Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails

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 +3.3 V 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 +3.3 V 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. The accuracy of the measurement is primarily determined by resistor tolerances and the accuracy of the band gap reference, and is typically better than 1.

ADUM5402屬于隔離器 > 數(shù)字隔離器。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的ADUM5402數(shù)字隔離器數(shù)字隔離器用于在電氣上隔離電路，但仍允許電路之間傳輸數(shù)字信號。技術(shù)類型包括容性耦合式、巨磁阻 (GMR) 式或磁耦合式。??通道數(shù)范圍為 1 至 10 個，通道類型可以是雙向、單向或二者組合。