Electronic Components Datasheet Search
Selected language     English  ▼


1-100645-01 Datasheet(PDF) 9 Page - Sensitron

Part No. 1-100645-01
Description  Humidity and Temperature Sensor
Download  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  SENSITRON [Sensitron]
Homepage  http://www.sensitron.com
Logo 

 
 9 page
background image
Datasheet SHT21
www.sensirion.com
Version 1.0 – January 2010
9/12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
S 1 0 0 0 0 0 0 0
1 1 1 0 0 1 1 1
I2C address + write
Read Register
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
S 1 0 0 0 0 0 0 1
0 0 0 0 0 0 1 0
I2C address + read
Register content
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53 54
S 1 0 0 0 0 0 0 0
1 1 1 0 0 1 1 0
I2C address + write
Write Register
55
56
57
58
59
60
61
62
63
0 0 0 0 0 0 1 1
P
Register content to be written
Figure 16 Read and write register sequence – grey blocks are
controlled by SHT2x. In this example, the resolution is set to 8bit
/ 12bit.
5.7
CRC Checksum
For implementing CRC8 checksum please refer to
Wikipedia (http://en.wikipedia.org/wiki/crc8).
5.8
Serial Number
SHT21 provides an electronic identification code. For
instructions on how to read the identification code please
refer to the Application Note “Electronic Identification
Code” – to be downloaded from the web page
www.sensirion.com/SHT21.
6 Conversion of Signal Output
Default resolution is set to 12 bit relative humidity and 14
bit temperature reading. Measured data are transferred in
two byte packages, i.e. in frames of 8 bit length where the
most significant bit (MSB) is transferred first (left aligned).
Each byte is followed by an acknowledge bit. The two
status bits, the last bits of LSB, must be set to ‘0’ before
calculating physical values. In the example of Figure 13
and Figure 14, the transferred 16 bit relative humidity data
is ‘0110’0011’0101’0000’ = 25424.
6.1
Relative Humidity Conversion
With the relative humidity signal output SRH the relative
humidity RH is obtained by the following formula (result in
%RH), no matter which resolution is chosen:
16
RH
2
S
125
6
RH
In the example given in Figure 13 and Figure 14 the
relative humidity results to be 42.5%RH.
The physical value RH given above corresponds to the
relative humidity above liquid water according to World
Meteorological Organization (WMO). For relative humidity
above ice RHi the values need to be transformed from
relative humidity above water RHw at temperature t. The
equation is given in the following, compare also
Application Note “Introduction to Humidity:
t
λ
t
β
t
λ
t
β
RH
RH
i
i
w
w
w
i
exp
exp
Units are %RH for relative humidity and °C for
temperature. The corresponding coefficients are defined
as follows: βw = 17.62, λw = 243.12°C, βi = 22.46, λi =
272.62°C.
6.2
Temperature Conversion
The temperature T is calculated by inserting temperature
signal output ST into the following formula (result in °C), no
matter which resolution is chosen:
16
T
2
S
175.72
46.85
T
7 Environmental Stability
The SHT2x sensor series were tested according to AEC-
Q100
Rev.
F
qualification
test
method.
Sensor
specifications are tested to prevail under the AEC-Q100
temperature grade 2 test conditions listed in Table 917.
Sensor performance under other test conditions cannot be
guaranteed and is not part of the sensor specifications.
Especially, no guarantee can be given for sensor
performance in the field or for customer’s specific
application.
Environment Standard
Results18
HTSL
125°C, 1000 hours
Within
specifications
TC
-50°C - 125°C, 1000 cycles
Acc. JESD22-A104-C
Within
specifications
UHST
130°C / 85%RH, 96h
Within
specifications
THU
85°C / 85%RH, 1000h
Within
specifications
ESD immunity MIL STD 883E, method 3015
(Human Body Model at ±2kV)
Qualified
Latch-up
force current of ±100mA with
Tamb = 80°C, acc. JEDEC 17
Qualified
Table 9: Qualification tests: HTSL = High Temperature Storage
Lifetime, TC = Temperature Cycles, UHST = Unbiased Highly
accelerated Stress Test, THU = Temperature Humidity
Unbiased.
17 Sensor operation temperature range is -40 to 105°C according to AEC-Q100
temperature grade 2.
18 According to accuracy and long term drift specification given on Page 2.




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download




Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl