All Sensors DS-0300 Rev A

The DLVR 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. 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

• Medical Breathing

• Environmental Controls

• HVAC

• Industrial Controls

• Portable/Hand-Held Equipment

General Description

Applications

Features

DLVR Series Low Voltage Digital Pressure Sensors

Pressure Sensor Maximum Ratings Environmental Specications

Standard Pressure Ranges Equivalent Circuit

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Parameter Min Typ Max Units Notes

Oset Output @ Zero Di. Pressure -

Total Error Band 2

Oset Position Sensitivity (±1g) -

Oset Long Term Drift (One Year) -

Linearity, Hysteresis Error 6

Current Requirement (3.3V Option) 5

Performance Characteristics for DLVR Series - Commercial and Industrial Temperature Range

All pArAmeters Are meAsured At 3.3V ±5% or 5.0V ±5% (depending on selected VoltAge option) excitAtion And room temperAture unless otherwise specified.

pressure meAsurements Are with positiVe pressure Applied to port B.

See following page for performance characteristics table notes

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All Sensors DS-0300 Rev A

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Parameter Symbol Min Typ Max Units

Input High Level - 80.0 - 100 % of Vs

Input Low Level - 0 - 20.0 % of Vs

Output Low Level - - - 10.0 % of Vs

I2C Pull-up Resistor - 1000 - - Ω

I2C Load Capacitance on SDA, @ 400 kHz CSDA - - 200 pF

I2C Input Capacitance (each pin) CI2C_IN - - 10.0 pF

I2C / SPI Electrical Parameters for DLVR Series

Device Options

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All Sensors DS-0300 Rev A

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Triggered Mode - Wake All [(S)leep Option]

Internal Operation ADC (Z) ADC (T) ADC (P) DSP ADC (Z) ADC (T) ADC (P) DSP Sleep

New Data Available

I2C Read Data

Sleep

Triggered Mode - Wake Pressure [(S)leep Option]

Internal Operation ADC (P) DSP ADC (P) DSP Sleep

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All Sensors DS-0300 Rev A

the 2 Status bits followed by the 14-bit the pressure value. The third byte provides the 8 most signicant bits of the mea-

sured temperature; the fourth byte provides the 3 least signicant bits of temperature, followed by 5 bits of undened

ller data. With either interface, the host may terminate the transfer after receiving the rst two bytes of data from the

sensor, or following the third byte (if just the most-signicant 8 bits of temperature are needed). Refer to Table 2 for the

overall data format of the sensor. Table 3 shows the Status Bit denition.

Bit Denitions:

Status (S): Normal/command / busy / diagnostic

Pressure (P): Digital pressure reading

Temperature (T): Compensated temperature reading

Table 2 - Output Data Format

START condition (ST): A HIGH to LOW transition of SDA line while the clock (SCL) is HIGH is interpreted as

START condition. START conditions are always set by the master. Each initial request for a pressure value has to

begin with a START condition.

Slave address (An): The I²C-bus requires a unique address for each device. The DLVR sensor has a precong-

ured slave address (0x28). After setting a START condition the master sends the address byte containing the

7 bit sensor address followed by a data direction bit (R/W). A "0" indicates a transmission from master to slave

(WRITE), a "1" indicates a datarequest (READ).

Acknowledge (A or N): Data is transferred in units of 8 bits (1 byte) at a time, MSB rst. Each data-receiving

device, whether master or slave, is required to pull the data line LOW to acknowledge receipt of the data. The

Master must generate an extra clock pulse for this purpose. If the receiver does not pull the data line down, a

ues. The transmission may be halted by the host after any of the bytes by responding with a NACK.

STOP condition (P): LOW to HIGH transition of the SDA line while clock (SCL) is HIGH indicates a STOP condi-

tion. STOP conditions are always generated by the master.

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I2C Communications Overview (Cont’d)

Figure 3 - I2C Communication Diagram

Figure 3 illustrates the sequence of signals set by both the host and the sensor for each command. Note that for the Da-

taRead command, the host has the option of responding to the second or third bytes of data with a NACK instead of ACK.

This terminates the data transmission after the pressure data, or after the pressure data and upper byte of temperature,

have been transmitted. See Figure 6 for the I2C timing details.

1. Start All ( to wake sensor from Sleep mode, Zero ADC, read Temperature and read Pressure )

2. Start Pressure ( to wake sensor from Sleep mode and read Pressure only )

I ST A6 A5 A4 A3 A2 A1 A0 W SP I

Set by sensor: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

a) Set by bus master, to stop transfer after pressure data received: - - - - - - - - - - - - - - - - - - - - - - -

b) Set by bus master, to stop transfer after first temperature data byte received: - - - - - - - - - - - - -

Set by sensor ( all 12 bits of temperature plus padding bits ): - - - - - - - - - - - - - - - - - - - - - - - - -

D15 …D8 D7 …D0

Bus states Sensor Address

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All Sensors DS-0300 Rev A

I2C Command Sequence

quence diers slightly. See Figure 3 for details of the three I2C commands.

Fast, Noise Reduced or Low-power Conguration

The part enters Free Running mode (see table 1) after power-up: it performs an initial complete measurement,

writes the calculated data to the output registers, sets the INT pin high, then goes to sleep. After a delay deter-

mined by the update rate option, the part will wake up, perform measurements, update the output registers,

then go back to sleep. DataRead is the only command recognized; as with the Micropower conguration, if

the INT pin is ignored, the host processor can repeat this command until the Status bits indicate an updated

reading.

Sleep Conguration

The part enters Triggered mode (see table 1) after power-up, and waits for a command from the bus master. If

Depending on the application, pressure measurements may be performed by sending the StartPressure com-

mand, which only measures the pressure value and uses previously measured temperature data in calculating

the compensated output value. This presents the result faster (in about 1/3 the delay time) than the StartAll

command. This can be a useful method to synchronize the sensor with the hose controller as well as attain-

ing the fastest overall response time without Special cycles occuring at unwanted times. The system designer

should determine the interval required for sending StartAll commands, necessary to refresh the temperature

1. Sending a Start condition, then a Stop condition, without any transitions on the CLK line, creates a com-

munication error for the next communication, even if the next start condition is correct and the clock pulse is

applied. A second Start condition must be set, which clears the error and allows communication to proceed.

2. The Restart condition—a falling SDA edge during data transmission when the CLK clock line is still high—

All Sensors DS-0300 Rev A

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Product Labeling

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 circuit described