SIM Tech SimCom SIM340 Hardware Design page 34

SIM340 Hardware Design
Figure 16: Maxell TC614 Charge Characteristic
Figure 17: Seiko TS621 Charge Characteristic
Note:
Gold-capacitance backup
Some suitable coin cells are the electric double layer capacitors available from Seiko (XC621),
or from Panasonic (EECEM0E204A). They have a small physical size (6.8mm diameter) and a
nominal capacity of 0.2F to 0.3F, giving hours of backup time.
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SIM340_HD_V3.09 18.03.2009