Shunt monitors detect vehicle currents

ZXCT18xQ automotive current shunt monitors from Diodes measure small sense voltages across common-mode voltages up to 26 V. Operating from a 2.7-V to 5.5-V supply, these AEC-Q100 qualified instrumentation amplifiers are suited for vehicle lighting controls, high-side and low-side current sensing, battery management, fault current detection, and other vehicle body control systems.

The ZXCT180Q and ZXCT181Q support unidirectional and bidirectional current sensing, respectively. The ZXCT180Q features two pin assignment options, with its OUT pin placed in different configurations. Its REF pin is tied to GND. For bidirectional current sensing, as required in battery management systems, the ZXCT181Q introduces a voltage to the REF pin, offsetting the output voltage.

Both the ZXCT180Q and ZXCT181Q offer fixed gains of 20 V/V, 50 V/V, 100 V/V, and 200 V/V. They measure shunt voltages at common-mode voltages from -0.3 V to 26 V, independent of the supply, with a 370-µA maximum supply current. The devices support bandwidths up to 400 kHz at 20 V/V and slew rates of 2 V/µs.

The ZXCT180Q is priced at $0.11 each, while the ZXCT181Q is priced at $0.12 each, both in 1,000-piece quantities.

ZXCT180Q product page 

ZXCT181Q product page 

Diodes

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