UM982eb User Manual
10 Antenna circuit UC-08-M31 EN R1.0
V_BCKP.
The backup battery may run out of power if it is not used for a long time, so it is
recommended to charge the evaluation board for more than two hours when you
first use it.
4 Antenna circuit
4.1 Antenna Short Protection Circuit
The antenna short protection circuit consists of a load management chip and peripheral
circuits.
The 5 V power source supplies the antenna after passing through the load management
chip.
When the current of the antenna circuit is greater than 100 mA, it will trigger short circuit
protection, and FLAGB will output low level signals.
Removing R88/R77 (or R7/R6) and soldering R79 (or R8), you can feed ANT1 (or ANT2)
bypassing the short protection circuit.
To Next Page
Loading...