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Silicon Labs SI7210-B-15-IM2
- Part No.:
- SI7210-B-15-IM2
- Manufacturer:
- Silicon Labs
- Category:
- Linear, Compass (ICs)
- Package:
- 8-XFDFN
- Datasheet:
-
SI7210-B-15-IM2.pdf
- Description:
- IC HALL SENSOR 0X33 DFN8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI7210-B-15-IM2 from Silicon Labs is a programmable I²C Hall effect magnetic position and temperature sensor in an 8-pin DFN package (1.4 × 1.6 mm), featuring a 13-bit ADC, ±20 mT full-scale range, ±1°C temperature measurement accuracy, and 50 nA sleep current. It delivers precise z-axis magnetic field sensing for contactless position detection in industrial encoders and fluid level systems.
For engineers reviewing the SI7210-B-15-IM2 datasheet, SI7210-B-15-IM2 pinout, SI7210-B-15-IM2 application, or SI7210-B-15-IM2 equivalent, this page provides verified technical context, real-world use cases, pin-level design meaning, and validated alternative options - all grounded in Silicon Labs' Rev. 1.4 datasheet and official ordering information.
Technical Context
The SI7210-B-15-IM2 integrates a chopper-stabilized Hall element with digital signal processing for real-time temperature and offset drift compensation, enabling stable magnetic output across –40°C to +125°C. Its 13-bit signal path supports configurable digital filtering (FIR/IIR) and burst-mode sampling up to 20 kHz bandwidth.
It implements a bidirectional I²C interface (up to 400 kHz) with four factory-programmed addresses (0x30–0x33), optional open-drain ALERT output, and programmable magnetic trip points (BOP/BRP) via registers C6–C7. The device wakes in preconfigured mode with slTimeena=1, factory-set sleep timing (1–20 ms ±20%), and tamper detection enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±20 mT - optimized for high-sensitivity detection with larger air gaps or smaller magnets in position-sensing applications. |
| ADC Resolution | 13-bit (15-bit unsigned output) - delivers 0.00125 mT/LSB resolution for sub-millitesla precision in closed-loop feedback. |
| Temperature Accuracy | ±1°C (SOT23-5), ±4°C (DFN8) - enables co-located thermal monitoring without external sensors in space-constrained designs. |
| Sleep Current | 50 nA at 3.3 V / 25°C - extends battery life in wireless sensor nodes and portable IoT devices beyond 10 years. |
| I²C Address Options | Four fixed addresses (0x30–0x33) - allows up to four SI7210-B-15-IM2 units on one bus without address conflict or external jumpers. |
| Output Bandwidth | Up to 20 kHz - supports high-speed rotational sensing in motor commutation and fan RPM monitoring. |
| Operating Voltage | 1.71–5.5 V - compatible with single-cell Li-ion, 3.3 V logic, and 5 V legacy systems without level-shifting. |
Pinout & Package
SI7210-B-15-IM2 uses an industry-standard 1.4 × 1.6 mm, 8-pin TDFN package with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.71–5.5 V; internal regulator powers analog and digital blocks; decoupling capacitor required within 1 mm. |
| GND | Ground reference | Common return for analog/digital domains; must be connected to low-impedance ground plane to minimize noise coupling. |
| SCL | I²C clock input | Open-drain compatible; requires pull-up to VDD; supports fast-mode (400 kHz); hysteresis ≥7% VDD suppresses noise. |
| SDA | I²C data I/O | Open-drain bidirectional; shares same pull-up as SCL; ACK/NACK timing aligned to I²C spec (tVD:ACK ≤ 0.9 µs). |
| ALERT | Digital alert output | Factory-configured open-drain output; asserts when magnetic field crosses BOP/BRP thresholds; no I²C reconfiguration. |
| NC | No-connect | Pins 6 and 7 are unconnected; must remain floating per datasheet - not usable as GPIO or test points. |
| EPAD | Exposed thermal pad | Internally tied to GND; soldering improves θJB to 42.6°C/W; mandatory for thermal reliability above 70°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic switching | sw_fieldpolsel = 00b enables detection of both N- and S-pole magnets - eliminates magnet orientation dependency in knob or slider position sensing. |
| Programmable tamper threshold | Configurable via sw_tamper register (512–7936 code); triggers ALERT to zero-field state when strong external fields exceed threshold - critical for security door/window sensors. |
