8.3.1.5 Buck Converter Load Current Measurement

Buck load current can be monitored via I²C registers. The monitored buck converter is selected with the SEL_I_LOAD.LOAD_CURRENT_BUCK_SELECT[1:0] register bits. A write to this selection register starts a current measurement sequence. The measurement sequence is typically 50 µs long. The LP8758 device can be configured to give out an interrupt INT_TOP.I_LOAD_READY after the load current measurement sequence is finished. Load current measurement interrupt can be masked with TOP_MASK.I_LOAD_READY_MASK bit. The measurement result can be read from registers I_LOAD_1 and I_LOAD_2. Register I_LOAD_1 bits BUCK_LOAD_CURRENT[7:0] give out the LSB bits and register I_LOAD_2 bits BUCK_LOAD_CURRENT[9:8] the MSB bits. The measurement result BUCK_LOAD_CURRENT[9:0] LSB is 20 mA, and maximum value of the measurement is 20.46 A. The measured current is the total value of the master and slave phases.