A gas gauge circuit has a power supply pin, a power return pin, power on {HEAD ~ reset capability}, and {TAIL ~ a communications signal pin} 
A gas gauge circuit has a power supply pin , a power return pin , power on { HEAD ~ reset capability } , and { TAIL ~ a communications signal pin }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL