SHT21 SENSIRION, SHT21 Datasheet - Page 11

• Manufacturer Part Number: SHT21
• Description: Humidity/Temperture Sensor
• Manufacturer: SENSIRION

Specifications of SHT21

• Operating Temperature Range: -40°C To +125°C
• No. Of Pins: 6
• Supply Voltage: 3V
• Humidity Sensor Type: Capacitive
• Sensor Case Style: DFN
• Humidity Range: 0% To 100%
• Response Time: 8s
• Accuracy: ± 2%
• Supply Current: 300µA

Datasheet SHT21
Figure 19 Laser marking on SHT21. For details see text.
Reels are also labeled, as displayed in Figure 20 and
Figure 21, and give additional traceability information.
Figure 20: First label on reel: XX = Sensor Type (21 for SHT21),
O = Output mode (D = Digital, P = PWM, S = SDM), NN = Chip
Version, Y = last digit of year, RRR = number of sensors on reel
divided by 10 (200 for 2000 units), TTTTT = Traceability Code.
Figure 21: 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
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 440mm (55 pockets) header tape and
200mm (25 pockets) trailer tape.
The drawing of the packaging tapes with sensor
orientation is shown in Figure 22. The reels are provided in
sealed antistatic bags.
www.sensirion.com
Lot No.:
Quantity:
RoHS:
Lot No.
Device Type:
Description:
Part Order No.
Date of Delivery: DD.MM.YYYY
Order Code:
Shipping Package
XXO-NN-YRRRTTTTT
RRRR
Compliant
1-100PPP-NN
Humidity & Temperature Sensor
SHTxx
1-100PPP-NN or Customer Number
46CCCC / 0
SHT21
D0AC4
Version 1.1 – May 2010
Figure 22 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 with the exception of 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
and for temperature T
RES is the chosen respective resolution, e.g. 12 (12bit) for
relative humidity and 14 (14bit) for temperature.
T
RH
R0.3 MAX



1.3
0.3

46.85
6

125

175.72

4.0
2
S
2.0
RES
RH

3.3
2
S
RES
T
8.0
Ø0.15 MIN
Ø0.15 MIN
R0.25
0.25
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