DS1306_05 Datasheet, PDF (10/21 Pages) Dallas Semiconductor – Serial Alarm Real-Time Clock

Figure 4. POWER SUPPLY CONFIGURATIONS
DS1306
CONFIGURATION 1: BACKUP SUPPLY IS
NONRECHARGEABLE LITHIUM BATTERY
NOTE: DEVICE IS WRITE-PROTECTED IF VCC < VCCTP.
CONFIGURATION 2: BACKUP SUPPLY IS A
RECHARGEABLE BATTERY OR SUPER
CAPACITOR
NOTE: DEVICE DOES NOT PROVIDE AUTOMATIC WRITE PROTECTION.
CONFIGURATION 3: BATTERY OPERATE
MODE
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