The TX_CTRL signal is a 2.8V signal for TX Burst indication .
Refer to the following table for the status of the TX_CTRL signal depending on the embedded module state
During TX burst, there will be higher current drain from the VBATT power supply which causes a voltage drop. This voltage drop from VBATT is a good indication of a high current drain situation during TX burst. The blinking frequency is about 216Hz. The output logic high duration, T duration, depends on the number of TX slots and is computed as follows