Si7210 Hall Effect Magnetic Sensor

The Si7210 sensors allow you to control and configure the device, and let you read the magnetic field data over I2C on demand. The devices also have a configurable digital output to allow the host to be interrupted when specified events happen. This makes them ideal replacements for both switch/latch and linear output magnetic sensors.

AN1018: Using the Si72xx Hall Effect Sensors

Electrical, mechanical, and magnetic considerations surrounding the use of Si72xx devices.

Features

  • Ultra low power: 100nA sleep power; 400nA for 5 samples/second
  • Configure device, access data, and wake/sleep available over I2C
  • High Linearity: 0.1%
  • Low noise: < 30 µT RMS
  • Built-in 1C accurate temp sensor
  • Built in coil to generate test magnetic field
  • Unipolar/Omnipolar Switch and Latch outputs available
  • 1.71 V - 5.5 V supply range
  • Available in 0 to 70 °C and -40 to 125 °C variants
  • Available in industry standard SOT23 packages

Si7210 Product Matrix

Devices
Part Number Data Sheet Dev Kit Description idd (typ) (µA) I²C Address Bop (max) Brp (min) |Bop-Brp| (typ) Full Scale Field Strength (mT) Sample Rate (Hz) Tamper Threshold (mT) Temp. Accuracy typ (°C) Temperature Range (°C) Package Type
Si72XX-WD-KIT Push-Pull Output 0.4 0x30 1.1 0.2 0.4 20 5 19.84 ±1.0 -40 125 SOT23-5
Si72XX-WD-KIT Open Drain Output 0.4 0x30 1.1 0.2 0.4 20 5 19.84 ±4.0 -40 125 SOT23-5
Si72XX-WD-KIT Push-Pull Output 0.4 0x31 1.1 0.2 0.4 20 5 19.84 ±4.0 -40 125 SOT23-5
Si72XX-WD-KIT Push-Pull Output 0.4 0x32 1.1 0.2 0.4 20 5 0 ±4.0 -40 125 SOT23-5
Si72XX-WD-KIT Push-Pull Output 0.4 0x33 1.1 0.2 0.4 20 5 0 ±4.0 -40 125 SOT23-5
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