Power Measurements; Power-On-Self Test - Analog Devices ADSP-21479 EZ-Board Manual

Power Measurements

Several locations are provided for measuring the current draw from vari-
ous power planes. Precision 0.05 ohm shunt resistors are available on the
VDDRTC, VDDEXT, and VDDINT voltage domains. The associated
jumper on connectors
draw. Once the jumper is removed, voltage across the resistor can be mea-
sured using an oscilloscope. Once voltage is measured, current can be
calculated by dividing voltage by 0.05. For the highest accuracy, a differ-
ential probe should be used for measuring voltage across the resistor.
For more information, see
page 2-27, "VDDEXT Power Connector (P6)" on page
"VDDINT Power Connector (P7)" on page

Power-On-Self Test

The power-on-self-test program (POST) tests all EZ-Board peripherals
and validates functionality as well as connectivity to the processor. Once
assembled, each EZ-Board is fully tested for an extended period of time
with a POST. All EZ-Boards are shipped with the POST preloaded into
one of their on-board flash memories. The POST is executed by resetting
the board and pressing the proper push button(s). The POST also can be
used for reference in custom software designs or hardware troubleshoot-
ing. Note that the source code for the POST program is included in the
installation directory along with the readme file, which describes how the
EZ-board is configured to run a POST.

The POST program is only available when using VisualDSP++.
ADSP-21479 EZ-Board Evaluation System Manual
Using The ADSP-21479 EZ-Board
, , or must be removed to measure current
P3 P6 P7
"VDDRTC Power Connector (P3)" on
2-28, and
2-28.
1-27