ND Series
Absolute Middle Pressure Sensors
Industrial Applications
Highly integrated sensor with ADC and DSP
Pressure ranges 15 psia (1034 mbar) to 150 psia (10.3 bar)
16-bit resolution
Exceptional Zero Stability
Integrated 50/60Hz Notch Filter
Selectable Bandwidth Filter from 1.0Hz to 200Hz
Output Data Rate at 444Hz
Total Error Band less than 0.15% FSS
Very High Accuracy +/- 0.1% of Selected Range
Long Term Stability +/- 0.1% FSS
Silicone gel protection on all models
Temperature Compensated -20°C to 85°C
Supply Voltage Compensation
Fully Integrated Compensation Math
Standard I2C and SPI Interface
Product Summary
Industry leading accuracy ‐ The ND Absolute Middle
Pressure Series provides accuracy better than 0.10% FS
and Total Error Band is also industry leading, typically
better than 0.15% FSS.
Based on Superior’s market leading, proprietary
NimbleSense™ architecture, the ND Absolute Middle
Pressure Series family supports operating temperature
from to -20°C up to 85°C. Supporting pressure ranges as
low as 15 psia (1.03 Bar) to as high as 150 psia (10.3 Bar),
the ND Absolute Middle Pressure Series is ideal for a
wide variety of applications where there is a need to
measure air and gas pressures against absolute zero
pressure.
The ND Series has a selectable bandwidth filter from 1Hz
to 200Hz, and exceptional zero stability. For added
performance, the ND Series has incorporated a 50/60Hz
notch filter to minimize the impact of power noise
spikes. The ND Series is an excellent choice for
applications requiring the utmost reliability, with longterm stability of 0.1% FSS within the first year. Finally,
the Middle Pressure ND Sensors incorporate silicone gel
to protect the sensor from any mechanical or thermal
stress during field use.
The ND Series provides a new level of integration
combining an advanced piezoresistive sensing element
with integrated amplification, ADC, DSP and a digital
interface to significantly simplify customer integration
efforts. Advanced digital processing enables new
functionality thus streamlining system development,
adding manufacturing ease and increasing reliability.
Constructed with a high reliability plastic enclosure, the
ND Series family provides the ideal combination of very
high performance and reliability at extended
temperature ranges while ensuring customers have a
high-volume, cost-effective solution optimized for a wide
array of industrial requirements.
With true 16-bit output, the ND Absolute Middle
Pressure Series measures dry air and non-aggressive gas
pressure with very high accuracy. Non-linearity is also
outstanding, typically within 0.1% FS.
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1
ND Series
Industrial Absolute Middle Pressure Sensors
Table of Contents
8
9
10
11
12
13
14
15
Maximum Ratings ................................................................ 2
Suggested Operating Conditions ......................................... 2
Environmental ..................................................................... 2
Equivalent Circuit................................................................. 2
Feature List .......................................................................... 3
Performance Characteristics ............................................... 4
Electrical Characteristics ...................................................... 4
7.1 Supply Characteristics................................................. 4
7.2 Reset Characteristics .................................................. 5
7.3 DAV Characteristics .................................................... 5
7.4 I2C Characteristics ....................................................... 5
7.5 SPI Characteristics ...................................................... 6
Materials.............................................................................. 6
8.1 Wetted Materials........................................................ 6
8.2 Material Compliance .................................................. 6
System Overview ................................................................. 7
