MC56F8006DEMO Freescale Semiconductor, MC56F8006DEMO Datasheet - Page 66

• Manufacturer Part Number: MC56F8006DEMO
• Description: DEMO BOARD FOR MC56F8006
• Manufacturer: Freescale Semiconductor
• Type: DSPr

Specifications of MC56F8006DEMO

• Contents: Board
• Processor To Be Evaluated: MC56F8006
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Freescale
• Core Architecture: 56800/E
• Core Sub-architecture: 56800/E
• Silicon Core Number: MC56F
• Silicon Family Name: MC56F80xx
• Rohs Compliant: Yes
• For Use With/related Products: MC56F8006
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Specifications
Power consumption is given by the following equation:
A, the internal [static] component, is comprised of the DC bias currents for the oscillator, leakage currents, PLL, and voltage
references. These sources operate independently of processor state or operating frequency.
B, the internal [state-dependent] component, reflects the supply current required by certain on-chip resources only when those
resources are in use. These include RAM, flash memory, and the ADCs.
C, the internal [dynamic] component, is classic C*V
standard cell logic.
D, the external [dynamic] component, reflects power dissipated on-chip as a result of capacitive loading on the external pins of
the chip. This is also commonly described as C*V
reveal that the power-versus-load curve does have a non-zero Y-intercept.
Power due to capacitive loading on output pins is (first order) a function of the capacitive load and frequency at which the
outputs change.
In these cases:
where:
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.
E, the external [static component], reflects the effects of placing resistive loads on the outputs of the device. Sum the total of
all V
For instance, if there is a total of eight PWM outputs driving 10 mA into LEDs, then P = 8*0.5*0.01 = 40 mW.
In previous discussions, power consumption due to parasitics associated with pure input pins is ignored, as it is assumed to be
negligible.
66
•
•
•
2
/R or IV to arrive at the resistive load contribution to power. Assume V = 0.5 for the purposes of these rough calculations.
Summation is performed over all output pins with capacitive loads
Total power is expressed in mW
C
load
is expressed in pF
Table 38
TotalPower = ((Intercept + Slope*Cload)*frequency/10 MHz)
provides coefficients for calculating power dissipated in the I/O cells as a function of capacitive load.
MC56F8006/MC56F8002 Digital Signal Controller, Rev. 3
Total power =
Table 38. I/O Loading Coefficients at 10 MHz
8 mA drive
4 mA drive
2
*F, although simulations on two of the I/O cell types used on the 56800E
+C:
+D:
+B: internal [state-dependent component]
+E:
2
A:
*F CMOS power dissipation corresponding to the 56800E core and
external [dynamic component]
internal [dynamic component]
external [static component]
internal [static component]
Intercept
1.15 mW
1.3
0.11 mW/pF
0.11 mW/pF
Slope
Freescale Semiconductor
Eqn. 1
Eqn. 2