MC56F8346 Freescale Semiconductor, Inc, MC56F8346 Datasheet - Page 166

• Manufacturer Part Number: MC56F8346
• Description: 56f8300 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

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Cload is expressed in pF
Because of the low duty cycle on most device pins, power dissipation due to capacitive loads was found
to be fairly low when averaged over a period of time. The one possible exception to this is if the chip is
using the external address and data buses at a rate approaching the maximum system rate. In this case,
power from these buses can be significant.
E, the external [static component], reflects the effects of placing resistive loads on the outputs of the
2
device. Sum the total of all V
/R or IV to arrive at the resistive load contribution to power. Assume V =
0.5 for the purposes of these rough calculations. For instance, if there is a total of 8 PWM outputs driving
10mA into LEDs, then P = 8*.5*.01 = 40mW.
In previous discussions, power consumption due to parasitics associated with pure input pins is ignored,
as it is assumed to be negligible.
56F8346 Technical Data, Rev. 15
166
Freescale Semiconductor
Preliminary