Silicon Labs SI7005-EVB

Overview

SI7005-EVB from Silicon Laboratories is an evaluation board designed to accelerate development with the Si7005 digital I²C humidity and temperature sensor IC. It provides a ready-to-use platform for validating RH (±4.5% max @ 0–80% RH) and temperature (±0.5 °C typical) measurements, supports factory-calibrated operation, integrates on-chip heater control, and enables rapid prototyping in HVAC/R, thermostats, and respiratory therapy systems.

For engineers reviewing the SI7005-EVB datasheet, SI7005-EVB pinout, SI7005-EVB application, or SI7005-EVB equivalent, this board delivers verified signal integrity for I²C communication at up to 400 kHz, validated power sequencing (2.1–3.6 V), thermal response characterization (1.5 s temp τ₆₃%), and humidity accuracy validation across 0–100% RH - all critical for embedded environmental sensing qualification.

Technical Context

The SI7005-EVB implements the Si7005 sensor in a 24-pin QFN package with exposed thermal pad, featuring dedicated I²C pull-up resistors (10 kΩ), decoupling capacitors (0.1 µF + 4.7 µF), and configurable CS control for low-power mode entry. It supports both standard and fast I²C modes (tCONV = 18–40 ms), includes CEXT terminal for external capacitor-based timing adjustment, and enables heater activation for dew-point calculation and sensor recovery.

Board-level design incorporates JEDEC-compliant land pattern per QFN-24 outline, exposes all functional pins (SDA, SCL, CS, CEXT, VDD, GND), and maintains trace routing to minimize noise coupling into the analog sensor path - essential for achieving ±0.25%RH/yr long-term stability and <0.05 °C/yr temperature drift performance.

Key Specifications

Availability

SI7005-EVB is available at Aetrix Electronics and suitable for HVAC/R commissioning, respiratory therapy device validation, and industrial environmental sensor qualification requiring stable component supply and full technical support.

Supply support for SI7005-EVB 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 Laboratories is a fabless semiconductor company specializing in precision mixed-signal ICs for sensing, timing, and connectivity applications, with deep expertise in MEMS and CMOS sensor integration.

The SI7005-EVB belongs to Silicon Labs' environmental sensor evaluation platform family, engineered to simplify adoption of factory-calibrated, I²C-based humidity and temperature measurement in cost-sensitive, high-reliability embedded systems.

FAQ

What is the primary function of the SI7005-EVB?

The SI7005-EVB is an evaluation board for the Si7005 digital I²C humidity and temperature sensor IC. It provides a fully assembled, tested platform with supporting circuitry - including I²C pull-ups, decoupling capacitors, and heater control interface - to enable rapid characterization, firmware development, and system integration of the Si7005 sensor. The SI7005-EVB itself is not a sensor but a hardware reference for validating the Si7005's performance in real-world conditions.

Does the SI7005-EVB include the Si7005 sensor IC?

Yes, the SI7005-EVB board includes one mounted Si7005 IC in a 24-pin QFN package with exposed thermal pad. The sensor is factory-calibrated and pre-soldered, with all required passive components (0.1 µF and 4.7 µF decoupling caps, 10 kΩ pull-ups) populated. No additional sensor purchase is needed to begin evaluation of the SI7005-EVB.

Can the SI7005-EVB operate from a 3.3 V supply?

Yes, the SI7005-EVB is fully compatible with a 3.3 V supply, which falls within the Si7005's specified operating range of 2.1–3.6 V. At 3.3 V, the board supports full functionality - including RH and temperature conversions, heater activation (24–31 mA), and I²C communication at up to 400 kHz - while maintaining datasheet accuracy specifications (±4.5% RH, ±0.5 °C typical).

How does the SI7005-EVB support heater-based dew-point calculation?

The SI7005-EVB exposes the Si7005's integrated heater via the CEXT pin and provides necessary current-limiting and thermal design to safely activate the heater (24–31 mA at 3.3 V). By measuring temperature rise under controlled heater duty cycle, users can compute dew-point using the SI7005's calibrated temperature and humidity outputs - a capability validated in respiratory therapy and de-fogging applications where condensation prediction is critical.

Is the SI7005-EVB RoHS compliant and suitable for production use?

Yes, the SI7005-EVB conforms to RoHS Directive 2011/65/EU and is built with lead-free solder and compliant passives. While intended primarily for evaluation and design-in, its layout, BOM, and test documentation (including JEDEC-compliant land pattern and thermal pad design) are production-ready references. Engineers may directly reuse its schematic and PCB layout guidance for final product designs incorporating the Si7005 sensor IC.