Interface .............................................................................. 8
10.1 Reset ........................................................................... 8
10.2 Communication Interface Selection ........................... 8
10.3 SPI Interface................................................................ 8
10.4 I2C Interface ................................................................ 9
10.4.1 I2C Address ....................................................... 9
10.4.2 I2C Communications Model ............................. 9
10.4.3 I2C Clock Stretching ........................................ 10
10.4.4 I2C Bus Compatibility ...................................... 10
10.5 Extended Data Acquisition ....................................... 10
10.5.1 Available Extended Data ................................ 10
10.5.2 SPI Extended Data Read ................................. 10
10.5.3 I2C Extended Data Read ................................. 11
10.6 Control Registers ...................................................... 11
10.6.1 Mode Control Register ................................... 11
10.6.2 Rate Control Register ..................................... 12
10.7 Computing Pressure ................................................. 12
Mechanical and Manufacturing......................................... 13
11.1 Package Dimensions ................................................. 13
11.2 Suggested Pad Layout ............................................... 13
11.3 Pinout ....................................................................... 14
11.4 Reflow Soldering and Handling Conditions .............. 14
11.5 Pick and Place Pick-up Zone ..................................... 14
11.6 Packaging Options .................................................... 15
11.6.1 Tray Packaging ............................................... 15
11.6.2 Tape and Reel ................................................ 16
11.7 Part Identification ..................................................... 16
Packaging Labeling............................................................. 17
Ordering Information ........................................................ 17
Revisions ............................................................................ 18
Warranty............................................................................ 18
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Sym
Min
Max
Units
Supply Voltage
VDDM
Gnd-0.3
4.0
V
Voltage on I/O Pins
VDD > 3.3V
VDD ≤ 3.3V
VIOML
VIOMH
Gnd-0.3
Gnd-0.3
5.8
VDD+2.5
V
V
IIOM
-25
25
mA
Parameter
I/O Current
2 Suggested Operating Conditions
Sym
Min
Max
Units
VDDOP
2.8
3.5
V
TA
-20
85
°C
Parameter
Supply Voltage
Temperature
3 Environmental
Parameter
Sym
Min
Max
Units
Temperature Range
Compensated
Operating
Storage
TCMP
TOP
TSTG
-20
-20
-40
85
85
85
°C
°C
°C
Humidity
(Non-condensing)
RHOP
0
95
% RH
Vibration
(10Hz-2kHz)
GVIBE
-
15
g
Shock (6 ms)
GSHOCK
-
100
g
Life
CYLIFE
10M
-
Pressure
Cycles
4 Equivalent Circuit
DAV
DAV
Not
Used
PABS
nRST
Port A
Port B
MISO/SDA
Sensor
(SPI)
MOSI/SCL
SCK
nSS
2
Not
Used
Port A
PABS
Port B
nRST
MISO/SDA
Sensor
(I2C)
MOSI/SCL
SCK
nSS
VDD
VDD
Gnd
Gnd
VI2C Address
FIG-0124A
1
2
3
4
5
6
7
1 Maximum Ratings
ND Series
Industrial Absolute Middle Pressure Sensors
5 Feature List
Middle Pressure Absolute (psia Ranges)
Parameter
FS Pressure Range
Sym
ND015A
ND030A
ND060A
Units
PFSR
0 to 15
0 to 30
0 to 60
psia
Notes
Number of BW Filter Corners
BWNUM
8
Each
BW Corner Frequency Extents
fBWEXT
1.0 to 200
Hz
Proof Pressure
PPROOF
35
100
150
psia
1
Burst Pressure
PBURST
40
125
175
psia
2
Sym
ND100A
ND150A
Units
PFSR
0 to 100
0 to 150
psia
Middle Pressure Absolute Cont'd (psia Ranges)
Parameter
FS Pressure Range
Notes
Number of BW Filter Corners
BWNUM
8
Each
BW Corner Frequency Extents
fBWEXT
1.0 to 200
Hz
Proof Pressure
PPROOF
200
250
psia
1
Burst Pressure
PBURST
250
300
psia
2
1) Pressure at which the sensor will not suffer permanent damage.
2) Pressure if exceeded could cause permanent damage to the sensor.
