December 2009
Rev – 1.4
Differential Pressure Sensor Board
SP1202S01RB
Users' Guide
© 2009 National Semiconductor Corporation.
1
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Table of Contents
1.0 Introduction............................................................................................................................ 3
2.0 Board Assembly .................................................................................................................... 3
3.0 Quick Start............................................................................................................................. 3
4.0 Functional Description........................................................................................................... 4
4.1 Operational Modes................................................................................................... 4
4.1.1 The Computer Mode ................................................................................ 4
4.1.2 The Stand-Alone Mode ............................................................................ 4
4.2 Signal Conditioning Circuitry .................................................................................... 4
4.2.1 The Amplifier ............................................................................................ 4
4.2.1.1 Amplifier Gain Customization................................................... 4
4.2.1.2 Using Sensors with a Gain Resistor ........................................ 4
4.2.2 Sensor Drive ............................................................................................ 5
4.2.2.1 Sensor Voltage Drive ............................................................... 5
4.2.2.2 Sensor Current Drive ............................................................... 5
4.2.3 Offset Correction ...................................................................................... 5
4.2.4 Non-Linearity Correction .......................................................................... 5
4.2.5 Level Shifting............................................................................................ 5
4.3 Power Supply ........................................................................................................... 5
4.3.1 +3.3V up to +12V Operation .................................................................... 5
4.4 ADC Reference Circuitry.......................................................................................... 5
4.5 ADC clock................................................................................................................. 6
4.6 Digital Data Output. .................................................................................................. 6
4.7 Power Requirements................................................................................................ 6
5.0 Installing and Using the Sensor Path Pressure Sensor Board ............................................. 6
5.1 Board Set-up ............................................................................................................ 6
5.2 Quick Check of Analog Functions............................................................................ 6
5.3 Quick Check of Software and Computer Interface Operation ................................. 6
5.4 Troubleshooting ....................................................................................................... 7
6.0 Evaluation Board Specifications............................................................................................ 7
7.0 Example Hardware Schematic.............................................................................................. 8
8.0 Differential Pressure Sensor Board Example Bill of Materials.............................................. 9
Summary Tables of Test Points and Connectors ....................................................................... 10
Summary Tables of Test Points and Connectors (cont'd) .......................................................... 11
2
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1.0 Introduction
2.0 Board Assembly
The Differential Pressure Sensor
Board
(SP1202S01RB), along with the Sensor Signal Path
Control Panel (Sensor Panel) software and SPUSI2
USB Interface Dongle, are designed to ease the
design of circuits using various pressure sensors and
load cells with National Semiconductor's amplifiers
and Analog-to-Digital converters (ADCs). Use the
WEBENCH® Pressure Sensor Designer tool to
determine appropriate ICs and passive components
to achieve your signal path requirements:
http://webench.national.com/webench5/sensors/pres
sure
This Differential Pressure Sensor Board comes as a
bare board that must be assembled. Refer to the
example Bill of Materials for a description of
component values, to Figure 1 for major component
placement and to Figure 2 for the Board schematic.
See Figure 1 for component placement and Figure 2
for example board schematic. The differential output
pressure sensor is connected to header J1 The
differential voltage at the sensor output (the voltage
at TP1 relative to the voltage at TP2) is digitized and
can be captured and displayed on the computer
monitor with the accompanying Sensor Panel
software, which operates under Microsoft Windows
XP. The amplified differential voltage may be
measured at TP3 relative to ground. The software
can provide gain and offset correction for the entire
circuit, including the sensor.
3.0 Quick Start
Refer to Figure 1 for locations of test points and
major components. This Quick Start procedure
provides 5V excitation for the sensor.
1. Place the J2 jumper across pins 1 & 2.
2. Place the J3 jumper across pins 2 & 3.
3. Connect the Differential Pressure Sensor Board
to a SPUSI2 board via 14-pin header J4 and
connect a USB cable between the SPUSI2 board
and a PC USB port. Red LEDs D2 on the
differential Pressure Sensor Board and D1 on the
SPUSI2 board should come on if the PC is on.
4. Connect the pressure sensor to 6-pin connector
J1 of the board.
5. If not already installed, install the Sensor Panel
software on the PC. Run the software.
Figure 1. Component and Test Point Locations
3
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4.0 Functional Description
The Differential Pressure Sensor Board component
and test point locations are shown in Figure 1. The
board schematic is shown in Figure 2.
