Silicon Labs SI7210-B-13-IM2

Overview

SI7210-B-13-IM2 from Silicon Labs is a programmable I²C Hall effect magnetic position and temperature sensor in an 8-pin DFN package. It integrates a chopper-stabilized Hall element, 13-bit ADC, digital signal processing for temperature/offset compensation, ±20 mT full-scale range, and ±1°C temperature measurement accuracy. It delivers precise linear magnetic field sensing for industrial position feedback and tamper detection.

For engineers reviewing the SI7210-B-13-IM2 datasheet, SI7210-B-13-IM2 pinout, SI7210-B-13-IM2 application, or SI7210-B-13-IM2 equivalent, key selection considerations include its factory-configured 20 mT range, DFN-8 package with thermal resistance θ_JA = 107.6°C/W, I²C address 0x32, open-drain ALERT output, and 50 nA sleep current - critical for battery-powered sensing nodes and security systems.

Technical Context

The SI7210-B-13-IM2 implements a fully integrated signal chain: chopper-stabilized Hall sensing element → low-noise analog amplifier → 13-bit SAR ADC → on-chip DSP for real-time temperature and mechanical stress compensation. Its digital output path supports configurable burst sampling (1–4096 samples) with FIR or IIR filtering to reduce RMS noise to 30 µT (typ.) on the 20 mT scale.

It operates over 1.7–5.5 V supply and −40°C to +125°C ambient, with factory-programmed I²C address 0x32, 20 mT full-scale range, and open-drain ALERT output. The device wakes from 50 nA sleep mode in 1 ms and achieves up to 20 kHz output bandwidth in continuous idle mode.

Key Specifications

Pinout & Package

SI7210-B-13-IM2 uses an industry-standard 1.4 mm × 1.6 mm, 0.5 mm pitch, 8-pin DFN package (exposed thermal pad). Thermal resistance is θ_JA = 107.6°C/W and θ_JB = 42.6°C/W on a JEDEC 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1324LLHLT-T, SI7210-B-13-IM2 adds digital configurability, temperature sensing, and ultra-low-power sleep - essential for smart, battery-operated endpoints. Compared with MLX90393ELD-ABA-000-TU, SI7210-B-13-IM2 offers smaller size, lower sleep current, and simpler firmware integration at the cost of single-axis operation.

Availability

SI7210-B-13-IM2 is available at Aetrix Electronics and suitable for industrial position sensing, utility meter anti-tampering, and consumer rotary encoder applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SI7210-B-13-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 family was designed specifically for high-accuracy, low-power magnetic position and temperature sensing in space-constrained, battery-operated systems - emphasizing robustness against thermal drift and mechanical stress.

FAQ

What is the factory-configured I²C address for SI7210-B-13-IM2?

The SI7210-B-13-IM2 has a factory-programmed I²C address of 0x32 (binary 0110010). This is fixed and cannot be changed in-circuit. Four unique addresses (0x30–0x33) are available across the Si7210 family, allowing multiple devices on the same bus without address conflict - a feature confirmed in the official Silicon Labs datasheet Rev. 1.4, Section 3.

Does SI7210-B-13-IM2 support both magnetic field and temperature measurement simultaneously?

Yes, SI7210-B-13-IM2 supports concurrent magnetic field and temperature measurement. Magnetic field data is read from registers 0xC1–0xC2 (13-bit signed value), while temperature data is accessed by setting dspsigsel = 0x01 in register 0xC4, then reading the same registers. Temperature accuracy is ±1°C for the SOT23-5 variant and ±4°C for the DFN-8 variant (SI7210-B-13-IM2), per Table 1.7 in the datasheet.

What is the meaning of "Not Recommended for New Designs" in the SI7210-B-13-IM2 datasheet?

"Not Recommended for New Designs" (NRND) indicates Silicon Labs no longer recommends SI7210-B-13-IM2 for newly initiated projects due to newer alternatives (e.g., Si7211). However, SI7210-B-13-IM2 remains fully supported with guaranteed supply, full documentation, and unchanged specifications. Aetrix Electronics maintains active inventory and lifecycle coordination for legacy design continuity.

Can SI7210-B-13-IM2 operate with a 1.8 V supply voltage?

Yes, SI7210-B-13-IM2 operates across 1.71 V to 5.5 V. At 1.8 V, typical active current is 3.5 mA (Table 1.2), and I²C logic levels remain valid: VIH ≥ 1.26 V (0.7 × 1.8 V) and VIL ≤ 0.54 V (0.3 × 1.8 V). All specifications - including 50 nA sleep current and 20 kHz bandwidth - are guaranteed within this range per the Recommended Operating Conditions table.

How is the ALERT pin configured on SI7210-B-13-IM2?

The ALERT pin on SI7210-B-13-IM2 is factory-configured as an open-drain output. Its behavior is controlled via I²C registers: sw_low4field sets logic sense (low = strong field), sw_op defines the magnetic trip point (e.g., 0.08–19.2 mT on 20 mT scale), and sw_hyst sets hysteresis (±0.04–8.96 mT). Tamper detection is enabled via sw_tamper, causing ALERT to assert at zero-field level when field exceeds threshold.