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DLVR-L30G Datasheet(Fiches technique) 7 Page - All Sensors Corporation

Numéro de pièce DLVR-L30G
Description  DLVR Series Low Voltage Digital Pressure Sensors
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Fabricant  ASC [All Sensors Corporation]
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All Sensors
DS-0300 Rev A
Digital Interface Data Format
For either type of digital interface, the format of data returned from the sensor is the same. The first 16 bits consist of
the 2 Status bits followed by the 14-bit the pressure value. The third byte provides the 8 most significant bits of the mea-
sured temperature; the fourth byte provides the 3 least significant bits of temperature, followed by 5 bits of undefined
filler data. With either interface, the host may terminate the transfer after receiving the first two bytes of data from the
sensor, or following the third byte (if just the most-significant 8 bits of temperature are needed). Refer to Table 2 for the
overall data format of the sensor. Table 3 shows the Status Bit definition.
Bit Definitions:
Status (S): Normal/command / busy / diagnostic
Pressure (P): Digital pressure reading
Temperature (T): Compensated temperature reading
Table 2 - Output Data Format
Table 3- Status Bit Definitions
I2C Interface
I2C Communications Overview
The I2C interface uses a set of signal sequences for communication. The following is a description of the supported
sequences and their associated pneumonic. Refer to Figure 3 for the associated usage of the following signal sequences.
Bus not Busy (I): During idle periods both data line (SDA) and clock line (SCL) remain HIGH.
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 preconfig-
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 first. 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
NACK condition exists, and the slave transmitter becomes inactive. The master determines whether to send
the last command again or to set the STOP condition, ending the transfer.
DATA valid (Dn): State of data line represents valid data when, after a START condition, data line is stable for
duration of HIGH period of clock signal. Data on line must be changed during LOW period of clock signal.
There is one clock pulse per data bit.
DATA operation: The sensor starts to send 4 data bytes containing the current pressure and temperature val-
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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