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Custom PCB with bq51013

Robert Chavez
Prodigy 10 points
Other Parts Discussed in Thread: BQ5101

My problem is quite brief but I haven't been able to figure it out. I am replicating the circuit (though not fully) of the bq51013evm-725 on a custom PCB, I did not however include the R3 temperature resistor and instead used a 20 kOhm resistor in between vtsb and ts/ctrl and a 10 kOhm between ts/ctrl and ground as described by bq5101 data sheet. Any time we place the coil on the transmitter (bq500210evm-689) (same coil used in the receiver eval board ) the status LED flashes red. Based on what the transmitter is doing and what the data sheet describes my assumption is that the transmitter is either sensing a thermal problem or possibly that the receiver is not giving the okay to charge the battery. It seems like there are two functionalities for the ts/ctrl pin, is there a possibility I am doing the wrong one?

Thanks,

Robert Chavez

  • 0
    TI__Mastermind 32400 points

    Hi Robert,

     The described TS resistor set up should disable the TS function of the IC receiver. What I understand from your description is that the IC works fine if the coil of the TX is not changed. Is that right? What is happening at the output of the Rx?

     Thanks!

    Tahar