MNSC140CORE datasheet(77/80 Pages) FREESCALE

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Power Considerations

MSC8102 Quad Core Digital Signal Processor, Rev. 12

Freescale Semiconductor

4-5

4.4 Power Considerations

The internal power dissipation consists of three components:

PINT = PTCORE + PSIU + PBUSES + PPERIPH

The power dissipation depends on the operating frequency of the different portions of the chip. To determine the

power dissipation at a given frequency, the following equations should be applied:

PCORE (fc) = ((PCORE – PLCO)/275) × fc + PLCO

PTCORE (fc) = (PCORE × 4)

PSIU (fc) = ((PSIU – PLSI)/91.67) × fc + PLSI

PPERIPH (fc) = ((PPERIPH – PLPE)/91.67) × fc + PLPE

PBUSES (fc) = PBUSES /91.67 × fc

Where,

fc is the operating frequency in MHz and all power numbers are in mW

PLCO is the SC140 Core leakage power

PLSI is the SIU leakage power

PLPE is the peripheral leakage power

To determine a total power dissipation in a specific application, the following equation should be applied for each

I/O output pin:

P = C

× VDDH2 × fs × 10–3

Equation 1

Where:

P = power in mW

C = load capacitance in pF

fs = output switching frequency in MHz.

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