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STSC1 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

Part # STSC1
Description  High Accuracy Digital Temperature Sensor IC
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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www.sensirion.com
Version 1 – May 2014
6/13
16-bit ID
xxxx'xxxx’xx 00’0111
bits 5 to 0: STSC1-specific product code
bits 15 to 6: unspecified information
Table 11 Structure of the 16-bit ID. Bits 15:6 of the ID contain
unspecified information (marked as “x”), which may vary from
sensor to sensor, while bits 5:0 contain the STSC1-specific
product code.
6.8 Checksum Calculation
The 8-bit CRC checksum transmitted after each data word
is generated by a CRC algorithm with the properties
displayed in Table 12. The CRC covers the contents of the
two previously transmitted data bytes.
Property
Value
Name
CRC-8
Width
8 bits
Polynomial
0x31 (x8 + x5 + x4 + 1)
Initialization
0xFF
Reflect input
False
Reflect output
False
Final XOR
0x00
Examples
CRC (0x00) = 0xAC
CRC (0xBEEF) = 0x92
Table 12 STSC1
I2C CRC properties.
6.9 Conversion of Signal Output
Measurement data is always transferred as 16-bit values.
These values are already linearized by the STSC1.
Temperature values can be calculated with the formula
given below.
Temperature conversion formula (result in °C):
16
T
2
S
175
45
T
ST denotes the raw sensor output (as decimal value) for
temperature.
6.10 Communication Data Sequences
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
S
P
STSC1 measuring
1 0 0 1 0 1 0 0
0 1 1 1 1 1 0 0
1 0 1 0 0 0 1 0
I2C address + write
Measurement command MSB
Measurement command LSB
Measurement in progress
29 30 31 32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47 48 49
S
P STSC1 measuring
STSC1 in idle
state
S
1 0 0 1 0 1 0 1
1 0 0 1 0 1 0 1
repeated I2C address + read
while meas. is in prog. (polling)
measurement cont’d
measurement
completed
I2C address + read
29 30 31 32 33 34 35 36 37 38
S
STSC1 measuring,
SCL line pulled low
1 0 0 1 0 1 0 1
I2C address + read
while meas. is in progress
measurement continued
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
P
0 1 1 0 0 1 0 0
1 0 0 0 1 0 1 1
1 1 0 0 0 1 1 1
Temperature MSB
Temperature LSB
Temperature CRC checksum
Figure 5 Communication sequence for starting a measurement and reading measurement results displaying both clock stretching options.
The numerical example corresponds to a measurement command with clock stretching enabled. The physical values of the transmitted
measurement result is 23.7 °C. Clear blocks are controlled by the microcontroller, grey blocks by the STSC1.
clock stretching
disabled
clock
stretching enabled


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