Hi guys,
I have some trouble connecting the bq77908 with the USB-to-GPIO Adapter to my computer (Firmware on Adapter: V2.0.19). Everytime I try to get a connection with the Evaluation or Programming Software an error message shows up and says it can't find the chip. Thereby the CHGST Signal is always correctly at 2V and the Chip is awake, the 14V on the Programming Interface are also available.
Consequently I started to check the outputs of the GPIO-Adapter with an oszilloscope. The PGM and the ZEDE Signals are both low all the time (0.2 - 0.3V) while the SCLK and SDATA are continuously high at 3.5V.
Now the datasheet says that ZEDE must be on VREG to activate the serial communication of the chip. Have I understood right that this signal should come out the GPIO adapter? And if yes, do I need to configure something else or is there maybe something broken in the GPIO adapter?
Have I forgotten or done something else wrong to get a connection to the chip?
I really appreciate your help.