4.1 Operational Modes
This board may be use in one of two modes: the
Computer Mode using the SPUSI2 USB Interface
Dongle or the Stand-Alone Mode without the use of
the SPUSI2 USB Interface Dongle and a PC.
4.1.1 The Computer Mode
The board is intended for use in the Computer Mode,
where a SPUSI2 board is used with it and the
SPUSI2 board is connected to a PC via a USB port.
Power to both boards is provided via USB.
4.1.2 The Stand-Alone Mode
The Stand-Alone Mode does not use the SPUSI2
board to capture data and upload it to a PC. To use
the board this way, the user must provide +5V at pin
14 of header J4 as well as provide ADC clock and
Chip Select signals to the ADC at pins 3 and 1,
respectively, of J4. ADC data output is available at
pin 5 of J4. Test Points TP10, TP11 and TP12 may
also be used to insert/read these signals. The range
of frequencies for the ADC clock is 1 MHz to 4 MHz.
The CS rate can be as low as desired, but no faster
than 17 times the ADC clock rate.
The overall gain from the sensor to the ADC input,
then, is
Overall Gain = (1 + 2 * RF1 / RG1) * RB1 / RA1.
Because of the way the difference amplifier is
connected to the final amplifier, the overall gain is
positive, hence the negative sign of the final amplifier
is not included in the overall gain equation.
4.2.1.1 Amplifier Gain Customization
Customization of the circuit consists primarily of
adjusting the amplifier gain. As indicated above, the
overall gain from the sensor to the ADC input is
defined as
Overall Gain = AV = (1 + 2 * RF1 / RG1) * RB1 /
RA1.
Of course, this assumes that RF1 = RF2, RA1 = RA2
and RB1 = RB2. Rearranging the above equation
and solving for AV results in
RG1 = (2 * RF1 * RB1) / (AV * RA1 - RB1).
However, resistor tolerance can cause the ADC to
reach full scale early. The solution to this is to
assume RF1 and RB1 tolerance to be high and the
tolerance of RA1 and RG1 to be low. This correctly
implies that the required nominal value of RG1
should be a minimum of
RG1 = [ (2 * H * RF1 * RB1) / (AV * L * RA1 - H * RB1) ].
Where H = 1 + resistor tolerance
and L = 1 - resistor tolerance
4.2 Signal Conditioning Circuitry
The sensor output voltage is found at TP1 relative to
TP2. This voltage is amplified and digitized by U5, an
ADC. The full-scale value of this voltage after
amplification will depend upon the maximum sensor
output and the component values. This amplified
voltage is presented to the ADC (U5), whose output
is at header J4.
4.2.1 The Amplifier
Most pressure sensors are used with only a positive
output at the (+) terminal with respect to the (-)
terminal and this is the intended use of this board. If
an offset is desired because the sensor (+) terminal
could be negative with respect to its (-) terminal,
resistor RB2 should be returned to a positive
potential equal to half of the ADC reference voltage,
found at test point TP13.
Amplifiers U2A and U2B form an difference amplifier
which amplifies the differential output of the bridge
transducer. The gain of the difference amplifier,
assuming RF1 = RF2, is the classic
Differential Gain = 1 + 2 * RF1 / RG1.
The differential output is converted to a single-ended
signal with amplifier U3. The gain of the U3 circuit,
assuming RB1 = RB2 and RA1 = RA2, is the wellknown
Single-Ended Gain = – RB1 / RA1.
4
For example, for a resistor tolerance 1%, H = 1.01
and L = 0.99.
4.2.1.2 Using Sensors with a Gain Resistor
Sensor output can vary by up to 50% from nominal,
in some cases. Some sensors have internal gain
resistors to precisely set the full scale output of the
sensor. To take advantage of this, connect the gain
resistor of the sensor between pins 3 and 4 of J1.
Consult the sensor data sheet to determine the
recommended value of RF1 and RF2, which is most
often 100k-Ohms.
The data sheet will indicate the full scale output level
after the differential amplifier. The second amplifier
stage should have a gain such that the differential
amplifier full scale output multiplied by this gain will
yield the ADC reference voltage. The gain of this
stage, then, should be
Gain = ADC VREF / Diff Out.
For example, one sensor calls for RF1 = RF2 = 100kOhms for a differential output of 3.012V. The ADC
reference voltage is 4.096V, therefore, the second
stage gain should be
Gain = 4.096 / 3.012 = 1.36.
