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DLH Series Low Voltage Digital Pressure Sensors
Features
• 5 to 60 inH2O Pressure Ranges
• 1.68V to 3.6V Supply Voltage Range
• I2C or SPI Interface (Automatically Selected)
• Better than 0.25% Accuracy
• High Resolution 16/17/18 bit Output
Applications
General Description
• Medical Breathing
• Environmental Controls
• HVAC
• Industrial Controls
• Portable/Hand-Held Equipment
The DLH Series Mini Digital Output Sensor is based on All Sensors’ CoBeam2 TM Technology. This reduces package stress
susceptibility, resulting in improved overall long term stability and vastly improves the position sensitivity.
The digital interface 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.
Standard Pressure Ranges
Equivalent Circuit
Device
DLH-L05D
DLH-L10D
DLH-L20D
DLH-L30D
DLH-L60D
DLH-L05G
DLH-L10G
DLH-L20G
DLH-L30G
DLH-L60G
Operating Range
±5 inH2O
±10 inH2O
±20 inH2O
±30 inH2O
±60 inH2O
0 to 5 inH2O
0 to 10 inH2O
0 to 20 inH2O
0 to 30 inH2O
0 to 60 inH2O
Proof Pressure
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
200 inH2O
Burst Pressure Nominal Span
300 inH2O ±0.4 * 224 counts
300 inH2O ±0.4 * 224 counts
500 inH2O ±0.4 * 224 counts
500 inH2O ±0.4 * 224 counts
800 inH2O ±0.4 * 224 counts
300 inH2O 0.8 * 224 counts
300 inH2O 0.8 * 224 counts
500 inH2O 0.8 * 224 counts
500 inH2O 0.8 * 224 counts
800 inH2O 0.8 * 224 counts
I2C
- OR -
SPI
Vs
SCL
SDA
EOC
Gnd
Vs
SCLK
MISO
MOSI
/SS
EOC
Gnd
Pressure Sensor Maximum Ratings
Environmental Specifications
Supply Voltage (Vs)
Common Mode Pressure
Lead Temperature (soldering 2-4 sec.)
3.63 Vdc
10 psig
270 °C
Temperature Ranges
Compensated:
Operating
Storage
Commercial
Industrial
Humidity Limits (non condensing)
0°C to 70°C
-20°C to 85°C
-25°C to 85 °C
-40°C to 125 °C
0 to 95% RH
All Sensors
DS-0355 Rev B
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Performance Characteristics for DLH Series - Commercial and Industrial Temperature Range
All parameters are measured at 3.3V ±5% excitation and 25C unless otherwise specified (Note 9). Pressure measurements are with positive
pressure applied to PORT B.
Parameter
Min Typ Max Units Notes
Output Span (FSS)
LxxD
LxxG
- ±0.4 * 224 - Dec Count
-
0.8 * 224
- Dec Count
1
Offset Output @ Zero Diff. Pressure (OSdig)
LxxD
LxxG
- 0.5 * 224 - Dec Count
- 0.1 * 224 - Dec Count
Total Error Band
L01x, L02x
-
±0.75
±1.5
%FSS
L05x, L10x, L20x, L30x, L60x
-
±0.50
±1.0
%FSS
Span Temperature Shift
- ±0.25 - %FSS
-
2
3
Offset Temperature Shift
-
±0.25
-
%FSS
3
Offset Warm-up Shift
- ±0.20 - %FSS 4
Offset Position Sensitivity (±1g)
-
±0.10
-
%FSS
-
Offset Long Term Drift (One Year)
-
±0.30
-
%FSS
-
Linearity, Hysteresis Error
6
LxxD
- ±0.25 - %FSS
LxxG
- ±0.10 - %FSS
Pressure Digital Resolution - No Missing Codes
16-bit Option
15.3 15.5
-
bit
17-bit Option
16.3 16.5
-
bit
18-bit Option
17.0 17.5
-
bit
-
Temperature Output -
Resolution
- 16 - bit
Overall Accuracy
- 2 - °C
Supply Current Requirement
During
During
Power On
AIDdceletliavSyet aSttea(tIeC(CICIdlCe)A ctive)
- 1.5 2.0 mA
-
100 250
nA
- - 2.5 ms
5, 7, 8
5
Data Update Time (tDU) (see table below)
ms 5, 7
See the following page for performance characteristics notes.
DLH Series Low Voltage Digital Pressure Sensors
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I2C / SPI Electrical Parameters for DLH Series
Parameter
Symbol Min Typ Max Units Notes
Input High Level
-
80.0 -
100 % of Vs
5
Input Low Level
-
0
-
20.0
% of Vs
5
Output Low Level
-
-
-
10.0
% of Vs
5
I2C Pull-up Resistor
I2C Load Capacitance on SDA, @ 400 kHz
-
1000
-
-
5
  CSDA - - 200 pF 5
I2C Input Capacitance (each pin)
CI2C_IN - - 10.0 pF 5
  I2C Address
41
decimal
   Pressure Output Transfer Function
�������������� � ��2� � �������2�������� � ���������
Where: 
������� 
�����  
��������� 
Is the sensor 24bit digital output. 
 
