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Features • 0.5 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 • Medical Breathing • Environmental Controls • HVAC • Industrial Controls General Description • Portable/Hand-Held Equipment The DLHR Series Mini Digital Output Sensor is based on All Sensors' CoBeam²™™Technology. This reduces package stress susceptibility, resulting in improved overall long term stability and vastly improves the position sensitivity. SENSOR The digital interface eases integration of the sensors into a wide range of process control and measurement systems, allowing direct connection to serial communications channels. For battery-powered systems, the sensors can enter very low-power mode 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.
E www.allsensors. 2079 F 408 225 108 225 4314 35 Vineyard Blvd. Morgan Hill, CA 950 All Sensors DS-0350 Rev B able of Contents gned Original Performance Characteristics for DLHR Series - Commercial and Industrial Temperature Range
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Poutdig = OSaig) × FSS(inH20) Pressure(inH,0) = 1.25 × Where: Poutdig Is the sensor 24-bit digital output.
Is the specified digital offset For Gage Operating Range sensors: For Differential Operating Range sensors: 0.1 * 2 4 0.5 * 2²4 FSS(inH 20 ) 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 Toutaio Temperature (°C) = 40 SENSO Signed Original On File Where: Tout aig The sensor 24-bit digital temperature output. (Note that only the upper 16 bits are significant) Specification Notes κοτ 1:  THE SPAN IS THE ALGEBRAIC DIFFERENCE BETWEEN FULL SCALE DECIMAL COUNTS AND THE OFFSET DECIMAL COUNTS. κοτ 2:  TOTAL ERROR BAND CONSISTS OF OFFSET AND SPAN TEMPERATURE AND CALIBRATION ERRORS, LINEARITY AND PRESSURE HYSTERESIS ERRORS, OFFSET WARM-UP SHIFT, OFFSET POSITION SENSITIMITY AND LONG TERM OFFSET DRIFT ERRORS. SHIFT IS RELATIVE TO 2SC. SHIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE. NOTE 4: PARAMETER IS CHARACTERIZED AND NOT 100% TESTED. INOTE S: MEASURED AT ONE-HALF FULL SCALE RATED PRESSURE USING BEST STRAIGHT LINE CURVE FIT. NOTK 6: DATA UPDATE TIME IS EXCLUSIVE OF COMMUNICATIONS, FROM COMMAND RECEIVED TO END OF BUSY STATUS. THIS CAN BE OBSERVED AS EOC PIN NOTE 7: LOW- STATE DURATION. AVERAGE CURRENT CAN BE ESTIMATED AS : ICCu , etc.y / Reaceve lvtave.) * ICCActive. REFER TO FIGURE 2 FOR ACTIVE AND IDLE CONDITIONS OF THE NOTI & SENSOR (THE ACTIVE STATE IS WHILE EOC PIN IS LOW). THE SENSOR IS CALIBRATED WITH A 3.3V SUPPLY HOWEVER, AN INTERNAL REGULATOR ALLOWS A SUPPLYVOLTAGE OF 1.68VTO 3.6V TO BE USED WITHOUT AFFECTING THE OVERALL SPECIFICATIONS. THIS ALLOWS DIRECT OPERATION FROM A BATTERY SUPPLY. All Sensors DS-0350 Rev B Page 3 F 408 225 2079 08 225 4314 Vineyard Blvd. Morgan Hill, CA ginal On Fil able of Contents 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 DLHR 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 tem- perature 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. 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: lf 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. DLHR Series Low Voltage Digital Pressure Sensors O Isuigino bougin A uO IsuiginO bəugis 'U Page 4 Signed Origina Operation Overview Figure 2 - DLHR Communication Model
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 - DLHR Sensor Command Set
Read Sensor Data I2C  Read of 7 bytes from device SPI Read of 7 bytes from device Host must send [0xF0], then 6 bytes of [0x00] on MOSI Sensor Returns 7 bytes on MISO
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Digital Interface Data Format
For either type of digital interface, the format of data returned from the sensor is the same. The first byte consists of the Status Byte followed by a 24-bit unsigned pressure value and a 24-bit unsigned temperature value. Unused bits beyond the calibrated bit width are undefined, and may have any value. See the Pressure Output Transfer Function and Temperature Output Transfer Function definitions on page 3 for converting to pressure and temperature. Refer to Table 2 for the overall data format of the sensor. Table 3 shows the Status Byte definition. Note that a completed reading without error will return status 0x40. Table 2 - Output Data Format
Table 3- Status Byte Definition

I2C Interface
l2C Command Sequence The part enters Idle state after power-up, and waits for a command from the bus master. Any of the five Measurement commands may be sent, as shown in Table 1. Following receipt of one of these command bytes, the EOC pin is set to Low level, and the sensor Busy bit is set in the Status Byte. After completion of measurement and calculation in the Active state, compensated data is written to the output registers, the EOC pin is set high, and the processing core goes back to Idle state. The host processor can then perform the Data Read operation, which for I2C is simply a 7-byte Device Read. If the EOC pin is not monitored, the host can poll the Status Byte by repeating the Status Read command, which for I2C is a one-byte Device Read. When the Busy bit in the Status byte is zero, this indicate that valid data is ready, and a full Data Read of all 7 bytes may be performed.