Setting RB1 = RB2 = 1.33k-Ohms and setting RA1 =
RA2 = 1 k Ohms, provides a gain of 1.33 will provide
a full scale input voltage to the ADC of 4.006V,
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leaving a little headroom for resistor tolerances.
Software adjustment of gain can then do a minor
correction to precisely adjust the reading.
http://www.national.com/analog/webench/sensors/sp
usi2
4.2.2 Sensor Drive
The sensor may be driven with either a voltage
source or a current source. The default setup is for
voltage drive of the sensor at +5V
Because most sensors today use a small part of their
full pressure range, they are very linear and there is
no need for linearity correction. Consequently, there
is not provision for linearity correction on this board.
4.2.2.1 Sensor Voltage Drive
4.2.5 Level Shifting
For +5V voltage drive of the sensor, place the jumper
on J2 across pins 1 and 2. This is the default setting.
For voltage drive of the sensor with any other
potential, place the jumper on J2 across pins 2 and 3
and provide a voltage source at TP15 that is at least
1.5 Volts greater than the desired bridge voltage.
However, never exceed 12V at P1. Resistors RC1
through RC5 (lower left of Figure 2) should be set as
follows, where VBR is the desired sensor drive
voltage and VADC is the ADC supply voltage at
TP13:
Level shifting is sometimes used to raise the amplifier
output slightly when no negative supply voltage is
used in the system. This allows the accurate
measurement of pressures or forces at and near
zero. This board does not allow for this level shifting.
Set RC1 to a convenient value less than about
5k-Ohms
Set RC2 = VBR * RC1 / VADC - RC1
Set RC3 to 0 Ohms
Remove RC4 and leave open
Set RC5 to 0 Ohms
4.2.2.2 Sensor Current Drive
The current source provided on this board is a
modified Howland Current pump, which performs
quite well, but the output current does have some
sensitivity to the load impedance.
4.2.4 Non-Linearity Correction
4.3 Power Supply
In the Computer Mode, power to this board is
supplied through header J14 and ultimately from the
host PC via USB. In most cases, the only voltage
needed for the Pressure Sensor board is the +5V
from the USB connection. Diode D1 provides
protection against reverse polarity in the Stand-Alone
mode where an external supply is used. When the
bridge drive circuit using U1 is used, a separate
supply voltage is required to be provided at TP15.
The supply voltage source for the ADC (VADC on the
schematic) is selected with JP3 to be either the 4.1V
from U4, or +5V from J14.
The board is intended to be operated at +5V.
However the board is capable of operation from
+3.3V up to +12V.
4.3.1 +3.3V up to +12V Operation
The sensor may be provided with a current drive by
selecting appropriate values for resistors RC1
through RC5 and providing an appropriate voltage at
TP15. The values in the schematic of Figure 2 are for
a current drive of 1.5 mA.
In the Computer Mode, install a 6x2 header, lining up
with pin 1 marker and leaving pins 13 & 14
unconnected. Alternatively, break 2 pins (13 & 14) off
the 7x2 header supplied in the Build-It kit. In StandAlone Mode no board modifications are required.
For other current values, the WEBENCH Sensor
Designer tool will provide appropriate component
values.
Set ADC supply to output of voltage reference U5 by
placing the J3 jumper across pins 2 & 3. Use TP14 to
externally power-up board from +3.3V up to +12V.
This same voltage will power bridge when J2 jumper
is placed across pins 1 & 2. If greater voltage is
necessary to power bridge leave J2 jumper open and
use TP4 to power bridge with another external power
supply.
4.2.3 Offset Correction
If offset correction is required, two axial resistors,
RX1 & RX2 can be added as shown in the schematic
of Figure 2 to provide required offset. RX1 can be
placed from RB2 to VADC at TP13. RX2 can be
placed from RB1 to GND at TPG1. The WEBENCH
Sensor Designer tool will provide appropriate RX
resistor values to achieve your offset requirements.
If you have modified the board for offset correction
you must use the Sensor Panel software calibration
feature to capture the correct transfer function of your
sensor. Note if your board has offset correction the
Amplifier Input field in the Sensor Panel software will
no longer be correct. For more details regarding the
Sensor Panel software see the Manual at:
5
If board is operated at +5.25V and below you may
also set ADC supply to board supply by placing the
J3 jumper across pins 1 & 2.
4.4 ADC Reference Circuitry
The single-ended ADC121S021 uses its supply
voltage as its reference, so it is important that its
supply voltage be stable and quiet. A 4.1V reference
voltage is provided by U4, an accurate LM4120-4.1.