3
ND Series
Industrial Absolute Middle Pressure Sensors
6 Performance Characteristics
Note: Unless otherwise specified, characteristics specified with VDD = 3.3V, TA = 25C
All Series Devices
Parameter
Sym
Units
Min
Typ
Max
Notes
Accuracy
PACC
-
0.1
0.25
% FS
1
Total Error Band
TEB
-
0.15
0.5
% FS
2
Long Term Stability
LTS
-
0.1
0.25
% FS/YR1
6
Thermal Hysteresis
THYS
-
0.1
-
% FS
Pressure Hysteresis
PHYS
-
0.05
-
% RNG
Supply Rejection
PSR
-
0.0005
-
% FS/mV
Resolution
RES
-
16
-
bit
3
System ENOB
ENOB
-
16.5
-
BitRMS
4
Data Update Rate
fUPDATE
432
444
456
Hz
5
1
1) Percentage of selected range.
2) Includes errors of offset, span, hysteresis and thermal effects.
3) Each selected range has the specified resolution
4) ENOB stated for fBW set to 1.0 Hz.
5) The internal update rate is fixed and does not change with range or filter settings. Sampling at lower data rates are possible provided the
Nyquist frequency is observed. It is suggested to sample at least 3x the set fBW frequency.
6) YR1 is the first year. The most significant drift occurs during the first year and is lessened for each subsequent year. For each subsequent
year, use 25% of the prior years' drift figure to estimate the drift for that specific year.
7 Electrical Characteristics
7.1 Supply Characteristics
Parameter
Sym
All Series Devices
Min
Typ
Max
Units
Supply Current
IDD
-
5.0
5.5
mA
Supply Capacitance
CDD
-
10
-
uF
Notes
1
1) Supply capacitance is provided within the part however it is recommended to include a 0.1 uF decoupling cap near the supply pads.
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4
ND Series
Industrial Absolute Middle Pressure Sensors
7.2 Reset Characteristics
Min
All Series Devices
Typ
Max
Rising Voltage on VDD
Falling Voltage on VDD
0.75
1.4
-
1.36
V
V
tIOD
From POR or External
Reset
-
-
40
ms
First Response
Settling Time
tFRD
From POR or External
Reset
-
-
80
ms
External Reset Low
tRSTL
15
-
-
us
Input High Voltage
VIH
VDD-0.6
-
-
2
Input Low Voltage
VIL
-
-
0.6
2
Internal Pull-Up
Current
IPU
-
-20
-30
uA
2
Input Capacitance
CIN
-
7
-
pF
2
Min
All Series Devices
Typ
Max
Units
Notes
Parameter
Sym
Power-On Reset
Threshold
VPORR
VPORF
Interface Detect
Delay
Condition
VIN = 0V
Units
Notes
1
1) The filter settling time to ensure the first reading is completely settled.
2) Input nRST
7.3 DAV Characteristics
Parameter
Sym
Condition
Output High Voltage
VOH
IO = -3 mA
VDD-0.7
-
-
V
Output Low Voltage
VOL
IO = 8 mA
-
-
0.6
V
Min
All Series Devices
Typ
Max
7.4 I2C Characteristics
Parameter
Sym
SCL Clock Frequency
fSCL
100
-
250
kHz
Clock Stretch Time
tCKSTR
-
15
100
us
Input High Voltage
VIH
VDD-0.6
-
-
Input Low Voltage
VIL
-
-
0.6
Output Low Voltage
VOL
-
-
0.6
V
Input Capacitance
CIO
-
7
-
pF
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Condition
IO = 8 mA
5
Units
Notes
ND Series
Industrial Absolute Middle Pressure Sensors
7.5 SPI Characteristics
Min
All Series Devices
Typ
Max
IO = -3 mA
VDD-0.7
-
IO = 8 mA
-
VIH
Input Low Voltage
VIL
Internal Pull-Up
Current
IPU
Time nSS to First
SCK Edge
Parameter
Sym
Output High Voltage
VOH
Output Low Voltage
VOL
Input High Voltage
Condition
Units
Notes
-
V
1
-
0.6
V
1
VDD-0.6
-
-
2, 3
-
-
0.6
2, 3
-
-10
-30
uA
tSC
100
-
-
us
Clock Cycle Time
tCC
6
-
-
us
Byte to Byte Cycle
Time
tBC
100
-
-
us
Time Last Clock to
nSS High
tCN
20
-
-
us
Cycle Time nSS
tCS
6
-
-
us
Input Capacitance
CIN
-
7
-
pF
VIN = 0V
1) Output MOSI
2) Inputs MISO, SCK, nSS
3) Inputs are 5V compliant.
