SP691ACN SIPEX [Sipex Corporation], SP691ACN Datasheet - Page 10

• Manufacturer Part Number: SP691ACN
• Description: Low Power Microprocessor Supervisory with Battery Switch-Over
• Manufacturer: SIPEX [Sipex Corporation]

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.
Figure 17. Typical Application Circuit of the SP691A/693A/800L/800M
Date: 5/25/04
A0-A15
CMOS
RAM
RAM
µP
BUS
to
V
CC
1
n
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2004 Sipex Corporation
RESET
I/O LINE
NMI
V
Address
Decode
CC
0.1µF
Regulated +5V
FEATURES
Backup
Supply
Unregulated DC
BATT ON
R
R
RESET
1
2
CE
GND
PFO
CE
V
V
10
WDI
V
PFI
BATT
OUT
OUT
CC
IN
The SP691A/693A/800L/800M series is a
complete µP supervisor IC and provides the
following main functions:
3) Power Fail Comparator
1) µP reset
2) µP reset
power fluxiations such as power-up,
power-down, and brown out conditions, and
is guaranteed to be in the correct state for
V
the circuit.
optional watchdog timer has not been
toggled within a specified time.
power-fail warning and low-battery
detection, or monitors another power
supply.
CC
down to 1V, even with no battery in
Reset output is asserted during
WDO
LOWLINE
THEORY OF OPERATION
Reset output is pulsed if the
alarm
system
status
indicator
Provides for