DS1312 データシートの表示（PDF） - Unspecified

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DS1312

Nonvolatile Controller with Lithium Battery Monitor

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DS1312

Nonvolatile Controller with Lithium

Battery Monitor

POWER MONITORING

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

and warn a processor-based system of impending power failure. When VCCI falls below the trip point level defined by the TOL pin

(VCCTP), the VCCI comparator activates the reset signal . Reset occurs in the range of 4.75 to 4.5 volts (5% tolerance) when the

TOL pin is connected to GND or in the range of 4.5 to 4.25 volts (10% tolerance) when TOL is connected to VCCO.

also serves as a power-on reset during power-up. After VCCI exceeds VCCTP,

will be held active for 200 ms nominal

(tRPU). This reset period is sufficiently long to prevent system operation during power-on transients and to allow tREC to expire.

has an open-drain output driver.

FRESHNESS SEAL MODE

When the battery is first attached to the DS1312 without Vcc power applied, the device does not immediately provide

battery-backup power on VCCO. Only after VCCI exceeds VCCTP will the DS1312 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 BIAGRAM Figure 1

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