Silicon Labs SI7217-B-01-IVR

Overview

SI7217-B-01-IVR from Silicon Labs is a high-sensitivity, low-noise Hall-effect magnetic position sensor in a 5-pin SOT23 package, delivering analog output with 7 kHz sample rate, ±20 mT full-scale range, and ratiometric gain referenced to VDD (2.25–5.5 V). It integrates digital signal processing for temperature/offset drift compensation and supports built-in self-test (BIST) via dedicated BISTb pin. Used in industrial rotary encoders and automotive throttle position sensing where stable analog field output and sleep-mode power efficiency are critical.

For engineers reviewing the SI7217-B-01-IVR datasheet, SI7217-B-01-IVR pinout, SI7217-B-01-IVR application, or SI7217-B-01-IVR equivalent, key selection criteria include its 5-pin SOT23 layout with DIS and BISTb terminals, 50 nA typical sleep current, factory-configured 7 kHz sampling, analog output polarity (increasing field → increasing voltage), and absence of temperature compensation per ordering guide.

Technical Context

The SI7217-B-01-IVR implements a chopper-stabilized Hall element with 13-bit ADC and on-die digital signal processing to correct for thermal drift and mechanical stress effects. Its analog output is ratiometric to VDD, with zero-field output at VDD/2 and linear response across ±20 mT.

It features two configurable control pins: DIS (active-high sleep enable) and OUT2/TAMPERb (tamper/high-field indicator), enabling system-level diagnostics and power management. BIST activation is performed by asserting the BISTb pin low, triggering internal coil excitation with polarity reversal on each activation.

Key Specifications

Pinout & Package

SI7217-B-01-IVR uses a 5-pin SOT23 package (JEDEC MO-193AB), with 1.25 mm max height, 2.90 mm × 2.75 mm body, and 0.95 mm pin pitch. Pin 1 is OUT2/TAMPERb (open-drain tamper alert), Pin 2 is GND, Pin 3 is DIS (active-high sleep control), Pin 4 is VDD, and Pin 5 is OUT1 (analog output).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect magnetic position sensing applications.

Compared with SI7211-B-00-IVR, SI7217-B-01-IVR adds system-level power control and fault detection via DIS and TAMPERb pins; compared with TMAG5170AHQDBVR, it provides direct analog output without MCU dependency but trades off resolution and configurability for lower BOM cost and design simplicity.

Availability

SI7217-B-01-IVR is available at Aetrix Electronics and suitable for industrial rotary encoders, automotive throttle position sensing, consumer camera autofocus actuators, and fluid level detection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SI7217-B-01-IVR 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 sensing, timing, wireless, and security applications, with headquarters in Austin, Texas.

The Si721x family was designed specifically for contactless magnetic position sensing in harsh environments, emphasizing high sensitivity, low noise, and integrated signal conditioning to replace legacy potentiometers and resolver-based systems.

FAQ

What output format does the SI7217-B-01-IVR provide?

The SI7217-B-01-IVR provides analog voltage output ratiometric to VDD, with zero field at VDD/2 and linear response from ~0 V (−20 mT) to ~VDD (+20 mT). It does not support PWM or SENT outputs - those are implemented in other Si721x variants such as SI7212 or SI7213. The analog output is factory-configured for 7 kHz sampling and ±20 mT full-scale range.

Does the SI7217-B-01-IVR include temperature compensation?

No, the SI7217-B-01-IVR does not include factory-applied temperature compensation, as confirmed in the Ordering Guide entry for this part number. While the device incorporates digital signal processing for offset drift correction, the specific temperature compensation feature (e.g., for neodymium or ceramic magnets) is omitted in this variant. Sensitivity drift remains within ±3% over −40 to +125 °C due to inherent architecture, but no magnet-specific thermal modeling is applied.

How is built-in self-test (BIST) activated on the SI7217-B-01-IVR?

Built-in self-test (BIST) on the SI7217-B-01-IVR is activated by driving the OUT2/TAMPERb pin (Pin 1) low. When asserted, the internal test coil energizes, generating a known magnetic field. Each subsequent low assertion flips the coil's polarity. BIST operation is independent of the main OUT1 analog output and does not interrupt ongoing field measurements - the analog output continues updating with real-time data during BIST.

What is the function of the DIS pin on the SI7217-B-01-IVR?

On the SI7217-B-01-IVR, the DIS (Disable) pin (Pin 3) is an active-high input that places the device into ultra-low-power sleep mode when driven high, reducing current consumption to 50 nA typical. Wake-up occurs automatically on the falling edge of DIS, resuming measurement and analog output within 1 ms. This pin enables precise system-level power gating without requiring reinitialization or firmware overhead.

Is the SI7217-B-01-IVR pin-compatible with other Si721x family members?

No, the SI7217-B-01-IVR is not pin-compatible with 3-pin Si721x variants like SI7211-B-00-IVR. It uses a 5-pin SOT23 package with dedicated DIS and OUT2/TAMPERb terminals, whereas 3-pin versions consolidate functionality into VDD, OUT, and GND only. Board redesign is required to substitute SI7217-B-01-IVR for any 3-pin Si721x part due to differing pin count, assignment, and package outline.