Part Number:BQ24773EVM-540
I'm setting up a BQ24773EVM-540 as indicated in its datasheet. The charger power supply is at 19.5V, I2C power supply is at 3.3V and the I2C wires are connected properly to port2 of EV2400. Also, TP11 port on the BQ24773 EVM is connected to ground for 1 cell. However, I'm getting incorrect readings of voltage for the checks which are mentioned in the datasheet. Following are the readings:
| Measurement between | Expected Value | Actual Value |
| TP11 and GND | <0.3V | <0.3V |
| TP7 and GND | 2.6V | -0.452V |
| D5 LED | LIT | LIT |
| TP15 and GND | 5.5V | -0.024V |
| BAT and GND | 1V(+-1.1V) | -0.27V |
| SYS and GND | 4.4V | -0.344V |
I checked the power supply voltages on EVM terminals with a DMM, and they are what I had set them to earlier as specified in the datasheet.
Also, upon running BQstudio and trying to read registers, it is showing a 'Device ACK error'. I had done this process yesterday, but it had given me all the correct voltages and 'Device ACK OK' status on BQstudio. What might be the problem now?
Eventually, I'll be using this EVM and read its registers using LabVIEW with a NI USB-8451, which is an I2C interface. I tried using that interface instead of the EV2400 and I'm getting a similar error of 'device acknowledgement failed' in LabVIEW.