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4.5 ADC clock
The ADC clock signal is provided external to the
board at header J4. The frequency of this clock
should be in the range of 1 MHz to 4 MHz. A CS
(Chip Select) signal is also required at J4. See the
ADC data sheet for timing requirements.
4.6 Digital Data Output.
The digital output data from the ADC is available at
14-pin header J4. All digital signals to and from the
ADC are present at this connector socket.
4.7 Power Requirements
Voltage and current requirements for the Differential
Pressure Sensor Board are:
Pin 14 of J4: +5.0V at 30 mA
Pins 2 and 4 of J4: Ground
TP15: Depends upon sensor
2. Be sure all jumpers are in place per Table 2,
below.
3. Connect the sensor to J1 with the top of the
bridge connected to pin 1 and the bottom of the
bridge to pin 6. Connect the +output of the
sensor to pin 2 and the -output of the sensor to
pin 5.
4. Connect a USB cable to the SPUSI2 board and a
PC.
5. Confirm that Red LED D1 on the Differential
Pressure Sensor board is on, indicating the
presence of power to the board.
6. If the sensor contains a gain setting resistor,
connect the sensor gain set resistor across pins
3 and 4 of J1. Resistors RF1, RF2, RA1, RA2,
RB1 and RB2 may have to be adjusted as
previously described in Section 4.2.1.2.
Table 2 - Jumper Default Positions
Pins
Jumper
FUNCTION
Shorted
5.0 Installing and Using the Sensor Path
Pressure Sensor Board
This Differential Pressure Sensor board requires
power as described above. The pressure sensor
should be connected to J1 pins 2 and 5. It may be
necessary to change the value of RG1 to provide
appropriate gain for the particular sensor used. To
determine the correct value of RG1 for a given
application, first determine the required overall gain:
Total Gain = 5000 / Sensor FS (mV).
Then determine the correct value of RG1 according
to the discussion in Section 4.2.1.1.
Alternatively, with RF1 = RF2 = 10k-Ohms, RB1 =
RB2 = 2k-Ohms and RA1 = RA2 - 1k-Ohms, with all
of these resistors a 1% tolerance RG1 may be set as
indicated in Table 1. (Refer to Section 4.2.1.1.)
Table 1 - Selecting RG1
Sensor
Sensitivity
(mV/V)
Sensor
Excitation
(Volts)
RG1
Value
(Ohms)
10
5
511
10
10
1,050
25
5
1,330
25
10
2,870
50
5
2,870
50
10
6,650
100
5
6,650
100
10
20,000
J2
1-2
+5V Bridge Drive
J3
2-3
4.1V ADC Reference
5.2 Quick Check of Analog Functions
Refer to Figure 1 for locations of connectors and test
points and jumpers on the board. If at any time the
expected response is not obtained, see Section 5.4
on Troubleshooting.
1.
2.
3.
4.
Perform steps 1 through 4 of Section 5.1.
Check for 5.0V at TP14 and for 4.1V at TP13.
Check for 5V at TP4 (top of sensor).
Place a short between TP1 and TP2 and ground
these two pins. Check for a voltage less than
70mV at TP3. Then remove the TP1 to TP2
short.
5. Apply a voltage of 2.5V at TP2 and 2.54V to TP1
and check for a voltage of between 2.5V and
4.0V at TP3.
This completes the quick check of the analog portion
of the evaluation board.
5.3 Quick Check of Software and Computer
Interface Operation
5.1 Board Set-up
Refer to Figure 1 for locations of connectors, test
points and jumpers on the board.
1. Perform steps 1 through 4 of Section 5.1.
2. Run the SPC Program.
3. Place a short between TP1 and TP2 and ground
these two pins and check the SPC software
window for an output below 70 mV.
4. Remove the short between TP1 and TP2, but
keep TP2 grounded. Apply a potential of half the
sensor output to TP1 and check the SPC
software window for an output of 2.0V and 2.1V.
This completes the quick check of the software and
computer interface.
1. Connect The Differential Pressure Sensor board
to a SPUSI2 USB Interface Dongle.
6
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5.4 Troubleshooting
If there is no output from the board, check the
following:
Be sure that the proper voltages and polarities
are present at TP14 (+5V) and TP13 (+4.1V or
+5V, as selected with J3).
Be sure there is a clock signal at TP10 when
trying to capture data.
