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SP805LEN Datasheet(PDF) 11 Page - Sipex Corporation |
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SP805LEN Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 16 page SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over © 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 T E S E R) y l n o 5 0 8 P S ( h g i h c i g o L I D Wd e l b a s i d s i r e m i t g o d h c t a W 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 100K Ω 0.1F CONNECT (RESET)* *( ) SP805M only T R A P R E B M U NR E B M U N R E B M U N R E B M U NR E B M U N M U M I X A M Y R E T T A B - P U K C A BY R E T T A B - P U K C A B Y R E T T A B - P U K C A B Y R E T T A B - P U K C A BY R E T T A B - P U K C A B ] V [ E G A T L O V] V [ E G A T L O V ] V [ E G A T L O V ] V [ E G A T L O V] V [ E G A T L O V A 0 9 6 P S L 2 0 8 P S L 5 0 8 P S 0 8 . 4 A 2 9 6 P S M 2 0 8 P S M 5 0 8 P S 5 5 . 4 |
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