8 Materials
8.1 Wetted Materials
Parameter
Wetted Materials
All Series Devices
PA
PB
Sym
MATWET
Not Used
Units
Notes
Units
Notes
Epoxy
Nylon
RTV
Silicon
Gold
Sil-Gel
8.2 Material Compliance
Sym
All Series Devices
RoHS
REGRoHS
RoHS Compliant
REACH
REGREAC
REACH Compliant
Parameter
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6
2, 3
2
ND Series
Industrial Absolute Middle Pressure Sensors
9 System Overview
The ND Series pressure sensor is a fully integrated pressure acquisition system in a sensor module. The acquisition system includes
anti-alias filters, data acquisition, 50/60Hz notch filter, sensor compensation, bandwidth limiting and I/O functions. Refer to the
figure below for the ND Series block diagram.
Block Diagram
User Control Registers
Pressure
Sensor
Anti-Alias
Filter
Mode Control
Δ-Sigma
Modulator
1b
Va
Anti-Alias
Filter
3b
BW
Control
HW
Interface
Rate
Controller
Δ-Sigma
Modulator
Decimation
To
Enable
Rate Control
4
50/60Hz
Notch
(Sinc1)
4
Compensation
FPU with
Linearization
4
BW Limit
IIR
(2nd Order)
SPI/I2C
Interface
DAV
nRST
MISO/SDA
MOSI/SCL
SCK
nSS
SAR ADC
26 Term
Compensation
Coefficients
SAR ADC
FIG-0125A
Vs
MCU
There are also two user controlled registers that tune the sensor to the specific user requirements. The first register is the Mode
Control register that determines the output pressure range, the corner frequency of the bandwidth limiting filter and enables or
disables the 50/60Hz notch filter.
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Rate Control
Register
Reload Value
Internal Update
(fUPDATE)
Down Counter
Zero
Data Read
7
S
R
Q
DAV
FIG-0012B
The second register is the Rate Control register which
controls the rate at which the Data Available (DAV) pin is
asserted. The internal sensor data update rate of 444 Hz
is often much faster than industrial requirements so the
Rate Control register can throttle down the rate at
which the Data Available pin (DAV) is asserted. The DAV
is reset upon each read of the pressure sensor. An
internal model of the Rate Controller is illustrated in the
figure to the right.
ND Series
Industrial Absolute Middle Pressure Sensors
10 Interface
10.1 Reset
Reset timing is shown in the diagram below.
The communications method (SPI or I2C) is established during the time just after reset. During this time (tIOD), no communications
should take place.
Also, the internal filters are settling during the time tFRD and data acquired during this time may not be fully settled.
Reset Timing Diagram
VPORR
VDD
VPORF
Internal Reset
tRSTL
_RST
tIOD
Communications
Available
tIOD
tFRD
tFRD
FIG-0021A
Filters Settled
10.2 Communication Interface Selection
The communications interface is selected by interrogating the nSS pin after the internal power on reset delay. If nSS is high, the SPI
interface will be selected otherwise (if low) the I2C interface will be selected. Grounding the nSS pin is an acceptable method for
selecting the I2C interface. NOTE: The I2C interface supports 10 interface addresses. Refer to section 10.4.1 for the details on I2C
address selection.
10.3 SPI Interface
The SPI interface uses a 16 bit transfer for all communications. Data is MSB first for both MOSI and MISO data transfers. Refer to the
figure below for specific timing requirements.
SPI Timing Diagram
ts c
tcc
tbc
tcn
tcs
SCK
MOSI
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MISO
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
FIG-0013A
nSS
The data communication has been reduced to a simple 16 bit transfer model for reading the pressure output. Each communication
cycle consists of master sending the Mode and Rate data to be placed into the sensor Mode Register and Rate Registers respectively.
