DS1831CS 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1831CS

3.3V/2.5V Multi-Supply MicroMonitor

Dallas Semiconductor -> Maxim Integrated 

DS1831C/D/E

OPERATION – PUSHBUTTON STATUS

The DS1831E provides a master pushbutton status open drain output. The PBST output indicates the

status of the most recent reset condition. If the last reset was generated by the master pushbutton input it

would maintain a low condition until cleared by another event (except the master pushbutton) generating

a reset. Once cleared it will remain high until the master pushbutton is pulled low generating a reset

condition. The PBST output is open drain and will require a pull-up resistor on the output to maintain a

valid condition. The value of the pull up resistor is not critical in most cases but must be set low enough

to pull the output to a high state. A common value used is 10 kΩs (See Figure 6).

DS1831E APPLICATION EXAMPLE Figure 6

2.5V

3.3V Supply

VCC

VSENSE2

VSENSE1

IN2.5V 1

16

RST2.5V 2

15

TOL2.5V 3

14

TD2.5V

PBRST2.5V

IN1

IN2

GND

4

13

DS1831E

5

12

6

11

7

10

8

9

IN3.3V

RST3.3V

TOL3.3V

TD3.3V

PBST

NMI1

NMI2

MPBRST

10k

VCC

10 kΩ

OUTPUT VALID CONDITIONS

The DS1831 can maintain valid outputs as long as one input remains above 1.0 volt. Accurate voltage

monitoring additionally requires that either the 3.3 volt IN or 2.5 volt IN input be above 1.5 volts. If this

condition is not met and at least one of the supply inputs are at or above 1.0 volt all outputs are

maintained in the active condition. The DS1831 requires pull-up resistors on the outputs to maintain a

valid output. The value of the pull up resistor is not critical in most cases but must be set low enough to

pull the output to a high state. A common pull-up resistor value used is 10 kΩs (See Figure 7).

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