magnetic sensors - silicon labs · pdf filethe following table shows the key distinctions...

Magnetic SensorsPRODUCT SELECTOR GUIDE

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Magnetic SensorsLow power, high sensitivity sensors with industry leading fl exibility and programmability for open/close and position sensing applications

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Solving your position sensing and open/close detection problems

Low Power <400 nA for 5 Hz Sampling Rate <100 nA 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 100 nA sleep current, and <400 nA 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), and

is fully automotive qualified.

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 <0.9 mT Bop <30 uT RMS Noise <0.1% Linearity 20 mT and 200 mT Ranges

Reliability <0.9 mT 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 +/-1 °C 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.

Automotive

Use the Si720x (switch/latch) and the Si721x (linear output) devices to enhance performance in all automotive applications, from open/close to position sensing applications. The family is AECQ-100 qualified, and select Si721x parts offer support for the SENT protocol.

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 AutomationDoor and Window Sensors Control Panel Dials and Buttons

White GoodsDoor | Lid Open | CloseDial PositionButton Replacement

Consumer ElectronicsTablet/Phone Cover Open/CloseKnob/Joystick PositionObject Proximity Detection

MeteringFlow Speed MonitoringTamper DetectionLid Open Detection

AutomotiveDoor Open/CloseMechanical ButtonReplacementConsole ControlsGear Knob IndicatorPedal Controls

IndustrialMotor ControlRotary EncodersIndustrial Smoke Alarms


The following table shows the key distinctions between our three families of hall-effect based magnetic sensors.

Choosing the Right Si72xx Device for your Application

FEATURE Si720x Si7210 Si721x

Output Type Switch and Latch Digital Outputs I2C Linear Output

Package Type 3 pin and 5 pin SOT-23 5 pin SOT-23 3 pin and 5 pin SOT-23

Output Configurations Omnipolar and Latch Outputs I2C and Digital interruptsAnalog , PWM and SENT outputs

Additional FeaturesTamper detection Magnetic tempco compensation

Built in temp sensor Digital Interrupts and disable pin available Magnetic Self-test feature Tamper detection Magnet Tempco compensation

Disable pin available

Supply VoltageHV and LV options (1.71-5.5 V or 3.3-26.5 V)

LV only (1.71-5.5 V) HV and LV options (1.71-5.5 V or 3.3-26.5 V)

The Si720x switch and latch devices have a digital output that changes state with change in magnetic field settings. This product family has two different output types - omnipolar and latch type outputs. Their operation is illustrated below (Bop is the magnetic field above which the output turns “on”, and Brp is the field strength below which it turns off. The difference gives you hysterysis for stable operation)same device to be used across multiple projects and platforms.

Si720x - Switch and Latch Devices

Please consult the chart on the following page for detailed switch and latch sensor specifications.

LatchOmnipolar Switch with Tamper


PART NUMBER

OUTPUT TYPE

OUTPUT POLARITY

(HIGH FIELD)

IDD (TYP.

@3.3 V)BOP, BRP

MAGNETIC FIELD

FULL SCALE

SLEEP/IDLE TIME

TEMPERATURE COMPENSATION

TAMPER THRESHOLD

(TYP.)

DIGITAL FILTERING VDD

3-pin Switches (SOT23-3 package). Temperature rating 0 to 70 °C

Si7201-B-00-FV(R)

Omnipolar Switch

Low (push-pull) 0.4 µA

BOP = ±1.1 mT (max)BRP = ±0.2 mT (min)

|BOP - BRP| = 0.4 mT (typ20 mT 200 msec

(sleep) None None None 1.7 - 3.6 V

Si7201-B-01-FV(R)

Omnipolar Switch



|BOP - BRP| = 0.4 mT (typ)20 mT 200 msec

(sleep) None ±19.8 mT None 1.7 - 3.6 V

Si7201-B-02-FV(R)

Omnipolar Switch

High(push-pull) 1.1 µA



(sleep) 0.12%/°C ±19.8 mT 4 sample FIR

1.7 - 3.6 V

3-pin Switches (SOT23-package). Temperature rating -40 °C to 125 °C

Si7201-B-03-IV(R)

Omnipolar Switch

High(push-pull) 57 µA




Si7201-B-04-IV(R)

Omnipolar Switch





Si7201-B-05-IV(R)

Omnipolar Switch





Si7201-B-06-IV(R)

Omnipolar Switch

Low (open drain) 0.4 µA




Si7201-B-07-IV(R)

Omnipolar Switch





3 pin Latches(SOT23-3 package). Temperature rating 0 to 70 °C

Si7202-B-00-FV(R) Latch High

(push-pull) 0.4 µA

BOP(max) = +0.65 mTBOP(min) = +0.15 mT BRP(min) = -0.65 mT BRP(max) = -0.15 mT

|BOP - BRP| = 0.8 mT (typ)

20 mT 200 msec (sleep) None None None 1.7 -

3.6 V

Si7202-B-01-IV(R) Latch Low

(push-pull) 0.4 µA



20 mT 200 msec (sleep) None None None 1.7 -

5.5 V

5 pin Switches(SOT23-5 package). Temperature rating 0 to 70 °C; includes disable pin

Si7203-B-00-FV(R)

Omnipolar Switch

High (open drain)

0.4 mA (typ)

0.1 µA (DIS high)


|BOP - BRP| = 0.4 mT (typ)20 mT 1 msec (idle) None ±19.8 mT None 1.7 -

3.6 V

5 pin Latches(SOT23-5 package). Temperature rating 0 to 70 °C; includes disable pin

Si7204-B-00-FV(R) Latch High

(push-pull)

0.4 mA (typ)

0.1 µA (DIS high)



20 mT 1 msec (idle) None None None 1.7 - 3.6 V

High Voltage Switches(SOT23-3 package). Temperature Rating -40 °C to 125 °C

Si7205-B-00-IV(R)

Omnipolar Switch

Low (open drain) 950 µA



(idle) None None None 3.3 - 26.5 V

High Voltage Latches(SOT23-5 package). Temperature Rating -40 °C to 125 °C

Si7206-B-00-IV(R) Latch Low

(open drain) 950 µA



20 mT 1 msec (idle) None None None 3.3 -

26.5 V

ssundar

Cross-Out

950

ssundar

Cross-Out

950

ssundar

Cross-Out

1

ssundar

Cross-Out

1


PART NUMBER

OUPUT TYPE

OUTPUT POLARITY

IDD (TYP.

