SP704EP datasheet(11/16 Pages) SIPEX

Part #	SP704EP

Description	Low Power Microprocessor Supervisory with Battery Switch-Over

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Manufacturer	SIPEX [Sipex Corporation]

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SP703/704DS/07

SP703/704 Low Power Microprocessor Supervisory

11

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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 charg-

ing circuit as a backup source (see Figure 12).

If VCC is above the reset threshold and VBATT

is 0.5V above VCC, current flows to V

OUT 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 SP703/704 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 SP703/704 then switches to

battery-backup mode.

Figure 11. Allowable BACKUP-BATTERY Voltages

Figure 10. 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 12. Backup Power Source Using High Capacity

Capacitor with SP703 and a +5V

±5% Supply

Figure 13. Backup Power Source Using High Capacity

Capacitor with SP704 and a +5V

±10% Supply

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VCC

+5V

GND

VBATT

VOUT

RESET

CONNECT TO

STATIC RAM

TO

µP

0.1F

CONNECT

SP703

VCC

+5V

GND

VBATT

VOUT

RESET

CONNECT TO

STATIC RAM

TO

µP

100K

Ω

0.1F

CONNECT

SP704

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SP704EP Datasheet(PDF) 11 Page - Sipex Corporation

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