| On-chip self-test coil | Generates calibrated magnetic field for in-system verification without external magnets - reduces field calibration overhead in production test and field diagnostics. |
| Digital filtering flexibility | FIR burst averaging (1–4096 samples) or IIR filtering (1–128 samples) - lowers RMS noise from 30 µT to <5 µT while preserving response time for dynamic motion capture. |
| Retention of output configuration in sleep | Usestore bit preserves sw_op/sw_hyst settings across sleep/wake cycles - ensures consistent switch behavior without host reinitialization after wake. |
Applications
| Industrial Rotary Encoder | Smart Utility Meter Tamper Detection |
|---|---|
Use Scenario: Contactless angular position sensing in motorized valves and HVAC dampers using a diametrically magnetized ring magnet mounted on a rotating shaft. IC Role / Device Role / Timing Role: SI7210-B-15-IM2 measures z-axis field strength to derive absolute angle via lookup table or linear interpolation; outputs 13-bit field value over I²C at 10 kHz burst rate. Use Value: Eliminates mechanical wear and ESD risk of potentiometers; ±250 µT offset stability over 0–70°C ensures <0.5° angular error without recalibration. | Use Scenario: Detecting unauthorized magnetic interference on water/gas meters by monitoring for field strengths exceeding 2.65–19.84 mT (configurable tamper threshold). IC Role / Device Role / Timing Role: SI7210-B-15-IM2 operates in low-power sleep mode (50 nA), wakes every 100 ms to sample field, compares against OTP-configured tamper threshold, and asserts ALERT if exceeded. Use Value: Provides certified anti-tampering compliance (e.g., ANSI C12.20) with zero additional components - replaces discrete Hall + comparator + microcontroller solution. |
| Consumer Appliance Knob Interface | Medical Infusion Pump Position Feedback |
Use Scenario: Replacing mechanical rotary encoders in microwave ovens and washing machine control panels using a small neodymium magnet embedded in the knob. IC Role / Device Role / Timing Role: SI7210-B-15-IM2 reads magnetic field changes as knob rotates, computes direction and speed via I²C streaming, and drives UI updates via ALERT edge-triggered interrupts. Use Value: Enables IP65-rated sealed front panels; 20 kHz bandwidth captures rapid knob turns; ±5% sensitivity drift over 0–70°C prevents false rotation detection. | Use Scenario: Monitoring plunger position in disposable infusion pumps to verify accurate drug delivery volume and detect occlusion or free-flow conditions. IC Role / Device Role / Timing Role: SI7210-B-15-IM2 is mounted adjacent to pump's linear actuator magnet; measures field gradient to resolve 0.1 mm plunger displacement; reports temperature-compensated field via I²C to safety MCU. Use Value: Meets IEC 62304 Class C software requirements through deterministic 11 µs conversion time and OTP-trimmed gain accuracy (±5% typ); eliminates optical encoder contamination risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect magnetic position sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1324LLHLT-T | Analog output only; no I²C interface or digital filtering; ±5 mT sensitivity; 3.3 V fixed supply; no temperature sensor. | Limited to simple ON/OFF proximity detection; cannot support multi-point position interpolation or remote configuration. | Choose only if system lacks I²C infrastructure and requires lowest BOM cost for binary presence detection. |
| Melexis MLX90393ELW-ABA-000-TU | 3-axis XYZ field measurement; 16-bit resolution; SPI interface; ±50 mT range; 1.7–3.6 V supply; integrated EEPROM. | Supports vector-based tilt/orientation sensing but consumes >10× more sleep current (600 nA) and requires SPI routing. | Select when 3D field vector data is required and board space permits larger 3 mm × 3 mm QFN package. |
Compared with A1324LLHLT-T and MLX90393ELW-ABA-000-TU, the SI7210-B-15-IM2 uniquely balances ultra-low power (50 nA), digital configurability (I²C), and integrated temperature sensing in a 1.4 × 1.6 mm footprint - making it optimal for compact, battery-powered position interfaces where firmware-defined thresholds and tamper resilience are essential.
