Honeywell IPT User Manual
Honeywell Integrated Pressure Transducer
IPT User’s Manual
ADS-14152 Rev. 7/16
Customer Service Email: quotes@honeywell.com
www.pressuresensing.com
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including
photocopying and recording, for any purpose, without the express written permission of Honeywell, Inc.
Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell 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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IPT User’s Manual Contents
1 Introduction ..................................................................................................................................................... 4
1.1 Overview .................................................................................................................................................. 4
2 Specifications ................................................................................................................................................. 4
2.1 Block Diagram ................................................................................................................................ ......... 4
2.2 Specifications/Performance ..................................................................................................................... 5
2.3 Outline/Dimensions (inches) .................................................................................................................... 6
2.4 Electrical Connections ................................................................................................ ............................. 7
2.4.1 Connector ......................................................................................................................................... 7
3 Operation ........................................................................................................................................................ 8
3.1 Commands and Format ........................................................................................................................... 8
3.1.1 Initialization ....................................................................................................................................... 8
3.1.2 Normal Operation (Polling) .............................................................................................................. 10
3.1.3 Other Modes ................................................................................................................................ ... 11
3.2 Correction Algorithms ............................................................................................................................ 12
3.2.1 Pressure ......................................................................................................................................... 12
3.2.1.1 Algorithm #1 ................................................................................................................................. 12
3.2.1.1.1 Horner’s Method, Algorithm #1 .................................................................................................. 12
3.2.1.2 Algorithm #2 ................................................................................................................................. 13
3.2.1.2.1 Horner’s Method, Algorithm #2 .................................................................................................. 13
3.2.2 Pressure Sensor Temperature ........................................................................................................ 14
3.2.2.1 Algorithm ...................................................................................................................................... 14
3.2.2.1.1 Horner’s Method........................................................................................................................ 14
3.3 EEPROM Storage .................................................................................................................................. 15
3.3.1 EEPROM Format ............................................................................................................................ 15
3.3.2 Contents ......................................................................................................................................... 15
4 Installation Recommendations ...................................................................................................................... 19
4.1 Installation Examples ......................................................................................................................... 19
4.1.1 Flexible Tubing and Double-wire Hose Clamps .......................................................................... 19
4.1.2 Static Radial O-ring Seals .......................................................................................................... 20
4.1.3 Static Radial and Face O-ring Seals ........................................................................................... 20
5 Marking ........................................................................................................................................................ 20
6 Fletcher Checksum ....................................................................................................................................... 21
6.1 Calculation ................................................................................................................................ ............. 21
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Sensor
-- Temperature -Op-Amp
3.3V Output
LDO Regulator
256 X 8 EEPROM
SPI Serial
Connector
3.3V Analog and
Digital Supply
4-12V
-- Pressure -Op-Amp
24-bit ADC, SPI
18+ ENOB @ 250 sps
+ P.S.
DIN
SCLK
CS_ADC_P
CS_EE
GND
16-bit ADC, SPI
~16 ENOB @ 20 sps
CS_ADC_T
DOUT/RDY
1 Introduction
1.1 Overview
The Honeywell IPT provides high accuracy pressure data in an industry standard SPI digital format. The core
of the IPT is a proven Honeywell silicon piezo-resistive pressure sensor with both pressure and temperature
sensitive elements. The IPT is both small and lightweight and can be easily integrated into a wide variety of
applications that require high performance in a small package.
Applying coefficients stored in the on-board EEPROM to normalized IPT pressure and temperature output
yields accurate pressure readings over a -40 to 85°C compensated temperature range.
2 Specifications
2.1 Block Diagram
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2.2 Specifications/Performance
Total Error Band
(1)
±0.04%FS absolute
±0.10%FS gauge, differential
±0.20%FS 1 psi gauge
Supply Voltage
4 to 12 VDC
Current Consumption
6 mA typical, 7.5 mA max
Operating Temperature Range
-40 to 85°C (-40 to 185°F)
Storage Temperature Range
-55 to 125°C (-67 to 257°F)
Sample Rate
See section 3.1.2
Long Term Stability
0.025%FS max per year typical
Pressure Ranges/Type
20, 50 psia
1, 2, 5, 10, 20 psig
1, 2, 5, 10, 20 psid
Pressure Units
PSI
(2)
Media Compatibility
Non-condensing, non-corrosive,
non-combustible gases
Weight
(3)
~ 8.0 grams (absolute)
~ 9.7 grams (gauge, differential)
Size
See section 2.3
(3)
Interface
3.3V SPI (mode 1,1)
(4)
SCLK ≤ 5 MHz
Output
24-bit pressure value
16-bit temperature value
256 x 8 EEPROM configuration
Overpressure
3X FS
Burst Pressure
3X FS
Humidity Sensitivity of Pressure Ports
DO-160E, Section 6.0, category A
(5)
Electromagnetic Immunity/Emissions
(6)
Mechanical Shock
DO-160E Section 7.0, Category A,
Figure 7.2, Operational Standard
Thermal Variation
Storage Temperature Cycling per
JESD22-104, Section 5.0: -55°C to
+125°C,
Vibration
DO-160E Section 8, Category H,
Aircraft Type 2, Aircraft Zones 1 & 2.
ESD
Class 3A, Table III, MIL-STD-883G,
Method 3015.7, section 3.4
RoHS Compliant (2011/65/EU)
Yes
(1)
Total Error is the sum of worst case linearity, repeatability, hysteresis, thermal effects, and calibration errors over the operating
temperature range. Accuracy is only achieved after applying the correction coefficients and algorithm as shown in section 3.2. (FS =
Full Scale) For total error calculations of differential units, “Full Scale” is the pressure difference between the minimum and maximum
pressures. For example, full scale for a 1 psid PPT is 2 psi (-1 to +1 psi).
(2)
After applying the correction coefficients stored in EEPROM, the resultant pressure reading is expressed in PSI (pounds per square
inch).
(3)
Not including any mounting hardware. Dimensions in section 2.3 do not include Humiseal 1A33 conformal coating which is typically
applied to the PWB assembly at a thickness of 1-3 mils.
(4)
Operation with a digital interface > 3.3V can damage the IPT and cause shifts in the ADC output.
(5)
IPT electronics require protection from humidity.
(6)
IPT requires shielding from EMI.
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2.3 Outline/Dimensions (inches)
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2.4 Electrical Connections
2.4.1 Connector
2mm, 2x4 Low Profile Bottom & Top-Entry Connector, Samtec P/N CLT-104-02-L-D-A-K-TR
Connector centered on circuit board and aligned with mounting holes.
Compatible Samtec mating connectors: TMM, MMT, TW, TMMH, MTMM
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