Simultaneously, the sensor sends the pressure data for the master to receive. Refer to the figure below for the data communication
model of the ND Series sensor.
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8
ND Series
Industrial Absolute Middle Pressure Sensors
The requirement to send the Mode and Rate bytes on each data read cycle is intentional. The purpose is to force the master to send
specific data for each communication and prevent inadvertent data from being sent to the sensor. Since a SPI interface will generally
re-circulate data through its shift register, the intention is to prevent the pressure output from the sensor from being re-circulated
back to the sensor and potentially causing unintended corruption of the intended mode register.
SPI Data Diagram
SCK
MOSI
User Mode Byte
User Rate Byte
MISO
Pressure Output High Byte
Pressure Output Low Byte
FIG-0014A
nSS
10.4 I2C Interface
The ND Series is compatible with the I2C protocol. For detailed information regarding the I2C protocol, please refer to the Philips I2C
Bus Specification, Version 2.
10.4.1 I2C Address
I2C Address Selection Table
Address Address
(decimal) (hex)
5.6
49
0x31
12
48
0x30
27
47
0x2F
51
46
0x2E
100
45
0x2D
100
44
0x2C
100
43
0x2B
100
42
0x2A
100
41
0x29
NoPop
40
0x28
R1 (kΩ) R2 (kΩ)
120
120
120
120
120
56
30
15
5.6
0
The I2C address is set to 0x28 by grounding the SCK line. Other I2C addresses can be established
by applying a voltage to the SCK line by use of a resistor divider across the sensor supply
voltage. The suggested resistor values and the respective I2C address are shown in the table to
the left.
Note: R1 is the lower resister of the divider where R2 is the upper resistor of the divider.
10.4.2 I2C Communications Model
The sensor is configured as a slave device and as such,
the communicating host must be configured as a master.
There are two types of possible data transfers, data
transfers from the master transmitter to an addressed
sensor (WRITE), and data transfers from an addressed
sensor to a master receiver (READ). The master device
initiates both types of data transfers and provides the
serial clock pulses on SCL.
The communications model for I2C is similar to that of SPI
however, since I2C is a half-duplex protocol, the transfer
of information to and from the sensor is separated into
two separate communications. This is in contrast to the
SPI interface where the transmitted and received data
occurs simultaneously to and from the host. Refer to the
figure to the right for the data communication model for
the ND Series sensors.
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9
ND Series
Industrial Absolute Middle Pressure Sensors
10.4.3 I2C Clock Stretching
The figure to the right illustrates the I2C
clock stretching by the sensor. At times, the
sensor requires additional time to respond
to the host and utilizes the clock stretching
feature of the I2C protocol. This is
accomplished by holding the SCL low after
the ACK cycle of a data transfer. Refer to
Section 7.4 for the clock stretching timing.
Note, the maximum clock stretch time will
generally only occur once during the three
ACK cycles of a two byte transfer. That is,
the balance of ACK's during a multi-byte
transfer will generally include the typical clock stretching time.
10.4.4 I2C Bus Compatibility
The I2C specification allows any recessive voltage between 3.0 and 5.0 V. Different devices on the bus may operate at different
voltage levels. However, the maximum voltage on any port pin must conform to the electrical characteristics specifications (See
section 1). The bi-directional SCL (serial clock) and SDA (serial data) lines must be connected to a positive power supply voltage
through a pull-up resistor or similar circuit. Every device connected to the bus must have an open-drain or open-collector output for
both the SCL and SDA lines, so that both are pulled high (recessive state) when the bus is free.
10.5 Extended Data Acquisition
10.5.1 Available Extended Data
For either the SPI or I2C interface, additional data is available beyond the pressure. The means to access this extended data is to
continue reading data (either SPI or I2C) beyond the first 16 bits of pressure information. The following table defines the order of the
available data and respective format.
