File name 5990-4043EN Properly Powering On and Off Multiple Power Inputs in Embedded Designs - Application Not
Properly Powering On and Off Multiple
Power Inputs in Embedded Designs
This is the irst in a
series of application
notes that addresses
in embedded designs.
Introduction this is a costly measure that still has limitations in timing accuracy. The
other option is to employ hardware-timed switching. This comes with
If you are designing embedded systems, you face various power a high time overhead and extra cost, since you need to either create
optimization and power characterization hurdles throughout the custom hardware or configure a DIO card to accurately time switch
design process. You know what you want to output, simulate and closures. These sequencing configurations often need to be reconfig-
measure--but you need a whole "toolbox" of instruments and ured each time the design changes or a new design is started.
hardware to do the job. Properly configuring the various tools into an Setting up various slew rates on power inputs when you are using
accurate, dependable solution can be difficult and time consuming. fixed regulator circuits requires some type of RC network at the output.
When you need to rerun a test later, you may have to repeat the whole Once again, this is an inflexible solution since it cannot be easily
time-intensive process of configuring your test setup. adjusted. Controlling slew rate on programmable power supplies may
The challenges you face can be divided into three categories: properly be possible through programming if you are working with a high-
powering on and off multiple power inputs, characterizing power performance supply. Otherwise, you will need to use some type of RC
needs under dynamic load conditions and simulating real-world power network on the output of the supplies.
conditions. This application note will focus on properly powering on
and off multiple power inputs in an embedded design. We will discuss Product Features
a simple way to overcome power sequencing challenges without the
need for a costly toolbox of hardware. Solution
The power input challenges embedded design engineers face can
Properly Powering On and Off be solved with the Keysight Technologies, Inc. N6705A DC Power
Multiple Power Inputs Analyzer. The N6705A provides four programmable power supply