Magnetic Sensors
PRODUCT SELECTOR GUIDE
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Magnetic Sensors
Low power, high sensitivity
sensors with industry leading
flexibility and programmability
for open/close and position
sensing applications
www.silabs.com | Smart. Connected. Energy-Friendly. 1
Solving your position sensing and open/close
detection problems
Low Power
<400nA for 5 Hz Sampling Rate
<100nA Sleep Current
With the Si72xx, you can finally add reliable hall effect based
sensors to battery powered systems without impacting their
battery life. At under 100nA sleep current, and <400nA for a 5
Hz sampling rate, they can help achieve multiyear and decade
lifetimes, even for systems powered with very small batteries.
The extremely high sensitivity of the Si72xx devices lets you
reduce the size of your magnetics or extend your range, often
by a factor of two or more. This means you can reduce the
cost and footprint of your magnetics. The extended range
leads to enhanced flexibility and improved ease of use.
Replace unreliable and bulky mechanical solutions (like reed
switches) with the solid state reliability of the Si72xx. The
Si72xx is based on proven hall-effect based technology. It is
also capable of operating over -40 to 125°C (select parts).
Bringing hall sensors into the modern age, the Si72xx allows you
to configure, measure and control the device over I2C. This gives
you ultimate flexibility during design and in your end application.
Reuse a single electrical design for multiple mechanical
platforms. Save system power by measuring the magnetic
field digitally rather than through an analog output. Program
thresholds in system to get higher accuracy and flexibility.
The built in tamper threshold (on select parts) allows you to
to detect attempts to bypass security. The built-in coil can be
configured to generate a known magnetic field. This can be
used to simply final test and product calibration, as well as to
verify the operation of the part once it is deployed in the field.
The Si72xx family offers parts with compensation for the
temperature dependence of ceramic and neodymium
magnets - eliminating a common source of error for precise
measurements.
The Si72xx (on selected parts) also contains a 1°C accurate
temp sensor, which can be accessed via I2C This allows you
to reduce your BOM and add functionality.
High Sensitivity
<0.9mT Bop
<30 uT RMS Noise
<0.1% Linearity
20 mT and 200 mT Ranges
Reliability
<0.9mT Bop
<30 uT RMS noise <0.1% Linearity
20 mT and 200 mT Ranges
I2C Programmability
I2C Configurable Thresholds
Read Magnetic Field Strength Over I2C
Control Device On/Off Operation
Advanced Features
Tamper Detection / Second Threshold
Magnet Tempco Compensation
Built-in Coil to Generate Test Magnetic Field
Built-in +/-1C Temp Sensor Over I2C
2 I Magnetic Sensor Product Selector Guide
Security Systems and
Home Automation
With the Si720x series of parts, you can get rid
of unreliable reed switches and still maintain long
battery life in battery powered door and window
sensors. The Si7210 series adds I2C functionality,
and lets you read the magnetic field strength for
position applicatons.
White Goods
Replace your existing open/close sensors and
buttons with the Si720x series of parts to reduce
magnet size and cost, and improve reliability over
mechanical solutions.
Consumer Electronics
Use the Si720x parts to reduce magnet size and
save power when detecting lid or cover open/
close. Use the Si7210 and Si721x series devices
for accurate, power effeicient position sensing in
applications like dial and joystick position detection.
Metering
Replace reed switches with the Si720x devices
to save power and improve reliability for flow
detection. Use the Si7210 and it’s advanced
features like tamper detection and built-in temp
sensor to reduce BOM and cost.
Industrial
Use Si721x devices to measure motor speed and
position with higher accuracy and reliability, while
reducing magnetics and cost. Use the SI702x for
industrial switch and smoke alarm test applications
to improve battery life and lower cost.
Best-in-Class Performance for Multiple Applications
Magnetic Sensor Applications
Security Systems +
Home Automation
Door and Window Sensors
Control Panel Dials and
Buttons
White Goods
Door | Lid Open | Close
Dial Position
Button Replacement
Fluid Level Sensing
Consumer Electronics
Tablet/Phone Cover Open/
Close
Knob/Joystick Position
Object Proximity Detection
Metering
Flow Speed Monitoring
Tamper Detection
Lid Open Detection
Industrial
Motor Control
Rotary Encoders
Industrial Smoke Alarms