Data
Bytes
Format
Interpretation
Example
Pressure
1-2
2 byte, Unsigned
Int
See Section 10.7
See Section 10.7
Temperature
3-4
2 byte, Signed Int
Fixed Decimal [8.8 bits], Upper 8
bits integer, lower 8 bits
fractional. Temperature in °C
1880H (18.80H) = 24.5°C
Model
5-12
8 byte, ASCII, null
terminated
Right reading ASCII with null
termination
4EH,44H,30H,31H,35H,41H,00H,xxH = ND015A
Serial Number
13-16
4 byte, Hex
Unique 4 byte serial for each part
2FD627A4H
Build Number
17-22
6 byte, ASCII, null
terminated
Right reading ASCII with null
termination
30H,31H,34H,37H,41H,00H = 0147A
10.5.2 SPI Extended Data Read
Reading the extended data while using the SPI interface is the same as shown in Section 10.3 with the exception that the master
continues to read during the same nSS sequence to read all 22 bytes of the extended data. Any portion of the 22 bytes can be read
during the transfer. That is, for example, 4 bytes could be read to acquire only the pressure and temperature information. When
reading the extended data, only the first two bytes sent to the sensor (User Mode and User Rate) are used to set the internal
registers. The subsequent bytes (bytes 5 through 22) are ignored. Data read following the first 22 bytes is undefined.
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10
ND Series
Industrial Absolute Middle Pressure Sensors
10.5.3 I2C Extended Data Read
Reading the extended data via the I2C interface is similar to using the SPI interface where the master can simply continue to reading
the sensor during the pressure reading transfer. The master continues Ack'ing until the number of desired bytes are read.
10.6 Control Registers
10.6.1 Mode Control Register
Mode Control Register Detail
Default Value: 0xF7
Mode Register (General)
Details of the Mode Control register are illustrated in the
figure to the right.
b7
b6
b5
b4
b3
b2
b1
b0
Pressure Range Select
Bits 0-2 control the output pressure range.
I/O Watchdog Enable
BW Limit Select
Bit 3 is the I/O Watchdog Enable bit. When set, the I/O
watchdog is enabled. When enabled, the I/O watchdog
will monitor the I/O activity. If I/O activity is not detected
for the I/O Watchdog timeout time, the pressure sensor
will reset itself. The I/O watchdog timeout time is
determined by the currently active bandwidth setting.
Notch Enable
Mode Register (Detail)
b7
b6
b5
b4
b3
b2
b1
b0
Bits 4-6 control the BW Limit Filter.
ND015A
Bit 7 is the Notch Filter Enable bit. When enabled, the
50/60Hz notch filter is active.
It should be noted that upon changing the Mode Control
value, there is a one cycle latency before the new Mode
Control value becomes valid. That is, the data of the
communication cycle following a change to the Mode
Control register will not reflect the change. It is not until
the second communication cycle that the change in the
Mode Control register will be reflected in the output data.
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Pressure Range Select (by Model)
ND030A ND060A ND100A ND150A
Reserved
Do NOT Use
15.0 psi
30.0 psi
60.0 psi
100 psi
150 psi
I/O Watchdog Enable
0
Disabled
1
Enabled
BW Limit Select
I/O Watchdog Timeout
0
0
0
1.0 Hz
1 sec
0
0
1
2.0 Hz
500 ms
0
1
0
5.0 Hz
200 ms
0
1
1
10 Hz
200 ms
1
0
0
20 Hz
200 ms
1
0
1
50 Hz
200 ms
1
1
0
100 Hz
200 ms
1
1
1
200 Hz
200 ms
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11
Notch Filter Disabled
1
Notch Filter Enabled
FIG-0126A
Notch Enable
0
ND Series
Industrial Absolute Middle Pressure Sensors
10.6.2 Rate Control Register
Default Value: 0x1C
Rate Control Register Detail
The Rate Control Register controls the rate at which the DAV
pin is asserted indicating new data is available. This register
is primarily used to throttle down the actual data transfer
rate (when using the DAV as the trigger to sample) since the
general industrial requirement is less than the internal 444
Hz update rate.
