imp802mesa A1 PROs co., Ltd., imp802mesa Datasheet

imp802mesa

Manufacturer Part Number

imp802mesa

Description

?p Power Supply Supervisor With Battery Backup Switch

Manufacturer

A1 PROs co., Ltd.

Datasheet

1.IMP802MESA.pdf (10 pages)

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The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L simplify power

supply monitoring and control in microprocessor systems. Each circuit

implements four functions: Reset control, watchdog monitoring, battery-

backup switching and power-failure monitoring. In addition to

microprocessor reset under powerup and power-down conditions, these

devices provide battery-backup switching to maintain control in power-

loss and brown-out situations. Additional monitoring capabilities

can provide an early warning of unregulated power-supply loss before

the voltage regulator drops out. The important features of these four

functions are:

While these features are pin–compatible with the industry standard

power–supply supervisors offered by Maxim, the IMP devices are supe-

rior replacements and can reduce power requirements by 70 percent

when compared to Maxim MAX690/MAX692A/MAX802L/MAX802M/

MAX805L devices. Short-circuit and thermal protection have also

been added.

The IMP690A/IMP802L/IMP805L generate a reset pulse when the

supply voltage drops below 4.65V, and the IMP692A/IMP802M

generate a reset below 4.40V. The IMP802L/IMP802M have power–fail

accuracy to ±2%. The IMP805L is the same as the IMP690A except that

RESET is provided instead of RESET.

IMP, Inc.

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b) 4.40V or 4.65V V

d) 1.25V threshold detector for power loss or general purpose voltage

Block Diagrams

P P

OWER

1.6 second watchdog timer to keep microprocessor responsive

and power-down

SPDT (single-pole, double-throw) PMOS switch connects backup

power to RAM if V

monitoring

h Batt

WDI

BATT

PFI

( ) IMP805L

ANAGEMENT

IMP690A, IMP692A, IMP802L, IMP802M,

er Suppl

Battery-Switchover

threshold for microprocessor reset at power-up

1.25V

y Bac

3.5V

fails

Circuit

IMP690A

0.8V

IMP805L

IMP690A

GND

y Super

kup Switc

1.25V

Generator

Watchdog

Reset

Timer

690A_03.eps

RESET

(RESET)

PFO

OUT

visor

San Jose, CA

, 692A

Design improvement over Maxim

MAX690A/692A/802L/802M/805L

— 70% lower current than Maxim:

— RESET Operation to 1.1V

Two precision supply-voltage monitor options

— 4.65V (IMP690A/802L/805L)

— 4.40V (IMP692A/802M)

Battery-backup power switch on-chip

Watchdog timer: 1.6 second timeout

Power failure/low battery detection

Short-circuit protection and thermal limiting

Small 8-pin SO package

No external components

Specified over full temperature range

Embedded control systems

Battery–operated systems

Intelligent instruments

Wireless communication systems

PDAs and handheld equipment

, 802L/M, 805L

P/ C power supply monitoring

, 802L/M, 805L

Unregulated DC

100 A maximum

–

3.6V

Lithium

Battery

0.1 F

IMP690A

PFI

GND

BATT

RESET

Typical Application

Key Features

Applications

Regulated +5V

408-432-9100/www.impweb.com

PFO

WDI

OUT

RESET

NMI

I/O LINE

GND

CMOS

RAM

GND

690A_01.eps

Related parts for imp802mesa

imp802mesa Summary of contents

Page 1

IMP690A IMP690A P M OWER ANAGEMENT µ Suppl y Super µ Suppl y Super wit h Batt er y Bac kup Switc wit h Batt er y Bac The IMP690A/IMP692A/IMP802L/IMP802M/IMP805L ...

... IMP690ACPA IMP690ACSA IMP690AC/D IMP690AEPA IMP690AESA IMP690AMJA IMP692A IMP692ACPA IMP692ACSA IMP692AC/D IMP692AEPA IMP692AESA IMP692AMJA IMP802L IMP802LCPA IMP802LCSA IMP802LEPA IMP802LESA IMP802M IMP802MCPA IMP802MCSA IMP802MEPA IMP802MESA IMP805L IMP805LCPA IMP805LCSA IMP805LC/D IMP805LEPA IMP805LESA IMP805LMJA 2 IMP690A , 692A IMP690A , 692A 8 V BATT 7 RESET (RESET) 6 WDI 5 PFO 690A_02.eps Temperature Range 4 ...

Page 3

Pin Number IMP690A/IMP692A IMP802L/IMP802M IMP805L –––– –––– Pin Terminal Voltage with Respect to Ground ...

Page 4

Electrical Characteristics Unless otherwise noted V = 4.75V to 5.5V for the IMP690A/IMP802L/IMP805L and 2.8V; and BATT A MIN MAX Parameter Symbol Conditions Voltage Range CC BATT ...

Page 5

Reset Output It is important to initialize a microprocessor to a known state in response to specific events that could create code execution errors and “lock-up”. The reset output of these supervisory circuits send a reset pulse to the microprocessor ...

Page 6

Application Information Watchdog Input As discussed in the Reset section, the Watchdog Input is used to monitor microprocessor activity. It can be used to insure that the microprocessor continually responsive state by requiring that the WDI pin ...

Page 7

Backup Power Sources - SuperCap Capacitor storage, with very high values of capacitance, can be used as a back-up power source instead of batteries. SuperCap are capacitors with capacities in the fractional farad range. A 0.1 TM farad SuperCap would ...

Page 8

Application Information Power Fail Hysteresis A noise margin can be added to the simple monitoring circuit of Figure 7 by adding positive feedback from the PFO pin. The cir- cuit of Figure 8 adds this positive “latching” effect by means ...

Page 9

Plastic DIP (8-Pin – Plastic DIP (8-Pin)a.eps CerDIP (8-Pin – Ceramic DIP (8-Pin)a.eps ...

Page 10

IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Tel: 800-438-3722 Fax: 408-434-0335 Fax-on-Demand: 1-800-249-1614 (USA) Fax-on-Demand: 1-303-575-6156 (International) e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company ...

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