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| DS1321 Datasheet, PDF (5/12 Pages) Dallas Semiconductor – Flexible Nonvolatile Controller with Lithium Battery Monitor | |||
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DS1321
FRESHNESS SEAL MODE
When the battery is first attached to the DS1321 without VCC power applied, the device does not
immediately provide battery-backup power on VCCO. Only after VCCI exceeds VCCTP and later falls below
both VCCTP and VBAT will the DS1321 leave Freshness Seal Mode and provide battery-backup power.
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
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