DS1312

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NOTE: The DS1312 cannot constantly monitor an attached battery because such monitoring would

drastically reduce the life of the battery. As a result, the DS1312 only tests the battery for one second out

of every 24 hours and does not monitor the battery in any way between tests. If a good battery (one that

is then reattached to the DS1312, the battery may not be tested until the next scheduled test.

NOTE: Battery monitoring is only a useful technique when testing can be done regularly over the entire

systems which are powered-down for excessively long periods can completely drain their lithium cells

without receiving any advanced warning. To prevent such an occurrence, systems using the DS1312

battery monitoring feature should be powered–up periodically (at least once every few months) in order

data integrity should be checked via checksum or other technique.

POWER MONITORING

DS1312S and DS1312E varieties have an additional reset pin. These varieties detect out-of-tolerance

RST

. Reset occurs in the range of 4.75 to 4.5 volts (5% tolerance) when the TOL pin is connected to

RST

FRESHNESS SEAL MODE

leave Freshness Seal Mode. This mode allows a battery to be attached during manufacturing but not used

until after the system has been activated for the first time. As a result, no battery energy is drained during

storage and shipping.