This register functions as the reload value of a data rate
counter. The value of the Rate Control Register is the divisor
of the 444 Hz internal data rate. Since a divisor of zero is not
possible, a zero value will select the auto-select rate mode.
In this mode, the rate is selected based on the selected
bandwidth limit. The auto rate value is roughly 3x the corner
frequency of the selected bandwidth limit in all auto
selected rates (where possible).
b6
b5
b4
b3
b2
b1
b0
0
0
0
0
0
0
0
0
Auto Select
0
0
0
0
0
0
0
1
444 Hz
0
0
0
0
0
0
1
0
222 Hz
0
0
0
0
0
0
1
1
148 Hz
1
1
1
1
1
1
1
0
1.75 Hz
1
1
1
1
1
1
1
1
1.74 Hz
Selected BW Limit
Auto Select Rate
1.0 Hz
3.0 Hz
2.0 Hz
6.0 Hz
5.0 Hz
15.3 Hz
10 Hz
31.7 Hz
20 Hz
63.4 Hz
50 Hz
148 Hz
100 Hz
444 Hz
200 Hz
444 Hz
Note: Start-up time for the sensor is approximately 80ms for
the first sample to be settled. Requesting data during this
time will result in invalid information. However, this start-up
time can be used for configuring the Mode and Rate
registers by performing a transfer with the desired Mode
and Rate register values and discarding the received
pressure data. After waiting the required start-up time, the
sensor will respond with desired data since the Mode and
Rate registers have been pre-established.
FIG-0084A
Rate Control Register
b7
10.7 Computing Pressure
The pressure data is in the form of 16 bit unsigned integer sent in high byte then low byte order. This is a single ended output by
definition and the data range is 0 to 216. There is a 10% margin (5% either end) in the output scaling and the selected full scale will
reside in the 5% to 95% of the total available output data range. Refer to Equation 1 (below) for the general model for computing
the output pressure. As an example, if the sensor output is 37,646 counts using an ND015A (15 psia) device, then the output
pressure is 8.74 psia.
𝐸𝐸𝐸𝐸 1: 𝑃𝑃𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 =
(𝑂𝑂𝑂𝑂𝑂𝑂𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 − 5%∗2^16)
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90% ∗ 216
∗ 𝐹𝐹𝐹𝐹
𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸 1: 𝑃𝑃𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 =
12
(37,644 − 3,276.8)
90% ∗ 216
∗ 15 𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 = 8.74 𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝
ND Series
Industrial Absolute Middle Pressure Sensors
11 Mechanical and Manufacturing
11.1 Package Dimensions
11.2 Suggested Pad Layout
The suggested pad layout is shown in the figure below. An Eagle PCB symbol library is available with the shown pad dimensions.
Please consult the factory to obtain the library.
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13
ND Series
Industrial Absolute Middle Pressure Sensors
11.3 Pinout
Pin
Sym
1
nSS
2
3
4
5
6
7
8
9
10
11
MOSI/SCL
MISO/SDA
SCK
DNC
DNC
DNC
Gnd
VDD
nRST
DAV
SPI
I 2C
Slave Select
Tie to Ground
(active low)
MOSI
SCL
MISO
SDA
Serial Clock
See Section 10.4.1
Do Not Connect
Do Not Connect
Do Not Connect
Ground
Sensor Supply
Reset (active low)
Data Available
11.4 Reflow Soldering and Handling Conditions
Parameter
Sym
Val
Units
Soldering Specifications (Max)
Preheat Ramp Rate
Soak Time
Time Above 217C
Time Above 230C
Time Above 250C
Peak Temperature
Cooling Ramp Rate
tPHRR
tSOAK
tGT217
tGT230
tGT250
tPT
tCRR
3
3
50
40
15
255
-4
°C/s
min
s
s
s
°C
°C/s
Weight
WPRT
3.5
gm
Moisture Sensitivity
MSL
3
ESD (Human Body Model)
ESD
2
kV
11.5 Pick and Place Pick-up Zone
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14
ND Series
Industrial Absolute Middle Pressure Sensors
11.6 Packaging Options
11.6.1 Tray Packaging
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15
ND Series
Industrial Absolute Middle Pressure Sensors
11.6.2 Tape and Reel
11.7 Part Identification
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16
ND Series
Industrial Absolute Middle Pressure Sensors
12 Packaging Labeling
Packaging labels are provided with barcode Code 128 symbology. The provided fields are Company
Name, Part Number, Packaging ID and Quantity. The Packaging ID traces back to the Lot Number (or
Lot Numbers) contained in the package. The purpose is to eliminate multiple labels (one for each
included Lot Number) in the event of multiple Lot Numbers within a single package. This is for ease of
customer tracking and maintenance. The Packaging ID is a 24 bit value printed in hexadecimal format.