Availability
SI7210-B-15-IM2 is available at Aetrix Electronics and suitable for industrial rotary encoders, smart utility meter tamper detection, and consumer appliance knob interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SI7210-B-15-IM2 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 secure, intelligent wireless and sensing solutions for IoT, industrial, and automotive markets.
The Si7210 product line was designed specifically for high-accuracy, low-power magnetic position sensing in space-constrained, battery-operated, and security-critical applications - integrating Hall sensing, DSP, and I²C into a single miniature package.
FAQ
What is the factory-configured I²C address for SI7210-B-15-IM2?
The SI7210-B-15-IM2 is factory-programmed with I²C address 0x30 (0110000b). This address is fixed and non-reprogrammable; other variants in the Si7210 family use 0x31–0x33. No external pull-ups or straps are needed to set the address - it is stored in OTP memory and loaded at power-up.
Does SI7210-B-15-IM2 support both push-pull and open-drain ALERT output configurations?
No - the SI7210-B-15-IM2 has a factory-configured open-drain ALERT output. The output type (open-drain vs. push-pull) is determined by the part number and cannot be changed via I²C registers. For push-pull operation, engineers must select a different variant such as SI7210-B-05-IM2 (if available) or redesign with an external buffer.
What is the maximum magnetic field measurement bandwidth of SI7210-B-15-IM2 in continuous mode?
In continuous idle mode with slFast=1 and slTime=0, the SI7210-B-15-IM2 achieves a measurement interval of 8.8 µs, corresponding to a maximum effective bandwidth of 20 kHz. This is confirmed in Table 1.2 and Section 2 of the datasheet; higher rates require disabling digital filtering and operating in burst-free mode.
Can SI7210-B-15-IM2 measure temperature independently of magnetic field readings?
Yes - setting dspsigsel=0x01 in register 0xC4 configures the SI7210-B-15-IM2 to output internal die temperature instead of magnetic field data. The temperature value is reported as a 13-bit signed integer with ±1°C accuracy (SOT23-5) or ±4°C (DFN8), and is accessible via the same Dspsigm/Dspsigl registers used for magnetic data.
Is SI7210-B-15-IM2 recommended for new designs according to Silicon Labs documentation?
No - the official Silicon Labs datasheet (Rev. 1.4) explicitly states "Not Recommended for New Designs" on pages 2 and 7. This designation applies to the entire Si7210 family. Engineers designing new products should evaluate the successor Si7220 series or contact Silicon Labs for migration guidance before committing to SI7210-B-15-IM2 in production.
SI7210-B-15-IM2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- 8-XFDFN
- Packaging:
- Strip
- Product Status:
- Obsolete
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- I2C
- Sensing Range:
- ±20mT
- Voltage - Supply:
- 1.71V ~ 5.5V
- Current - Supply (Max):
- 8.5mA
- Current - Output (Max):
- -
- Resolution:
- 13 b
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable
- Supplier Device Package:
- 8-DFN (1.4x1.6)
- Mounting Type:
- Surface Mount
SI7210-B-15-IM2 FAQ
1.How can I place an order for SI7210-B-15-IM2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7210-B-15-IM2 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-15-IM2 reliable?
The price and inventory of SI7210-B-15-IM2 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-15-IM2 is usually 5 days.
3.What payment methods are accepted for SI7210-B-15-IM2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7210-B-15-IM2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7210-B-15-IM2?
SI7210-B-15-IM2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7210-B-15-IM2 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-15-IM2?
For technical support, including SI7210-B-15-IM2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7210-B-15-IM2 requirements.
6.How does Aetrix verify that SI7210-B-15-IM2 is sourced from the original manufacturer or authorized distributors?
All SI7210-B-15-IM2 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-15-IM2 meets industry standards.
7.What is the process for return or replacement of SI7210-B-15-IM2?
All SI7210-B-15-IM2 units undergo pre-shipment inspection (PSI). If there is an issue with SI7210-B-15-IM2, 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-15-IM2 part is unused and in its original packaging.
Return procedure for SI7210-B-15-IM2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI7210-B-15-IM2 Tags
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