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2
I²C - communication
2.1
General
The digital pressure measuring cell is equipped with a digital I²C interface and optionally an analog out-
put.
The communication via the I²C interface is described in the following chapters. This includes the correct
electrical connection, the entire design as an I²C-bus with master, slave and pull-up resistors. Addition-
ally, the digital communication is described to read out the pressure value, as well as other device infor-
mation. Finally the correct interpretation and conversion of the digital value into a decimal pressure- or
temperature value is depicted. Furthermore configuration possibilities of the digital pressure measuring
cell are described by using the corresponding software see chapter 4 "PC software", Page 19.
NOTE!
Additional information can be found in the data sheet 40510100T10Z001K000 and in the I
ification and user manual UM10204 on www.nxp.com.
2.2
Interface connection
2.2.1
Pin assignment
Electrical
connec-
tion
A
out
GND
U
B
SCL
SDA
2.2.2
Cabling
NOTE!
Be careful with cabling over more than a few centimetres.
2
The I
C-bus is not a field-bus and only EMC safe if the interconnections are short or screened by the
surrounding housing of the whole application or a suitable cable.
05
Pins
2
3
4
6
7
2 I²C - communication
24
Braids
YE
BK
RD
WH
BU
2
C-bus spec-
39
JST-plug (Type BM05B-
SRSS-TB)
5
4
3
2
1
7
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