SILICON LABS SI7210-B-00-IVR

The Si7210 family of Hall effect magnetic sensors combines a chopper-stabilized Hall element with a low-noise analog amplifier, 13-bit analog-to-digital converter, and an I²C interface. Leveraging proven CMOS design techniques, it incorporates digital signal processing to provide precise compensation for temperature and offset drift. Compared with existing Hall effect sensors, the Si7210 family offers industry-leading sensitivity, which enables use with larger air gaps and smaller magnets. The integrated 13-bit high-precision ADC delivers high output linearity with very low noise for the highest measurement accuracy. For battery-powered applications, it offers very low power consumption to improve operating life. The Si7210 family supports a bidirectional I²C interface which provides full configurability of the Hall effect sensor operate and release points. At any time, the 13-bit magnetic field strength can be read through the I²C interface. The Si7210 family of parts are I²C programmable Hall effect magnetic position sensors. These parts digitize the component of the magnetic field in the z axis of the device (positive field is defined as pointing into the device from the bottom). The parts are normally used to detect the presence or absence of a magnet in security systems, as position sensors or for counting revolutions. In addition to being able to control the conversion process and read the result of magnetic field conversions by I²C, the 5-pin packages offer an output pin. The output pin can act as an alert (push pull or open collector) which goes high or low when the magnetic field crosses a threshold. Alternatively the output pin can be configured as an analog output. The output pin configuration is determined by the type of part ordered (this is not I²C configurable). The parts are preconfigured for the magnetic field measurement range, sleep time, temperature compensation, tamper threshold, and digital filtering, and will wake into the preconfigured mode when first powered. The specific configuration, as well as the I²C address and output type (open collector or push pull), are determined by the part number. Magnetic field trip points are typically configured by I²C, and the part is allowed to go into its normal sleep and measurement cycle. If the bit Usestore is set to 1, the output pin trip points are retained in sleep mode. Data other than magnetic field trip points is not retained in sleep mode. If there is not a need to go to full sleep mode, the other parameters may be configured, and this data will be kept in idle mode.

• High-Sensitivity Hall Effect Sensor
• Adjustable Full Scale (Standard Offerings are ±20 mT and ±200 mT Full Scale)
• Integrated Digital Signal Processing for Temperature and Offset Drift Compensation
• High-Precision 13-bit Signal Path
• Output Bandwidth up to 20 kHz
• Sensitivity Drift < ±5% over 0 - 70 ℃
• Digital I²C Interface

• Mechanical position sensing in consumer, industrial applications
• Speed sensing
• Utility meters
• Replacement of reed switches
• Control knobs and selector switches
• Fluid level measurement