I am working on marrying a Raspberry Pi Zero and a MC7700 to provide GPS time corrections, send /receive SMS. I realize the MC7700 is an older product but it’s readily available and inexpensive. If I get my prototype hydroponic/aquaculture control system working with AT commands, I can step up to a current product in the future.
My issue is the MC7700’s 5 VDC power requirement. My 5 VDC supply is provided by a battery backup circuit with a maximum current rating of 1.1 A. The following table is from the MC7700 Product Technical Specification.
The title states the values shown are “averaged” current requirements and the LTE value is 1100 mA, my entire power budget, leaving nothing for the Raspberry Pi Zero. If I limit operation to HSUPA, how much headroom do I need above the 800 mA average current from the table? Will I have 150 mA left to run the Raspberry Pi Zero?