The TMCS1100 is a galvanically isolated Hall-effect current sensor
capable of dc or ac current measurement with high accuracy, excellent linearity, and temperature
stability. A low-drift, temperature-compensated signal chain provides < 1% full-scale error across the entire
device temperature range.
The input current flows through an internal 1.8-mΩ conductor that generates a magnetic
field measured by an integrated Hall-effect sensor. This structure eliminates external
concentrators and simplifies PCB design. Low conductor resistance minimizes power loss and thermal
dissipation. Inherent galvanic insulation provides a 600-V basic working isolation and 3-kV
dielectric withstand isolation between the current path and circuitry. Integrated electrical
shielding enables excellent common-mode rejection and transient immunity protection.
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 power
supply, eliminates ratiometry errors, and improves supply noise rejection. The current polarity is
considered positive when flowing into the positive input pin. The VREF input
pin provides a variable zero-current output voltage, enabling bidirectional or unidirectional
The TMCS1100 draws a maximum supply current of 5 mA, and all
sensitivity options are specified over the operating temperature range of –40°C to +125°C.