Getting Started
then the power. Similarly, the current drawn by V CCIO is measured across
R95 and R99. Using the same technique as described for V CCINT allows
you to calculate the total power being consumed by the MAX II device.
1
This circuit uses resistors with a specified variance of 5%, which
means that the power measurement is not precise. This circuit is
provided to give users a general understanding of the MAX II
device power consumption. Users who need a precise power
measurement should remove the resistors and measure the
current with a multimeter across one of the pads where R109
and R113 reside. Users concerned with power consumption
should also consult the Understanding & Evaluating Power in
MAX II Devices chapter of the MAX II Device Handbook .
On-Board Circuit
The MAX II device current draw is measured across two 0.33 ohm
resistors via a current sense device. The output of this device is fed to an
A/D converter that generates a digital (serial) output to the MAX II
device. The value of this number provides an indication of the current
that is consumed by the MAX II device, allowing you to determine how
much power the MAX II device is consuming.
f
Refer to the MAX II Development Board Data Sheet and the MAX II
development board schematics for more information about the on-board
circuitry.
Using the Demo
To use this demo, first program the MAX II device with the
LowPowerDemo.pof file in the < install directory >/ Examples/
HW/Demos directory. (Refer to “Programming the MAX II Device” on
page 2–4 for details on how to load POF files into the MAX II device.)
After programming finishes, the LCD will read:
Current Is 24 mA
000 FF’s
The switches control the operation of this demo:
Altera Corporation
July 2005
Switch 1 = reset
Switch 2 = increase the number of flip-flops that are toggling by 150
Switch 3 = decrease the number of flip-flops that are toggling by 150
Switch 4 = double the rate at which the flip-flops are toggling
Development Kit Version 1.1.0 2–13
MAX II Development Kit Getting Started User Guide
相关PDF资料
DK-N2EVAL-3C25N KIT DEV NIOS II CYCLONE III ED.
DK-NIOS-2C35N NIOS II KIT W/CYCLONE II EP2C35N
DK-NIOS-2S60N NIOS II KIT W/STRATIX II EP2S60N
DK-PCI-2C35N PCI KIT W/CYCLONE II EP2C35N
DK-PCIE-2SGX90N PCIE KIT W/S II GX EP2SGX90N
DK-SI-2SGX90N SI KIT W/SII GX EP2SGX90N
DK-SI-4SGX230N KIT DEV STRATIX IV 4SGX230N/C2
DK-START-3C25N KIT STARTER CYCLONE III EP3C25
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