Dear All,
I am implementing a BMS design for an electric Vehicle using the BQ34Z100 IC and I have a few questions after reading the datasheet.
I understand that some of the reported values are scalled to meet some norms and therefore the limit to 65V.
On my implementation I will be using a 440V battery, so would like to know if I am OK by using the right voltage dividers and with the values being compensated by the host (900mV is reported as 65535, which on my case I would scale to 500V instead of 65).
The IC itself is powered by an isolated DC-DC converter, sharing GND with the HV side, for current measurements and runs from an isolated interface, so electrically we should be fine.
lastly, at system power down, the IC is powered by a backup battery, however the HV pack is physically disconnected so there would be no current or voltage readings. The datasheet mentions that even on deep sleep the IC does make a few calculations, so would this affect my readings at all, or since there is no current consumption the IC wont "wake up" periodically?
Lastly, while I wait for the EV2300, I would like to set the RSense (CC Gain and CC Delta parameters) using the I2C interface. Is this possible? The datasheet mentions these should be changed in the Flash calibration section using the EV2300 module and software.
Many Thanks in advance.
Regards