EVAL-CN0188-SDPZ

EVAL-CN0188-SDPZ is a CN0188 circuit evaluation board. The circuit monitors current in individual channels of −48V to better than 1% accuracy. The load current passes through a shunt resistor, which is external to the circuit. The shunt resistor value is chosen so that the shunt voltage is approximately 50mV at maximum load current. The measurement result from the AD7171 is provided as a digital code utilizing a simple 2-wire, SPI-compatible serial interface. The entire circuit operates on a single +3.3V supply. Optional galvanic isolation is provided by the ADuM5402 quad channel isolator. In addition to isolating the output data, the ADuM5402 digital isolator can also supply isolated +3.3V for the circuit. The ADuM5402 is not required for normal circuit operation unless galvanic isolation is needed. This combination of parts provides a accurate high voltage negative rail current sense solution with a small component count, low cost, and low power.

• Evaluation board connects to SDP-B controller board (EVAL-SDP-CB1Z) through 120-pin connector