In the electrostatic test with 6kV or 8kV air discharge hit B0 or B15 chip will stop working, MCU reset once again normal.

Hello Gabriel,

Please provide more detail.  What processor IC is used in this design?

Thank you,

~Leonard  

Dear Leonard

The processor is GD M3 series.

The specific process is such: using electrostatic test equipment 8kv air discharge, the unit sampling interface and the NTC sampling interface for air discharge test, the failure of the oil chip, the sampling data abnormal, the communication stops, and the MCU returns to normal when the MCU is reset.

The whole action can be repeated. This is not happening in 4kv. + 6kv and + 8kv will appear.

Thank you Gabriel,

I'm not familiar with GD processor, please provide the complete TI part number.

~Leonard 

Also, to clarify, are you looking for a protection device, or a way for the processor to handle this esd event? 

~Leonard  

Dear Leonard

Sorry ,the part is BQ7694003.

Hi Gabriel,

The common reference for ESD design in battery management circuits is www.ti.com/lit/slua368 While it was prepared for the BQ20zxx family the principles are the same, keep the sensitive electronics from the ESD current. You want to direct the ESD current across the pack terminals, from communication lines to a pack terminal, and from the pack terminals to the cells.  From the cells to the electronics you want any transient current to reach the filter capacitor before reaching the pins.  The ESD performance will be dependent on the layout as well as the schematic.    Also check the frequency response of the capacitors.  Ceramic capacitors will generally have good frequency response.  The BQ76940 generally requires a large Cf filter capacitor value, sometimes those will have poor high frequency response and a small capacitor in parallel may shunt ESD energy better than the larger value.