• All Combined Errors Over Temperature Less Than 0.1%, Typical
• Wide -40 to 125°C Compensated Temperature Range
• Electrically Compatible to All Sensors GA142 Series
• Enhanced Dual Serial Interface Mode
Applications
• Medical Instrumentation
• Environmental Controls
• HVAC
• Meteorology
General Description
The Digital Output pressure sensors are based upon a proprietary surface mapping technology to produce a fully digital
output that virtually eliminates all repeatable errors over temperature and pressure. This series provides a 12 bit digital
serial output (14 bit in High Resolution Mode) with superior offset, span and linearity characteristics. The output is SPI and
MICROWIRE/PLUS
®
compatible as well as fully compatible with the All Sensors GA142 Series sensors.
In addition to synchronous communications, the Digital Output pressure sensors incorporates a bi-directional, TTL level,
asynchronous serial interfaces mode (hardware selectable 9,600 or 19,200 baud). This mode includes a command set that
allows the host to interrogate the sensor for model information, pressure range, serial number, pressure units and
conversion factor. The command set also allows the host to select a high resolution output mode, make minor adjustments
to offset and has an addressable feature that alows multiple sensors to be tied to the same interface buss.
This series is intended for use with non-corrosive, non-ionic working fluids such as air, dry gases and the like. All signals
are 5V TTL/CMOS compatible.
Pin Descriptions
0.10 Typical
(2.54)
0.25
(6.4)
Pin Size
0.010 x 0.020
(0.25 x 0.50)
0.174 to 0.190
(4.4 to 4.8)
Pin Label
1 Vcc
2
Data/SI
Description
+5V power supply input
Data output for synchronous
mode. Serial in for asynchro-
nous mode.
Clock output for synchronous
mode. Serial out for asynchro-
nous mode.
Pin 1 2 3 4 5 6
1
0.21
(5.3)
A
0.414
(10.5)
3
Clock/SO
1.08
(27.4)
0.63
(16.0)
B
4
Ready/Mode Ready output for synchronous
mode. Selects asynchronous
mode when held low during
reset.
Convert/BR
Convert input for synchronous
mode. Selects one of two
baud rates for asynchronous
mode (low=9,600,
high=19,200).
Ground for power and signals
0.48
(12.2)
0.55
(14.0)
0.80
(20.3)
0.85
(21.6)
1.10
(27.9)
5
NOTES:
1) Dimensions in inches (millimeters)
6
Ground
all sensors
01
a
6296 San Ignacio, Suite E & F, San Jose, CA 95119
Physical Dimensions
p
408 225 4314
f
408 225 2079
e
www.allsensors.com
all sensors
Absolute Maximum Ratings
Supply Voltage (Vcc)
Voltage on Any Pin with Respect to Gnd
Common-mode pressure
Lead Temperature (soldering 2-4 sec.)
7Vdc
-0.6 to Vcc+0.6V
50 psig
250°C
Environmental Specifications
Operating Voltage
Compensated Temperature
Operating Temperature
Storage Temperature
Humidity Limits
+4.75Vdc to +5.25Vdc
-40° C to +125° C
-40 to +125° C
-40 to 125° C
0 to 95% RH
(non condensing)
Proof Pressure
200 inH2O
200 inH2O
200 inH2O
200 inH2O
5 PSI
10 PSI
60 PSI
60 PSI
60 PSI
90 PSI
90 PSI
200 PSI
200 PSI
Burst Pressure
300 inH2O
300 inH2O
500 inH2O
800 inH2O
15 PSI
30 PSI
120 PSI
120 PSI
120 PSI
150 PSI
150 PSI
250 PSI
250 PSI
Standard Pressure Ranges
