SI7210-B-04-IV Silicon Labs

2 Si7210 I C Hall Effect Magnetic Position and Temperature Sensor Data Sheet The Si7210 family of Hall effect magnetic sensors from Silicon Labs combines a chop- per-stabilized Hall element with a low-noise analog amplifier, 13-bit analog-to-digital FEATURES 2 converter, and an I C interface. Leveraging Silicon Labs proven CMOS design techni- ques, the Si7210 family incorporates digital signal processing to provide precise com- High-Sensitivity Hall Effect Sensor pensation for temperature and offset drift. Adjustable Full Scale (Standard Offerings are 20mT and 200 mT Full Compared with existing Hall effect sensors, the Si7210 family offers industry-leading Scale) sensitivity, which enables use with larger air gaps and smaller magnets. The integrated Integrated Digital Signal Processing for 13-bit high-precision ADC delivers high output linearity with very low noise for the high- Temperature and Offset Drift est measurement accuracy. For battery-powered applications, the Si7210 family offers Compensation very low power consumption to improve operating life. High-Precision 13-bit Signal Path Output Bandwidth up to 20 kHz 2 The Si7210 family supports a bidirectional I C interface which provides full configurabili- Sensitivity Drift < 5% over 0-70 C ty of the Hall effect sensor operate and release points. At any time, the 13-bit magnetic 2 2 Digital I C Interface field strength can be read through the I C interface. 2 Four Selectable I C Addresses Applications Optional Digital Alert Output Wide 1.7 to 5.5 V Power Supply Voltage Speed sensing Mechanical position sensing in consum- Temperature Sensor Data also available er, industrial applications Utility meters 2 by I C (accuracy 1C) Replacement of reed switches Control knobs and selector switches Low 50 nA Sleep Mode Current Fluid level measurement Consumption Industry-Standard Packaging Surface-Mount SOT23-5 1.4 x 1.6 mm 8-pin DFN package Hall Element Si7210 SCL ADC SDA DSP & Control Logic Temp / Offset / Reg Mechanical Stress ALERT VDD Compensation GND silabs.com Building a more connected world. Rev. 1.2 Table of Contents 1. Electrical Specifications ...........................3 2. Functional Description............................8 2 3. I C Interface................................9 4. Register Definitions............................ 11 4.1 Field Descriptions.............................11 4.1.1 Chip ID...............................11 4.1.2 Fields Associated with Reading DATA ....................12 4.1.3 Fields Associated with Configuring the Output Pin.................13 4.1.4 Registers Associated with Control of Idle Time..................14 4.1.5 Registers Associated with Setting the Output Scale ................15 4.1.6 Registers Associated with Adding Digital Filtering.................15 4.1.7 Registers to Read OTP Data........................16 4.1.8 Control of On-Chip Test Coil........................17 5. Making Temperature Measurements...................... 18 6. Pin Descriptions ............................. 19 6.1 SOT-23 Pin Description...........................19 6.2 DFN Pin Description............................20 7. Ordering Information ........................... 21 8. Package Outline ............................. 24 8.1 SOT23-5 5-Pin Package...........................24 8.2 TDFN 8-Pin Package............................26 9. Land Patterns .............................. 28 9.1 SOT23-5 5-Pin PCB Land Pattern .......................28 9.2 TDFN 8-Pin PCB Land Pattern ........................29 10. Top Marking .............................. 30 10.1 SOT23-5 5-Pin Top Marking.........................30 10.2 TDFN 8-Pin Top Mark...........................31 11. Revision History............................. 32 silabs.com Building a more connected world. Rev. 1.2 2