30PSI-D-DO - All Sensors

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Enhanced Digital Output Sensors

Digital 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

1Vcc +5V power supply input

2Data/SI Data output for synchronous

mode. Serial in for asynchro-

nous mode.

3Clock/SO Clock output for synchronous

mode. Serial out for asynchro-

nous mode.

4Ready/Mode Ready output for synchronous

mode. Selects asynchronous

mode when held low during

reset.

5Convert/BR Convert input for synchronous

mode. Selects one of two baud

rates for asynchronous mode

(low=9,600, high=19,200).

6Ground Ground for power and signals

Pin Descriptions

0.80

(20.3)

0.85

(21.6)

1.10

(27.9)

0.10 Typical

(2.54)

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)

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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

0.03

0.25

Units

%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

0.05

0.25

Units

%FSO

Performance Characteristics for 5 INCH-D-DO

Nominal

Minimum

Parameter (1)

Resolution

Conversion Speed

Supply Current

Maximum

Units

Bit

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

10 PSI

60 PSI

90 PSI

200 PSI

Burst Pressure

300 inH2O

30 PSI

120 PSI

150 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)

FSO (2)

100

Units

inH2O

PSI

PSIA

PSI

PSIA

PSI

PSIA

2-21

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 communica-

tions 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/

Ready/

Mode

Clock/

Data/

Convert/

Ready/

Mode

Clock/

Data/

Nominal

0.10

Minimum

Parameter (1)

Overall Accuracy (5)

Long Term Drift (one year)

Maximum

0.25

Units

%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.

t2 t10 t2

t9t4 t8

t6 t7

Bit

MSB

Bit

14 Bit

13 Bit

12 Bit

11 Bit

10 Bit

9Bit

8Bit

7Bit

6Bit

5Bit

4Bit

3Bit

2Bit

1Bit

LSB

READY [Output]

CONVERT [Input]

CLOCK [Output]

DATA [Output]

Ref Parameter Min Typ Max Units

t1 Conversion Time -- 8 16 msec

t2 Ready to Convert 0-- -- usec

t3 Convert to Clock 24 32 39 usec

t4 Clock Period -- 16 -- usec

t5 Clock High Time -- 8-- usec

Ref Parameter Min Typ Max Units

t6 Data Setup Time -- 3-- usec

t7 Data Hold Time -- 3-- usec

t8 Interbyte Delay -- 57 -- usec

t9 Clock to Ready -- 14 -- usec

t10 Data Transmission -- 335 -- usec

Synchronous Timing Diagram (Note: Asynchronous mode timing is per RS-232. To use RS-232 requires the Maxim MA232

interface circuit for proper voltage level compatibility.)

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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 Temperature RT=[Temperature 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 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 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 Example: “RL=1E43<sp>0000<cr>

[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