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Silicon Labs SI7210-B-01-IV
- Part No.:
- SI7210-B-01-IV
- Manufacturer:
- Silicon Labs
- Category:
- Linear, Compass (ICs)
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SI7210-B-01-IV.pdf
- Description:
- SENSOR HALL EFFECT I2C SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,671
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Product details
Overview
SI7210-B-01-IV from Silicon Labs is a programmable I²C Hall effect magnetic position and temperature sensor in SOT23-5 package, featuring 13-bit ADC resolution, ±20 mT full-scale range, ±1°C temperature accuracy, and 50 nA sleep current. It delivers precise z-axis magnetic field measurement for contactless position sensing in industrial encoders and consumer control knobs.
For engineers reviewing the SI7210-B-01-IV datasheet, SI7210-B-01-IV pinout, SI7210-B-01-IV application, or SI7210-B-01-IV equivalent, key selection criteria include its factory-configured 20 mT range, fixed SOT23-5 5-pin package with open-drain ALERT output, I²C address 0x30, and integrated temperature compensation enabling stable operation from –40°C to +125°C.
Technical Context
The SI7210-B-01-IV integrates a chopper-stabilized Hall element, low-noise analog amplifier, and digital signal processor that applies real-time temperature and offset drift compensation. Its 13-bit signal path supports up to 20 kHz output bandwidth with <±5% sensitivity drift over 0–70°C.
It operates on a 1.7–5.5 V supply and uses a bidirectional I²C interface compliant with Fast Mode (400 kHz) timing. The device supports four factory-programmed I²C addresses (0x30–0x33); SI7210-B-01-IV is fixed at 0x30. Its ALERT pin is configured as open-drain with programmable magnetic trip points (BOP/BRP) and tamper detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±20 mT - optimized for high-sensitivity position detection with larger air gaps and smaller magnets |
| ADC Resolution | 13-bit - provides 0.00125 mT/LSB granularity for precise field quantization |
| Temperature Accuracy | ±1°C (SOT23-5) - enables simultaneous magnetic and thermal monitoring without external sensors |
| Sleep Current | 50 nA @ 3.3 V, 25°C - extends battery life in portable and energy-harvesting applications |
| I²C Address | 0x30 - fixed factory-programmed address simplifies multi-sensor bus configuration |
| Output Bandwidth | Up to 20 kHz - supports high-speed rotational sensing in motor commutation and fan tachometers |
| Operating Voltage | 1.71–5.5 V - compatible with single-cell Li-ion, 3.3 V logic, and 5 V legacy systems |
Pinout & Package
SOT23-5 surface-mount package (1.6 × 1.4 × 1.1 mm), industry-standard footprint with exposed pad not present. RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 1.71–5.5 V nominal; internal regulator powers analog and digital blocks |
| GND | Ground reference | Common return for analog/digital circuits; must be low-impedance for noise immunity |
| SCL | I²C clock input | Open-drain compatible; requires external pull-up; supports 400 kHz Fast Mode |
| SDA | I²C data bidirectional | Open-drain compatible; shares bus with other I²C devices; ACK/NACK handled internally |
| ALERT | Digital alert output | Open-drain, factory-configured; asserts low when magnetic field crosses BOP/BRP thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic switching | Configurable via sw_fieldpolsel = 00b - detects both north and south pole proximity without polarity alignment |
| Digital tamper detection | Programmable threshold (512–7936 LSB) - triggers ALERT to zero-field state upon strong external magnet exposure |
| On-chip self-test coil | Internally generated magnetic field - enables system-level functional safety verification without external stimulus |
| Factory-trimmed gain & offset | OTP-stored coefficients (a0–a5) - eliminates need for end-of-line calibration in volume production |
| Configurable digital filtering | FIR or IIR averaging over 1–4096 samples - reduces RMS noise from 30 µT to sub-µT levels for precision position tracking |
Applications
| Rotary Encoder Position Sensing | Reed Switch Replacement |
|---|---|
Use Scenario: Contactless angular position measurement in HVAC damper actuators and appliance control dials. IC Role / Device Role / Timing Role: SI7210-B-01-IV measures z-axis field strength from rotating diametric magnet; outputs linear 13-bit field value via I²C for microcontroller interpolation. Use Value: Eliminates mechanical wear and bounce of potentiometers; achieves ±0.5° repeatability with 20 mT range and onboard temperature compensation. | Use Scenario: Door/window security status detection in smart home panels using small neodymium magnets. IC Role / Device Role / Timing Role: SI7210-B-01-IV acts as programmable magnetic switch with configurable BOP/BRP; ALERT pin drives MCU interrupt on state change. Use Value: Replaces fragile reed switches with solid-state reliability; tamper detection alerts on magnet spoofing attempts. |
| Fluid Level Monitoring | Utility Meter Tamper Detection |
Use Scenario: Non-invasive liquid level sensing in plastic fuel tanks using float-mounted magnet and external SI7210-B-01-IV. IC Role / Device Role / Timing Role: SI7210-B-01-IV reads analog-equivalent magnetic field strength; I²C transfers 13-bit value for linear level mapping. Use Value: Enables hermetic sealing (no tank penetration); 50 nA sleep current supports 10+ year battery life in wireless tank monitors. | Use Scenario: Anti-tampering feature in smart electricity meters detecting unauthorized magnetic field interference. IC Role / Device Role / Timing Role: SI7210-B-01-IV monitors ambient field; triggers ALERT when tamper threshold exceeded, signaling meter firmware. Use Value: Meets IEC 62055-31 anti-tamper requirements; factory-configurable threshold avoids false alarms from Earth's field or nearby motors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect magnetic sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1324LLHLT-T | Analog output only; no I²C interface or digital filtering; ±5 mT range; higher quiescent current (6 mA) | Limited to simple switch or analog ratiometric use; no remote configuration or temperature compensation | Select when cost-sensitive designs require analog output and lack MCU resources for I²C communication |
| Melexis MLX90393ELD-ABA-000-TU | 3-axis XYZ field measurement; 18-bit resolution; SPI/I²C; ±50 mT range; 2.2 µA active current | Supports complex motion tracking and tilt sensing; higher precision but larger DFN16 package | Select when multi-axis field vector analysis or higher resolution is required beyond single-axis position |
Compared with A1324LLHLT-T and MLX90393ELD-ABA-000-TU, the SI7210-B-01-IV uniquely balances ultra-low-power I²C programmability, factory-trimmed 20 mT sensitivity, and integrated tamper detection in a 5-pin SOT23-making it optimal for space-constrained, battery-operated position switches requiring secure, calibrated operation.
