ADSP-SC583 datasheet(86/168 Pages) AD

86 / 168 page

Rev. PrF

Page 86 of 168

February 2016

ADSP-SC582/583/584/587/589/ADSP-21583/584/587 Preliminary Technical Data

The following equation is used to compute the power dissipa-

tion when the FFT accelerator is used:

IDDINT_ACCL_DYN (mA) = ASFACCL × fSYSCLK (MHz) × VDD_INT

(V)

Clock Current

The dynamic clock currents provide the total power dissipated

by all transistors switching in the clock paths. The power dissi-

pated by each clock domain is dependent on voltage (VDD_INT),

operating frequency and a unique scaling factor.

IDDINT_SYSCLK_DYN (mA) = 0.80 × fSYSCLK (MHz) × VDD_INT (V)

IDDINT_SCLK0_DYN (mA) = 0.40 × fSCLK0 (MHz) × VDD_INT (V)

IDDINT_SCLK1_DYN (mA) = 0.04 × fSCLK1 (MHz) × VDD_INT (V)

IDDINT_DCLK_DYN (mA) = 0.14 × fDCLK (MHz) × VDD_INT (V)

IDDINT_OCLK_DYN (mA) = 0.005 × fOCLK (MHz) × VDD_INT (V)

Current from High Speed Peripheral Operation

The following modules contribute significantly to power dissi-

pation and a single term is added when they are used.

IDDINT_USB_DYN = 20 mA (if USB enabled)

IDDINT_MLB_DYN = 10 mA (if MLB 6-pin interface is enabled)

IDDINT_GIGE_DYN = 10 mA (if Gigabit Ethernet MAC controller

is enabled)

Data Transmission Current

The data transmission current represents the power dissipated

when transmitting data. This current is proportional to the data

rate. Refer to the power calculator of this product to estimate

IDDINT_DMA_DR_DYN based on the bandwidth of the data

transfer.

Table 34. CCLK Dynamic Current per ARM Cortex-A5

Core (mA, with ASF = 1.00)

fCCLK (MHz)

Voltage (VDD_INT)

1.000

1.050

1.100

1.150

1.200

450

49.5

52.0

54.5

56.9

59.4

400

44.0

46.2

48.4

50.6

52.8

350

38.5

40.4

42.4

44.3

46.2

300

33.0

34.7

36.3

38.0

39.6

250

27.5

28.9

30.3

31.6

33.0

200

22.0

23.1

24.2

25.3

26.4

150

16.5

17.3

18.2

19.0

19.8

100

11.0

11.6

12.1

12.7

13.2

Table 35. Activity Scaling Factors for FFT Accelerator

(ASFA5)

IDDINT Power Vector

ASFACCL

Unused

0.0

IDD-TYPP

0.4

ADSP-SC583 Datasheet(PDF) 86 Page - Analog Devices

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