bq34z100 20% led never turns off

We should be able to find a configuration where all LEDs are off at 0% SOC. Please send your gg file and I can check it on Monday.

This is my gg file

I also see that when bqstudio shows SOC under 20% the 20% led is on and when SOC becomes 20% then both 20% & 40% led light up.Similar with all other ranges also.I know bq2050 used to show 20% when voltage level was above EDV1 and 20% would blink when EDV1 reaches and 20% turns off when EDVF reached. Can something similar be done with bq34z100 ,since I am trying to replace bq2050 with bq34z100.

Hi Tom,

Did you find any setting to turn off 20% led when 0% SOC is reached?

It looks like the lower LED is always lit. You can connect your LEDs to the second though sixth outputs on the shift register and use the reporting sequence that you want. The LED Configuration register is still set to 43.

Thanks Tom,

I will try this and see if it works.

But if you could have implemented the blinky led near End of discharge it would have been great,it gives a good indication that battery is going to finish.It would be great if you would consider this function to be implemented in future software updates.
It really is very helpful when we use the LED's only to check the SOC.

Hi Tom,

I tried as you said but there is still problems.

Now 20% led is off till SOC is below 20% and lit up when SOC becomes 20% , when battery is discharged 20% led turns off when SOC becomes 19% and similar with all other ranges i.e 100% led will be lit only when SOC is 100% and 100% led will turn off immediately when SOC becomes 99% this is problematic . 100% led should be on till SOC is between 80% to 100% range which happens with the original circuit.

What I want is 20% led should turn off when SOC becomes 0% or some level that could be set and not when SOC becomes less than 20%.

Can you workout a way in which 20% led will turn off when 0% SOC is reached or at some settable level?

Hope you reply fast.

Those are the options for the LED state of charge display on this device. Our other devices offer more flexibility in setting the thresholds and display, but this one is less flexible.

Can you suggest the other devices?

You are using a 4S configuration, so most of our Impedance Track and CEDV gauges should support your cells. You could use the bq40z50 as an IT option or the bq3050 as a CEDV option.

We dont want a complete BMS solution we only want SOC indicator . Are there any such IC's with Impedance track and only SOC indication.

bq34z100 is not a complete BMS solution, just a gauge. Sorry that the LED isn't performing as you expect. Are you sure that you have the number of LED's set correctly. It can be confusing because you set the number of LEDs as N-1.

Yes I am sure I have set the no of LED's correctly its 43 as given in datasheet for 5 LED with I2C communication. Is there any chance that this problem will be rectified in future software updates so I can continue with current chip and update the chip later to solve this problem and is there any chance of new Gas Gauge IC be to be launched within this year?

Yes I want a state where all led's will be off which could be set on some low SOC like below 5% or at some remaining capacity value. Something similar to bq2050 in which on reaching EDV1 value 20% led used to blink which really gives a good indication of end of battery and on reaching EDVF value all led's turned off.

Also are there any new Gas Gauge IC with Impedance Track to be released this year?

We will release new devices this year and some will use IT gauging, but they will be more similar to the bq40z50 than the bq34z100-G1. Does the bq2050 still work okay for your application?

Yes it does but we wanted to remove the learning cycle that each pack has to go through so we switched to bq34z100 but unfortunately its not working for us.