KMPS-1-64 Manual
12/18
KM 8000 Rev. A
Page 7 of 40
Copyright © 2018 Kulite Semiconductor Products, Inc.
All Rights Reserved.
2 Theory of Operation
The KMPS-1-64 consists of 64 Silicon on Insulator(SOI) piezoresistive pressure sensors
mounted onto plates of 16 sensors each. These sensors are then connected to individual
pressure inputs via a manifold. The pressure sensors are grouped together in two groups of
eight per module for a total of eight groups of eight. Each group is connected to a multiplexer.
The output of the multiplexer is then routed through an analog amplifier which is then sent to
the inputs of a 24 bit delta/sigma analog to digital converter (A/D).
Each of these eight A/Ds then sends the digital information to a single microprocessor (
P).
By switching the inputs of the multiplexer it is possible for the A/Ds to measure both the
pressure output of the transducer as well as the temperature of the transducer. In this way
the
P can correct the pressure data for errors over both temperature and pressure.
Figure 1: Figure 1: Block Diagram of Scanner Electronics
When all sixty-four sensors are being polled the maximum data rate is 275
samples/channel/sec. However because the sensors are arranged in groups of eight it is
possible to increase the sampling rate by limiting the sensors that are scanned. For instance
if only sensor 1, 9, 17, 25, 33, 41, 49, and 56 (one per A/D) are scanned the data rate would
be 2000 samples/channel/sec. By selecting sensors from each of the eight different banks it
is possible to customize the data rate and number of channels available.
The sensors are numbered starting at 0 and going up to 63.
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
M
U
L
T
I
P
L
E
X
E
R
24 Bit
Delta
Sigma
A/D
Pressure and
Temperature
Data
Analog Out
Digital Out
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
Pressure Sens
M
U
L
T
I
P
L
E
X
E
R
24 Bit
Delta
Sigma
A/D
Pressure and
Temperature
Data
Sensor
Plate
Central
Electronics
Board
Micro
Controller
Summary of Contents for KMPS-1-64 Series
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