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DLV Series Low Voltage Digital Pressure Sensors
Features
• 5 to 60 psi and Barometric Pressure Ranges
• 3.3V or 5.0V Supply Voltage
• I2C or SPI Interface
• Better than 0.5% Accuracy Over Temperature Typical
• Die Sil-Gel Coating for Enhanced Media Protection
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Applications
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General Description
• Medical Breathing
• Environmental Controls
• HVAC
• Industrial Controls
• Portable/Hand-Held Equipment
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The DLV Series Mini Digital Output Sensor is based on the already popular DLVR series pressure sensors. This series
utilizes single chip technology and offers excellent performance over middle (5 psi to 60 psi) and barometric pressure
ranges.
The supply voltage options ease integration of the sensors into a wide range of process control and measurement
systems, allowing direct connection to either I2C or SPI serial communications channels. For battery-powered sys-
tems, the sensors can enter very low-power modes between readings to minimize load on the power supply.
These calibrated and compensated sensors provide accurate, stable output over a wide temperature range. This series is
intended for use with non-corrosive, non-ionic working fluids such as air, dry gases and the like. A Sil-Gel die coating is
added for enhanced media protection.
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Standard Pressure Ranges
Device
DLV-005D
DLV-015D
DLV-030D
Operating Range
PSI
±5
± 15
± 30
± 60
0 to 5
0 to 15
0 to 30
0 to 60
0 to 15 psiA
0 to 30 psiA
0 to 60 psiA
600 to 1100 mbarA
A, B
Proof Pressure
PSI
20
40
120
200
20
60
120
200
60
120
200
60
kPa
140
415
830
1,380
140
415
830
1,380
415
830
1,380
415
Burst Pressure
PSI
40
120
200
200
40
120
200
200
120
200
200
120
kPa
275
830
1,380
1,380
275
830
1,380
1,380
830
1,380
1,380
830
Nominal Span
Counts
±6,553
±6,553
±6,553
±6,553
13,107
13,107
13,107
13,107
13,107
13,107
13,107
13,107
kPa
35
100
200
400
35
100
200
400
100
200
400
60 to 110 kPa
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DLV-060D
DLV-005G
DLV-015G
DLV-030G
DLV-060G
DLV-015A
DLV-030A
DLV-060A
DLV-611M
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Note A: Operating range in kPa is expressed as an approximate value.
Note B: Products are calibrated to operating range expressed in psi (except DLV-611M, which is calibrated to range in millibars).
Pressure Sensor Maximum Ratings
Supply Voltage (Vs)
Common Mode Pressure
6 Vdc
10 psig (70 kPa)
270 °C
Environmental Specifications
Temperature Ranges
Compensated:
Operating
Storage
Humidity Limits (non condensing)
Commercial
Industrial
Original On File
Lead Temperature (soldering 2-4 sec.)
0°C
to 70°C
-20°C to 85°C
-25°C to 85°C
-40°C to 125°C
0 to 95% RH
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Performance Characteristics for DLV Series - Commercial and Industrial Temperature Range
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A
ll pArAmeters Are meAsured At
3.3V ±5%
or
5.0V ±5% (
depending on selected VoltAge option
)
excitAtion
,
And At
25c,
unless otherwise specified
. p
ressure
meAsurements Are with positiVe pressure Applied to
port B.
