SENSIRION SHTV3 Flagship RH T Sensor Generation Installation Guide

SENSIRION SHTV3 Flagship RH T Sensor Generation

Product Information

Specifications

Product Usage Instructions

Step 1: Boarding the new flagship RH/T sensor generation
The SHTV4 is the new flagship RH/T sensor. To use it, follow these steps:

1. Ensure that the supply voltage is within the specified range (1.08V to 3.6V).
2. Connect the SHTV4 to the appropriate power supply according to the electrical characteristics provided.
3. Ensure that the sensor is properly connected to the application circuit design.

Step 2: Performance Comparison
Compare the humidity and temperature specifications of the SHTV3 and SHTV4:

Step 3: Electrical Characteristics
Take note of the key electrical specifications of the SHTV3 and SHTV4:

Step 4: Timing Specifications
Consider the timing specifications of the SHTV3 and SHTV4:

FAQ

• Q: What is the purpose of this document?
  A: This document provides a guideline for replacing SHTV3 with sensors from the SHT4x family, specifically the SHTV4, and highlights important differences to consider in the design-in processes.

• Q: What are the important differences in humidity and temperature specifications between SHTV3 and SHTV4?
  A: The SHTV4 has a relative humidity accuracy of typ. 63% and a temperature accuracy of typ. 2, while the SHTV3 does not have specified values for these parameters.

• Q: What is the supply voltage range for both SHTV3 and SHTV4?
  A: The supply voltage range for SHTV3 is min. 1.62V to max. 3.6V, while for SHTV4 it is min. 1.08V to max. 3.6V.

Boarding the new flagship RH/T sensor generation

Features

• Improved accuracy, power consumption, and robustness
• Powerful internal heater for self-decontamination
• Superior versatility and technology from two decades of sensor development
• Relative humidity accuracy: up to ±1.8 %RH
• Temperature accuracy: up to ±0.2 °C
• Supply voltage: 1.08 V … 3.6 V
• Average current: 0.4 µA (at meas. rate 1 Hz)
• Idle current: 80 nA
• Fully functional in a condensing environment

General Description

Once introduced as an extremely high-volume digital humidity (RH) and temperature (T) sensor, the SHTV3 enabled outstanding sensing performance in a small package at attractive price levels for several years. Sensirion now proudly recommends its successor from the SHT4x family, the SHTV4, which profits from about two decades of RH/T sensor development. Reserved exclusively for high-volume applications, the SHTV4 features a significantly reduced power consumption and footprint in comparison to the SHTV3.

Important Changes

robustness

Purpose
This document aims to provide a high-level guideline to replace SHTV3 with sensors from the SHT4x family, in particular the SHTV4, and outlines important differences to be considered in design-in processes.

Performance Comparison

Relative Humidity and Temperature

Relative humidity
RH accuracy1| Typ.| ±2| ±1.8| %RH
High repeatability2| –| 0.1| 0.08| %RH
Resolution3| –| 0.01| 0.01| %RH
Hysteresis| –| ±1| ±1| %RH
Specified range4| extended5| 0 – 100| 0 – 100| %RH
Response time6| t 63%| 8| 4| s
Long-term drift7| Typ.| < 0.25| < 0.25| %RH/y
Condensation behavior| Droplet formation| Slight signal drop| No signal drop| –
Temperature
T Accuracy1| Typ.| ±0.2| ±0.2| °C
High repeatability2| –| 0.1| 0.04| °C
Resolution3| –| 0.01| 0.01| °C
Specified range4| –| −40 – +125| −40 – +125| °C
Response time8| t 63%| < 5 – 30| 2| s
Long-term drift9| Typ.| < 0.02| < 0.02| °C/y

Table 1. Humidity and temperature specifications of the SHTV3 and SHTV4, where bold values highlight important differences. For further details, kindly refer to the SHTV3 and SHTV4/4x datasheets.

1. For definition of typ. accuracy, please refer to the document “Sensirion Humidity Sensor Specification Statement”.

2. The stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurement values at constant conditions and is a measure for the noise on the physical sensor output. Different repeatability commands are listed in Table 5.

3. Resolution of A/D converter.

4. Specified range refers to the range for which the humidity or temperature sensor specification is guaranteed.

5. For details about the recommended humidity and temperature operating range, please refer to the SHTV4 and SHT4x Datasheet.

6. Time for achieving 63% of a humidity step function, valid at 25°C and 1 m/s airflow. Humidity response time in the application depends on the design of the sensor.

7. Typical value for operation in normal RH/T operating range. Max. value is < 0.5 %RH/y. The value may be higher in environments with vaporized solvents, out-gassing
   tapes, adhesives, packaging materials, etc. For more details, please refer to Handling Instructions.

8. Temperature response time depends on the heat conductivity of the sensor substrate and design-in of the sensor in the application.

9. Max. value is < 0.04°C/y.

Electrical Characteristics

Parameter| Symbol| Conditions| SHTV3| SHTV4| Units
---|---|---|---|---|---
Min.| Typ.| Max.| Min.| Typ.| Max.
Supply voltage| V DD|  | 1.62| 3.3| 3.6| 1.08| 3.3| 3.6| V
Power-up/down level| V POR| Static power supply| 1.28| 1.4| 1.55| 0.6| –| 1.08| V

Supply current (heater not activated)

| ****

I DD

| Sleep/Idle| –| 0.3| 0.6| –| 0.08| –| µA
Meas.| –| 430| 900| –| 320| –| µA
Average| –| 4.9| –| –| 0.4 (low)

2.2 (high)

| –| µA
Power consumption| –| Average| 16.2| –| –| –| 0.5 (low)

2.6 (high)

| –| µW
Low level input voltage| V IL| –| –| –| 0.42 **V DD| 0| –| 0.3**

V DD

| V
High level input voltage| V IH| –| 0.7 V DD| –| –| 0.7

V DD

| –| V DD| V
Application circuit design| –| –| Identical, for details see SHTV3 or SHTV4/4x datasheet| –

Table 2. Key electrical specifications of the SHTV3 and SHTV4, where bold values highlight important differences. For further details, kindly refer to the SHTV3 and SHTV4/4x datasheets.

