Other Parts Discussed in Thread: USB2ANY
Hello,
I have purchased the USB2ANY and the BQ79656EVM Evaluation Board and was able to get successful communication and reading of voltages. However, I am attempting to connect my BQ79652 board I have purchased (wired up by schematic shown below) to communicate with the USB2ANY using the TX, RX, NFAULT, and GND lines shown on the USB2ANY datasheet with no luck. The intent is to verify functionality with the board using the USB2ANY microcontroller as the communication base to talk to a single BMS board (COM lines connected with 1K Resistor between lines, TX, RX, NFAULT tied to CVSS with 100K Pullup Resistor). I have the following questions:
My design includes all recommended passive/IC components within recommended value ranges, but there is no digital isolation filter chip between the BQ79652 and the USB2ANY. I verified 5V logic high on the TX, RX, and NFAULT lines, but the digital isolator included on the Evaluation board seems to be outputting 3.3V. The USB2ANY datasheet mentions it can operate on 3.3V or 5V, but is that only for power output? Can it read 5V signals for TX/RX? Is the digital isolation filter chip required for communication?
What would be a verification on the board side that the board is in standby/active mode, aside from verifying the voltage at the output pins? I am not reading any TX commands from the BMS board after verifying RX signals for wake and auto-addressing. In this scenario, will the BQ79652 board send any receipt confirmation after receiving the wake or auto addressing commands?
Please let me know of any troubleshooting steps I can take to verify board functionality, we plan to use several of these boards for a BMS project but I would need to have verification of proper implementation by the end of this month.