Parameter
Output Span
xxxD
xxxG , xxxA
Min
-
-
Typ
±6,553
13,107
8,192
-
±0.5
±0.1
±0.1
±0.1
±0.1
Max
-
-
-
1,638
±1.0
-
-
-
±0.25
0.50
1.40
-
1.0
3.1
9.5
10.0
-
-
-
-
-
3.2
3.1
0.7
5.0
4.5
4.4
1.0
5.0
Units
Dec Count
Dec Count
Dec Count
Dec Count
%FSS
%FSS
%FSS
%FSS
%FSS
ms
ms
ms
Notes
1
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Offset Output
xxxD (at 0 PSIG)
-
xxxG (at 0 PSIG) & xxxA (at 0 PSIA), 611M (at 600mBarA)
Total Error Band
-
Span Temperature Shift
-
Offset Temperature Shift
Offset Warm-up Shift
Accuracy
Response Delay
Sleep - Wake Pressure
Sleep - Wake All
Power-On to First Reading Attempt
Update Rate
Fast
Noise Reduced
Low Power
Start-up Time
Offset Long Term Drift (One Year)
Digital Resolution
-
-
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2
3
3
4
6
5, 10
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-
0.40
-
1.10
6.0 + 1 update period -
-
-
-
-
-
-
12
-
-
-
-
-
-
-
-
-
-
0.40
1.30
6.5
-
±0.1
14
13
11
2
2.5
2.5
0.6
0.5
3.5
3.6
0.8
0.5
R
R
5
ms
ms
ms
ms
%FSS
bit
bit
8
bit
°C
5
mA
mA
mA
uA
5
mA
mA
mA
uA
5, 7
-
5
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Output Resolution
No Missing Codes
Temperature Output
Resolution
Overall Accuracy
Current Requirement (3.3V Option)
Fast
Noise Reduced
Low Power
Sleep (Idle)
Current Requirement (5.0 Option)
Fast
Noise Reduced
Low Power
Sleep (Idle)
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See the following page for performance characteristics table notes.
DLV Series Low Voltage Digital Pressure Sensors
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I2C / SPI Electrical Parameters for DLV Series
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Parameter
Input High Level
Input Low Level
Output Low Level
I2C Pull-up Resistor
Symbol
-
-
-
-
C
SDA
C
I2C_IN
Min
80.0
0
-
1000
-
-
Typ
-
-
-
-
-
-
Max
100
20.0
10.0
-
200
10.0
Units
% of Vs
% of Vs
% of Vs
Ω
pF
pF
Notes
5
5
5
5,9
5
I2C Load Capacitance on SDA, @ 400 kHz
I2C Input Capacitance (each pin)
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Specification Notes
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1: the spAn is the AlgeBrAic difference Between full scAle decimAl counts And the offset decimAl counts.
p
ressure output
t
rAnsfer
f
unction
−
½
×
()
2
14
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Where,
R
()
= 1.25 ×
½
Is the sensor 14 bit digital output.
Is the specified digital offset (gage/absolute, 611M = 1,638 and differential = 8,192)
Is the sensor Full Scale Span (gage = Full Scale Pressure, differential = 2 x Full Scale Pressure) in psi.
(For 611M, = 500 mBar).
For DLV-611M, replace 'psi' units with 'mbar'.
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()
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note
2: totAl error BAnd consists of offset And spAn temperAture And cAliBrAtion errors, lineAritY And pressure hYsteresis errors,
offset wArm-up shift And long term offset drift errors.
3: shift is relAtiVe to 25c.
4: shift is within the first hour of excitAtion Applied to the deVice.
5: pArAmeter is chArActeriZed And not 100% tested.
6: includes pressure hYsteresis, repeAtABilitY And Best-fir strAight line lineAritY, eVAluAted At 25c.
7: power-on time is time from power Being Applied to first AVAilABle pArt communicAtions.
8:
Temperature Output Transfer
note
note
note
note
note
note
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2
200
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note
note
9: A pull-up resistor is reQuired for correct i2c usAge. the minimum VAlue indicAted is for 5.0V or 3.3V operAtion.
10: following sensor power-up, the ApplicAtion must wAit At leAst the indicAted time Before Attempting to communicAte with the
sensor.
Figure 1 - Equivalent Circuit
Vs
SCL
I2C
SDA
INT
Gnd
Vs
SCLK
MISO
SS
Gnd
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SPI
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Device Options
The following is a list of factory programmable options. Consult the factory to learn more about the options.
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Interface
I2C and SPI interfaces are available. NOTE: SPI interface is only available with eight (8) lead packages.
Supply Voltage
Devices are characterized at either 3.3V or 5.0V depending on the options selected. It is suggested to
select the option that most closely matches the application supply voltage for best possible performance.
