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Honeywell IPT Скачать руководство пользователя страница 4

4

Sensor

-- Temperature --

Op-Amp

3.3V Output

LDO Regulator

256 X 8 EEPROM

SPI Serial

C

o

n

n

e

c

to

r

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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Содержание IPT

Страница 1: ...Honeywell Integrated Pressure Transducer IPT User s Manual ...

Страница 2: ...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...

Страница 3: ...hms 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 w...

Страница 4: ... 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 pres...

Страница 5: ...mperature 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...

Страница 6: ...6 2 3 Outline Dimensions inches ...

Страница 7: ...ions 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 ...

Страница 8: ...C requires writing data to a sequence of four registers the Communication register the Mode register the Communication register and the Configuration register 3 1 1 1 1 Communication Register Sending 0x10 to the Communication register tells the ADC the following write will be to the 16 bit Configuration register 3 1 1 1 2 Configuration Register Sending 0x1020 to the Configuration register sets the...

Страница 9: ... bit Filter register 3 1 1 2 2 Filter Register Sending 0x03 to the Filter register sets the ADC s update rate fADC to 20 Hz 3 1 1 2 3 Communication Register Sending 0x10 to the Communication register tells the ADC the following write will be to the 8 bit Mode register 3 1 1 2 4 Mode Register Sending 0x80 to the Mode register places the ADC into a single conversion mode From the AD7790 manufacturer...

Страница 10: ...e conversion mode and set the update rate to 470 Hz 6 Repeat 3 1 2 1 Temperature Channel After initializing the Mode register per section 3 1 1 1 a new 16 bit temperature value will be available in 100 ms As temperature is generally a more slowly changing input than pressure and has a modest impact on the pressure output this conversion rate should be adequate for most applications The temperature...

Страница 11: ...ling as described in sections 3 1 1 and 3 1 2 above Both pressure and temperature channel ADCs may also be configured to operate in Continuous Conversion and Continuous Reads modes Performance should be substantially the same in these alternate modes However they have not been thoroughly tested ...

Страница 12: ... d4 t3 e4 t4 fa4 t5 F5 a5 b5 t c5 t2 d5 t3 e5 t4 fa5 t5 F6 a6 b6 t c6 t2 d6 t3 e6 t4 fa6 t5 Output Y pressure value in PSI Inputs p 24 bit pressure channel ADC value normalized 0 1 Normalized pressure channel ADC value pressure channel ADC value 16 777 215 t 16 bit temperature channel ADC value normalized 0 1 Normalized temperature channel ADC value temperature channel ADC value 65 535 3 2 1 1 1 H...

Страница 13: ... 16 bit temperature channel ADC value normalized 0 1 Normalized temperature channel ADC value temperature channel ADC value 65 535 3 2 1 2 1 Horner s Method Algorithm 2 Horner s method is a suggested microcontroller friendly alternative for evaluating the above equations Y A p F1 p F2 p F3 p F4 p F5 F6 5 multiplies 6 additions F1 a1 t b1 t c1 t d1 t e1 t fa1 5 multiplies 5 additions F2 a2 t b2 t c...

Страница 14: ...ithm is a simple 3rd order polynomial as described below 3 2 2 1 Algorithm Y g1 g2 t g3 t2 g4 t3 Output Y pressure sensor temperature in C Inputs t 16 bit temperature channel ADC value normalized 0 1 Normalized temperature channel ADC value temperature channel ADC value 65 535 Coefficients g1 g2 g3 and g4 for the identified algorithm are stored in the IPT EEPROM 3 2 2 1 1 Horner s Method Horner s ...

Страница 15: ...e Temperature Limits IPT operating storage temperature limits Min Max Op Stor Temp are stored as 8 bit signed integers in locations 98 through 9B Examples Min Operating 40 D8 Max Operating 85 55 Min Storage 55 C9 Max Storage 125 7D 3 3 2 4 Minimum Pressure Output The minimum pressure output value Pmin is the minimum value observed from the pressure channel ADC over the IPT operating temperature pr...

Страница 16: ... Algorithm Type Date Four unsigned bytes are used to identify the correction Algorithm IPT transducer Type and the manufacturing Date Code Algorithm Type Date Code at locations A8 through AB The most significant byte is used to identify both the correction Algorithm and IPT type with high nibble for Algorithm and low nibble for Type shown here in binary Algorithm is 1 0000b 2 0001b Type is defined...

Страница 17: ...orrected Pressure To aid in development and debug of the Pressure Correction Algorithms found in section 3 2 1 a transducer specific 24 bit Seed Pressure Count spc a 16 bit Seed Temperature Count stc and the corresponding 32 bit IEEE 754 Corrected Seed Pressure reading csp have been stored in the IPT EEPROM The 24 bit spc value is stored in locations C8 through CB with leading zero s The 16 bit st...

Страница 18: ...8675 63 5C 48 83 30 74 d6 438418 22 60 C8 D6 12 47 e1 51952 816 64 C7 4A F0 D1 e2 10252 898 68 C6 20 33 98 e3 31521 736 6C C6 F6 43 79 e4 148898 56 70 C8 11 68 A4 e5 108588 63 74 C7 D4 16 50 e6 306424 84 78 48 95 9F 1B fa1 15124 948 7C 46 6C 53 CB fa2 4531 3633 80 45 8D 9A E8 fa3 13495 57 84 C6 52 DE 48 fa4 92770 586 88 47 B5 31 4B fa5 7349 3057 8C C5 E5 AA 72 fa6 80684 555 90 C7 9D 96 47 FS 50 94...

Страница 19: ...though there is no official specification for the SPI interface a defacto standard it is intended for short distance on board communications between a microcontroller or microprocessor Master and a peripheral Slave To help ensure signal integrity minimize signal path distance between any Master and the IPT 4 1 Installation Examples The three examples below are for illustrative purposes only and do...

Страница 20: ...pressure sensor 4 1 3 Static Radial and Face O ring Seals Considerations 1 Select o ring size material for the application s temperature and pressure extremes 2 Minimize mechanical stress between the circuit board and the on board pressure sensor 5 Marking An adhesive label on the O D of the IPT sensor contains the unit s model code serial number and date code MMDDYY Example IPT0020A33R T003 S N 2...

Страница 21: ...k Byte 2 83 10000011 131 0 0 Example with single bit error Hex Binary Decimal SUM1 SUM2 Data C0 11000000 192 192 192 Data E7 11100111 231 167 103 Data C5 11000101 197 108 211 Data 04 00000100 4 112 67 Check Byte 1 ED 11101101 237 93 160 Check Byte 2 83 10000011 131 224 128 Example with two single bit errors Hex Binary Decimal SUM1 SUM2 Data C2 11000010 194 194 194 Data E5 11100101 229 167 105 Data...

Страница 22: ...oneywell 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 ...

Страница 23: ...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 Honeywell 12001 Highway 55 ADS 14152 Plymouth MN 55441 Rev July 2016 www pressuresensing com 2016 Honeywell International Inc ...

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