Simon,

We are checking to see how the help file got dropped from the setup program. You can reference the DF_Help_z90_RevB1.html file located in the bqEVSW documentation directory until we can repair the link.

Regards

Tom

Hi Tom,

Thanks for your prompt reply. Actually I did a fresh clean install using the bq20z75 v1.81 gg software only, so I don't have the DF_Help_z90_RevB1.htm to use.

Can you post the relevant file here for me please?

Regards

Simon

Here is the file.

Hi Tom,

Actually I had a look at that file, and though it is helpful and very much explains whats going on on the gg ev software screens, it does not match the bq20z75 v1.81 software, numerous differences are apparent, for example pf status does not match. I haven't been able to check everything as it is 84 pages long when I copy it to a word file. 

It would be far better if you could get a hold of the correct matching help file for me please, the DF_Help_z70_RevC1.html.

Also I have some more questions, with some background as follows:

1. I have set up the bq20z75evm, and have replaced the bq20z75 part with a v1.80 part as the EVM did not work with the part as supplied .

2. I have managed to calibrate the chip, by gathering various instructions and trying them, but the information is ambiguous. In the end for calibration I did as follows:

2.1 Set up a 1K resistor network and applied a PSU between Pack- and 1N to generate discharge current, and measured

2.2 I measure CC Offset with no current as per p202 of SLUA404

2.3 I measure voltage by applying 12V across the resistors.

The questions I have are as follows:

1. I have viewed the video from youtube: Part 3: Optimizing bq275xx battey fuel guage EVM with bqEASY. This is very useful, but it refers to a Part 2. I cannot find the video anywhere, does it exist and can you let me have a copy or point me to a URL?

2. The GGEV calibrate screen  shows two FET control radio button options, but I cannot find an explantion of when to use these or what they mean, can you explain them please?

3. Also on the GGEV there is a Pack Voltage calibrate option, and CCboard offset calibration. The documentation says these may not be necessarily used. Can you explain what they are for, and when they are supposed to be used please?

4. The documentation says to calibrate using resistors as calibrating with batteries attached is more complex. Does this mean that one has to have the ability to plug resistors in first for calibration, and then swap to a battery on the fly to complete the bqEasy Learning Cycle process?

5. The Cycle process instructs to charge the pack to full. There does not seem to be any information regarding the charger in this process. Is it expected that one of the charger chips, for example a bq24247 is set up on an SMB bus, so that the bq20Z75 can control it for a full charge cycle, or does one just set up a bench supply and giver it a current limit for a period of time. Is the equipment necessary to perform the charge process and the actual charge process noted anywhere in the documentation as I could not find detail. Can you please tell me what I am supposed to do here?

Thats about it for now.

Thanks in advance

Regards

Simon Buchwald 

Simon,

I have a suggestion for the help file - Installing the bq20z70 bqEVSW in addition to what you already have will install the help file that bqEVSW is looking for. The bq20z70 and bq20z75 are almost identical.