The TMCS1100 is a galvanically isolated Hall-effect current sensorcapable of dc or ac current measurement with high accuracy, excellent linearity, and temperaturestability. A low-drift, temperature-compensated signal chain provides < 1% full-scale error across the devicetemperature range.
The input current flows through an internal 1.8-mΩ conductor that generates a magneticfield measured by an integrated Hall-effect sensor. This structure eliminates externalconcentrators and simplifies design. Low conductor resistance minimizes power loss and thermaldissipation. Inherent galvanic insulation provides a 600-V lifetime working voltage and3-kVRMS basic isolation between the current path and circuitry. Integratedelectrical shielding enables excellent common-mode rejection and transient immunity.
The output voltage is proportional to the input current with four sensitivity options.Fixed sensitivity allows the TMCS1100 to operate from a single 3-V to 5.5-V powersupply, eliminates ratiometry errors, and improves supply noise rejection. The current polarity isconsidered positive when flowing into the positive input pin. The VREF inputpin provides a variable zero-current output voltage, enabling bidirectional or unidirectionalcurrent sensing.
The TMCS1100 draws a maximum supply current of 6 mA, and allsensitivity options are specified over the operating temperature range of –40°C to +125°C.