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DLVR Series Low Voltage Digital Pressure Sensors
Features
• 0.5 to 60 inH2O Pressure Ranges
• 3.3V Supply Voltage Standard / 5V Option
• I2C Standard Interface / SPI Interface Option
• Better than 1.0% Accuracy Over Temperature Typical
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Applications
• Medical Breathing
• Environmental Controls
• HVAC
• Industrial Controls
• Portable/Hand-Held Equipment
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General Description
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The DLVR Series Mini Digital Output Sensor is based on All Sensors’ CoBeam
2 TM
Technology. This reduces package stress
susceptibility, resulting in improved overall long term stability. The technology also vastly improves position sensitivity
compared to single die devices.
The supply voltage options ease integration of the sensors into a wide range of process control and measurement sys-
tems, allowing direct connection to serial communications channels. For battery-powered systems, 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 protective parylene
coating is optionally available for moisture/harsh media protection.
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Standard Pressure Ranges
Device
DLVR-F50D
DLVR-L01D
DLVR-L02D
Operating Range
±0.5 inH2O
±1 inH2O
±2 inH2O
±5 inH2O
±10 inH2O
±20 inH2O
±30 inH2O
±60 inH2O
0 to 1 inH2O
0 to 2 inH2O
0 to 5 inH2O
0 to 10 inH2O
0 to 20 inH2O
0 to 30 inH2O
0 to 60 inH2O
Proof Pressure
100 inH2O
100 inH2O
100 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
100 inH2O
100 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
Burst Pressure
300 inH2O
300 inH2O
300 inH2O
300 inH2O
300 inH2O
500 inH2O
500 inH2O
800 inH2O
300 inH2O
300 inH2O
300 inH2O
300 inH2O
500 inH2O
500 inH2O
800 inH2O
Nominal Span
±6,553 counts
±6,553 counts
±6,553 counts
±6,553 counts
±6,553 counts
±6,553 counts
±6,553 counts
±6,553 counts
13,107 counts
13,107 counts
13,107 counts
13,107 counts
13,107 counts
13,107 counts
13,107 counts
Equivalent Circuit
Vs
SCL
I2C
SDA
INT
Gnd
Vs
SPI
Option
SCLK
MISO
SS
Gnd
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DLVR-L05D
DLVR-L10D
DLVR-L20D
DLVR-L30D
DLVR-L60D
DLVR-L01G
DLVR-L02G
DLVR-L05G
DLVR-L10G
DLVR-L20G
DLVR-L30G
DLVR-L60G
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Pressure Sensor Maximum Ratings
Supply Voltage (Vs)
Common Mode Pressure
6 Vdc
10 psig
270 °C
Environmental Specifications
Temperature Ranges
Compensated:
Operating
Storage
Humidity Limits (non condensing)
Commercial
Industrial
0°C
to 70°C
-20°C
to 85°C
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Lead Temperature (soldering 2-4 sec.)
-25°C to 85 °C
-40°C to 125 °C
0 to 95% RH
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All Sensors
DS-0300 Rev D
Page 1
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Performance Characteristics for DLVR 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
25°c
unless otherwise specified
. p
ressure
meAsurements Are with positiVe pressure Applied to
port B.
