Dear TI Wireless Power Application Support Team,
Currently we have a wireless single-cell Lithium battery charger system based on a BQ51013BRHLT device.
Our TX and RX coils are well tuned, and our charger performance is quite good.
We use the RECT output as a means to alert the host microcontroller that the device is on the charger, and we disable most of the system.
Our problem is when BQ51013BRHLT is put in powerdown mode. We use battery charger’s “battery full” signal to power down BQ51013BRHLT by pulling <EN2,EN1>=”11” to stop the charging current from the receiver.
However, when the BQ51013BRHLT is left on charger, disabled, we noticed that we still see transient OOK type modulated waveforms on the RECT out - I believe this is due to routine data from the TX coil ?
These pulses mess up our firmwire, signalling that the charger is re-applied.
My two questions are:
1) Is there a way to stop RECT toggling while on the charger and device is turned off ? is this something expected ?
2) Is there any other output pin (other than RECT) from the device that we can use to detect that the device is on the charger when it is on, that is more robust ?
Thanks for your help!
Regards,
Bertan