Timing Specifications

Parameter| Symbol| Conditions| SHTV3| SHT4x| Units
---|---|---|---|---|---
Min| Typ.| Max| Min| Typ.| Max

Power-up time

| ****

t PU

| After hard reset,

V DD ≥ V POR

| ****

–

| ****

0.18

| ****

0.24

| ****

–

| ****

–

| ****

1

| ****

ms

Soft reset time| t SR| After soft reset| –| 0.18| 0.24| –| –| 1| ms
Measurement duration| t Meas| Medium repeatability| –| 10.8| 12.1| –| 3.7| 4.5| ms
Heater-on duration| t Heater|  | –| –| –| 0.1| –| 1| s

Table 3. Key timing specifications of the SHTV3 and SHT4x, where bold values highlight important differences. For further details, kindly refer to the SHTV3 and SHTV4/4x datasheets.

Flagship SHT4x/SHTV4 Feature: Built-In Heater

The SHTV4 sensor incorporates a powerful on-chip heater, which can be used for self-decontamination, e.g. in environments with solvents present, and periodical creep compensation in prolonged application in the highest humidity. It provides an over-temperature of about 60 °C and can be switched on by the command specified in Table 5, after which the heater will run for 1 second. After 1 second, a temperature and humidity measurement is started and the heater will be automatically turned off after the measurement is finished. This safety feature prevents permanent turn-on of the heater. There is no dedicated command to turn off the heater. If higher temperatures than achievable by heating for 1 second are desired, consecutive heating commands need to be sent to the sensor.

Package Design Differences

The SHTV4 comes in a new open-cavity dual flat no-lead (DFN) package. Similar to the SHTV3, the humidity sensor opening is centred on the top side of the SHTV4 package (see Figure 1,2). The bottom side of both DFN packages exposes metallic contacts, which are Ni/Pd/Au coated, while the side walls of the contacts are bare copper.

Table 4. Key package differences between the SHTV3 and SHTV4. For further details, kindly refer to the SHTV3 and SHTV4/4x datasheets.

Figure 1. Dimensional drawing of the SHTV3 (units mm).

Figure 2. Dimensional drawing including package tolerances (units mm) of the SHT4x, which is identical to the SHTV4 in terms of packaging.

Communication Compatibility

Both chips feature the I2C communication protocol. In addition, the SHTV4 features different measurement options for different precision needs and a heater option, as detailed in Table 5 and Section 3.

Table 5. Short overview of I2C commands for the SHTV4.

For further details on the I2C communication, such as general protocol description, data types and lengths, and checksum calculation, kindly refer to the SHTV4/4x datasheet.

Quality and Material Contents

Qualification of the SHTV3 and SHTV4 is performed based on the JEDEC JESD47 qualification test method. While both devices are fully RoHS and REACH compliant, the SHTV4 is also WEEE compliant.

Further Information

This transition guide aims to provide an overview of the key differences between the SHTV3 and the SHTV4, yet it might not be fully inclusive. For further reading on the SHTV4 specifications, communication, operation, and application, please consult the dedicated SHTV3, SHTV4, and SHT4x documents provided on the Sensirion webpage www.sensirion.com. In case you require specific details, or would like to request assistance in transitioning from the SHTV3 to the SHTV4 or any other Sensirion product, please consult us directly at www.sensirion.com/en/about-us/contact/.

Revision History

Important Notices

Warning, Personal Injury
Do not use this product as a safety or emergency stop device or in any other application where failure of the product could result in personal injury. Do not use this product for applications other than its intended and authorized use. Before installing, handling, using or servicing this product, please consult the datasheet and application notes. Failure to comply with these instructions could result in death or serious injury.

If the Buyer shall purchase or use SENSIRION products for any unintended or unauthorized application, the Buyer shall defend, indemnify and hold harmless SENSIRION and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if SENSIRION shall be allegedly negligent concerning the design or the manufacture of the product.

ESD Precautions
The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage and/or degradation, take customary and statutory ESD precautions when handling this product.
See application note “ESD, Latchup and EMC” for more information.

Warranty

SENSIRION warrants solely to the original purchaser of this product for 12 months (one year) from the date of delivery that this product shall be of the quality, material and workmanship defined in SENSIRION’s published specifications of the product. Within such period, if proven to be defective, SENSIRION shall repair and/or replace this product, in SENSIRION’s discretion, free of charge to the Buyer, provided that:

• notice in writing describing the defects shall be given to SENSIRION within fourteen (14) days after their appearance;
• such defects shall be found, to SENSIRION’s reasonable satisfaction, to have arisen from SENSIRION’s faulty design, material, or workmanship;
• the defective product shall be returned to SENSIRION’s factory at the Buyer’s expense; and
• the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period.

This warranty does not apply to any equipment that has not been installed and used within the specifications recommended by SENSIRION for the intended and proper use of the equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN, SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS OR IMPLIED, TO THE PRODUCT. ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.

SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use of the goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not under the technical specifications. SENSIRION does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. All operating parameters, including without limitation recommended parameters, must be validated for each customer’s applications by the customer’s technical experts. Recommended parameters can and do vary in different applications.

SENSIRION reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to improve the reliability, functions and design of this product.
Copyright © 2021, by SENSIRION. CMOSens® is a trademark of Sensirion. All rights reserved

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To find your local representative, please visit www.sensirion.com/distributors.

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