Silicon Labs SI7005EVB-UDP-M3L1

Overview

SI7005EVB-UDP-M3L1 from Silicon Laboratories is an evaluation board for 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 (±1 °C max @ 0–70 °C) measurements, featuring factory-calibrated sensing elements, integrated heater, and 4×4 mm QFN-24 package with optional hydrophobic/oleophobic protective cover. It supports rapid prototyping in HVAC/R, thermostats, and asset tracking systems.

For engineers reviewing the SI7005EVB-UDP-M3L1 datasheet, SI7005EVB-UDP-M3L1 pinout, SI7005EVB-UDP-M3L1 application, or SI7005EVB-UDP-M3L1 equivalent, this board enables immediate I²C interface validation, dew-point calculation verification, reflow-safe sensor characterization, and long-term stability assessment under controlled humidity conditions - all without custom PCB design.

Technical Context

The SI7005EVB-UDP-M3L1 implements the Si7005 sensor IC in a 24-pin QFN package with exposed thermal pad, configured for standard I²C operation at up to 400 kHz using 7-bit address 0x40. It includes on-board 0.1 µF and 4.7 µF decoupling capacitors, 10 kΩ pull-up resistors on SDA/SCL, and direct access to CS, CEXT, VDD, GND, SDA, and SCL pins per the Si7005 functional block diagram.

This evaluation board supports both normal (35 ms) and fast (18–21 ms) conversion modes, integrates the Si7005's on-chip heater for self-test and condensation recovery, and accommodates the optional factory-installed PTFE cover rated IP67 with operating range –40 °C to +125 °C - enabling validation across industrial and automotive climate control use cases.

Key Specifications

Availability

SI7005EVB-UDP-M3L1 is available at Aetrix Electronics and suitable for HVAC/R system validation, thermostat firmware development, respiratory therapy device qualification, and data center micro-environment monitoring requiring stable component supply and repeatable sensor characterization.

Supply support for SI7005EVB-UDP-M3L1 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 sensing, timing, and connectivity solutions for embedded systems, with core expertise in mixed-signal IC design and sensor signal processing.

The Si7005 product line was designed to deliver factory-calibrated, monolithic CMOS humidity and temperature sensing for applications demanding long-term stability, low power, and reflow-safe assembly - including industrial controls, consumer appliances, and medical devices.

FAQ

What is the primary function of the SI7005EVB-UDP-M3L1 evaluation board?

The SI7005EVB-UDP-M3L1 evaluation board is a hardware platform built around the Si7005 digital I²C humidity and temperature sensor IC. Its purpose is to accelerate design-in by providing verified circuitry, accessible test points, and documented interface behavior - allowing engineers to validate RH accuracy (±4.5% RH), temperature response (±1 °C), I²C communication, and heater functionality without developing custom hardware. The SI7005EVB-UDP-M3L1 directly supports firmware integration and environmental test correlation.

Does the SI7005EVB-UDP-M3L1 include the Si7005 sensor with protective cover?

Yes, the SI7005EVB-UDP-M3L1 incorporates the Si7005 sensor IC with the optional factory-installed hydrophobic/oleophobic PTFE protective cover. This cover is rated IP67, withstands reflow up to 260 °C, and operates from –40 °C to +125 °C - enabling reliable validation in dusty, humid, or particulate-prone environments without compromising vapor permeability. The SI7005EVB-UDP-M3L1 thus reflects production-ready mechanical and environmental configuration.

Can the SI7005EVB-UDP-M3L1 be used for dew-point calculation verification?

Yes, the SI7005EVB-UDP-M3L1 supports dew-point calculation verification because it delivers simultaneous, time-aligned relative humidity and temperature measurements from the same monolithic die. With RH accuracy ±4.5% RH (0–80% RH) and temperature accuracy ±1 °C (0–70 °C), the SI7005EVB-UDP-M3L1 provides the calibrated inputs required to compute dew point using industry-standard Magnus or Arden Buck equations - critical for HVAC/R and de-fogging algorithm validation.

What are the key I²C interface requirements for communicating with the SI7005EVB-UDP-M3L1?

The SI7005EVB-UDP-M3L1 uses the Si7005's fixed 7-bit I²C address 0x40 and supports standard-mode (100 kHz) and fast-mode (400 kHz) operation. It includes onboard 10 kΩ pull-up resistors on SDA and SCL, requires no external level-shifting for 3.3 V systems, and complies with I²C timing specifications including tSKH ≥ 0.6 µs and tSKL ≥ 1.3 µs. The SI7005EVB-UDP-M3L1 also exposes the CS pin for power-down control and CEXT for external capacitance tuning.

How does the on-board heater in the SI7005EVB-UDP-M3L1 support sensor validation?

The SI7005EVB-UDP-M3L1 leverages the Si7005's integrated heater (24–31 mA at 3.3 V) to enable active sensor diagnostics, including condensation recovery testing, self-heating offset verification, and accelerated bake/hydrate cycle validation per Silicon Labs Application Note AN619. This allows engineers to confirm RH drift correction, assess long-term stability under thermal stress, and validate dew-point accuracy - all using the SI7005EVB-UDP-M3L1 without additional instrumentation.