Hi Louis,
I think you would need to have a second sense resistor between cells 15 and 16 for the top device.
However, I think this design might become very complicated in operation. I do not think anyone has tried to stack two BQ78350 gauges like…
Hi Khánh,
Are you referencing TIDA-01093 for your design? A couple things I notice in the schematic:
The filter capacitors on BAT and VC5X are only 1uF and 10uF is recommended.
The diode from VC10 to BAT and from VC5 to VC5X.is showing as a Schottkey…
Hi Ansul,
For 30s configuration 2 BQ76940s would need to be stacked similar to TIDA-01093. The BQ76940 has an abs max limit of 36V per 5 cell group, see the data sheet. In a 30s configuration each BQ76940 would have only 15 cells attached with a voltage…
Part Number: BQ76940 Other Parts Discussed in Thread: BQ78350-R1 , BQ76930 Hello
I need Reference Design for 20S Battery Cell .
I found a Reference Design using msp430.
http://www.ti.com/tool/TIDA-01093
But i using a BQ78350-R1.
Do you Provide…
Hello Vasanth,
The BQ769142 does not have a built-in stackable interface, hence why additional circuitry is required in order to stack it. The IC alone does not support stacking. We are planning in releasing a reference design of a stacked device using…
Other Parts Discussed in Thread: TIDA-010030 , BQ34Z100-G1 , BQ76930 , TIDA-01093 , BQ76952 , BQ76940 , BQ78350-R1A , BQ40Z80 , BQSTUDIO , BQ78350 1. Do TI have similiar device with higher cell count like bq20z95 (need upto 16 cells), device should have…
Hi Lian,
I do not see anything in the schematic that would explain this behavior. It looks like your system is based on this reference design:
http://www.ti.com/tool/TIDA-01093?
Does the issue happen during cell connection or after the battery has…
Hi Kevin,
Your image is not showing for some reason. When stacking more than one BQ76942, we recommend using low side FETs. This video from the 2020 BMS Deep Dive goes through an example stacking with the BQ769x2 family (start around the 20:00 mark…
Hi Ansul,
Unfortunately that is not possible. The firmware for the BQ78350-R1 is designed to interact with only one AFE.
However, this is possible with a microcontroller since you have control over the firmware. Here is an example TI Reference Design…
