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Silicon Labs SI7210-B-12-IM2R
- Part No.:
- SI7210-B-12-IM2R
- Manufacturer:
- Silicon Labs
- Category:
- Linear, Compass (ICs)
- Package:
- 8-XFDFN
- Datasheet:
-
SI7210-B-12-IM2R.pdf
- Description:
- IC HALL SENSOR 0X31 DFN8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI7210-B-12-IM2R 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 non-contact position detection in industrial control knobs and utility meter tamper monitoring.
For engineers reviewing the SI7210-B-12-IM2R datasheet, SI7210-B-12-IM2R pinout, SI7210-B-12-IM2R application, or SI7210-B-12-IM2R equivalent, key selection considerations include its factory-configured 20 mT range, DFN-8 package with exposed thermal pad, I²C address 0x32, integrated digital alert output, and OTP-programmed temperature compensation for neodymium magnets.
Technical Context
The SI7210-B-12-IM2R implements a chopper-stabilized Hall element with on-chip DSP for real-time temperature and offset drift compensation, enabling stable magnetic field measurements 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 integrates a factory-programmed digital alert output (push-pull), four selectable I²C addresses (0x30–0x33), and OTP-stored calibration coefficients for ±20 mT range with –0.12%/°C neodymium magnet compensation. The device wakes from 50 nA sleep mode in 1 ms and performs conversions in 11 µs (first) / 8.8 µs (subsequent).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±20 mT - optimized for high-sensitivity detection of small magnets at larger air gaps in mechanical position systems |
| ADC Resolution | 13-bit - provides 0.00125 mT/LSB resolution for sub-millitesla field discrimination |
| Temperature Accuracy | ±1°C (–10°C to +85°C) - enables concurrent thermal monitoring without external sensor in space-constrained designs |
| Sleep Current | 50 nA at 3.3 V, 25°C - extends battery life in wireless sensor nodes and portable industrial devices |
| I²C Interface | Fast-mode (400 kHz), 7-bit address 0x32 - ensures compatibility with standard microcontroller peripherals and reduces firmware overhead |
| Output Bandwidth | Up to 20 kHz - supports high-speed rotational speed sensing in motor feedback and encoder replacement applications |
| Package | 1.4 × 1.6 mm 8-pin TDFN with exposed thermal pad - enables ultra-compact PCB layouts and improved thermal dissipation (θJB = 42.6°C/W) |
Pinout & Package
SI7210-B-12-IM2R uses an 8-pin TDFN (Thin Dual Flat No-lead) package per JEDEC MO-229, 1.4 mm × 1.6 mm body, 0.5 mm pitch, with exposed thermal pad for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 1.71–5.5 V operation; internal regulator powers analog and digital blocks; decoupling capacitor required |
| GND | Ground reference | Common return for analog/digital circuits; connects to exposed thermal pad for thermal and electrical integrity |
| SCL | I²C clock input | Open-drain compatible; requires pull-up resistor; supports 400 kHz fast-mode timing |
| SDA | I²C data bidirectional | Open-drain compatible; shares bus with other I²C devices; supports register read/write sequences |
| ALERT | Digital output (push-pull) | Factory-configured as active-high push-pull; asserts when magnetic field crosses BOP/BRP thresholds; no external pull-up needed |
| NC | No connect | Two pins (pins 6 and 7) are internally unconnected; must be left floating or tied to GND per layout guidelines |
| EPAD | Exposed thermal pad | Electrically connected to GND; soldered to PCB copper pour for thermal conduction and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic switching | Configurable via sw_fieldpolsel=00b - detects both north and south pole proximity without polarity alignment |
| Tamper detection | Programmable threshold (512–7936 LSB) - triggers ALERT output at zero-field state when strong external magnet is applied |
| Digital filtering | FIR or IIR averaging over 1–4096 samples - reduces RMS noise from 30 µT to <5 µT for stable position reporting |
| On-chip self-test coil | Integrated test coil with polarity control - enables in-system functional verification without external equipment |
