DS1831B+ datasheet, PDF - EEWORLD Datasheet

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DS1831B+: DescriptionIC MULTIMN 5/3.3V WDOG PB 16-DIP; CategoryPower/power management The power supply circuit; File Size194KB，14 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1831B+ Overview

IC MULTIMN 5/3.3V WDOG PB 16-DIP

DS1831B+ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Maxim
package instruction	DIP,
Reach Compliance Code	compliant
ECCN code	EAR99
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDIP-T16
length	19.175 mm
Humidity sensitivity level	1
Number of channels	4
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	DIP
Package shape	RECTANGULAR
Package form	IN-LINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Maximum seat height	4.572 mm
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	1 V
Nominal supply voltage (Vsup)	3.3 V
surface mount	NO
Temperature level	INDUSTRIAL
Terminal surface	NOT SPECIFIED
Terminal form	THROUGH-HOLE
Terminal pitch	2.54 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	7.62 mm
Base Number Matches	1

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DS1831/A/B

Multisupply Micromonitor

www.maxim-ic.com

FEATURES

5V power-on reset

3.3V power-on reset

Two referenced comparators with separate

outputs for monitoring additional supplies

Internal power is drawn from higher of either

the IN

input or the IN

3.3V

input

Excellent for systems designed to operate

with multiple power supplies

Asserts resets during power transients

Pushbutton reset input for system override

Maintains reset for user configurable times

of 10ms, 100ms, or 1s

Watchdog timer for software monitoring

(DS1831A)

Precision temperature-compensated voltage

reference and voltage sensor

16 pin DIP and 16 pin 150mil SO available

Operating Temperature of -40°C to +85°C

DS1831A

RST

TOL

PBRST

IN1

GND

3.3V

RST

3.3V

TOL

3.3V

PBRST

3.3V

NMI1

WDS

PIN ASSIGNMENT

DS1831

RST

TOL

PBRST

IN1

IN2

GND

3.3V

RST

3.3V

TOL

3.3V

PBRST

3.3V

NMI1

NMI2

MPBRST

16-Pin (300mil) DIP

16-Pin (150mil) SO

DS1831B

RST

TOL

PBRST

IN1

IN2

GND

3.3V

RST

3.3V

TOL

3.3V

PBST

NMI1

NMI2

MPBRST

16-Pin (300mil) DIP

16-Pin (150mil) SO

16-Pin (300mil) DIP

16-Pin (150mil) SO

DESCRIPTION

The DS1831 multisupply monitor and reset monitors up to four system voltages: 5V supply, 3.3V (or 3V)

supply, and two additional user configurable voltage monitors. DS1831 power for internal operation

comes from the higher voltage level of the 3.3V input or the 5V input. One of these inputs must be greater

than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 5V reset, the

1 of 14

060303

DS1831/A/B

OPERATION—POWER MONITOR

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

3.3V

or IN

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 5V supply is tied to the 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 DS1831A watchdog. TD inputs select time delays for the IN

and IN

3.3V

resets outputs and

the Watchdog on the DS1831A. 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 push-button 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

GND

Float

MIN

10ms

100ms

1000ms

RESET TIME-DELAY

TYP

16ms

160ms

1600ms

MAX

20ms

200ms

2000ms

3 of 14

DS1831/A/B

PUSHBUTTON RESET SEQUENCING

Figure 2

5V Supply

3.3V Supply

RST

TOL

DS1831

3.3V

RST

3.3V

TOL

3.3V

PBRST

3.3V

PBRST

GND

NOTE: The

RST

output is connected to the IN

3.3V

via a 100 kW resistor in the push-button 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, 5V reset, and a master pushbutton reset (DS1831 and DS1831B only) input; provide multiple

options for system control. The 3.3V pushbutton reset and 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 5V reset pushbutton input and the 3.3V reset pushbutton input provide manual reset control input 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 (IN

, IN

3.3V

, 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 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 IN

and IN

3.3V

inputs.

4 of 14

DS1831B+ Related Products

	DS1831B+	DS1831BS+T&R;	DS1831AS+T&R;	DS1831S+T&R;	DS1831S/T&R;	DS1831AS/T&R;	DS1831BS/T&R;
Description	IC MULTIMN 5/3.3V WDOG PB 16-DIP	IC MULTIMN 5/3.3V WDOG PB 16SOIC	IC MULTIMON 5V/3.3V WDOG 16-SOIC	IC MULTIMON 5V/3.3V 16-SOIC	IC MULTIMON 5V/3.3V 16-SOIC	IC MULTIMON 5V/3.3V WDOG 16-SOIC	IC MULTIMN 5/3.3V WDOG PB 16SOIC
type	-	multi-pressure monitor	multi-pressure monitor	multi-pressure monitor	multi-pressure monitor	multi-pressure monitor	multi-pressure monitor
Monitored voltage number	-	4	3	4	4	3	4
output	-	Open drain or open collector	Open drain or open collector	Open drain or open collector	Open drain or open collector	Open drain or open collector	Open drain or open collector
reset	-	Low effective	Low effective	Low effective	Low effective	Low effective	Low effective
reset timeout	-	Minimum 10 ms; 100 ms; 1,000 ms	Minimum 10 ms; 100 ms; 1,000 ms	Minimum 10 ms; 100 ms; 1,000 ms	Minimum 10 ms; 100 ms; 1,000 ms	Minimum 10 ms; 100 ms; 1,000 ms	Minimum 10 ms; 100 ms; 1,000 ms
Voltage - Threshold	-	3.3V, 5V, adjustable, adjustable	3.3V, 5V, adjustable	3.3V, 5V, adjustable, adjustable	3.3V, 5V, adjustable, adjustable	3.3V, 5V, adjustable	3.3V, 5V, adjustable, adjustable
Operating temperature	-	-40°C ~ 85°C（TA）	-40°C ~ 85°C（TA）	-40°C ~ 85°C（TA）	-40°C ~ 85°C（TA）	-40°C ~ 85°C（TA）	-40°C ~ 85°C（TA）
Installation type	-	surface mount	surface mount	surface mount	surface mount	surface mount	surface mount
Package/casing	-	16-SOIC (0.154", 3.90mm wide)	16-SOIC (0.154", 3.90mm wide)	16-SOIC (0.154", 3.90mm wide)	16-SOIC (0.154", 3.90mm wide)	16-SOIC (0.154", 3.90mm wide)	16-SOIC (0.154", 3.90mm wide)
Supplier device packaging	-	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC

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