DS1836 데이터 시트보기 (PDF) - Maxim Integrated

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DS1836

3.3V/5V Micro Manager

Maxim Integrated 

OPERATION

DS1836A/B/C/D

Power Monitor

The DS1836 provides the functions of detecting out-of-tolerance conditions on a 3.3V or 5V power

supply and warning a processor-based system of impending power failure. When VCC is detected as out of

tolerance the RST will be forced active. When VCC returns to a valid state the RST will remain active for

about 350ms and then return to an inactive state until the next VCC out-of-tolerance condition.

On power-up reset is kept active for approximately 350ms after the power supply input has reached the

selected tolerance. This allows the power supply and system power to stabilize before RST is released.

Power Switch (DS1836A & B)

The DS1836 switches the VOUT output between VCC and VBAT. On the initial power-up, VOUT draws

current from the VBAT input until VCC exceeds 3.9V. When VCC exceeds 3.9V VOUT switches from VBAT

to VCC and will not switch back to VBAT until VCC drops below 3.8V. When VCC is below 3.8V, power

will be drawn from the supply with the highest voltage: either VCC or VBAT.

Power Switch (DS1836C & D)

The DS1836 switches the VOUT output between VCC and VBAT. On the initial power up, VOUT draws

current from the VBAT input until VCC exceeds 2.8V. When VCC exceeds 2.8V VOUT switches from VBAT

to VCC and will not switch back to VBAT until VCC drops below 2.6V. When VCC is below 2.6V, power

will be drawn from the supply with the highest voltage either VCC or VBAT.

BLOCK DIAGRAM Figure 1

* DS1836B and DS1836D

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