| OTP-trimmed calibration | Factory-loaded a0–a5 coefficients for ±20 mT + neodymium tempco - eliminates post-assembly calibration effort |
Applications
| Industrial Control Knobs | Utility Meter Tamper Monitoring |
|---|---|
Use Scenario: Rotary position sensing in HVAC thermostats and industrial HMI dials where mechanical wear must be eliminated. IC Role / Device Role / Timing Role: Measures angular displacement via magnet rotation above IC z-axis; outputs 13-bit field strength via I²C at 100 Hz burst rate. Use Value: Enables contactless, dust-resistant position feedback with ±0.5° repeatability and immunity to switch bounce. | Use Scenario: Detecting unauthorized magnetic interference on smart electricity/water meters to prevent fraud. IC Role / Device Role / Timing Role: Monitors ambient field continuously; asserts ALERT when tamper threshold (>2.65 mT) is exceeded, signaling potential meter tampering. Use Value: Provides certified anti-tamper response with zero-field output mimicry, meeting ANSI C12.20 and IEC 62055-41 requirements. |
| Motor Speed Sensing | Reed Switch Replacement |
Use Scenario: Non-contact RPM measurement on BLDC motor shafts using embedded magnets. IC Role / Device Role / Timing Role: Captures field transitions at up to 20 kHz bandwidth; delivers timestamped 13-bit samples via I²C for edge-counting firmware. Use Value: Achieves 1% speed accuracy at 30,000 RPM with no moving parts, outperforming reed switches in lifetime and jitter. | Use Scenario: Door/window open-close detection in security panels replacing fragile glass reed switches. IC Role / Device Role / Timing Role: Configured as latch (sw_op=127) with symmetric BOP/BRP; drives ALERT output directly to microcontroller GPIO. Use Value: Delivers >10M cycle reliability, -40°C to +125°C operation, and ESD-hardened I/O versus 50k-cycle reed limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect magnetic sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1324LLHLT-T | Analog output only; no I²C interface or digital alert; ±5 mT range; SOIC-8 package (3×4.9 mm) | Lacks programmability, temperature reporting, and tamper detection; suited for simple analog voltage position feedback | Select when system lacks I²C resources but requires high-precision analog ratiometric output |
| Melexis MLX90393ELD-ABA-000-TU | 3-axis XYZ sensing; I²C + SPI; ±50 mT range; 16-bit resolution; 8-pin TSSOP (3×3 mm) | Supports multi-axis field vector analysis and higher dynamic range but consumes 120 µA in active mode | Select when triaxial field mapping or higher full-scale range is required despite larger footprint and higher power |
Compared with A1324LLHLT-T and MLX90393ELD-ABA-000-TU, SI7210-B-12-IM2R uniquely balances ultra-low sleep current (50 nA), compact DFN-8 size, and integrated tamper-aware digital alert-making it optimal for battery-powered, space-constrained, security-critical position sensing.
Availability
SI7210-B-12-IM2R is available at Aetrix Electronics and suitable for industrial control knobs, utility meter tamper monitoring, and motor speed sensing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI7210-B-12-IM2R 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 low-power, mixed-signal ICs for IoT, industrial, and automotive applications, with leadership in timing, wireless, and sensor technologies.
The Si7210 family was designed specifically for high-accuracy, low-power magnetic position sensing in space- and energy-constrained systems-integrating Hall sensing, DSP, temperature compensation, and I²C interface into a single die.
FAQ
What is the I²C address of the SI7210-B-12-IM2R and how is it set?
The SI7210-B-12-IM2R has a fixed 7-bit I²C address of 0x32 (0110010b), factory-programmed during manufacturing and not user-modifiable. This address is one of four possible values (0x30–0x33) assigned by part number variant. Communication follows standard Fast-mode I²C protocol up to 400 kHz, with SCL/SDA requiring external pull-up resistors per bus loading requirements. The SI7210-B-12-IM2R responds only to this address and ignores traffic directed to other addresses on the same bus.