Part Number
5 INCH-D-DO-MIL
10 INCH-D-DO-MIL
20 INCH-D-DO-MIL
30 INCH-D-DO-MIL
1 PSI-D-DO-MIL
5 PSI-D-DO-MIL
15 PSI-D-DO-MIL
15 PSI-A-DO-MIL
BARO-DO-MIL
30 PSI-G-DO-MIL
30 PSI-A-DO-MIL
100 PSI-G-DO-MIL
100 PSI-A-DO-MIL
Operating Pressure
-5 to 5
-10 to 10
-20 to 20
-30 to 30
-1 to 1
-5 to 5
-15 to 15
0 to 15
600 to 1100
0 to 30
0 to 30
0 to 100
0 to 100
Units
inH2O
inH2O
inH2O
inH2O
PSI
PSI
PSI
PSIA
mBar
PSI
PSIA
PSI
PSIA
FSO
(2)
Digital Span
(4)
5
10
20
30
1
5
15
15
1100
30
30
100
100
1
1
1
1
1
1
1
2
3
2
2
2
2
General Performance Characteristics (All Models)
Parameter
Resolution
Conversion Speed
Supply Current
(1)
Minimum
12
--
--
Nominal
--
8
8
Maximum
--
16
12
Units
Bit
mS
mA
Performance Characteristics for 5 INCH-D-DO
Parameter
(1)
(5)
Minimum
--
--
--
--
Nominal
0.5
--
--
--
Maximum
1.0
0.5
0.05
0.25
Units
%FSO
%FSO
%FSO
%FSO
Overall Accuracy
Long Term Drift (one year)
Offset Position Sensitivity (1g)
Offset Warm-up Shift
(3)
Performance Characteristics for 10 INCH-D-DO, 20 INCH-D-DO and 30 INCH-D-DO
Parameter
(1)
(5)
Minimum
--
--
--
--
Nominal
0.5
--
--
--
Maximum
1.0
0.5
0.03
0.25
Units
%FSO
%FSO
%FSO
%FSO
Overall Accuracy
Long Term Drift (one year)
Offset Position Sensitivity (1g)
Offset Warm-up Shift
(3)
02
digital output military grade pressure sensors
Performance Characteristics for 10 INCH-D-DO, 20 INCH-D-DO and 30 INCH-D-DO
Parameter
(1)
Overall Accuracy
(5)
Minimum
--
--
--
--
Nominal
0.5
--
--
--
Maximum
1.0
0.5
0.03
0.25
Units
%FSO
%FSO
%FSO
%FSO
Long Term Drift (one year)
Offset Position Sensitivity (1g)
Offset Warm-up Shift
(3)
Performance Characteristics for BARO-DO
Parameter
(1)
Overall Accuracy
(5)
Minimum
--
--
Nominal
1.0
--
Maximum
2.5
2.0
Units
mBar
mBar
Long Term Drift (one year)
Parameter
(1)
Overall Accuracy
(5)
Minimum
--
--
Nominal
0.25
--
Maximum
0.5
0.25
Units
%FSO
%FSO
Long Term Drift (one year)
NOTE
NOTE
NOTE
NOTE
NOTE
Digital Span Table
Span
1
2
3
Mode S (Standard) Mode H (High Res)
-10,399 to 10,399
-32,767 to 32,766
-399 to 10,399
-999 to 32,766
5,054 to 10,399
17,501 to 32,766
Pressure Conversion Table
Mode
S
H
Pressure Output Equation
P_Out
Digital_Out
•
P_Out
Digital_Out
•
FSO
•
Units
32 767
,
Typical Configurations
Synchronous Communications
Typical synchronous communications
configuration (compatible with All
Sensors GA142 Series Digital Output
Sensors).
Asynchronous Communications
Typical asynchronous communications
configuration. The Mode pin is
interrogated at power up and if tied
low, will cause the sensor to enter
asynchronous communications mode.
Sensor
Host
System
Clock/SO
(1)
Data/SI
Convert /BR
R e a d y /Mode
Host
System
Sensor
Clock/
S O
Data/SI
Convert
/BR
Ready
/ M o d e
This mode supports multiple sensors by
addressable commands. The Convert/
BR pin then serves to select one of two
available baud rates.
Sensor
(n)
Clock/SO
Data/SI
Convert /BR
R e a d y /Mode
all sensors
a
6296 San Ignacio, Suite E & F, San Jose, CA 95119
FSO
•
Units
10 000
,
p
408 225 4314
1: U
NLESS OTHERWISE SPECIFIED
,
ALL PARAMETERS ARE MEASURED AT
5.0
VOLT SUPPLY
,
POSITIVE PRESSURE APPLIED TO
P
ORT
B.
