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SP690A Datasheet(PDF) 11 Page - Sipex Corporation

Part # SP690A
Description  Low Power Microprocessor Supervisory with Battery Switch-Over
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP690A Datasheet(HTML) 11 Page - Sipex Corporation

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Date: 11/29/04
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
© Copyright 2004 Sipex Corporation
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Using a High Capacity Capacitor
as a Backup Power Source
VBATT has the same operating voltage range as
VCC, and the battery-switchover threshold volt-
ages are typically +20mV centered at VBATT,
allowing use of a capacitor and a simple charging
circuit as a backup source (see Figure 16).
If VCC is above the reset threshold and VBATT
is 0.5V above VCC, current flows to VOUT and
VCC from VBATT until the voltage at VBATT is
less than 0.5V above VCC.
Leakage current through the capacitor charging
diode and the SP690A/SP802L/SP805L internal
power diode eventually discharges the capacitor
to VCC. Also, if VCC and VBATT start from 0.5V
above the reset threshold and power is lost at
VCC, the capacitor on VBATT discharges through
VCC until VBATT reaches the reset threshold; the
SP690A/SP802L/SP805L then switches to
battery-backup mode.
Figure 15. Allowable BACKUP-BATTERY Voltages
Figure 14. Input and Output Status in Battery-Backup Mode.
To enter the Battery-Backup mode, V
CC must be less than the
Reset threshold and less than V
BATT.
Figure 16. Backup Power Source Using High Capacity
Capacitor with SP690A/802L/805L and a +5V
±5% Supply
Figure 17. Backup Power Source Using High Capacity
Capacitor with SP692A/802M/805M and a +5V
±10% Supply
VCC
+5V
GND
VBATT
VOUT
RESET
CONNECT TO
STATIC RAM
TO µP
0.1F
CONNECT
(RESET)*
*( ) SP805L only
VCC
+5V
GND
VBATT
VOUT
RESET
CONNECT TO
STATIC RAM
TO µP
100KΩ
0.1F
CONNECT
(RESET)*
*( ) SP805M only
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