@3.3 V)DEFAULT BOP, BRP

MAGNETIC FIELD FULL

SCALE

SLEEP/IDLE TIME

TEMP SENSOR

ACCURACY

TAMPER THRESHOLD

I2C ADDRESS

Si7210 I2C Devices (SOT23-5 package). VDD = 1.7-5.5 V. Temperature Rating -40 °C to 125 °C.

Si7210-B-00-IV(R)

I2C, Omnipolar

Switch(high field) 0.4 µA


|BOP - BRP| = 0.4 mT (typ)20 mT

200 msec (sleep) ±1.0 °C 19.84 mT 0 x 30

Si7210-B-01-IV(R)

I2C, Omnipolar

Switch




200 msec (sleep) ±1.0 °C 19.84 mT 0 x 30

Si7210-B-02-IV(R)

I2C, Omnipolar

Switch




200 msec (sleep) ±4.0 °C 19.84 mT 0 x 31

Si7210-B-03-IV(R)

I2C, Omnipolar

Switch



|BOP - BRP| = 0.4 mT (typ20 mT

200 msec (sleep) ±4.0 °C None 0 x 32

Si7210-B-04-IV(R)

I2C, Omnipolar

Switch




200 msec (sleep) ±4.0 °C None 0 x 33

Si7210-B-05-IV(R)

I2C, Omnipolar

Switch




200 msec (sleep) ±4.0 °C None 0x33

PART NUMBER DESCRIPTION OUPUT TYPE OUTPUT

POLARITYIDD (TYP.

@3.3 V)SAMPLING

RATE SCALE BIST VDD PACKAGE

Si7211-B-00-IV(R)

Mangetic Sensor Linear Analog Analog Increasing

Voltage 5.5 mA 7 kHz 20 mT No 2.25 - 5.5 V SOT23-5

Si7212-B-00-IV(R)

Mangetic Sensor Linear PWM

250 Hz PWM

Increasing Pulsewidth 560 µA 300 Hz 20 mT No 1.7 - 5.5 V SOT23-3

Si7213-B-00-IV(R)

Mangetic Sensor Linear SENT

SENT (Open Drain) Increasing 1.02 mA 1 kHz 20 mT No 1.7 - 5.5 V SOT23-3

Si7214-B-00-IV(R)

Mangetic Sensor Linear PWM

100 Hz PWM

Increasing Pulsewidth 1.02 mA 150 Hz 20 mT No 3.3 - 26.5 V SOT23-3

Si7215-B-00-IV(R)

Mangetic Sensor Linear SENT

SENT (Open Drain) Increasing 1.7 mA 1 kHz 20 mT

Yes (Hold OUT

low)3.3 - 26.5 V SOT23-3

Si7216-B-00-IV(R)


Voltage1.7 mA 1 kHz 20 mT No 4.0 - 26.5 V SOT23-3

Si7217-B-01-IV(R)


Voltage

5.5 mA (50 nA

DIS)7 kHz 20 mT

Yes (Separate

Pin)2.25 - 5.5 V SOT23-5

Si7210 - I2C Magnetic Sensors

These sensors allow you to control and configure the device, and let you read the magnetic field data over I2C on demand. They also

have a configurable digital output. This makes them ideal replacements for both switch/latch and linear output magnetic sensors.

The Si721x Linear output magnetic sensors bring class leading linearity and noise performance, while maintaining pin compatibility with many existing sensors. This allows you to reduce the size of your magnetics and improve performance with your existing design.

Si721x - Linear Output Magnetic Sensors


Hardware and Software SupportFind the development tools you need for your magnetic sensor design. Access all of these tools at silabs.com/magnetic-sensors

UG288 : Si72xx-WD-Kit User’s Guide and Videos

This user guide shows you how to get started with the kit, and also has comprehensive documentation on all it’s features.silabs.com/magnetic-sensors contains links to videos that show how to use this kit.

AN1018 : Using the Si72xx Hall-Effect Magnetic

Position Sensors

This application note is a comprehenseive document that covers many aspects of desiging systems with the Si72xx series of parts. Topics covered include:

1. Replacing Reed Switches

2. Optimizing Magnet Selection

3. Layout Considerations

4. Position Measurement Using Magnetic Sensors

4. Selecting the Right Part and Settings for Your Application

and more....

Si72xx-WD-KIT

The Si72xx-WD-KIT consists of a pre-programmed EFM32 Happy Gecko SDK, a wheel demo expansion board, and six postage- stamp-sized evaluation boards.

Wheel Demo

The expansion boards shows an example of degree accurate rotational position sensing using two Si7210 sensors. It also includes a demonstration for low power revolution counting and quadrant detection in conjucntion with the low power EFM32 Happy Gecko MCU.

Postage Stamp Boards

The kit also includes six “postage stamp” boards - ranging from switch and latch parts to I2C and analog output devices. These boards can be connected to the wheel demo expansion board using a fl ex cable for a quick, fl exible evaluation platform. The postage stamp boards also feature easy to use test points and connectors to allow you to use them for prototyping purposes by themselves as well.

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