DESCRIPTION AND OPERATION
FUNCTIONAL OPERATION
2 - 2
WBPEEUI110506A0
Cell and Characterization Board Assembly
Type PTSP pressure transmitters use an electrically isolated
piezo-resistive monocrystal silicon chip as the sensing device.
A Wheatstone bridge is implanted on the silicon chip in the
deflecting areas of the sensor.
The pressure transfers through the fill fluid (silicone oil or flu-
orinated oil) that is between the isolating diaphragm and the
silicon chip (Fig.
). The resistance of the bridge varies as a
function of the pressure. A regulated current, applied to the
bridge, results in an unbalanced voltage across the bridge.
This voltage is proportional to the applied pressure.
The cell and characterization board are a matched set and may
not be separated. For more information on the characteriza-
tion board, refer to
Electronics Assembly
Figure
shows the Type PTSP pressure transmitter elec-
tronics in block diagram form. All calibration, configuration,
and compensation data are stored in both the main and char-
acterization boards. The output of the cell goes into a custom
analog to digital converter on the LSI smart chip via the char-
acterization board. The microcontroller requests the digital
outputs of the custom analog to digital converter. It uses these
Figure 2-2. Cell and Characterization Board Assembly
C H A R A C T E R IZ AT IO N
B O A R D
P R E S S U R E
S IL IC O N
C H IP
IS O L AT IN G
D IA P H R A G M
F IL L F L U ID
T 02 19 8 A
Содержание platinum standard PTSP Series
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