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All Sensors DS-0012 Rev A
Enhanced Digital Output Sensors
0101
0101
01
DIGITA L OUTPUT PRESSURE SENSORS
• Medical Instrumentation
• Environmental Controls
• HVAC
• Meteorology
Applications
• 5” H2O 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
Features
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.
General Description
Physical Dimensions
Pin Label Description
1 Vcc +5V power supply input
2 Data/SI Data output for synchronous
mode. Serial in for asynchro-
nous mode.
3 Clock/SO Clock output for synchronous
mode. Serial out for asynchro-
nous mode.
4 Ready/Mode Ready output for synchronous
mode. Selects asynchronous
mode when held low during
reset.
5 Convert/BR Convert input for synchronous
mode. Selects one of two
baud rates for asynchronous
mode (low=9,600,
high=19,200).
6 Ground Ground for power and signals
Pin Descriptions
0.80
(20.3)
0.85
(21.6)
1.10
(27.9)
0.10 Typical
(2.54)
A
B
1
Pin 1 23456
0.63
(16.0)
0.21
(5.3)
0.414
(10.5)
0.48
(12.2) 0.55
(14.0)
0.174 to 0.190
(4.4 to 4.8)
1.08
(27.4)
0.25
(6.4) Pin Size
0.010 x 0.020
(0.25 x 0.50)
NOTES:
1) Dimensions in inches (millimeters)
Digital Output Pressure Sensors
0202
0202
02
Absolute Maximum Ratings
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)
Environmental Specifications
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
Nominal
0.25
--
--
--
Minimum
--
--
--
--
Parameter (1)
Overall Accuracy (5)
Long Term Drift (one year)
Offset Position Sensitivity (1g)
Offset Warm-up Shift (3)
Maximum
0.5
0.5
0.03
0.25
Units
%FSO
%FSO
%FSO
%FSO
Performance Characteristics for 10 INCH-D-DO and 1 PSI-D-DO
Nominal
0.25
--
--
--
Minimum
--
--
--
--
Parameter (1)
Overall Accuracy (5)
Long Term Drift (one year)
Offset Position Sensitivity (1g)
Offset Warm-up Shift (3)
Maximum
0.5
0.5
0.05
0.25
Units
%FSO
%FSO
%FSO
%FSO
Performance Characteristics for 5 INCH-D-DO
Nominal
--
8
8
Minimum
12
--
--
Parameter (1)
Resolution
Conversion Speed
Supply Current
Maximum
--
16
12
Units
Bit
mS
mA
General Performance Characteristics (All Models)
Standard Pressure Ranges
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
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
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
Digital Span (4)
1
1
1
1
1
2
2
2
2
2
FSO (2)
5
10
1
5
15
15
30
30
100
100
Units
inH2O
inH2O
PSI
PSI
PSI
PSIA
PSI
PSIA
PSI
PSIA
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All Sensors DS-0012 Rev A
Synchronous Communications
Typical synchronous communications
configuration (compatible with All
Sensors GA142 Series Digital Output
Sensors).
Typical Configurations
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.
This mode supports multiple sensors by
addressable commands. The Convert/
BR pin then serves to select one of two
available baud rates.
Host
System Sensor
Convert
/BR
Ready
/Mode
Clock
/SO
Data
/SI
Host
System
Sensor
(1)
Sensor
(n)
Convert/
BR
Ready/
Mode
Clock/
SO
Data/
SI
Convert/
BR
Ready/
Mode
Clock/
SO
Data/
SI
Nominal
0.10
--
Minimum
--
--
Parameter (1)
Overall Accuracy (5)
Long Term Drift (one year)
Maximum
0.25
0.25
Units
%FSO
%FSO
Performance Characteristics for 5 PSI-D-DO through 100 PSI-x-DO
Specification Notes
NOTE 1: UNLESS OTHERWISE SPECIFIED, ALL PARAMETERS ARE MEASURED AT 5.0 VOLT SUPPLY, POSITIVE PRESSURE APPLIED TO PORT B.
