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a few proto GW11's have been made - to test all the elements
AD8553 should replace the AD623 for rail-rail output
Vref - need to install Vref chip?
Measurements of sleep/wake current use
conclusion: Some main changes on final PCB
i) add a switch to control the battery and external power supply, and two diodes
ii) add battery monitor unit
iii) add one voltage reference chip in case the sensor needs high precision supply
iv) change the signal pinout of CON to radio modem
v) change the package of TPS76850 from D to PWP!