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What is SDP510?

This electronic component, produced by the manufacturer "SENSIRION", performs the same function as "Low-cost Digital Differential Pressure Sensor".


SDP510 Datasheet PDF - SENSIRION

Part Number SDP510
Description Low-cost Digital Differential Pressure Sensor
Manufacturers SENSIRION 
Logo SENSIRION Logo 


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SDP600 Series (SDP6xx/5xx)
Low-cost Digital Differential Pressure Sensor
Accuracy better than 0.2% FS near zero
Digital output (I2C)
Excellent repeatability, even below 10 Pa
Calibrated and temperature compensated
Excellent long-term stability
Flow measurement in bypass configuration
Product Summary
The SDP600 sensor family is Sensirion’s series of digital
differential pressure sensors designed for high-volume
applications. They measure the pressure of air and non-
aggressive gases with superb accuracy and no offset drift.
The sensors cover a pressure range of up to ±500 Pa
(±2 inch H2O / ±5 mbar) and deliver outstanding accuracy
even at the bottom end of the measuring range.
The SDP600 series operates from a 3.3V supply voltage
and features a digital 2-wire interface, which makes it easy
to connect directly to a microprocessor. The signal is
internally linearized and temperature compensated.
The outstanding performance of these sensors is based
on Sensirion’s patented CMOSens® sensor technology,
which combines the sensor element, signal processing
and digital calibration on a tiny microchip. The differential
pressure is measured by a thermal sensor element using
flow-through technology. Compared with membrane-
based sensors, the SDP600 features an extended
dynamic range, better long-term stability, and improved
repeatability, especially near zero.
The well-proven CMOS technology is perfectly suited for
high-quality mass production and is the ideal choice for
demanding and cost-sensitive OEM applications.
Applications
Medical
HVAC
Automotive
Process automation
Burner control
Sensor chip
The SDP600 series features a fourth-generation silicon
sensor chip called SF04. In addition to a thermal mass
flow sensor element, the chip contains an amplifier, A/D
converter, EEPROM memory, digital signal processing
circuitry, and interface. The highly sensitive chip requires
only a minuscule amount of gas flow through the sensor.
OEM options
A variety of custom options can be implemented for high-
volume OEM applications. Ask us for more information.
www.sensirion.com
Version 1.9 July 2015
1/10

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SDP510 equivalent
3.4 Data transfer format
Data is transferred in byte packets in the I2C protocol,
which means in 8-bit frames. Each byte is followed by an
acknowledge bit. Data is transferred with the most
significant bit (MSB) first.
A data transfer sequence is initiated by the master
generating the Start condition (S) and sending a header
byte. The I2C header consists of the 7-bit I2C device
address and the data direction bit (R/_W).
The value of the R/_W bit in the header determines the
data direction for the rest of the data transfer sequence. If
R/_W = 0 (WRITE) the direction remains master-to-slave,
while if R/_W = 1 (READ) the direction changes to slave-
to-master after the header byte.
4. Command Set and Data Transfer
Sequences
A command is represented by an 8-bit command code.
The data direction may not change after the command
byte, since the R/_W bit of the preceding I2C header has
already determined the direction to be master-to-slave. In
order to execute commands in Read mode using I2C, the
following principle is used. On successful (acknowledged)
receipt of a command byte, the sensor stores the
command nibble internally. The Read mode of this
command is then invoked by initiating an I2C data transfer
sequence with R/_W = 1.
If a correctly addressed sensor recognizes a valid
command and access to this command is granted, it
responds by pulling down the SDA line during the
subsequent SCL pulse for the acknowledge signal (ACK).
Otherwise it leaves the SDA line unasserted (NACK).
The two most important commands are described in this
data sheet, and the data transfer sequences are specified.
Contact Sensirion for advanced sensor options.
4.1 Measurement triggering
Each individual measurement is triggered by a separate
read operation.
Note that two transfer sequences are needed to perform a
measurement. First write command byte hF1 (trigger
measurement) to the sensor, and then execute a read
operation to trigger the measurement and retrieve the flow
or differential pressure information.
On receipt of a header with R/_W=1, the sensor generates
the Hold Master condition on the bus until the first
measurement is completed. After the Hold Master
condition is released, the master can read the result as
two consecutive bytes. A CRC byte follows if the master
continues clocking the SCL line after the second result
byte. The sensor checks whether the master sends an
acknowledge after each byte and aborts the transmission
if it does not.
I2C Measurement
8-bit command code: hF1
Command: Trigger differential pressure measurement
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
S10000000 11110001
I2CAdr
W
Command
123456789
S 1 0 0 0 0 0 0 1 Hold Master
I2CAdr
R
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
MSByte MeasData
LSByte MeasData
Check Byte
P
Hatched areas indicate that the sensor controls the SDA line.
Note that the first measurement result after reset is not
valid.
4.2 Soft reset
This command forces a sensor reset without switching the
power off and on again. On receipt of this command, the
sensor reinitializes the control/status register contents
from the EEPROM and starts operating according to these
settings.
I2C Soft Reset
8-bit command code: hFE
Command: Soft reset
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
S10000000 11111110
I2CAdr
W
Command
system reboot
4.3 CRC-8 Redundant Data Transmission
Cyclic redundancy checking (CRC) is a popular technique
used for error detection in data transmission. The
transmitter appends an n-bit checksum to the actual data
sequence. The checksum holds redundant information
about the data sequence and allows the receiver to detect
transmission errors. The computed checksum can be
regarded as the remainder of a polynomial division, where
the dividend is the binary polynomial defined by the data
sequence and the divisor is a “generator polynomial”.
The sensor implements the CRC-8 standard based on the
generator polynomial
x8 + x5 + x4 +1.
Note that CRC protection is only used for date transmitted
from the slave to the master.
For details regarding cyclic redundancy checking, please
refer to the relevant literature.
www.sensirion.com
Version 1.9 July 2015
5/10


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