Hello TI Team,
Working with the BQ35100 for battery health monitoring in an embedded device. Using Accumulator Mode (ACC), the battery gauge tracks discharge current throughout modes of operation. For the most part, the device is in sleep mode and no routines are executed. At a pre-determined time, the device awakes and transmits a payload of statistics (12.8mA) and then returns to its dormant state (150uA). The device is fitted with a non-replaceable battery, therefore, power consumption is a major issue in terms of longevity.
My understanding is the GE pin must be HIGH and GAUGE_START command must be sent to count coulombs. As per D/S, Section 6.5 these conditions result in 130uA current draw (confirmed using Joulescope to measure current). As per the D/S, Section 7.3.2.1 states the device is only able to update voltage, temperature, and current every 1sec if these conditions are true.
After conducting experiments, the 130uA discharge current when actively counting coulombs is an excessive amount of power consumption when the device sleeps >= 23 hours per day. So, the solution is to only count coulombs when the MCU is awake and performing routines such as transmit/receive. As per the D/S, Section 1 Cover Page and Section 6.3 states the average current consumption is approximately 0.3uA every 30 minutes. Is there a way to continuously count coulombs at 0.03uA? If so, please elaborate how such a low power consumption is achieved.
Also, what is meant by updates every 30 minutes? I assume this means GE = HIGH and GAUGE_START is NOT sent. Please elaborate on the test conditions necessary for the accumulator to update only once every 30 minutes.
Feel free to offer any advice or suggestions it would be greatly appreciated.
Best Regards,
Tim
