ZHCSIH0A December 2017 – July 2018 LP87702-Q1
Buck load current can be monitored via I2C registers. The monitored buck converter is selected with the LOAD_CURRENT_BUCK_SELECT bit in SEL_I_LOAD register. A write to this selection register starts a current measurement sequence. The converter is forced to PWM mode during the measurement. The measurement sequence is 50 µs long at maximum. LP87702-Q1 can be configured to give out an I_MEAS_INT interrupt in INT_TOP_1 register after the load current measurement sequence is finished. Load current measurement interrupt can be masked with I_MEAS_MASK bit in TOP_MASK_1 register. The measurement result can be read from I_LOAD_1 and I_LOAD_2 registers. The Buck converter load current measurement result is 9-bit wide, with 8 LSB bits stored in I_LOAD_1 register and 1 MSB bit stored in I_LOAD_2 register. The single bit resolution is 20 mA, with a maximum load current value of 10.22A.