Datasheet SHT21

www.sensirion.com / D1

Version 5 – October 2022

12/14

Figure 23: Second label on reel: For Device Type and Part

Order Number (See Packaging Information on page 2), Delivery

Date (also Date Code) is date of packaging of sensors (DD =

day, MM = month, YYYY = year), CCCC = Sensirion order

number.

8.4

Shipping Package

SHT2x are provided in tape & reel shipment packaging,

sealed into antistatic ESD bags. Standard packaging sizes

are 400, 1500 and 5000 units per reel. For SHT21, each

reel contains 440 mm (55 pockets) header tape and

200 mm (25 pockets) trailer tape.

The drawing of the packaging tapes with sensor

orientation is shown in Figure 24. The reels are provided in

sealed antistatic bags.

Figure 24 Sketch of packaging tape and sensor orientation.

Header tape is to the right and trailer tape to the left on this

sketch.

9 Compatibility to SHT1x / 7x protocol

SHT2x sensors may be run by communicating with the

Sensirion specific communication protocol used for SHT1x

and SHT7x. In case such protocol is applied please refer

to the communication chapter of datasheet SHT1x or

SHT7x. Please note that reserved status bits of user

register must not be changed.

Please understand that with the SHT1x/7x communication

protocol only functions described in respective datasheets

can be used except for the OTP Reload function that is not

set to default on SHT2x. As an alternative to OTP Reload

the soft reset may be used. Please note that even if

SHT1x/7x protocol is applied the timing values of Table 5

and Table 7 in this SHT2x datasheet apply.

For the calculation of physical values the following

equation must be applied:

For relative humidity RH

RES

RH

2

S

125

6

RH



+

−

=

and for temperature T

RES

T

2

S

175.72

46.85

T



+

−

=

RES is the chosen respective resolution, e.g. 12 (12 bit)

for relative humidity and 14 (14 bit) for temperature.

10 Bibliography

[1]

Sensirion, "Handling Instructions for Humidity

Sensors," 2020.

8.0

2.0

4.0

0.3

1.3

R0.3 MAX

R0.25

Ø1.5 MIN

Ø1.5 MIN

3.3

0.25

Device Type:

1-100PPP-NN

Description:

Humidity & Temperature Sensor

SHTxx

Part Order No.

1-100PPP-NN or Customer Number

Date of Delivery: DD.MM.YYYY

Order Code:

46CCCC / 0