RCE Series
Digital pressure sensors
FEATURES
· 0...±10 mbar to 0...5 bar,
0...±4 inch H
2
O to 0...100 psi,
absolute, gage or differential pressure
· Barometric pressure ranges
· SPI bus and analog output
· Precision ASIC conditioning
· Calibrated and temperature
compensated
· Total accuracy ±1.0 %FSS
· Sensortechnics PRO services
MEDIA COMPATIBILITY
To be used with non-corrosive, non-ionic working
fluids such as clean dry air, dry gases and the like.
SPECIFICATIONS
Maximum ratings
Supply voltage V
S
Output current
Sink
Source
Maximum pressure on any port
6
4.75 V to 5.25 V
DC
max. 6.50 V
DC
1 mA
1 mA
10 bar
ELECTRICAL CONNECTION
Bottom view
Lead specifications
Average preheating temperature gradient 2.5 K/s
Soak time
ca. 3 min
Time above 217°C
50 s
Time above 230°C
40 s
Time above 250°C
15 s
Peak temperature
260°C
Cooling temperature gradient
-3.5 K/s
Temperature ranges
Compensated
Operating
Storage
Caution!
0 to +85 °C
-10 to +85 °C
-20 to +105 °C
6
5
4
3
2
1
CLK
Vout
SS
GND
+Vs
MISO
Pin 1
marked by dot
Note: MOSI is internally connected to high level.
No external port is available.
The sensor is not reverse polarity protected. Incorrect applications of excitation voltage or ground to the wrong
pin can cause electrical failure. Application of supply voltage above the maximum can cause electrical failure.
E / 11716 / A
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RCE Series
Digital pressure sensors
PRESSURE RANGES SPECIFICATIONS
Part number
RCE0611AR
RCEM025DU
RCEM050DU
RCEM100DU
RCEM250DU
RCEM500DU
RCEB001(A,D)U
RCEB002(A,D)U
RCEB005(A,D)U
RCEM010DB
RCEM025DB
RCEM050DB
RCEM100DB
RCEM250DB
RCEM500DB
RCEB001DB
RCE1216AR
RCEH010DU
RCEP001DU
RCEP005DU
RCEP015(A,D)U
RCEP030(A,D)U
RCEP100(A,D)U
RCEH004DB
RCEH010DB
RCEP001DB
RCEP005DB
RCEP015DB
Pressure range
600...1100 mbar
0...25 mbar
0...50 mbar
0...100 mbar
0...250 mbar
0...500 mbar
0...1 bar
0...2 bar
0...5 bar
0...±10 mbar
0...±25 mbar
0...±50 mbar
0...±100 mbar
0...±250 mbar
0...±500 mbar
0...±1 bar
12...16 psi
0...10 inch H
2
O
0...1 psi
0...5 psi
0...15 psi
0...30 psi
0...100 psi
0...±4 inch H
2
O
0...±10 inch H
2
O
0...±1 psi
0...±5 psi
0...±15 psi
Burst pressure
1
2 bar
0.2 bar
0.35 bar
0.35 bar
1 bar
1 bar
2 bar
5 bar
10 bar
0.2 bar
0.2 bar
0.35 bar
0.35 bar
1 bar
1 bar
2 bar
3 0 p si
3 p si
5 p si
1 5 p si
3 0 p si
7 0 p si
1 5 0 p si
3 p si
3 p si
5 p si
1 5 p si
3 0 p si
Specification notes:
1.
If maximum burst pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may
fracture.
2.
Full Scale Span (FSS) is the algebraic difference between the output signal for the highest and lowest specified pressure.
3.
Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature effects.
Linearity is the measured deviation based on a straight line. Hysteresis is the maximum output difference at any point within
the operating pressure range for increasing and decreasing pressure. Calibration errors include the deviation of offset and
full scale from nominal values.
4.
Max. delay time between pressure change at the pressure die and signal change at the output.
5.
The response time depends on the adjusted internal A/D resolution of the sensor. For 12 bit it is typ. 0.5 ms. Other A/D resolutions
and reponse times are available on request. Please contact Sensortechnics for further information.
6.
Maximum pressure on any port is the maximum operating plus common-mode pressure for differential pressure devices
which can be applied without damaging the sensor. Common Mode Pressure is the pressure applied to both sides of the
diaphragm simultaneously.
