DS1706SESA datasheet, PDF - EEWORLD Datasheet

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DS1706SESA: DescriptionPower Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, 0.150 INCH, SOIC-8; CategoryPower/power management The power supply circuit; File Size144KB，10 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1706SESA Overview

Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, 0.150 INCH, SOIC-8

DS1706SESA Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	DALLAS
package instruction	0.150 INCH, SOIC-8
Reach Compliance Code	unknown
Other features	PUSHBUTTON RESET OPTION
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
Number of channels	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
power supply	5 V
Certification status	Not Qualified
Maximum supply current (Isup)	0.06 mA
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	1.2 V
Nominal supply voltage (Vsup)	3.3 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL

DS1706SESA Preview

DS1705/DS1706

3.3 and 5.0 Volt MicroMonitor

www.dalsemi.com

FEATURES

Halts and restarts an out-of-control

microprocessor

Holds microprocessor in check during power

transients

Automatically restarts microprocessor after

power failure

Monitors pushbutton for external override

Accurate 5%, 10% or 20% resets for 3.3V

systems and 5% or 10% resets for 5.0V

systems

Eliminates the need for discrete components

3.3V 20% tolerance for use with 3.0V

systems

Pin-compatible with the MAXIM

MAX705/MAX706 in 8-pin DIP, 8-pin SOIC,

and

µ-SOP

8-pin DIP, 8-pin SOIC and 8-pin

µ-SOP

packages

Industrial temperature range -40°C to +85°C

PIN ASSIGNMENT

PBRST

GND

WDS

RST

NMI

8-Pin DIP (300 -mil)

PBRST

GND

WDS

RST(*RST)

NMI

8-Pin SOIC (150-mil)

RST(*RST)

WDS

PBRST

NMI

GND

8-Pin

µ-SOP

(118-mil)

See Mech. Drawings Section

DS1705 and DS1706_R/S/T

(*DS1706L and DS1706P)

PIN DESCRIPTION

PBRST

GND

NMI

RST

*RST

WDS

- Pushbutton Reset Input

- Power Supply

- Ground

- Input

- Non-maskable Interrupt

- Strobe Input

- Active Low Reset Output

- Active High Reset Output

(DS1706P and DS1706L only)

- Watchdog Status Output

DESCRIPTION

The DS1705/DS1706 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor:

power supply, software execution, and external override. A precision temperature compensated reference

and comparator circuit monitor the status of V

at the device and at an upstream point for maximum

protection. When the sense input detects an out-of-tolerance condition a non-maskable interrupt is

generated. As the voltage at the device degrades, an internal power fail signal is generated which forces

1 of 10

071700

DS1705/DS1706

the reset to an active state. When V

returns to an in-tolerance condition, the reset signal is kept in the

active state for a minimum of 130 ms to allow the power supply and processor to stabilize.

The second function the DS1705/DS1706 performs is pushbutton reset control. The DS1705/DS1706

debounces the pushbutton input and guarantees an active reset pulse width of 130 ms minimum.

The third function is a watchdog timer. The DS1705/DS1706 has an internal timer that forces the WDO

signal to the active state if the strobe input is not driven low prior to time-out.

OPERATION

Power Monitor

The DS1705/DS1706 detects out-of-tolerance power supply conditions and warns a processor-based

system of impending power failure. When V

falls below the minimum V

tolerance, a comparator

outputs the

RST

(or RST) signal.

RST

(or RST) is an excellent control signal for a microprocessor, as

processing is stopped at the last possible moment of valid V

. On power-up,

RST

(or RST) are kept

active for a minimum of 130 ms to allow the power supply and processor to stabilize.

Pushbutton Reset

The DS1705/DS1706 provides an input pin for direct connection to a pushbutton reset (see Figure 2). The

pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such

that a

RST

(or RST) signal of at least 130 ms minimum will be generated. The 130 ms delay commences

as the pushbutton reset input is released from the low level. The pushbutton can be initiated by connecting

the

WDS

NMI

outputs to the

PBRST

input as shown in Figure 3.

Non-Maskable Interrupt

The DS1705/DS1706 generates a non-maskable interrupt (

NMI

) for early warning of a power failure. A

precision comparator monitors the voltage level at the IN pin relative to an on-chip reference generated

by an internal band gap. The IN pin is a high impedance input allowing for a user-defined sense point. An

external resistor voltage divider network (Figure 5) is used to interface with high voltage signals. This

sense point may be derived from a regulated supply or from a higher DC voltage level closer to the main

system power input. Since the IN trip point V

is 1.25 volts, the proper values for R1 and R2 can be

determined by the equation as shown in Figure 5. Proper operation of the DS1705/DS1706 requires that

the voltage at the IN pin be limited to V

. Therefore, the maximum allowable voltage at the supply being

monitored (V

MAX

) can also be derived as shown in Figure 5. A simple approach to solving the equation is

to select a value for R2 high enough to keep power consumption low, and solve for R1. The flexibility of

the IN input pin allows for detection of power loss at the earliest point in a power supply system,

maximizing the amount of time for system shutdown between

NMI

and

RST

(or RST).

When the supply being monitored decays to the voltage sense point, the DS1705/DS1706 pulses the

NMI

output to the active state for a minimum 200

µs.

The

NMI

power-fail detection circuitry also has built-in

hysteresis of 100

µV.

The supply must be below the voltage sense point for approximately 5

µs

before a

low

NMI

will be generated. In this way, power supply noise is removed from the monitoring function,

preventing false interrupts. During a power-up, any detected IN pin levels below V

by the comparator

are disabled from generating an interrupt until V

rises to V

CCTP

. As a result, any potential

NMI

pulse

will not be initiated until V

reaches V

CCTP

Connecting

NMI

PBRST

would allow non-maskable interrupt to generate an automatic reset when an

out-of-tolerance condition occurred in a monitored supply. An example is shown in Figure 3.

2 of 10

DS1705/DS1706

Watchdog Timer

The watchdog timer function forces

WDS

signals active when the

input is not clocked within the 1

second time-out period. Time-out of the watchdog starts when

RST

(or RST) becomes inactive. If a high-

to-low transition occurs on the

input pin prior to time-out, the watchdog timer is reset and begins to

time out again. If the watchdog timer is allowed to time out, the

WDS

signal is driven active (low) for a

minimum of 130 ms. The

input can be derived from many microprocessor outputs. The typical signals

used are the microprocessors address signals, data signals, or control signals. When the microprocessor

functions normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to

time-out. To guarantee that the watchdog timer does not time out, a high-to-low transition must occur at

or less than the minimum watchdog time-out of 1 second. A typical circuit example is shown in Figure 6.

MICROMONITOR BLOCK DIAGRAM

Figure 1

PUSH-BUTTON RESET

Figure 2

3 of 10

DS1705/DS1706

PUSH-BUTTON RESET CONTROLLED BY

NMI

AND

WDS

Figure 3

TIMING DIAGRAM: PUSHBUTTON RESET

Figure 4

NON-MASKABLE INTERRUPT CIRCUIT EXAMPLE

Figure 5

SENSE

Example:

R1+ R2

X 1.25

MAX

SENSE

X V

SENSE

= 4.50V at the trip point

= 3.3V

10 k = R2

4.50

X 3.3 = 12.4V maximum

1.25

Therefore:

4.5 =

10k

X 1.25

10k

4 of 10

R1 = 26 k

DS1705/DS1706

WATCHDOG TIMER

Figure 6

TIMING DIAGRAM: STROBE INPUT

Figure 7

TIMING DIAGRAM: NON-MASKABLE INTERRUPT

Figure 8

5 of 10

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