DS1831ES 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

DS1831ES

3.3V/2.5V Multisupply MicroMonitor

Maxim Integrated 

PUSHBUTTON RESET SEQUENCING Figure 2

2.5V Supply

3.3V Supply

IN2.5V

RST2.5V

TOL2.5V

TD2.5V

PBRST2.5V

1

16

2

15

DS1831C

3

14

4

13

5

12

IN3.3V

RST3.3V

TOL3.3V

TD3.3V

PBRST3.3V

GND

DS1831C/D/E

NOTE: The RST 2.5 volt output is connected to the IN3.3V via a 100kW resistor in the pushbutton input and

therefore does not require a pull-up resistor (an addition pull up can be used to accelerate responses.) If an

external pull-up is used in this example it must be connected to the 3.3V power supply.

OPERATION—PUSHBUTTON RESET

The DS1831 provides three pushbutton inputs for manual reset of the device. Pushbutton inputs for the

3.3V reset, 2.5V reset, and a master pushbutton reset (DS1831C and DS1831D only) input; provide

multiple options for system control. The 3.3V pushbutton reset and 2.5V pushbutton resets provide a

simple manual reset for the associated reset output; while the master pushbutton reset forces all resets and

NMI outputs active low.

The 2.5V reset pushbutton input and the 3.3V reset pushbutton input provide manual reset control for

each associated reset output. When the output associated with a pushbutton input is not active, a

pushbutton reset can be generated by pulling the associated PBRST pin low for at least 20µs. When the

pushbutton is held low the reset will be forced active and will remain active for a reset cycle after the

pushbutton is released. See Figure 2 for an application example that allows a user to sequence the reset

outputs.

A master pushbutton reset cycle can be started if at least one voltage input (IN2.5V, IN3.3V, IN1, or IN2) is

in tolerance and at least one output is active. A master pushbutton reset is generated by pulling the

MPBRST pin low for at least 20µs. When the pushbutton is held low all outputs are forced active and will

remain active for a reset or NMI time delay after the pushbutton is released. The Master Pushbutton input

is pulled high through an internal 100kW pull up resistor and debounced via internal circuitry. See Figure

3 for an application example. Figures 4 and 5 for the timing diagram.

The 2.5V and 3.3V pushbutton reset inputs are pulled high through an internal 100kW pull up resistor to

the voltage input, which is associated with that pushbutton. The master pushbutton is pulled to the greater

of the IN2.5V and IN3.3V inputs.

5 of 15

Share Link: