DS1831C 查看數據表（PDF） - Maxim Integrated

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DS1831C

3.3V/2.5V Multisupply MicroMonitor

Maxim Integrated 

DS1831C/D/E

OPERATION—POWER MONITOR

The DS1831 provides the functions of detecting out-of-tolerance conditions on a 3.3V (or 3V) and 2.5V

power supply and warning a processor based system of impending power failure. When an input is

detected as out-of-tolerance on either voltage input the RST for that supply will be forced active low.

When that input returns to a valid state the associated RST will remain active for the time delay selected

with the associated TD input and then return to an inactive state until the next input out-of-tolerance

condition.

On power-up both resets are kept active for the selected reset time after the associated power supply input

has reached the selected tolerance. This allows the power supply and system power to stabilize before

RST is released.

All internal operating current for the DS1831 will be supplied by either the IN3.3V or IN2.5V input which

ever has the highest voltage level.

OPERATION—TOLERANCE SELECT

The DS1831 provides two TOL inputs for individual customization of the DS1831 to specific application

requirements. If the TOL for the 2.5V supply is tied to the 2.5V input a 5% tolerance is selected. If the

TOL is connected to ground a 10% tolerance is selected or if it is left unconnected a 15% tolerance is

selected. If the TOL for the 3.3V supply is tied to the 3.3V input a 5% tolerance is selected, a 10%

tolerance is selected if it is connected to ground, and a 20% tolerance is selected if the input is left

unconnected. These tolerance conditions are set at power up and can only be changed by power cycling

the device.

OPERATION—RESET TIME-DELAY SELECT

The DS1831 provides two TD inputs for individual customization of reset time delays and an additional

one for the DS1831D watchdog. TD inputs select time delays for the IN2.5V and IN3.3V resets outputs and

the Watchdog on the DS1831D. The reset time delays are shown in Table 1. These allow the selection of

minimum delays of 10ms, 100ms, and 1000ms.

Wiring an individual reset output to the pushbutton input of the other voltage reset allows custom reset

timings or allows for the sequencing of the reset outputs. See Figure 2.

These time delays are set at power-up and cannot be changed after the device reaches an in-tolerance

condition.

TD INPUTS/RESET AND WATCHDOG TIME-DELAYS Table 1

RESET TIME-DELAY

TD

MIN

TYP

MAX

GND

10ms

16ms

20ms

Float

100ms

160ms

200ms

VCC

1000ms

1600ms

2000ms

4 of 15

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