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STS21 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part # STS21
Description  Temperature Sensor IC
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Datasheet STS21
www.sensirion.com
Version 2 – December 2011
8/12
5.6
User Register
The content of User Register is described in Table 8.
Please note that reserved bits must not be changed and
default values of respective reserved bits may change
over time without prior notice. Therefore, for any writing to
the User Register, default values of reserved bits must be
read first. Thereafter, the full User Register string is
composed of respective default values of reserved bits
and the remainder of accessible bits optionally with default
or non-default values.
Bit
# Bits
Description / Coding
Default
7, 0
2
Measurement resolution
„00‟
14 bit
„01‟
12 bit
„10‟
13 bit
„11‟
11 bit
„00‟
6
1
Status: End of battery9
„0‟: VDD > 2.25V
„1‟: VDD < 2.25V
„0‟
3, 4, 5
3
Reserved
2
1
Enable on-chip heater
„0‟
1
1
Disable OTP Reload
„1‟
Table 8 User Register. Threshold value for End of Battery
signal may vary by ±0.1V. Reserved bits must not be changed.
“OTP reload” = „0‟ loads default settings after each time a
measurement command is issued.
The end of battery alert is activated when the battery
power falls below 2.25V.
OTP Reload is a safety feature and loads the entire OTP
settings to the register, with the exception of the heater bit,
before every measurement. This feature is disabled per
default and is not recommended for use. Please use Soft
Reset instead – it contains OTP Reload.
An example for I2C communication reading and writing the
User Register is given in Figure 15.
5.7
CRC Checksum
STS21 provides a CRC-8 checksum for error detection.
The polynomial used is x8 + x5 + x4 +1. For more details
and implementation please refer to the application note
“CRC Checksum Calculation for SHT2x”.
5.8
Serial Number
STS21 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.
9
This status bit is updated after each measurement
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18
S 1 0 0 1 0 1 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 1 0 1 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 1 0 1 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 15 Read and write register sequence – grey blocks are
controlled by STS21. In this example, the resolution is set to
12bit.
6 Conversion of Signal Output
Default resolution is set to 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 12 and Figure
13, the transferred 16 bit temperature data is
„0110‟0011‟0101‟0000‟ = 25424.
6.1
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 based on AEC-
Q100 Rev. G qualification test method where applicable.
Sensor specifications are tested to prevail under the AEC-
Q100 temperature grade 2 test conditions listed in Table
910.
10 Temperature range is -40 to 105°C (AEC-Q100 temperature grade 2).


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