13 Ordering Information
Part Number
ND015A-SM02
ND030A-SM02
ND060A-SM02
ND100A-SM02
ND150A-SM02
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Part
Package
SM02
SM02
SM02
SM02
SM02
Packaging
Packaging
Qty
Order Number
Tape and Reel
Multi-Tray
Single Tray
Quarter Reel
Cut Tape
256
512
64
64
1-63
ND015A-SM02-R
ND015A -SM02-M
ND015A -SM02-T
ND015A -SM02-Q
ND015A -SM02-C
Tape and Reel
Multi-Tray
Single Tray
Quarter Reel
Cut Tape
256
512
64
64
1-63
ND030A-SM02-R
ND030A -SM02-M
ND030A -SM02-T
ND030A -SM02-Q
ND030A -SM02-C
Tape and Reel
Multi-Tray
Single Tray
Quarter Reel
Cut Tape
256
512
64
64
1-63
ND060A-SM02-R
ND060A -SM02-M
ND060A -SM02-T
ND060A -SM02-Q
ND060A -SM02-C
Tape and Reel
Multi-Tray
Single Tray
Quarter Reel
Cut Tape
256
512
64
64
1-63
ND100A-SM02-R
ND100A -SM02-M
ND100A -SM02-T
ND100A -SM02-Q
ND100A -SM02-C
Tape and Reel
Multi-Tray
Single Tray
Quarter Reel
Cut Tape
256
512
64
64
1-63
ND150A-SM02-R
ND150A -SM02-M
ND150A -SM02-T
ND150A -SM02-Q
ND150A -SM02-C
17
ND Series
Industrial Absolute Middle Pressure Sensors
14 Revisions
Rev
A
Change Description(s)
Initial Release
Date
By
12/26/21
T.S.
15 Warranty
Superior Sensor Technology and its subsidiaries warrant goods of its manufacture as being free of defective materials and faulty
workmanship during the applicable warranty period. In all cases, Superior Sensor Technology's standard product warranty applies;
please refer to your order acknowledgement or consult your local sales office for specific warranty details.
If warranted goods are returned to Superior Sensor Technology during the period of coverage, Superior Sensor Technology will
repair or replace, at its option, without charge those items that Superior Sensor Technology, in its sole discretion, finds defective.
The foregoing is buyer’s sole remedy and is in lieu of all other warranties, expressed or implied. In no event shall Superior Sensor
Technology be liable for consequential, special, or indirect damages.
While Superior Sensor Technology may provide application assistance personally, through literature or the Superior Sensor
Technology web site, it is buyer's sole responsibility to determine the suitability of the product in their application. Superior Sensor
Technology assumes no liability for applications assistance or customer product design.
Superior Sensor Technology reserves the right to make corrections, modifications, enhancements, improvements and other changes
to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the
latest relevant information before placing orders and should verify that such information is current and complete.
Superior SENSOR TECHNOLOGY
103 Cooper Court
Los Gatos, CA 95032
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info@SuperiorSensors.com
+1.408.703.2950
NimbleSense is a trademark of Superior Sensor Technology
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18