WDT
Watchdog timer
Supervises a qualifying activity signal and operates its output when the documented watchdog timing condition is violated.
Schematic
Symbols · PG
Power-good indication
In plain English
What does Power-good indication mean?
A power-good signal reports whether the source's specified acceptable-supply conditions are satisfied.
A simple example
A downstream circuit can use this status when deciding whether to enable its operation.
What the drawings help you do
Draw power-good as a status signal from its source or supervisor to the receiving controller. It is information about specified acceptable conditions, not the supply conductor itself. State the active level and timing requirements from the selected source so the receiving circuit interprets it correctly.
- Active level
- The signal level representing the stated condition.
- Status signal
- Information describing a condition rather than carrying the load’s operating power.
Before using this reference
- Identify the device generating the indication.
- Show the active level and receiving input.
- Reference acceptable conditions and assertion/release timing.
Does power-good measure how much power is available?
Not generally. It reports whether the generating device’s defined conditions are satisfied. It does not automatically report spare capacity, complete system readiness or a continuously measured power value.
Read the source: Supply supervision and reset
Schematic · PG
A distinction that matters
Power-good timing and thresholds come from the selected source or supervisor.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Supply supervision and reset
Supply supervision and reset: public technical context for the named function. Product and compliance details remain with the publisher.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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An identified interface converting electrical power between documented circuit forms.
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