2: T
HE DIGITAL OUTPUT IS A
16
BIT SIGNED BINARY OUTPUT IN A TWO
’
S COMPLIMENT FORMAT
. T
HE APPLIED PRESSURE IS COMPUTED USING THE
P
RESSURE
C
ONVERSION
T
ABLE
(
BELOW
). T
HE
M
ODE COLUMN IDENTIFIES THE RESOLUTION OPERATING MODE OF THE DEVICE
(A = S
TANDARD RESOLUTION
, B =
H
IGH RESOLUTION
). FSO
AND
U
NITS ARE SHOWN FOR EACH MODEL
.
3: S
HIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE
.
4: D
IGITAL
S
PAN IS DEPENDENT ON THE RESOLUTION OPERATING MODE
. R
EFER TO THE
D
IGITAL
S
PAN
T
ABLE
(
BELOW
)
TO IDENTIFY THE DIGITAL SPAN OF THE
SPECIFIC MODEL
. I
N THE EVENT OF AN OVER
-
PRESSURE OR UNDER
-
PRESSURE CONDITION
,
THE DIGITAL OUTPUT WILL ONE COUNT HIGHER OR ONE COUNT
LOWER
(
RESPECTIVELY
)
TO THE LISTED
D
IGITAL
S
PAN TO INDICATE THE CONDITION
.
5: O
VERALL ACCURACY INCLUDES THE COMBINED EFFECTS OF OFFSET AND SPAN SHIFTS OVER TEMPERATURE
,
LINEARITY
,
HYSTERESIS
,
AND OFFSET AND SPAN
CALIBRATION
.
f
408 225 2079
Specification Notes
e
www.allsensors.com
Performance Characteristics for 1 PSI-D-DO through 100 PSI-A-DO (except BARO-DO)
all sensors
Asynchronous Command Summary
Command
RD
RM
RO
RP
RR
RS
WD<Mode>
WO<Offset>
U<S/N><Cmd>
Description
Read Mode Setting
(1,2)
Response
RD=<Mode>
RM=<Model String>
RO=<hhhh>
RP=<hhhh>
RR=<Range String>
RS=<Serial Number String>
WD=<Mode>
WO=<hhhh>
U<S/N><Cmd>
Read Model Information
Read User Offset Setting
Read Pressure
Read Device Pressure Range
Read Serial Number
Write Mode Setting (“S” = Standard, “H” = High Resolution)
Write User Offset Setting
Select Unique Part for following command (for multidrop
configurations).
Asynchronous Command Notes
NOTE
1: A
LL
COMMANDS AND RESPONSES ARE IN
IN COMMAND AND RESPONSE TABLE
).
SEQUENCE
:
NOTE
ASCII
CHARACTER FORMAT
E
XAMPLE
: T
HE
R
EAD
P
RESSURE
AND ARE TERMINATED BY A
COMMAND
(
REPRESENTED
BY
:
C
ARRIAGE
R
ETURN
(C
ARRIAGE
R
ETURNS ARE NOT SHOWN
RP<
CR
>)
IS GIVEN BY THE FOLLOWING THREE BYTE
REPRESENTS THE RESPONSE OF AN
2: <
HHHH
>
WITH THE
IS A FOUR BYTE
0
X
52 0
X
50 0
X
0D
ASCII
STRING REPRESENTING A
16-
BIT SIGNED
PRESSURE OUTPUT OF
0
X
2B7D (11,133
DECIMAL
)
VALUE
.
VALUE
.
E
XAMPLE
: P=2B7D
RP
COMMAND
Synchronous Timing Diagram
READY [Output]
t1
(Note: Asynchronous mode timing is per RS-232)
t10
t2
t2
CONVERT [Input]
t3
t4
t5
CLOCK [Output]
t6
t7
DATA [Output]
Bit
15
MSB
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
LSB
t8
t9
Ref
t1
t2
t3
t4
t5
Parameter
Conversion Time
Ready to Convert
Convert to Clock
Clock Period
Clock High Time
Min
--
0
24
--
--
Typ
8
--
32
16
8
Max
16
--
39
--
--
Units
msec
usec
usec
usec
usec
Ref
t6
t7
t8
t9
t10
Parameter
Data Setup Time
Data Hold Time
Interbyte Delay
Clock to Ready
Data Transmission
Min
--
--
--
--
--
Typ
3
3
57
14
335
Max
--
--
--
--
--
Units
usec
usec
usec
usec
usec
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 herein, neither does it convey any license under its patent rights nor the rights of others.
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