If using an actual sensor, be sure that the
positive sensor output terminal is at J1 pin 2 and
the negative sensor output terminal is at J1 pin 5.
The voltage at TP1 should be equal to or greater
than the voltage at TP2.
If the amplifier output at TP3 can not be brought
within 70 mV of ground, check the following:
Be sure there is a voltage at TP4 (top of sensor).
Be sure that the voltage on pin 6 of J1 is zero, or
that an appropriate resistor is present at R3 if the
short across it is cut.
If the ADC output is zero or a single code, check the
following:
Be sure that the proper voltages and polarities
are present at TP14 (+5V) and TP13 (+4.1V or
+5V, as selected with J3).
Be sure that J4 is properly connected to a
SPUSI2 USB Interface Dongle, and that there is
a jumper on J3.
If using an actual sensor, be sure that the
positive sensor output terminal is at J1 pin 2 and
the negative sensor output terminal is at J1 pin 5.
The voltage at TP1 should be equal to or greater
than the voltage at TP2.
6.0 Evaluation Board Specifications
Board Size:
2.6" x 2.5" (6.6 cm x 6.35 cm)
Power Requirements: +5V (30mA) at J4 pin 14
7
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7.0 Example Hardware Schematic
8
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8.0 Differential Pressure Sensor Board Example Bill of Materials
Item Qty
Reference
Part
Source
Kemet #C0805C331K5RACTU
Digi-Key #399-1140-2-ND
Vishay/Sprague #293D475X9016A2TE3
Digi-Key #718-1148-2-ND
1
4
CS1, C1, C2, C5
330pF, 50V, ±10%, 0805, X7R
2
4
C3, C6, C8, C15
4.7µF, 16V, Tant, ±20%, size
"B"
3
6
C4, C7, C9, C10, C13, C14
4
1
C11
5
-
C12
Not Stuffed
6
6
C16, C17
10pF, 100V, ±10%, 0805, NP0
7
1
D1
1N4001, DO-214AA / DO-214AC
8
1
D2
LED (RED)
9
1/6
J1
6-pin Header (0.1" - breakaway)
10
1
J2, J3
3-pin Header (0.1")
11
1
J4
2 x 7 Male Header RT/A (0.1")
12
2
RA1, RA2
1.00k, 1%, 1/10W, 0603
13
2
RB1, RB2
2.00k, 1%, 1/10W, 0603
14
2
RC1, RC3
49.9k, 1%, 1/10W, 0603
15
2
RC2, RC4
187, 1%, 1/10W, 0603
16
1
RC5
10.2, 1%, 1/10W, 0603
17
2
RF1, RF2
10.0k, 1%, 1/10W, 0603
18
1
RG1
1.07k, 1%, 1/10W, 0603
19
1
RS1
10, 5%, 1/10W, 0603
20
1
R3
0, 5%, 1/10W, 0603
21
1
R2
43, 1%, 1/10W, 0603
22
1
R7
1k, 5%, 1/10W, 0603
23
2
RX1, RX2
Selected by WEBENCH
Note resistors are axial resistors.
There is no footprint on board.
24
-
TPG1, TPG2, TPG3
Not Stuffed
n/a
25
-
TP1, TP2, TP3, TP4, TP6, TP10, TP11,
TP12, TP13, TP14, TP15
Not Stuffed
n/a
27
1
U1
LMP7702/MSOP
28
1
U2
LMP7732MM/MSOP
29
1
U3
LMP7731/SOT
30
1
U4
LM4120AIM5-4.1
31
1
U5
ADC121S021CIMF/SOT23
32
1
PCB
SP1202S01RB
Yageo #CC0805KRX7R7BB104
Digi-Key #311-1142-2-ND
Kemet #C0805C333K5RACTU
0.033µF, 50V, ±10%, 0805, X7R
Digi-Key #399-1165-2-ND
0.1µF, 16V, ±10%, 0805, X7R
9
n/a
AVX #08051A100KAT2A
Digi-Key #478-3731-2-ND
Micro Commercial #GS1A-TP
Digi-Key #GS1A-TPTR-ND
Lite-On #LTST-C930KAKT
Digi-Key #160-1461-2-ND
Molex #22-28-4363
Digi-Key #WM6536-ND
Molex #68301-1009
Digi-Key #WM17443-ND
Amp #87230-7
Digi-Key #A26599-ND
Stackpole #RNCS 16 T9 1K 0.1%
Digi-Key #RNCS16T91K0.1%ITR-ND
Stackpole #RNCS 16 T9 2K 0.1% I
Digi-Key #RNCS16T92K0.1%ITR-ND
Susumu #RRG1608P-4992-B-T5
Digi-Key #RG16P49.9KBTR-ND
Susumu #RG1608P-1870-B-T5
Digi-Key #RG1608P-1870-B-T5-ND
Yageo #RT0603BRE0710R2L
Digi-Key #RT0603BRE0710R2L-ND
Bourns#CRT0603-BY-1002ELF
Digi-Key #CRT0603-BY-1002ELFCT-ND
Susumu #RG1608P-4530-B-T5
Digi-Key #RG16P453BCT-ND
Rohm #MCR03EZPJ100
Digi-Key #RHM10GCT-ND
Rohm #MCR03EZPJ000
Digi-Key #RHM0.0GCT-ND
Susumu #RG1608P-433-B-T5
Digi-Key #RG16P43.0KBTR-ND
Rohm #MCR03EZPJ152
