BQ27441-G1: Connection of BQ27441 fuel gauge sensor along with the BQ24075 LiPo Charger

Markovicz

Part Number: BQ27441-G1
Other Parts Discussed in Thread: BQ24075, BQ27411-G1

Dear TI-Team,

I would like to use a BQ27441 fuel gauge sensor for a LiPo battery and a BQ24075 for charging.

I am wondering where to connect the SRN-Pin of the BQ27441. In the datasheet, it reads, the pin should be connected to VSYS. Intuitively, I would put it to my 3.3V VCC rail.

Also, could you please have a quick check if the connections from the LiPo battery to the fuel gauge and the charger circuit are correct?

I've inserted screenshots of the components at the end of this thread.

Thank you for your help!

over 4 years ago

0 Andy Liu (BMS) over 4 years ago

TI__Guru 52115 points

I will take a look at the schematic and then get back to you.

Andy

0 Andy Liu (BMS) over 4 years ago in reply to Andy Liu (BMS)

TI__Guru 52115 points

See my comments below.

a) As we mentioned in the bq27411-g1 datasheet, the BIN pin must not be shorted directly to VCC or VSS and any pullup resistor on the BIN pin must be connected only to VDD and not an external voltage rail.

b) Both BAT and SRP should connect to the positive battery terminal.

c) The BAT pin of BQ24075 should connect to SRN.

See the schematic for your reference.

Here is where I find that schematic.

https://www.sparkfun.com/products/13777

Andy

Power management

Power management forum

BQ27441-G1: Connection of BQ27441 fuel gauge sensor along with the BQ24075 LiPo Charger