Hardware Design - Rainbow Technologies
Hardware Design - Rainbow Technologies
Hardware Design - Rainbow Technologies
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SIM300DZ <strong>Hardware</strong> <strong>Design</strong>Figure 9: RTC supply from capacitor• Li-battery backupRechargeable Lithium coin cells such as the TC614 from Maxell, or the TS621 from Seiko, arealso small in size, but have higher capacity than the double layer capacitors resulting in longerbackup times.Typical charge curves for each cell type are shown in following figures. Note that the rechargeableLithium type coin cells are generally pre-charged from the vendor.Figure 10: Panasonic EECEMOE204A Charge CharacteristicSIM300DZ_HD_V2.03 3210.01.2007
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