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This is a request to change the AccuVote
firmware code to disable (or delay) displaying or checking for a low power
supply battery condition at power up. Currently, this message occurs at
power up even with the AC plugged in. Some customers get anxious that
their batteries are low, even though the condition does not exist.
We should never show a "BATTERY LOW" condition if
the ACFAIL is false.
The following occurs within a couple of seconds
from power up:
- When powering up an AccuVote, the high
capacitance on the 15V system takes a second or so to charge up.
- The BATT LOW signal from the Power Supply is
true while the 15V system is charging. All this time, the ACFAIL
signal is false.
- While the 15V system is trying to reach its
full voltage, the CPU starts executing code because the 5V system is already
stable and the reset delay has expired (approx 500 msec).
- The code appears to check the CPU's inputs,
sees the BATT LOW is true, and displays a "BATTERY LOW" message on
the LCD.
- After the 15V system has charged past the
BATT LOW threshold, the BATT LOW signal is now false.
- The CPU no longer sees a true BATT LOW and
therefore doesn't display the LCD message until the condition does actually
exist or the next power up.
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