Reset Generator - Rabbit RabbitCore RCM3400 User Manual

The drain on the battery by the RCM3400 is typically 7.5 µA when no other power is sup-
plied. If a 165 mA·h battery is used, the battery can last about 2.5 years:
165 mA·h
----------------------- -
7.5 µA
The actual life in your application will depend on the current drawn by components not on
the RCM3400 and on the storage capacity of the battery. The RCM3400 does not drain the
battery while it is powered up normally.
Cycle the main power off/on on the RCM3400 after you install a backup battery for the
first time, and whenever you replace the battery. This step will minimize the current drawn
by the real-time clock oscillator circuit from the backup battery should the RCM3400
experience a loss of main power.
NOTE: Remember to cycle the main power off/on any time the RCM3400 is removed
from the Protoyping Board or motherboard since that is where the backup battery
would be located.
E.1.2 Reset Generator
The RCM3400 uses a reset generator to reset the Rabbit 3000 microprocessor when the volt-
age drops below the voltage necessary for reliable operation. The reset occurs between
2.85 V and 3.00 V, typically 2.93 V. The RCM3400 has a reset output, pin 33 on header J1.
142
= 2.5 years.
RabbitCore RCM3400