Ask questions about BQ25703A no charge.
We use the RK3399 platform, the TypeC interface is powered, and the charging IC uses the BQ25703A. In the use of the product, it is found that the machine is not charged. The analysis found that the battery is not charged, the battery voltage is 0V, and the battery interface is inserted into the battery. Found that the battery 0V protection contact, can be charged. However, there is a recurrence of non-charging phenomenon. Therefore, it is found that the 10R (using 0402, 1/16W) resistors connected in series between the peripheral SRN and the battery of the BQ25703A have a burnout phenomenon, and there is about 600R after the burnout. See the schematic below.
Check the specification to find that the SRNSRP pin is for battery detection and is related to the charge and discharge current. If you want to consult, what kind of resistance will burn out under this condition? How much current is there on this circuit? What is the working principle of SRN and SRP? .
In addition, have you 
encountered similar problems without charging, but also hope to learn from the experience, hope to reply, thank you.
