IMP802 IMP Inc, IMP802 Datasheet

IMP802

Manufacturer Part Number

IMP802

Description

P POWER SUPPLY SUPERVISOR WITH BATTERY BACKUP SWITCH

Manufacturer

IMP Inc

Datasheet

1.IMP802.pdf (10 pages)

Current page: 1 of 10
Download datasheet (226Kb)

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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 IMP802

IMP802 Summary of contents

Page 1

... 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. Block Diagrams ...

Page 2

... Reset Threshold (V) IMP690A 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) ...

Page 3

... RESET (or RESET) pulses low for the reset pulse width typically 200ms. It will remain low below the reset threshold (4.65V in the IMP690A/IMP802L and 4.4V in the IMP692A/IMP802L) and remains low for 200ms after V the reset threshold. RESET Active-HIGH reset output. The inverse of RESET. ...

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 (Note 1) Supply Current Excluding I I OUT Battery-Backup Mode SUPPLY (Excluding I ) OUT V Standby Current BATT (Note 2) V Output ...

Page 5

... The reset pulse width typically around 200ms and is LOW for the RS IMP690A, IMP692A, IMP802 and HIGH for the IMP805L. Power-up reset occurs when a rising V CC old forcing a reset condition in which the reset output is ...

Page 6

... CC V > BATT V < Reset Threshold and Closed CC V < BATT IMP690A / IMP802L /IMP805L Reset Threshold = 4.65V IMP692A /IMP802M Reset Threshold = 4.4V Figure 4. Internal device configuration of battery switch-over function 6 IMP690A , 692A IMP690A , 692A Table 1. Pin Connections in Battery Backup Mode Pin Connection V Connected to V ...

Page 7

... To Static RAM To P Figure 7. Simple Voltage divider sets PFI trip point 690A_08.eps CC , 802L, 802M, 805L , 802L, 802M, 805L Application Information should be connected to OUT + IMP690A R 1 IMP692A PFI PFO IMP802L IMP802M IMP805L R 2 GND ...

Page 8

... PFO V H TRIP V IN Figure 9. Using PFI to monitor negative supply voltage 690A_10.eps , 802L, 802M, 805L , 802L, 802M, 805L + IMP690A R 1 IMP692A IMP802L PFI PFO IMP802M IMP805L R 2 GND V– V – TRIP + TRIP 0V V– TRIP R ...

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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