Availability
SI7210-B-01-IV is available at Aetrix Electronics and suitable for industrial encoders, smart home security sensors, fluid level transducers, and utility meter anti-tamper modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI7210-B-01-IV includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Silicon Labs is a fabless semiconductor company specializing in mixed-signal ICs for IoT, industrial, and automotive applications, with expertise in low-power sensor interfaces and wireless SoCs.
The Si7210 family was designed specifically for high-accuracy, low-power magnetic position sensing in space-constrained, battery-operated systems-emphasizing factory calibration, robust EMC performance, and seamless integration into I²C-based microcontroller platforms.
FAQ
What is the I²C address of the SI7210-B-01-IV and can it be changed?
The SI7210-B-01-IV has a fixed factory-programmed I²C address of 0x30 (0110000b). This address cannot be modified in-system or via OTP registers-it is hard-coded during manufacturing. For multi-sensor configurations, other variants in the Si7210 family (e.g., SI7210-B-02-IV) offer addresses 0x31–0x33. The SI7210-B-01-IV must be used on a dedicated I²C segment or isolated via multiplexer if co-located with other Si7210 devices.
Does the SI7210-B-01-IV support both unipolar and omnipolar magnetic detection?
Yes, the SI7210-B-01-IV supports both modes via the sw_fieldpolsel register bits. Setting sw_fieldpolsel = 00b enables omnipolar operation-detecting field magnitude regardless of polarity-ideal for push-button or rotary knob applications where magnet orientation varies. Unipolar mode (01b or 10b) responds only to one polarity and is used in directional sensing like door open/close. The SI7210-B-01-IV's default configuration is factory-set but fully reprogrammable over I²C.
What is the purpose of the ALERT pin on the SI7210-B-01-IV and how is it configured?
The ALERT pin on the SI7210-B-01-IV is a factory-configured open-drain digital output that asserts low when the measured magnetic field crosses user-defined operate (BOP) or release (BRP) thresholds. It is not software-reconfigurable between open-drain and push-pull-this is determined by the part number. For SI7210-B-01-IV, ALERT is open-drain and requires an external pull-up resistor. Thresholds and hysteresis are set via I²C registers sw_op and sw_hyst, enabling precise switch behavior without MCU polling.
How does the SI7210-B-01-IV achieve ±1°C temperature measurement accuracy?
The SI7210-B-01-IV achieves ±1°C accuracy (–10°C to +85°C) for its on-chip temperature sensor through factory-trimmed gain and offset coefficients stored in OTP memory (registers 0x1D–0x1E). These coefficients correct for process variation and package-induced thermal gradients. Temperature data is read via I²C register dspsigsel = 0x01, delivering calibrated 13-bit values directly-eliminating the need for external compensation algorithms or lookup tables in the host MCU. The SI7210-B-01-IV reports temperature concurrently with magnetic field data.
Is the SI7210-B-01-IV suitable for automotive applications?
The SI7210-B-01-IV is qualified for industrial temperature range (–40°C to +125°C) and meets AEC-Q200 stress test requirements for passive components, but it is not AEC-Q100 qualified as an integrated circuit. While its electrical specs and thermal performance align with many under-hood or cabin applications (e.g., throttle position, HVAC flap sensing), Silicon Labs explicitly designates it for industrial and consumer use-not automotive safety-critical systems. For automotive deployment, system-level validation per ISO 26262 ASIL requirements and consultation with Silicon Labs' automotive support team is required before using SI7210-B-01-IV.
SI7210-B-01-IV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Strip
- Product Status:
- Not For New Designs
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- I2C
- Sensing Range:
- ±20mT
- Voltage - Supply:
- 1.71V ~ 5.5V
- Current - Supply (Max):
- 0.4µA (Typ)
- Current - Output (Max):
- -
- Resolution:
- 13 b
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable
- Supplier Device Package:
- SOT-23-5
- Mounting Type:
- Surface Mount
SI7210-B-01-IV FAQ
1.How can I place an order for SI7210-B-01-IV through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7210-B-01-IV on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI7210-B-01-IV reliable?
The price and inventory of SI7210-B-01-IV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI7210-B-01-IV is usually 5 days.
3.What payment methods are accepted for SI7210-B-01-IV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7210-B-01-IV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7210-B-01-IV?
SI7210-B-01-IV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7210-B-01-IV order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI7210-B-01-IV?
For technical support, including SI7210-B-01-IV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7210-B-01-IV requirements.
6.How does Aetrix verify that SI7210-B-01-IV is sourced from the original manufacturer or authorized distributors?
All SI7210-B-01-IV products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI7210-B-01-IV meets industry standards.
7.What is the process for return or replacement of SI7210-B-01-IV?
All SI7210-B-01-IV units undergo pre-shipment inspection (PSI). If there is an issue with SI7210-B-01-IV, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI7210-B-01-IV part is unused and in its original packaging.
Return procedure for SI7210-B-01-IV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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