Parameter
Output Span
LxxD, FxxD
LxxG
Min
-
-
Typ
±6,553
13,107
8,192
1,638
±0.60
±0.50
±0.30
±0.5
±0.2
±0.5
±0.2
±0.25
±0.15
±0.10
±0.05
±0.25
±0.15
±0.30
±0.25
±0.10
0.40
1.10
-
0.40
1.30
6.5
14
13
11
2
3.5
3.6
0.72
0.5
5.0
5.2
1.1
0.5
Max
-
-
Units
Dec count
Dec count
Notes
1
Offset Output @ Zero Diff. Pressure
LxxD, FxxD
LxxG
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
6.0 + 1 update period
-
-
-
-
12
-
-
-
-
-
-
-
-
-
-
-
-
±1.5
±1.0
±0.75
-
-
-
-
-
-
-
-
-
-
-
-
-
0.50
1.40
-
1.0
3.1
9.5
-
-
-
-
4.3
4.5
0.90
5.0
6.0
6.2
1.3
5.0
Dec count
Dec count
Total Error Band
2
%Span
%Span
%Span
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F50D
L01x, L02x
L05x, L10x, L20x, L30x, L60x
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Span Temperature Shift
F50D, L01x, L02x
L05x, L10x, L20x, L30x, L60x
%FSS
%FSS
3
Offset Temperature Shift
F50D, L01x, L02x
L05x, L10x, L20x, L30x, L60x
%FSS
%FSS
3
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Offset Warm-up Shift
F50D, L01x, L02x
L05x, L10x, L20x, L30x, L60x
%FSS
%FSS
4
Offset Position Sensitivity (±1g)
F50D, L01x, L02x
L05x, L10x, L20x, L30x, L60x
%FSS
%FSS
-
Offset Long Term Drift (One Year)
F50D, L01x, L02x
L05x, L10x, L20x, L30x, L60x
%FSS
%FSS
-
Linearity, Hysteresis Error
6
%FSS
%FSS
%FSS
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F50D
LxxD
LxxG
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Response Delay
Sleep - Wake Pressure
Sleep - Wake All
Power-On to First Reading Attempt
ms
ms
ms
5, 9
Update Rate
Fast
Noise Reduced
Low Power
ms
ms
ms
5
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Digital Resolution
Output Resolution
No Missing Codes
bit
bit
-
Temperature Output
Resolution
Overall Accuracy
bit
°C
7
Current Requirement (3.3V Option)
Fast
Noise Reduced
Low Power
Sleep (Idle)
Fast
Noise Reduced
Low Power
Sleep (Idle)
mA
mA
mA
uA
mA
mA
mA
uA
5
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Current Requirement (5.0 Option)
5
See following page for performance characteristics table notes
DLVR Series Low Voltage Digital Pressure Sensors
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I2C / SPI Electrical Parameters for DLVR Series
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Parameter
Input High Level
Input Low Level
Output Low Level
I2C Pull-up Resistor
I2C Load Capacitance on SDA, @ 400 kHz
I2C Input Capacitance (each pin)
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
5,8
5
5
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Specification Notes
note
DLVR Transfer
Functions
1: the spAn is the AlgeBrAic difference Between full scAle decimAl counts And the offset decimAl counts.
NOTE 1: Pressure Output Transfer Function:
2
Where,
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Is the
sensor
14 bit digital
output.
Is the specified digital
offset
(gage = 1,638 and
differential
= 8,192)
Is the
sensor
Full Scale Span in inH2O (gage = Full Scale Pressure, differential = 2
x Full Scale Pressure)
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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,
offset position sensitiVitY And long term offset drift errors.
NOTE 2: Temperature Output Transfer Function:
note
note
note
note
note
3: shift is relAtiVe to 25c.
5: pArAmeter is chArActeriZed And not 100% tested.
7: temperAture output conVersion function:
4: shift is within the first hour of excitAtion Applied to the deVice.
2
200
6: meAsured At one-hAlf full scAle rAted pressure using Best strAight line curVe fit.
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200
(℃) =
×
½
11
½ −
50
2
−
1
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note
note
8: A pull-up resistor is reQuired for correct i2c usAge. the minimum VAlue indicAted is for 5.0V or 3.3V operAtion.
9: following sensor power-up, the ApplicAtion must wAit At leAst the indicAted time Before Attempting to communicAte with the sensor.
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All Sensors
DS-0300 Rev D
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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).
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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 requirelow
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 form some harsh media. Con-
sult factory for applicability of Parylene for the target application and sensor type.
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DLVR Series Low Voltage Digital Pressure Sensors
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Operation Overview
The DLVR 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 1 - DLVR Essential Model
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Vs
Zero
2
1
0
T
o
Sensor
A
D
Sample
rawP/
rawT
Over
Sample
Enable
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) during 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 com-
pensate the pressure output. This transfer function includes compensation for span, offset, temperature effects on span, tem-
perature effects on offset and second order temperature effects on both span and offset. There is also linearity compensation
for gage devices and front to back linearity compensation for differential 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 per-
forms 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 continuously 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 available
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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