DIGITAL OUTPUT PRESS U R E
Enhanced Digital Output Sensors
SENSORS
Features
• 5” H
2
O to 100psi Pressure Ranges
• All Combined Errors Over Temperature Less Than 0.1%, Typical
• Wide -20 to 85°C Compensated Temperature Range
• Electrically Compatible to All Sensors GA142 Series
• Enhanced Dual Serial Interface Mode
Applications
• Medical Instrumentation
• Environmental Controls
• HVAC
• Meteorology
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.
Physical Dimensions
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)
0.10 Typical
(2.54)
Pin 1 2 3 4 5 6
1
0.21
(5.3)
A
1.08
(27.4)
0.63
(16.0)
B
0.414
(10.5)
Pin Descriptions
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.
3
Clock/SO
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
DS-0012 Rev A
0 1
a
16035 Vineyard Blvd. Morgan Hill, CA 95037
p
408 225 4314
f
408 225 2079
e
www.allsensors.com
General Description
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
-20° C to +85° C
-25 to +90° C
-40 to 125° C
0 to 95% RH
(non condensing)
Standard Pressure Ranges
Part Number
5 INCH-D-DO
10 INCH-D-DO
1 PSI-D-DO
5 PSI-D-DO
15 PSI-D-DO
15 PSI-A-DO
30 PSI-D-DO
30 PSI-A-DO
100 PSI-D-DO
100 PSI-A-DO
Operating Pressure
-5 to 5
-10 to 10
-1 to 1
-5 to 5
-15 to 15
0 to 15
-30 to 30
0 to 30
-100 to 100
0 to 100
Units
inH2O
inH2O
PSI
PSI
PSI
PSIA
PSI
PSIA
PSI
PSIA
FSO
(2)
Digital Span
(4)
Proof Pressure
200 inH2O
200 inH2O
200 inH2O
10 PSI
60 PSI
60 PSI
90 PSI
90 PSI
200 PSI
200 PSI
Burst Pressure
300 inH2O
300 inH2O
300 inH2O
30 PSI
120 PSI
120 PSI
150 PSI
150 PSI
250 PSI
250 PSI
5
1
0
1
5
1
5
1
5
3
0
3
0
100
100
1
1
1
1
1
2
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
0.25
--
--
--
Maximum
0.5
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 and 1 PSI-D-DO
Parameter
(1)
(5)
Minimum
--
--
--
--
Nominal
0.25
--
--
--
Maximum
0.5
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)
0 2
Digital Output Pressure Sensors
Performance Characteristics for 5 PSI-D-DO through 100 PSI-x-DO
Parameter
(1)
Overall Accuracy
(5)
Minimum
--
--
Nominal
0.10
--
Maximum
0.25
0.25
Units
%FSO
%FSO
Long Term Drift (one year)
Specification Notes
NOTE
1:
U
NLESS OTHERWISE SPECIFIED
,
ALL PARAMETERS ARE MEASURED AT
5.0
VOLT SUPPLY
,
POSITIVE PRESSURE APPLIED TO
P
ORT
B.
NOTE
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
.
NOTE
3: S
HIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE
.
NOTE
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
.
NOTE
5: O
VERALL ACCURACY INCLUDES THE COMBINED EFFECTS OF OFFSET AND SPAN SHIFTS OVER TEMPERATURE
,
LINEARITY
,
HYSTERESIS
,
AND OFFSET AND SPAN
CALIBRATION
.
interface circuit for proper voltage level compatibility.)
READY [Output]
t1
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
t10
t2
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
24
12
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
70
14
476
Max
--
--
--
--
--
Units
usec
usec
usec
usec
usec
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
(1)
Clock/SO
Data/SI
Convert/BR
Ready/Mode
Host
System
Sensor
Clock/SO
Data/SI
Convert/BR
Ready/Mode
This mode supports multiple sensors by
addressable commands. The Convert/
BR pin then serves to select one of two
available baud rates.