DO NOT SEND COMMANDS TO SENSOR OTHER THAN THOSE DEFINED IN TABLE 1.
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may be read from the sensor. The Data bytes of 0x00). NOTE: Sending commands that are not defined in Table 1 will corrupt sensor operation. SPI Bus Communications Overview The sequence of bits and bus signals are shown in the following illustration (Figure 4). Refer to Figure 5 in the Interface Timing Diagram section for detailed timing data. Figure 4 - SPI Communications Diagram MOSI　Don't Care Si S MISO S$ Data Read Command SCLK ΛυΛυΛυΛυι… o o o o o o o o o o o Don't Care to MOSI Hi-Z MISO Syst S Tool Too T. T. To...To (Temperature Hi-Z DLHR Series Low Voltage Digital Pressure Sensors Page 8 olif nO Iruigi10 bousis 'U i'l O  pougis バoliti a0 IsuigitO bou3 SS Signed Original igi10 par SENSOR T E www.allsensors.com F 408 225 2079 408 225 4314 35 Vineyard Blvd. Morgan Hill, CA 950 Interface Timing Diagrams Figure 5 - SPI Timing Diagram
Figure 6 - I2C Timing Diagram
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 Signed Original On Fi Table of Contents igned Original How to Order Refer to Table 4 for configuring a standard base part number which includes the pressure range, package and temperature range. Table 5 shows the available configuring options. The option identifier is required to com- plete the device part number. Refer to Table 6 for the available device packages. Example P/N with options: DLHR-L02D-E1NS-C-NAV6 Table 4 - How to configure a base part Table 5 - How to configure an option identifier
Table 6 - Available E-Series Package Configurations
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1)Dimensions are in inches [mm]
2)For suggested pad layout, see drawing: PAD-01 olin uO InniginO bo olif nO IruiginO bougis 'U olifi no Iruigino bougis 'U gito bougis in gned Original Or ned Original On riginal On I DLHR Series Low Voltage Digital Pressure Sensors Page 12 Table of Contents ww.allocuses.com" A Signed Original On F www.alsow.com.
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1) Dimensions are in inches [mm] 2) For suggested pad layout, see drawing: PAD-03 DLHR Series Low Voltage Digital Pressure Sensors Page 14 olit aO IndigitO b olif uO IsuiginO bougis 'U olifi uo Iruigino bougis 'U gitO bougis V riginal On I " Signed Original Ruigi10 bo Package Drawings (Cont'd) All Sensors DS-0350 Rev B Δ ww.allsow.cccc"
 Signed Original On File屋www.amon.com- Signed On File Al riginal On File SENSOR! L E www.allsensors. F 408 225 2079 408 225 4314 035 Vineyard Blvd. Morgan Hill, CA 950 24 Page 15 Table of Contents gned Original olif ao Indigino b Suggested Pad Layout Product Labeling All Sensors DLHR-L02D E1NS-C NAV6 R16J21-14 Company Part Number Lot Number Example Device Label olif uO IsuiginO bougis 'U uO IndiginO bougin ' ginO bougin i All Sensors reserves the right to make changes to any products herein. All Sensors does not assume any liability arising out of the application or use of any product or circ herein, neither does it convey any license under its patent rights not the rights of others. DLHR Series Low Voltage Digital Pressure Sensors Page 16 Table of Contents