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N ov e m be r 2 00 7
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Absolute Pressure Sensor
K P 1 25
D a ta S h e e t
R e v 2. 1 4
S e ns e & C on t r ol
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Edition 2007-11-23 Published by Infineon Technologies AG 81726 Munchen, Germany (c) 2007 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
www..com Pressure Sensor KP125
1 1.1 1.2 2 3 4 4.1 4.2 5 5.1 5.2 5.3 5.4 5.4.1 5.4.2 6 6.1 6.2 7 8 9 9.1 9.2 9.3 10 10.1 10.2 11
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Transfer Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Voltage versus Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10 11 12 13 13 14
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Supply Voltage Influence (Ratiometric Error) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Overall Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cap dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 19 20 21
EMC Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 EM Immunity by Direct Power Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 EM Immunity by Electrical Fast Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Data Sheet
3
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
Absolute Pressure Sensor Revision History: 2007-11-23, Rev 2.14 Previous Version: Rev2.1 Page Page 5 Page 5 Page 10 Page 10 Page 11 Page 12 Page 15 Page 17 Page 23 Page 19 Page 19 Page 22 Page 23 Subjects (major changes since last revision) Feature "green" package added. Paragraph about pressure range rephrased. ESD robustness corrected. Symbol for input pressure range (max and operating) added/changed. Junction temperature added. Definition ratiometric error rephrased. Formula added. Misspelling corrected. Drawing updated. "Green" compliancy added in package chapter. Chapter EMC added. Chapter identification code added.
Previous Version: Rev2.11 Page 17 Page 18 Page 19 Changes in recommended application circuit. Reorganization of chapters package outlines and cap.
Previous Version: Rev2.12 Page 6 Changes according to application circuit for GND connection and digital PINs.
Previous Version: Rev2.13 Page 12 Correction of sensor characteristics output referred noise.
We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: sensors@infineon.com
Data Sheet
4
Rev 2.14, 2007-11-23
www..com
Absolute Pressure Sensor
KP125
1
1.1
* * * * * *
Overview
Features
Ratiometric analog output Calibrated transfer function High accuracy over a large temperature range Maximum error 1.2 kPa "Green" 8-pin SMD housing On Board Diagnostics (OBD) for broken wire detection
PG-DSOF-8-12 with cap
1.2
Product Description
The KP125 is a miniaturized Absolute Pressure Sensor IC based on the capacitive principle. It is surface micromachined with a monolithic integrated signal conditioning circuit implemented in BiCMOS standard technology. Because the KP125 is a high-precision IC for cost-critical solutions, the chip is packaged in a "green" low-cost SMD housing. The sensor is developed for measurement of barometric air pressure (BAP). High accuracy and high sensitivity enable the deployment of this device in automotive applications as well as in consumer applications. The KP125 has an input pressure range from 40 kPa to 115 kPa. Applied pressure is transferred to an analog output voltage between 0.5 V and 4.5 V.
Product Name KP125 Data Sheet
Product Type
Ordering Code
Package PG-DSOF-8-12 Rev 2.14, 2007-11-23
Absolute Pressure Sensor SP000271097 5
www..com Pressure Sensor KP125
Pin Configuration
2
Pin Configuration
TEST CLOCK / VPROG DATA IN DATA OUT
1 2 3 4
8 7 6 5
GND VOUT GND VDD
Figure 1 Table 1 Pin No. 1 2 3 4 5 6 7 8
Pin Configuration (top view, figure not to scale) Pin Definitions and Functions Name TEST CLOCK / VPROG DATA IN DATA OUT VDD GND VOUT GND Function Test pin 1) External Clock for Communication / Programming Voltage 1) Serial data input pin Supply Voltage 0 Volt circuit ground potential 2) Analog pressure signal output Alternative ground pin
2) 1) 1)
Serial data output pin
1) Digital pins are used only during calibration and test. It is recommended to leave these PINs floating. 2) It is recommended to connect both GND PINs.