Is the specified digital offset  
For Gage Operating Range sensors:   
For Differential Operating Range sensors: 
 
0.1 * 224 
0.5 * 224 
The sensor Full Scale Span in inches H2O 
For Gage Operating Range sensors:    Full Scale Pressure 
For Differential Operating Range sensors:   2 x Full Scale Pressure. 
 
 
   Temperature Output Transfer Function   
 
 
 
  Where: 
����������� ��� � �����2����∗ 125� � �� 
������� 
The sensor 24bit digital temperature output. 
(Note that only the upper 16 bits are significant) 
 
Specification Notes
note 1: THE SPAN IS THE ALGEBRAIC DIFFERENCE BETWEEN FULL SCALE DECIMAL COUNTS AND THE OFFSET DECIMAL COUNTS.
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 3: SHIFT IS RELATIVE TO 25C.
note 4: SHIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE.
note 5: PARAMETER IS CHARACTERIZED AND NOT 100% TESTED.
note 6: MEASURED AT ONE-HALF FULL SCALE RATED PRESSURE USING BEST STRAIGHT LINE CURVE FIT.
note 7: DATA UPDATE TIME IS EXCLUSIVE OF COMMUNICATIONS, FROM COMMAND RECEIVED TO END OF BUSY STATUS. THIS CAN BE OBSERVED AS EOC PIN
LOW- STATE DURATION.
note 8: AVERAGE CURRENT CAN BE ESTIMATED AS : ICCIdle + (tDU / Reading Interval) * ICCActive). REFER TO FIGURE 2 FOR ACTIVE AND IDLE CONDITIONS OF THE
SENSOR (THE ACTIVE STATE IS WHILE EOC PIN IS LOW).
note 9: THE SENSOR IS CALIBRATED WITH A 3.3V SUPPLY HOWEVER, AN INTERNAL REGULATOR ALLOWS A SUPPLY VOLTAGE OF 1.68V TO 3.6V TO BE USED
WITHOUT AFFECTING THE OVERALL SPECIFICATIONS. THIS ALLOWS DIRECT OPERATION FROM A BATTERY SUPPLY.
All Sensors
DS-0355 Rev B
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Device Ordering Options
Output Resolution
Calibrated output resolution can be ordered to be 16, 17, or 18 bits.
Higher resolution results in slower update times; see the Data Update Time in the Performance Characteristics table.
Coating
Parylene Coating: Parylene coating provides a moisture barrier and protection form some harsh media. Consult factory
for applicability of Parylene for the target application and sensor type.
Operation Overview
The DLH is a digital sensor with a signal path that includes a sensing element, a variable- 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. 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 - DLH Essential Model
The ADC performs conversions on the raw sensor signal (P), the temperature reference (T) and a zero reference (Z)
during the ADC measurement 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 on
span, temperature 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.
Sensor Commands: Five Measurement commands are supported, returning values of either a single pressure /
temperature reading or an average of 2, 4, 8, or 16 readings. Each of these commands wakes the sensor from Idle state
into Active state, and starts a measurement cycle. For the Start-Average commands, this cycle is repeated the
appropriate numper of times, while the Start-Single command performs a single iteration. When the DSP has
completed calculations and the new values have been made available to the I/O block, the sensor returns to Idle state.
The sensor remains in this low-power state until another Measurement command is received.
After completion of the measurement, the result may then be read using the Data Read command. The ADC and DSP
