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SP704EP Datasheet(PDF) 11 Page - Sipex Corporation |
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SP704EP Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 16 page SP703/704DS/07 SP703/704 Low Power Microprocessor Supervisory © Copyright 2000 Sipex Corporation 11 L A N G I SS U T A T S V C C V m o r f d e t c e n n o c s i D T U O V T U O V o t d e t c e n n o C T T A B h g u o r h t 8 l a n r e t n i n a Ω h c t i w s S O M P V T T A B V o t d e t c e n n o C T U O t n e r r u C . s i y r e t t a b e h t m o r f n w a r d 6 . 0 n a h t s s e l µ s a g n o l s a , A V C C V < T T A B . V 1 - I F P s i r o t a r a p m o c li a f - r e w o P . d e l b a s i d O F Pw o l c i g o L T E S E Rw o l c i g o L R Md e l b a s i d s i t e s e R l a u n a M 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 T R A P R E B M U N M U M I X A M Y R E T T A B - P U K C A B ] V [ E G A T L O V 3 0 7 P S0 8 . 4 4 0 7 P S5 5 . 4 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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