Idd

no ext

25

390

35

500

Idd

sys mode

25

100

35

135

10

160

15

205