at572d740 ATMEL Corporation, at572d740 Datasheet - Page 19

• Manufacturer Part Number: at572d740
• Description: Diopsis 740 Dual Core Dsp
• Manufacturer: ATMEL Corporation

Power Dissipation
Table 8. Power Dissipation
7001AS–DPS–03/04
Parameters
Idd
Idd
Idd
Idd
Idd
peak
high
no ext
sys mode
rst
Idd IO (3.3V) mA
330
120
25
25
10
The D740 has three kinds of power supply pins:
•
•
•
The total power dissipation is the sum of two basic contributions:
P
P
The following table defines the current consumption on different conditions:
•
•
•
•
•
•
•
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:
P
mode
P
mode
Note:
IO
CORE
CORE
IO
represents the contribute due to the IO pads current and the output load current.
= ((%
) + (%
) + (%
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)
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%
typical conditions
P
represents the contribute due to the internal activity current.
= ((%
D
peak
high
no ext
sys mode
rst
Idd
considerable for also for hard applications where all data bits do not toggle every cycle.
= P
peak
rst
rst
= D740 under reset
= mAgic FFT; both mAgic and ARM ext mem read and written alternatively
peak
= mAgic FFT; both mAgic and ARM ext mem written 100% with continuous
peak
× Idd
× Idd
= mAgic FFT; ARM FLASH access 100%; no mAgic ext mem access
IO
× Idd
+ P
= mAgic in system mode; ARM FLASH accesses 100%;
represents worst-case processor operation (for Idd IO particularly) and it is not
Idd CORE (1.8V) mA
460
400
390
100
160
× Idd
CORE
rst
rst
peak
)) x 1.8
)) x 3.3
peak
) + (%
) + (%
high
high
× Idd
× Idd
high
Idd IO (3.3V) mA
425
155
35
35
15
high
) + (%
) + (%
no ext
no ext
× Idd
worst conditions
× Idd
no ext
no ext
Idd CORE (1.8V) mA
600
520
500
135
205
) + (%
AT572D740
) + (%
sys mode
sys mode
× Idd
× Idd
19
sys
sys