SP693ACP(2004) データシートの表示（PDF） - Signal Processing Technologies

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SP693ACP
(Rev.:2004)

Low Power Microprocessor Supervisory with Battery Switch-Over

Signal Processing Technologies 

Unregulated DC

R1

Regulated +5V

PFI

R2

VCC

VCC

µP RESET

NMI

RESET

PFO

A0-A15 I/O LINE

WDI

Backup VBATT

Supply

Address

BUS

Decode

BATT ON

CMOS

RAM1

to

VCC

RAMn

0.1µF

CEIN

VOUT

CEOUT

GND

WDO

alarm

LOWLINE

system

status

indicator

Figure 17. Typical Application Circuit of the SP691A/693A/800L/800M

FEATURES

The SP691A/693A/800L/800M devices are

microprocessor (µP) supervisory circuits that

monitor the power supplied to digital circuits

such as microprocessors, microcontrollers, or

memory. The SP691A/693A/800L/800M series

is an ideal solution for portable, battery-

powered equipment that require power supply

monitoring. The SP691A/693A/800L/800M

watchdog functions will continuously oversee

the operational status of a system. Implementing

the SP691A/693A/800L/800M series will

reduce the number of components and overall

complexity in a design that requires power

supply monitoring circuitry. The operational

features and benefits of this series are described

in more detail below.

THEORY OF OPERATION

The SP691A/693A/800L/800M series is a

complete µP supervisor IC and provides the

following main functions:

1) µP reset ➡ Reset output is asserted during

power fluxiations such as power-up,

power-down, and brown out conditions, and

is guaranteed to be in the correct state for

VCC down to 1V, even with no battery in

the circuit.

2) µP reset ➡ Reset output is pulsed if the

optional watchdog timer has not been

toggled within a specified time.

3) Power Fail Comparator ➡ Provides for

power-fail warning and low-battery

detection, or monitors another power

supply.

Date: 5/25/04

SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2004 Sipex Corporation

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