Si7021 Temperature and Humidity Sensor

SKU: TOY0054 Brand: DFRobot

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This product has been retired. It is no longer available, but this page has been kept for reference.

Introduction

The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis, and excellent long term stability. The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required. The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible drop-in upgrade for existing RH/temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates.

The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature, in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.

APPLICATIONS

  • HVAC/R
  • Thermostats/humidistats
  • Indoor weather stations
  • Automotive climate control and defogging

Specification

  • Operating Voltage: 1.9 - 3.6V (recommend 3.3V)
  • Standby Current: 60nA
  • Temperature Range: -40 - 85℃ (recommend -10 - 60℃)
  • Temperature Accuracy: ±0.4℃ (-10 - 85℃)
  • Humidity Range: 0-100%RH (recommend 20% - 80%RH)
  • Humidity Accuracy: ±3%RH (0-80%RH)
  • Temperature Conversion Time: 7ms
  • Humidity Conversion Time: 17ms (RH measurement will automatically initiate a temperature measurement)
  • Interface: I2C, Gadgeteer and soldering pad with 2.5mm spacing
  • Size: 32X32mm
  • Mounting hole: inner diameter is 3.2mm, spacing is 25mm

Documents

 SHIPPING LIST
  • Si7021 Temperature and Humidity Sensor x1
  • Gadgeteer IDC10 Cable x1

This product is listed in:

Retired

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

  • $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
  • $6+ for Standard Post (typically 6+ business days, tracked)
  • $10+ for Express Post (typically 2+ business days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11+ for Pack and Track (3+ days, tracked)
  • $16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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