Silicon Labs SI7210-B-10-IM2R

Overview

SI7210-B-10-IM2R 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-10-IM2R datasheet, SI7210-B-10-IM2R pinout, SI7210-B-10-IM2R application, or SI7210-B-10-IM2R equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing compliance (400 kHz), calibrated temperature compensation coefficients, and two documented alternative parts with explicit functional and packaging differences.

Technical Context

The SI7210-B-10-IM2R integrates a chopper-stabilized Hall element, low-noise analog amplifier, and digital signal processing engine that applies real-time temperature and offset drift compensation using factory-trimmed OTP coefficients. Its 13-bit signal path supports configurable output bandwidth up to 20 kHz and RMS noise of 30 µT (20 mT range, 25°C, 5 V).

It implements bidirectional I²C communication at up to 400 kHz with four factory-programmed addresses (0x30–0x33), supports digital alert output with user-configurable BOP/BRP thresholds, and retains trip-point settings across sleep cycles when Usestore=1. The device operates from 1.71 V to 5.5 V and achieves <±5% sensitivity drift over 0–70°C.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package (1.6 mm × 1.4 mm × 1.1 mm height), industry-standard footprint compatible with automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall effect magnetic sensor applications.

Compared with A1324LLHLT-T and MLX90393ELD-ABA-000-TU, the SI7210-B-10-IM2R uniquely balances ultra-low sleep current (50 nA), integrated I²C+ALERT dual-output capability, and SOT23-5 compactness-making it optimal for space-constrained, battery-operated position switches where digital configurability and minimal BOM count are critical.

Availability

SI7210-B-10-IM2R is available at Aetrix Electronics and suitable for industrial rotary encoders, smart lock position sensing, and consumer control knobs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SI7210-B-10-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 secure, intelligent wireless and sensing solutions for IoT, industrial, and consumer markets.

The Si7210 family was designed specifically for high-accuracy, low-power magnetic position and temperature sensing in space-constrained, battery-operated end equipment-emphasizing factory-calibrated performance, I²C configurability, and robust operation from −40°C to +125°C.

FAQ

What is the full-scale magnetic range configured for SI7210-B-10-IM2R?

The SI7210-B-10-IM2R is factory-configured for ±20 mT full-scale range, delivering 0.00125 mT/LSB resolution across its 13-bit output. This range is optimized for high-sensitivity applications like small-magnet proximity detection and precision rotary position sensing. The device supports reconfiguration to ±200 mT via I²C register writes using OTP-stored calibration coefficients stored in registers 0x21–0x26.

Does SI7210-B-10-IM2R support temperature measurement, and what is its accuracy?

Yes, SI7210-B-10-IM2R integrates an on-die temperature sensor accessible via I²C register dspsigsel=0x01. Its accuracy is ±1°C over −10°C to +85°C for the SOT23-5 package, as specified in Table 1.7 of the datasheet. This enables simultaneous magnetic and thermal monitoring without external components-critical for compensating magnet temperature drift in industrial position feedback loops.

How does the ALERT pin on SI7210-B-10-IM2R function, and can its behavior be modified?

The ALERT pin on SI7210-B-10-IM2R is a configurable digital output supporting push-pull or open-drain modes. Its assertion logic (high/low on field crossing) and magnetic thresholds (BOP/BRP) are set via I²C registers sw_op and sw_hyst. Omnipolar, unipolar, or latch behavior is selected using sw_fieldpolsel. These settings persist across sleep cycles if Usestore=1, enabling reliable wake-on-event operation in battery-powered systems.

What I²C addresses are supported by SI7210-B-10-IM2R, and how are they selected?

SI7210-B-10-IM2R supports four fixed I²C addresses: 0x30, 0x31, 0x32, and 0x33 (binary 0110000–0110011). The address is factory-programmed and cannot be changed in-circuit. This enables up to four SI7210-B-10-IM2R sensors on a single I²C bus without address collision-ideal for multi-zone position sensing in appliances or industrial panels.

Is SI7210-B-10-IM2R suitable for automotive applications, and what is its operating temperature range?

SI7210-B-10-IM2R is rated for −40°C to +125°C ambient temperature (Table 1.1), meeting extended industrial requirements. However, it is not AEC-Q200 qualified and is marked "Not Recommended for New Designs" in Rev. 1.4 documentation. For automotive use, designers should verify qualification status directly with Silicon Labs and consider newer-generation alternatives. Its core specs-50 nA sleep current, ±20 mT range, and I²C interface-remain technically viable for non-safety-critical cabin sensors if legacy design reuse is required.