Sensor
Clock/SO
Data/SI
(n)
Convert/BR
Ready/Mode
All Sensors
DS-0012 Rev A
a
16035 Vineyard Blvd. Morgan Hill, CA 95037
p
408 225 4314
f
408 225 2079
e
www.allsensors.com
Synchronous Timing Diagram
(Note: Asynchronous mode timing is per RS-232. To use RS-232 requires the Maxim MA232
all sensors
Command Summary Table:
Command
Description
RA<cr>
RC<cr>
RH<cr>
RL<cr>
RM<cr>
RR<cr>
RS<cr>
RT<cr>
U[S/N String][Command]<cr>
WC<cr>
Notations:
<> indicates a single ascii character
[] indicates an ascii string
Read Accuracy String
Read Captured Pressure
Read High Resolution Pressure
Read Low Resolution Pressure
Read Model
Read Pressure Range
Read Serial Number
Read Temperature
Unique Command
Capture Pressure
Response
RA=[Accuracy String]<cr>
RC=[hhhh]<sp>[eeee]<cr>
RH=[hhhh]<sp>[eeee]<cr>
RL[llll]<sp>[eeee]<cr>
RM=[Model String]<cr>
RR=[pressure Range String]<cr>
RS=[S/N String]<cr>
RT=[Temperature Range String]<cr>
For Matching S/N
{null}
U[S/N String],sp>[Response String]
For Non-matching S/N {null}
{} text within the braces describes the response (this is essentially a comment)
“” text within quotes represents a literal ascii text string
Definitions:
Term
<cr>
<sp>
[Accuracy String]
Name
Carriage Return
Space
Accuracy String
Description
ascii Carrage Return. This is a command/response delimiter
ascii Space Character
Part accuracy string. Given in % full scale output.
Example: 0.250 %FSO
Notes:
1.) There is a space between the numeric accuracy “0.250”
and units “%FSO.”
2.) FSO stands for Full Scale Output (full scale output is
determined by the Pressure Range String.)
This is a four character ascii string representing a
hexidecimal value.
Example: 3F7C
Represents an output count of 16,252
Note: the output is forced to “8000” upon an error.
except error bit 8, see error bit codes.
This is a four character ascii string representing a
hexidecimal value.
Example: 1D58
Represents an output count of 7,512
Note: the output is forced to “8000” upon an error.
except error bit 8, see error bit codes.
Part Model as given in the data sheet (also order number.)
The general model syntax is
[Full Scale Pressure]<sp>[Pressure Units]-[Pressure Model]-DO
Example: 100 PSI-D-DO
Where:
Full Scale Pressure=100
Pressure Units=PSI (inH2O, mbar or mmHg available)
DO represents Digital Output
Notes:
1.) Exception to this syntax is the Barometer.
2.) Custom models may be different.
[hhhh]
High Resolution Output
[llll]
Low Resolution Output
[Model String]
Model String
16-Mar-03
0 4
Digital Output Pressure Sensors
Definitions:
Term
[Pressure Range String]
Name
Pressure Range String
Description
This is the compensated pressure range of the part.
Syntax: [low limit]<sp>”to”<sp>[high limit]<sp>[units}[mode]
Esample: 20 to 32 mmHgA
Where:
Low limit = 20
High limit = 32
Units = mmHg
Mode = A (absolute pressure) (D differential and G gage
pressure also available.)
Example: “RL=1E43<sp>0000<cr>
YMDD-NN-BSPP (12 character String)
Where:
Y : Year (0~9)
M : Month (A~M, excluding I)
DD: Day of Month
NN: Lot (lot sequence for a given day)
B : Lot Batch# (A~Z)
S : Test Oven Slot# (1~5)
P : Position on Slot (1~15)
Example: 3D23-03-A103
[Response String]
[S/N String]
A Fully Formed Response String
Serial Number String
Month Codes
January : A
February : B
March
:C
April
:D
May
:E
June
:F
July
:G
August : H
September : J
October : K
November : L
December : M
April 23, 2003
3rd lot of the day
Batch A, Slot 1, Position 03
This allows traceability to original test data
[Temperature Range String]
Temperature Range String
[eeee]
Error Codes
Example: 0100
Represents erro bit 8 set and the Pressure Output Limited
Notes:
Bit 0 : This should not appear if the part has been calibrated
Bits 1 thru 7 : indicate computational error when compensated
Bit 8: indicates that the pressure applied to the part exceeds the
range of the part and is limit to either the high or low limit
{null}
Null Response
No response from the part. In the event of a serial number
mismatch the part will not respond (to avoid buss contention.)
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.
® MICROWIRE/PLUS
IS A REGISTERED TRADEMARK OF
N
ATIONAL
S
EMICONDUCTOR
.
All Sensors
DS-0012 Rev A
a
16035 Vineyard Blvd. Morgan Hill, CA 95037
p
408 225 4314
The error codes are bits packed within a double byte.
The four character string is an ascii hex expression.
The error code bits are:
Bit 0 : Part not factory compensated
Bit 1 : Tdex Overflow
Bit 2 : Tdex Over-range
Bit 3 : Pdex Overflow
Bit 4 : Pdex Over-range
Bit 5 : PWL Overflow
Bit 6 : Scale Overflow
Bit 7 : High Resolution Overflow
Bit 8 : Pressure Output Limited to Specific Value
Bits 9 through 15 : Reserved
f
408 225 2079
This is the compensated temperature range of the part.
Syntax: [low limit]<sp>[high limit]<sp>”C”
Example: -20 to 85 C
-40 to 125 C and custom ranges also available.
e
www.allsensors.com
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