Data Sheet
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Functional Block Diagram
3
Functional Block Diagram
VDD
CLOCK / VPROG
DATA IN
DATA OUT
Internal Reference Voltage
EEPROM (90+22 bit)
Test and Programming Interface
Digital Control Temperature Compensation
VOUT A D
1 kHz
Linearization
12 bit 10 bit 10 bit
D
1 bit
A
30kHz
V DD Clock Generator OBD
GND
Figure 2
Block Diagram
Data Sheet
7
Rev 2.14, 2007-11-23
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Functional Description
4
4.1
Functional Description
Sensor
Pressure is detected in a capacitive way by an array of surface micromachined sensor cells. The sensor cell output is amplified, temperature compensated and linearized to obtain an output voltage that is proportional to the applied pressure. The transfer function for linearization is calculated in the digital part of the sensor using third order polynomial calculation. The transfer function is given by the following parameters: * * * * Minimum and maximum rated pressure Voltage at minimum rated pressure Voltage at maximum rated pressure Sensitivity
The output is analog and ratiometric with respect to the supply voltage. All parameters needed for the complete calibration algorithm -- such as offset, gain, temperature coefficients of offset and gain, and linearization parameters -- are determined after assembly. The parameters are stored in internal registers in the EEPROM of the chip. On Board Diagnostics When the chip is not powered properly, the JFET transistors of the On Board Diagnostics (OBD) stage are selfconducting. For example, if the GND connection is interrupted, the output is drawn strongly to VDD. The microcontroller can set a limit for valid output signals. In the case of an error, the output voltages will be too close to the VDD or GND potential.
Data Sheet
8
Rev 2.14, 2007-11-23
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Functional Description
4.2
Transfer Function
The KP125 device is fully calibrated on delivery. The sensor has a linear transfer function between the applied pressure and the output signal:
V OUT = VDD x (a x P + b)
The output is ratiometric. Gain a and Offset b are determined during calibration in order to create the required transfer function. Standard Transfer Function The following calibration is adjusted with the parameters a and b: Table 2 Symbol Transfer Function (End Points) Pressure Values 40 115 Unit kPa Symbol Output Voltage @ VDD = VDD;TYP Values 0.5 4.5 Unit V
PIN,MIN PIN,MAX
VOUT,MIN VOUT,MAX
V OUT (V)
5 4 3 2 1 0 10 30 50 70
Input Pressure Range Maximum Input Pressure Range
90
110
130
150
Pressure (kPa)
Figure 3 Transfer Function Note: The application circuitry determines the current driven by the device and thus has an impact on the diagnostic ranges.
Data Sheet
9
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Electrical Characteristics
5
5.1
Table 3 Parameter
Electrical Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings Symbol Min. Values Typ. - -
1)
Unit Max. 6.5 16.5 - V
Note / Test Condition
Supply voltage
VDD
- 0.3 - - 6.5
1h @ 70C for max. 5 minutes C C kPa psi kPa psi V V kV kV Analog pins: VDD, Vout, GND Digital pins: CLOCK / VPROG, DATA OUT, DATA IN for max. 5 minutes
- -
Output voltage Maximum ambient temperature Storage temperature Maximum input pressure range
VOUT TA TS PMAX
- 0.3 - 40 - 60 40 5.8 40 5.8
VDD+ 0.3 V
125 150
- - - - - -
600 87 150 21.75 20 5.0 2 2
Voltage at CLOCK / VPROG Pin VCLK Voltage at data pins (DATA IN, DATA OUT) ESD robustness 2)
- -
VDATA
VESD, HBM -
-
1) Reverse polarity; IDD < 300mA 2) HBM: 1.5k, 100pF; according to EIA/JESD22-A114-B (covers MIL STD 883D)
Attention: Stresses above the max. values listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit.
Data Sheet
10
Rev 2.14, 2007-11-23
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Electrical Characteristics
5.2
Operating Range
The following operating conditions must not be exceeded in order to ensure correct operation of the device. All parameters specified in the following sections refer to these operating conditions, unless otherwise noticed. Table 4 Parameter Supply voltage Output current1) Lifetime Maximum ambient temperature Input pressure range Operating Range Symbol Min. Values Typ. 5 - - Max. 5.5 1 - 125 115 16.7 V mA years C kPa psi 4.5 -1 15 - 40 40 5.8 Unit Note / Test Condition
VDD IOUT tLT TA PIN
VOUT is ratiometric to VDD
1) Negative values: Current into device (pull-up resistor used). Positive values: Current out of the device (pull-down resistor used).