remain in Idle state, and the I/O block returns the 7 bytes of status and measurement data. See Figure 2, following. At
any time, the host may request current device status with the Status Read command.
See Table 1 for a summary of all commands.
For optimum sensor performance, All Sensors recommends that Measurement commands be issued at a fixed interval
by the host system. Irregular request intervals may increase overall noise on the output.
Furthermore, if reading intervals are much slower than the Device Update Time, using the Averaging commands is
suggested to reduce offset shift. This shift is constant with respect to time interval, and may be removed by the applica-
tion. For longer fixed reading intervals, this shift may be removed by the factory on special request.
I/O Interface Configuration: The sensor automatically selects SPI or I2C serial interface, based on the following protocol:
If the /SS input is set low by the host (as occurs during a SPI command transaction), the I/O interface will remain
configured for SPI communications until power is removed. Otherwise, once a valid device address and command have
been received over the I2C interface, the I/O interface will remain configured for I2C until power is removed.
NOTE: The four-pin (SIP) packages only support the I2C interface.
DLH Series Low Voltage Digital Pressure Sensors
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Operation Overview
Figure 2 - DLH Communication Model
Start-Single Command
Command
Start-Single
Internal State
Idle
Interal Operation
Idle
New Data Available
EOC
Start-Average2 / 4 / 8 / 16 Commands (Auto Averaging)
Command
Start-Average2/4/8/16
Internal State
Interal Operation
New Data Available
EOC
Idle
Idle
Active
ADC (Temp, Zero, Pressure)
DSP
Data Read
Idle
Idle
Start-Single
Active
ADC (Temp, Zero, Pressure)
Idle
DSP Idle
Active
ADC (Temp, Zero, Pressure)1
ADC (Temp, Zero, Pressure)n
DSP
Data Read
Idle
Idle
Start-Average2/4/8/16
Active
ADC (T, Z, P)…
Digital Interface Command Formats
When requesting the start of a measurement, the command length for I2C is 1 byte, for SPI it is 3 bytes.
When requesting sensor status over I2C, the host simply performs a 1-byte read transfer.
When requesting sensor status over SPI, the host must send the Status Read command byte while reading 1 byte.
When reading sensor data over I2C, the host simply performs a 7-byte read transfer.
When reading sensor data over SPI, the host must send the 7-byte Data Read command while reading the data.
SENDING UNDOCUMENTED COMMANDS TO SENSOR WILL CORRUPT CALIBRATION AND IS NOT COVERED BY WARRANTY.
See Table 1 below for Measurement Commands, Sensor Data read and Sensor Status read details.
Table 1 - DLH Sensor Command Set
Measurement Commands
Description
SPI ( 3 bytes )
Start-Single
0xAA 0x00 0x00
Start-Average2
0xAC 0x00 0x00
Start-Average4
0xAD 0x00 0x00
Start-Average8
0xAE 0x00 0x00
Start-Average16 0xAF 0x00 0x00
I2C ( 1 byte)
0xAA
0xAC
0xAD
0xAE
0xAF
Read Sensor Data
I2C Read of 7 bytes from device
Read of 7 bytes from device
SPI Host must send [0xF0], then 6 bytes of [0x00] on MOSI
Sensor Returns 7 bytes on MISO
Read Sensor Status
I2C Read of 1 byte from device.
Read of 1 byte from device
SPI Host must send [0xF0] on MOSI
Sensor Returns 1 byte on MISO
All Sensors
DS-0355 Rev B
Page 5