BQ27542-G1: Question about bq27542

Jimmy Huang

Part Number: BQ27542-G1
Other Parts Discussed in Thread: BQSTUDIO

Hello：

The FG used in our current project is bq27542. Please inquire about the Value of cut-off current of this FG and whether there are relevant setting methods. Please also help provide it,

over 2 years ago

0 Jackson DiGiovanna over 2 years ago

TI__Expert 8245 points

Hi Jimmy,

Can you clarify exactly what you mean by "cut-off current"? This could refer to many different parameters on this device such as taper current, quit current, or dead band current. If you could provide so more detail on this I will be happy to advise you going forward.

Best Regards,

Jackson

0 Jimmy Huang over 2 years ago in reply to Jackson DiGiovanna

Expert 2205 points

Hi Jackson:

"Cut off current" refers to the current when charging is stopped, or I see that the Ti document introduces a "full charge termination detection", which has a condition that averagecurrent() is < taper current. Here's taper current. Please help confirm whether it can be modified and how to modify it. Thank you!

0 Shirish over 2 years ago in reply to Jimmy Huang

TI__Guru 57747 points

Hello Jimmy,

Is this the setting that you are looking for?

0 Jimmy Huang over 2 years ago in reply to Shirish

Expert 2205 points

Hi Shirish：

This should be it. Is there any way to modify the value of taper current in the driver?

0 Shirish over 2 years ago in reply to Jimmy Huang

TI__Guru 57747 points

Hello Jimmy,The driver can send the commands to change data. The commands are detailed in the TRM. We do not recommend changing values after the pack is manufactured. We recommend that all values be set before cells are attached to the pack.

0 Jimmy Huang over 2 years ago in reply to Shirish

Expert 2205 points

Hi Shirish:

What is the factory default value of taper current? Is it 100mA?

0 Shirish over 2 years ago in reply to Jimmy Huang

TI__Guru 57747 points

It is specified in the TRM. If this is from the TRM, then the answer is 100mA.

0 Jimmy Huang over 2 years ago in reply to Shirish

Expert 2205 points

Hi Shirish：

If there is a detailed description in TRM, please help specify it (it's best to take a screenshot to explain it). My customer needs to confirm the initial default value of cut-off current（Taper current）

0 Shirish over 2 years ago in reply to Jimmy Huang

TI__Guru 57747 points

Section 7.5 Full Charge Termination Detection

0 Jimmy Huang over 2 years ago in reply to Shirish

Expert 2205 points

Hi Shirish:

Please help to give the specific method description of modifying the taper current (or point out the specific location in the TRM). We need to do some verification in the early commissioning stage to avoid problems such as unable to fully charge the battery in the later stage, which will affect the product quality

0 Shirish over 2 years ago in reply to Jimmy Huang

TI__Guru 57747 points

Hello Jimmy,

You can use bqStudio to change it using the Data memory tab

Or refer the TRM section 16.2 Data Flash Interface for detailed steps

Power management

Power management forum

BQ27542-G1: Question about bq27542