Does the SI7210-B-12-IM2R support both magnetic field and temperature measurement simultaneously?
Yes, the SI7210-B-12-IM2R concurrently measures magnetic field strength and die temperature via shared I²C interface. Magnetic field data (13-bit signed) is read from registers 0xC1–0xC2, while temperature data (12-bit signed) is accessed by setting dspsigsel=0x01 in register 0xC4, then reading the same registers. Temperature accuracy is ±1°C over –10°C to +85°C (SOT23-5) or ±4°C (DFN-8), with gain/offset correction applied using OTP coefficients. Both measurements use the same ADC and DSP pipeline but are time-multiplexed.
What is the function of the ALERT pin on the SI7210-B-12-IM2R and how is it configured?
The ALERT pin on the SI7210-B-12-IM2R is a factory-configured push-pull digital output that asserts high or low when the measured magnetic field crosses user-defined operate (BOP) and release (BRP) thresholds. Configuration is performed via I²C registers sw_op (center point), sw_hyst (hysteresis), and sw_fieldpolsel (unipolar/omnipolar mode). Unlike open-drain variants, this pin requires no external pull-up and drives actively to VDD or GND. Thresholds are retained in sleep mode if Usestore=1, enabling wake-on-event functionality critical for battery-powered applications.
How does the SI7210-B-12-IM2R achieve temperature compensation for magnetic field measurements?
The SI7210-B-12-IM2R applies real-time temperature compensation using factory-trimmed OTP coefficients (a0–a5) and a DSP algorithm that models neodymium magnet drift at –0.12%/°C. The compensation is applied digitally within the signal path before ADC output formatting, correcting gain and offset errors across –40°C to +125°C. This eliminates the need for external temperature sensors or host-side correction algorithms. The SI7210-B-12-IM2R's sensitivity drift remains <±5% over 0–70°C, ensuring stable trip points in thermal-varying environments like motor enclosures or outdoor utility meters.
Is the SI7210-B-12-IM2R suitable for automotive applications?
The SI7210-B-12-IM2R is rated for operation from –40°C to +125°C and meets AEC-Q200 stress test requirements for temperature cycling, humidity, and ESD (2 kV HBM), but it is not AEC-Q100 qualified and is marked "Not Recommended for New Designs" in Silicon Labs' documentation. Its 125°C max junction temperature and robust DFN package support under-hood industrial applications, yet automotive OEMs should verify qualification status and consult Silicon Labs' latest automotive roadmap before integration. For new automotive designs, Silicon Labs recommends the Si7211 or Si7220 families instead.
SI7210-B-12-IM2R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- 8-XFDFN
- Packaging:
- Tape & Reel (TR)
- 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-12-IM2R FAQ
1.How can I place an order for SI7210-B-12-IM2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7210-B-12-IM2R 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-12-IM2R reliable?
The price and inventory of SI7210-B-12-IM2R 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-12-IM2R is usually 5 days.
3.What payment methods are accepted for SI7210-B-12-IM2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7210-B-12-IM2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7210-B-12-IM2R?
SI7210-B-12-IM2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7210-B-12-IM2R 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-12-IM2R?
For technical support, including SI7210-B-12-IM2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7210-B-12-IM2R requirements.
6.How does Aetrix verify that SI7210-B-12-IM2R is sourced from the original manufacturer or authorized distributors?
All SI7210-B-12-IM2R 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-12-IM2R meets industry standards.
7.What is the process for return or replacement of SI7210-B-12-IM2R?
All SI7210-B-12-IM2R units undergo pre-shipment inspection (PSI). If there is an issue with SI7210-B-12-IM2R, 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-12-IM2R part is unused and in its original packaging.
Return procedure for SI7210-B-12-IM2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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