With the aim to contribute to the future of high-voltage systems of hybrid and electric vehicles (xEV), TDK Corporation has released a new hall-effect sensor, CUR 4000. This device with Cursens technology offers non-intrusive, galvanic isolated contactless current sensing and highly accurate current measurements in automotive and industrial applications.
The ISO 26262 ASIL-B ready and AEC-Q100 qualified CUR 4000 sensor is suitable to be used for DC and AC measurements and overcurrent detection in high-power battery monitoring applications and can measure dynamic current ranges up to ≥2000 A. In the linear modes of CUR 4000, a configurable array of Hall elements enables highly accurate measurements for core-based stray-field robust sensor-module designs. While on the other hand, the differential mode of the sensor enables minimal coreless and stray-field robust system designs without shields.
The read-out of the complete Hall array provides an output-offset temperature-drift below ±0.05 percent full scale. Additionally, this device promises to deliver a hysteresis-free output signal. A non-linearity error of ±0.2 percent and a noise performance of ±0.005 percent full scale enable precise current measurements with a signal bandwidth of up to 8 kHz. Temperature-dependent gain and offset of the sensor can be easily adjusted to the magnetic circuitry by programming the non-volatile memory.
According to ISO 26262 with several onboard diagnostic functions, which build a basis for current sensor modules with a higher ASIL level using redundancy techniques or a combination with other current sensing technologies, the CUR 4000 is defined as SEooC ASIL-B ready. CUR 4000 is available in a small eight-pin SOIC8 SMD package for less complex assembly and its production is scheduled to start in the second quarter of 2021, but the samples of the sensor are already available.
Key Features of CUR 4000 Sensor
- Multi-Hall-array sensor technology for high-precision core-based current sensing
- Configurable for highly accurate linear current sensing with a read-out of multi-Hall-array or differential coreless and stray-field robust current sensing
- Contactless current sensing (non-intrusive)
- SEooC ASIL-B ready according to ISO 26262 to support Functional Safety applications
- Digital (SPI) interface for direct microcontroller connectivity and sensor programming
- Sleep modes (wake-up pin) for low power consumption
- Automotive temperature grade (TA = -40 °C up to 150 °C)