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GSM/GPRS module from the manufacturer SIMCom

5
votes
Well, that's the recommended circuit. Keep in mind that at the 2uA current draw of the RTC backup, even a 1N4148 will have only about 0.3V drop and it will work down to Vrtc = 2V. A CR2032 lithium p …
answered Jan 11 '16 by Spehro Pefhany