3–422
Motorola Sensor Device Data
For More Information On This Product,
Go to: www.freescale.com
Figure 6 illustrates the particular layout chosen for the
evaluation board (LED and R12 are not shown). This layout
can serve as a fully functional stand–alone board or can be the
basis for integration into a system level layout. Through hole
mounted components have been selected, and this dictates
the particular footprint dimensions. However, with surface
mount components, this layout can be made significantly
smaller.
Component Side
Figure 6a. Board Layout
Figure 6b. Board Layout
Back Side
EVALUATION NOTES:
This board is designed to run from a regulated power source
or from batteries. Since the pressure sensors are ratio–metric
(meaning that the output scales with the applied supply
voltage), supply voltages ranging from 3V to 10V can be used.
The specified op-amp operates well within these values.
In terms of sensor packages, four variations are
recommended. They are the MPX2010D, MPX201DP,
MPX2010GP and the MPXC2011DT1. Either of these sensors
can be directly mounted on the board itself or can be remotely
mounted and connected to it via wires. The customer can
select the proper package depending on size requirements
and on whether gauge, vacuum or differential pressure will be
sensed. In particular, the MPXC2011DT1, known as the
ChipPak sensor, is a very small package and can be used to
sense differential and vacuum pressure provided that ports
are attached on each side as shown in Figure 1. Note that
Motorola does not provide these ports as standard products.
Since the output signal of the evaluation board can be fined
tuned to be a very measurable voltage, interfacing the board
to an A/D, microprocessor, or other circuitry is very
straightforward.
CONCLUSION
The low-pressure evaluation board provides design
flexibility in terms of amplification, output type and packaging.
Gains ranging from 50 up to 1500 can be easily implemented
by simply soldering specific resistors and manipulating a few
jumpers. Jumpers also control the type of output and allow the
user to select analog or switching signals. Two sets of through
hole sensor connections are provided for various pressure
sensor packages, and customers are free to remotely mount
the board via wires.
In many applications, such as HVAC systems or medical
respiratory equipment, quick and effective component
evaluation is critical. The flexible features of this board allow
a customer to reduce development time.
F
Freescale Semiconductor, Inc.
n
.