E / 11716 / A
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RCE Series
Digital pressure sensors
PERFORMANCE CHARACTERISTICS
(V
s
= 5.0 V, T
A
= 25 °C, analog output signal is
ratiometric
to V
S
, digital output signal is
not ratiometric
to V
S
)
All devices
Characteristics
Total accuracy (0 ... 85°C)
3
Response delay
4,5
A/D resolution
5
D/A resolution
Min.
Typ.
0.5
12
Max.
±1.0
Units
%FSS
ms
11
bi t
Current consumption (no load)
5
mA
All RCE...(U,R)
Characteristics
Offset at lowest specified pressure
Full scale span (FSS)
2
Full scale output
Offset at lowest specified pressure
Full scale span (FSS)
2
Full scale output
Min.
1700
31700
0.26
4.84
Typ.
2000
30000
32000
0.31
4.58
4.88
Max.
2300
Units
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC S
counts
32300
0.35
V
4.93
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC S
All RCE...B
Characteristics
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Min.
16700
31700
1700
2.55
4.84
0.26
Typ.
17000
30000
32000
2000
2.59
4.58
4.88
0.31
Max.
17300
32300
2300
2.64
4.93
0.35
Units
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC S
counts
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC S
V
E / 11716 / A
3/7
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RCE Series
Digital pressure sensors
SPI - SERIAL PERIPHERAL INTERFACE
Introduction
The RCE is capable to generate a digital output signal.
The device runs a cyclic program, which will store a corrected
sensor value with 12-bit resolution about every 250 µs within
the output registers of the internal ASIC. This cyclic program
runs independent from the bus communication. In order to
use the RCE pressure sensor for digital signal readout, it
should be connected to a SPI Master device.
SPI specifies four signals: The clock (CLK) is generated by
the master and input to all slaves. MOSI carries data from
master to slave. MISO carries data from slave back to
master. A slave select line (SS) allows individual selection
of a slave device.
In general the RCE series supports all combinations of
clock phase (CPHA) and polarity (CPOL). By default it is
programmed to CPHA = 0 and CPOL = 0, which means
that data transmission starts with the rising first clock edge
(see Fig 1).
Slave select
The falling edge of the SS line indicates the beginning of
the transfer. Additionally the SS line must not be negated
and reasserted between the three bytes to be transmitted.
Data operation
The MOSI is internally connected to high level. So there is
no data transmission from master to slave. Because of
internal configuration the slave will answer the first byte
with an FFxh. The second and third byte contain the 15 bit
pressure information (see Fig. 2).
SPI Modes
A pair of parameters called clock polarity (CPOL) and clock
phase (CPHA) determine the edges of the clock signal on
which the data are driven and sampled. Each of the two
parameters has two possible states, which allows for four
possible combinations, all of which are incompatible with
one another.
For further information please refer to
Sensortechnics SPI bus application note
SCK cycle
SCK
(CPOL=0)
MOSI
MISO
SS
Sampling
Fig. 1:
1
2
3
4
5
6
7
8
MSB
LSB
MSB
LSB
Example of a standard 1 byte SPI data transfer for CPHA=0 and CPOL=0
Data Byte 1
MOSI
MISO
1
X
1
X
1
X
1
X
1
X
1
X
1
X
1
X
1
1
Data Byte 2
1
1
1
1
1
1
1
1
Data Byte 3
1
1
1
1
1
1
X P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 P0
Relevant data
Fig. 2:
3 byte data stream between RCE sensor and master containing the pressure value as a 15 bit information
4/7
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RCE Series
Digital pressure sensors
SPI - SERIAL PERIPHERAL INTERFACE (cont.)
Interface parameters
Parameter
Input high level
Input low level
Output low level
Pull-up resistor
Load capacitance @ MISO
Input capacitance @ each pin
Signal clock frequency
MISO hold time after SCK sample slope
MOSI setup time before SCK sample slope
/SS setup time before SCK sample slope
C
MISO
C
SPI_IN
f
SCK
t
SPI_HD_MISO
t
SPI_SU_MOSI
t
SPI_SU_SS
100*
200
2/f
CLK
10
ns
500
400
10
640
Symbol
Min.
90
0
Typ.
Max.
100
10
10
Unit
% of V s
Ω
pF
kHz
ns
* recommended
Note: Sensortechnics recommends communication speeds of at least 100 kHz (max. 640 kHz).
Please contact your nearest Sensortechnics sales office for further information.
t
SPI_SU_SS
t
SCK
(CPOL=0)
SPI_SU_MOSI
t
SPI_HD_MISO
MOSI
MISO
SS
Fig. 3:
Timing characteristics
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