Hardware Design - Rainbow Technologies

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SIM300DZ Hardware DesignFigure 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
SIM300DZ Hardware DesignFigure 11: Maxell TC614 Charge CharacteristicFigure 12: Seiko TS621 Charge CharacteristicNote:Gold-capacitance backupSome suitable coin cells are the electric double layer capacitors available from Seiko (XC621),or from Panasonic (EECEM0E204A). They have a small physical size (6.8 mm diameter) and anominal capacity of 0.2 F to 0.3 F, giving hours of backup time.SIM300DZ_HD_V2.03 3310.01.2007
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