The CUR 3105 is a current transducer based on the Hall effect. The IC can be used for very precise current measurements. The output voltage is proportional to the measured current and the supply voltage (ratiometric analog output). Major characteristics, such as magnetic field range, sensitivity, output quiescent voltage (output voltage at B=0 mT), and output voltage range are programmable and are stored in the internal EEPROM. It is possible to program different transducers which are in parallel to the same supply voltage individually. The CUR 3105 features a temperature-compensated Hall plate with choppered offset compensation, an A/D converter, digital signal processing, a D/A converter with output driver, an EEPROM memory with redundancy and lock function for the calibration data, an EEPROM for customer serial number, a serial programming interface, and protection devices at all pins. The internal digital signal processing is of great benefit because analog offsets, temperature shifts, and mechanical stress do not degrade the transducers accuracy. The CUR 3105 is programmable by modulating the supply voltage. No additional programming pin is needed. The easy programmability allows a 2-point calibration by adjusting the output voltage directly to the input signal (current). Individual adjustment of each transducer during the customer’s manufacturing process is possible. With this calibration procedure, the tolerances of the IC and the mechanical positioning can be compensated in the final assembly. The calculation of the individual IC characteristics and the programming of the EEPROM memory can easily be done with a PC and the application kit from Micronas. The transducer is designed for industrial, white goods and automotive applications and operates with typically 5 V supply voltage in the wide junction temperature range from −40 °C up to 170 °C. The CUR 3105 is available in the very small leaded package TO92UT and the SMD package SOIC8. |