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Speed/Power
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There are four options of Speed/Power. These are Fast(F), Noise Reduced(N), Low Power(L) and Sleep
mode(S).
Fast Mode(F) Is the fastest operating mode where the device operates with continuous sampling at
the fastest internal speed.
Noise Reduced(N): Also operates with continuous samples however the ADC is set for over sampling
for noise reduction. The conversion times are resultantly longer than the Fast(F) mode however, there
is approximately 1/2 bit reduction in noise.
Low Power(L): Is similar to the Fast(F) mode with exception that the device uses an internal timer to
delay between pressure conversions. The internal timer time-out triggers the next conversion cycle.
The update rate is commensurately lower for this mode as a result.
Sleep(S): Is similar to the Low Power(L) mode however the trigger to initiate a sample comes from the
user instead of an internal timer. This is ideal for very low update rate applications that require low
power usage. It is also ideal for synchronizing the data conversions with the host microprocessor.
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Coating
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Parylene Coating: Parylene coating provides a moisture barrier and protection from some harsh media. The
DLV Series includes a Sil-Gel die coating for enhanced media protection. Parylene is available for all parts.
Consult the factory for applicability of the parylene option for the for the target application.
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DLV Series Low Voltage Digital Pressure Sensors
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Operation Overview
The DLV is a digital sensor with a signal path that includes a sensing element, a 14 bit analog to digital converter, a DSP
and an IO block that supports either an I2C or SPI interface (see Figure 1 below). The sensor also includes an internal
temperature reference and associated control logic to support the configured operating mode. The sensing element is
powered down while not being sampled to conserve power. Since there is a single ADC, there is also a multiplexer at
the front end of the ADC that selects the signal source for the ADC.
Figure 2 - DLV Essential Model
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Vs
Zero
2
1
0
T
o
Sensor
A
D
Sample
rawP/
rawT
Over
Sample
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Pressure
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DSP
Temperature
I/O
I2C/SPI
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P/T/Z
Select
Control
Logic
Wake
R
Gnd
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The ADC performs conversions on the raw sensor signal (P), the temperature reference (T) and a zero reference (Z) dur-
ing an ADC zero cycle. It also has an oversampling mode for a noise reduced output. A conversion cycle that is measuring
pressure is called a Normal cycle. A cycle where either a temperature measurement or zeroing is being performed is called a
Special cycle.
The DSP receives the converted pressure and temperature information and applies a multi-order transfer function to
compensate the pressure output. This transfer function includes compensation for span, offset, temperature effects of span,
temperature effects on offset and second order temperature effects on both span and offset. There is also linearity compen-
sation for all devices.
There are two effective operating modes of the sensor 1) Free Running and 2) Triggered. The control logic performs the
synchronization of the internal functions according the factory programmed Power/Speed option (see Table 1). The
Control Logic also determines the Delay between ADC samples, the regularity of the Special cycles and whether or not
the ADC performs the Over Sampling. Refer to Figure 2 for the communication model associated with the operating
modes listed below.
Free Running Mode: In the free running mode, conversion cycles are initiated internally at regular intervals. There
are three options available that operate in the Free Running mode (F, N and L). Two of these (F and N) run con-
tinuously while the third option (L) has an approximate 6 ms delay between conversion cycles. All three options
have Special cycles inserted at regular intervals to accomplish the ADC zeroing and temperature measurements.
Two of the options utilize oversampling. Refer to Table 1 for specific option controls.
Triggered Mode: In the Triggered Mode, a conversion cycle is initiated by the user (or host uP). There are two
availabe methods to wake the sensor from sleep mode. The first method (Wake All) is to wake the sensor and
perform all three measurement cycles (Z, T and P). This provides completely fresh data from the sensor. The
second method (Wake P) is to wake the sensor from sleep and only perform the pressure measurement (P).When
using this second method, it is up to the user to interleave Wake All commands at regular intervals to ensure there
is sufficiently up to date temperature information. Also, the Wake Pressure method is only available from the I2C
interface (not available using a SPI interface).
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