• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 233 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76952: Schematic check request

Statham Su
Genius 4990 points
Part Number: BQ76952

Hello Sir:

We have schematic check request.

Please refer below file.

Looking forward your recommendations.

Thanks a lot.

7875.pdf

  • 0
    TI__Expert 8526 points

    Hi Statham,

    For the most part, your schematic looks okay, but I noticed a few issues:

    • The capacitors on TS1 and TS3 are too large.  Page 65 on the BQ76952 datasheet has more information. 
      • When using the 18 kΩ pullup resistor with the thermistor, the time constant will generally be less than (18 kΩ) × C, so a capacitor less than 4 nF is recommended. When using the 180-kΩ pullup resistor, the capacitor should be less than 400 pF.        
    • The REGIN cap should be 22nF.  Table 7.11 in the datasheet has more information.
    • R10 and C8 on the alert pin are not needed.  This protocol was used for the BQ769x0 devices, but it is unnecessary for the BQ769x2 family.
    • Using a 1uF capacitor on REG1 may be better for startup, but it may not be an issue.  One other customer has seen something strange with 10uF.

    Datasheet link here: BQ76952 3-Series to 16-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li-Polymer, and LiFePO4 Battery Packs datasheet (Rev. B) (ti.com)

    Best,

    Andria