Datasheet

DS1321

5 of 13

FRESHNESS SEAL MODE

When the battery is first attached to the DS1321 without V

power applied, the device does not

immediately provide battery-backup power on V

CCO

. Only after V

CCI

exceeds V

CCTP

will the DS1321

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.

FUNCTIONAL BLOCK DIAGRAM Figure 2