NOTE 2: THE DIGITAL OUTPUT IS A 16 BIT SIGNED BINARY OUTPUT IN A TWO’S COMPLIMENT FORMAT. THE APPLIED PRESSURE IS COMPUTED USING THE PRESSURE
CONVERSION TABLE (BELOW). THE MODE COLUMN IDENTIFIES THE RESOLUTION OPERATING MODE OF THE DEVICE (A = STANDARD RESOLUTION, B =
HIGH RESOLUTION). FSO AND UNITS ARE SHOWN FOR EACH MODEL.
NOTE 3: SHIFT IS WITHIN THE FIRST HOUR OF EXCITATION APPLIED TO THE DEVICE.
NOTE 4: DIGITAL SPAN IS DEPENDENT ON THE RESOLUTION OPERATING MODE. REFER TO THE DIGITAL SPAN TABLE (BELOW) TO IDENTIFY THE DIGITAL SPAN OF THE
SPECIFIC MODEL. IN 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 DIGITAL SPAN TO INDICATE THE CONDITION.
NOTE 5: OVERALL ACCURACY INCLUDES THE COMBINED EFFECTS OF OFFSET AND SPAN SHIFTS OVER TEMPERATURE, LINEARITY, HYSTERESIS, AND OFFSET AND SPAN
CALIBRATION.
Synchronous Timing Diagram (Note: Asynchronous mode timing is per RS-232. T o use RS-232 requires the Maxim MA232
interface circuit for proper voltage level compatibility .)
t1
t3
t2 t10 t2
t9t4 t8
t6 t7
Bit
15
MSB
Bit
14 Bit
13 Bit
12 Bit
11 Bit
10 Bit
9Bit
8Bit
7Bit
6Bit
5Bit
4Bit
3Bit
2Bit
1Bit
0
LSB
t5
READY [Output]
CONVERT [Input]
CLOCK [Output]
DATA [Output]
Ref Parameter Min Typ Max Units
t1 Conversion Time -- 816 msec
t2 Ready to Convert 0-- -- usec
t3 Convert to Clock 24 32 39 usec
t4 Clock Period -- 24 -- usec
t5 Clock Hi gh Tim e -- 12 -- usec
Ref Parameter Min Typ Max Units
t6 Data Setup Time -- 3-- usec
t7 Data Hold Time -- 3-- usec
t8 Int erbyte D elay -- 70 -- usec
t9 Clock to Ready -- 14 -- usec
t10 Data Transmission -- 476 -- usec
Digital Output Pressure Sensors
0404
0404
04
16-Mar-03
Command Summary Table:
Command Description Response
RA<cr> Read Accuracy String RA=[Accuracy String]<cr>
RC<cr> Read Captured Pressure RC=[hhhh]<sp>[eeee]<cr>
RH<cr> Read High Resolution Pressure RH=[hhhh]<sp>[eeee]<cr>
RL<cr> Read Low Resolution Pressure RL[llll]<sp>[eeee]<cr>
RM<cr> Read Model RM=[Model String]<cr>
RR<cr> Read Pressure Range RR=[pressure Range String]<cr>
RS<cr> Read Serial Number RS=[S/N String]<cr>
RT<cr> Read T emperature RT=[T emperature Range String]<cr>
U[S/N String][Command]<cr> Unique Command For Matching S/N U[S/N String],sp>[Response String]
For Non-matching S/N {null}
WC<cr> Capture Pressure {null}
Notations:
<> indicates a single ascii character
[] indicates an ascii string
{} text within the braces describes the response (this is essentially a comment)
“” text within quotes represents a literal ascii text string
Definitions:
Term Name Description
<cr> Carriage Return ascii Carrage Return. This is a command/response delimiter
<sp> Space ascii Space Character
[Accuracy String] Accuracy String 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.)
[hhhh] High Resolution Output 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.
[llll] Low Resolution Output 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.
[Model String] Model String 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.
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All Sensors DS-0012 Rev A
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 an y 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 NATIONAL SEMICONDUCTOR.
Definitions:
Term Name Description
[Pressure Range String] Pressure Range String 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.)
[Response String] A Fully Formed Response String E xa m pl e : “RL = 1E 4 3< s p> 0 00 0<c r >
[S/N String] Serial Number String 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
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 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.
[eeee] Error Codes 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
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.)
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