Digi-Key #RHM1.5KGTR-ND
Nat Semi #LMP7702MM/NOPB
Digi-Key #LMP7702MMTR-ND
Nat Semi #LMP7732MM/NOPB
Digi-Key #LMP7732MMTR-ND
Nat Semi #LMP7731MF/NOPB
Digi-Key #LMP7731MFTR-ND
Nat Semi #LM4120AIM5-4.1/NOPB
Digi-Key #LM4120AIM5-4.1TR-ND
Nat Semi #ADC121S021CIMF/NOPB
Digi-Key #ADC121S021CIMFTR-ND
Advanced Circuits
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10
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APPENDIX
Summary Tables of Test Points and Connectors
Test Points on the Differential Pressure Sensor Board
Identifier
TP 1
TP 2
TP 3
TP 4
TP 5
TP 6
TP 7
TP 8
TP 9
TP 10
TP 11
TP 12
TP 13
TP 14
TP 15
TPGx
Name
+IN
-IN
ADC IN+
BR_TOP
+3V3
SCLK
CSb
DOUT
VADC
+5V
V_EXT
GND
Function
(+) Input from Bridge
(-) Input from Bridge
ADC +Input voltage
Top of bridge
Identifier not used
+3.3V from SPUSI2 Board (not used on this board)
Identifier not used
Identifier not used
Identifier not used
SCLK input for ADC
CSb input for ADC
SDATA output from ADC
ADC supply voltage/reference
Overall supply for board from SPUSI2 Board
Bridge Driver Amplifier supply voltage
Ground
J1 Connector - Sensor Interface
Identifier
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
Name
Bridge "TOP"
Bridge +Out
Gain Resistor
Gain Resistor
Bridge -Out
Bridge "BOT"
Function
Positive sensor excitation
+ Output from Sensor
Gain Resistor Connection
Gain Resistor Connection
- Output from Sensor
Ground or negative sensor excitation
J2 Jumper - V_BR_SEL
Shorted Positions
1-2
2-3
Results
+5V Drive of Sensor
U1 Drive of Sensor(Voltage or Current, depending upon components around U1
J3 Jumper - VADC_SEL
Shorted Positions
1-2
2-3
Results
+5V for ADC Supply and Reference Voltage
+4.1V for ADC Supply and Reference Voltage
11
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Summary Tables of Test Points and Connectors (cont'd)
J7 Connector - Connection to SPUSI2 Board
J7 Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Voltage or Signal
CSb input to ADC
Ground
SCLK input to ADC
Ground
SDATA output from ADC
no connection
no connection
no connection
no connection
no connection
no connection
no connection
+3.3V from SPUSI2 USB Interface Dongle
+5V from SPUSI2 USB Interface Dongle
12
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[Blank Page]
13
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The Differential Pressure Sensor Board is intended for product evaluation purposes only and is not intended for resale to end consumers, is
not authorized for such use and is not designed for compliance with European EMC Directive 89/336/EEC.
National does not assume any responsibility for use of any circuitry or software supplied or described. No circuit patent licenses are implied.
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used
herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform,
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury to the user.
National Semiconductor Corporation
Americas
Tel:
1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
National Semiconductor Europe
Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80 532 78 32
Français Tel: +49 (0) 1 80 532 93 58
Italiano Tel: +49 (0) 1 80 534 16 8
2. A critical component is any component in a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: sea.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
www.national.com
National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without
notice to change said circuitry and specifications.
14
http://www.national.com
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