Data Sheet
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Electrical Characteristics
5.3
Table 5 Parameter
Sensor Characteristics
Sensor Characteristics Symbol Min. Values Typ. Max. 4.85 53.3 8 - - - - 1.8 - - - - - 10 1.2 25 2.5 1.8 - 10 5 1 160 134.8 245 ms ms ms ms C K/W VOUT to VDD or VOUT to GND, @ 25C V mV/ kPa mA kPa mV mVRMS
1) 2) 3)
Unit
Note / Test Condition More information in chapter "Electrical Details" on Page 13
Output Voltage Range Sensitivity Supply current Overall Accuracy Error Ratiometric Error Output referred noise Response time
5)
VOUT_R S IDD Err ERAT VNOISE tR tS tUP tOBD RDSON Tj Rthj-amb
0.10 - - - -25 - - - - - - - - 30.2
@ f > 1kHz 4)) @ f < 1kHz 10% to 90% of the final output value For full accuracy 90% of the final output value
Stabilization time 5) Power up time
5)
Broken wire: diagnosis response time 6) OBD Transistor On Resistance Junction temperature7) Thermal resistance
1) 2) 3) 4) 5) 6)
A peak supply current of up to 22 mA is possible during power up. More details in "Overall Accuracy" on Page 16 More details in "Supply Voltage Influence (Ratiometric Error)" on Page 15 200 measurements in sequence, bandwidth limited to 40kHz More details in "Timings" on Page 14 In the event of a broken wire (broken VDD line or broken GND line), the output changes to certain voltage levels within the broken wire response time. 7) Tjunction = Tambient + Tc,j (in steady-state condition, typical operation conditions)
Data Sheet
12
Rev 2.14, 2007-11-23
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Electrical Characteristics
5.4 5.4.1
* *
Electrical Details Output Voltage versus Load
The output voltage limits depend on: the value of the external load resistor the connection mode (pull-up or pull-down)
5.00 VOUT 4.90
4.85
50
20
Pull-Down Resistance (k ) 10
5
4.80 4.70 4.60 4.50 0.0 0.1 0.2 0.4 0.6 Source Current (mA) 0.8 1.0
Figure 4
Maximum Output Voltage Limit at Maximum Rated Pressure with Pull-Down Load
50 VOUT 0.50 0.40 0.30 0.20 0.10 0 0.0 0.1 0.2
20
Pull-Up Resistance (k) 10
5
0.4 0.6 Sink Current (mA)
0.8
1.0
Figure 5
Minimum Output Voltage Limit at Minimum Rated Pressure with Pull-Up Load
Note: The values in the diagrams are valid for the entire specified temperature range.
Data Sheet
13
Rev 2.14, 2007-11-23
www Data Pressure. Sensor S KP125
heet
Electrical Characteristics
5.4.2
Timings
Power-up Time The power-on time tUP is defined as the maximum time between the supply voltage reaching its operating range and the output voltage reaching 90% of its final value.
120
Voltage (V)
4 3 2 1 0 0 5 10 15 20 tUP
90% of Final Value
Pressure
100 80
VOUT
60 40 20 0
25
30
Time (msec)
Figure 6 Power-up Time
Response Time and Stabilization Time The Response Time tR is defined as the time for the incremental output change to go from 10% to 90% of its final value after a specified pressure step. The Stabilization Time tS is defined as the time required for the output voltage to meet the specified accuracy after the pressure has been stabilized.
120
Voltage (V)
4 3 2 1 0 0 1 2 tR
within Required Accuracy 90% of Final Value
100 80 60
VOUT
10% of Final Value
40 20 0
3
4
5
Time (msec)
Figure 7 Response Time and Stabilization Time
Data Sheet
14
Pressure (kPa)
Rev 2.14, 2007-11-23
5
tS
Pressure
Pressure (kPa)
5
VDD
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Accuracy
6
Accuracy
The accuracy of the KP125 sensor is influenced by the supply voltage (ratiometric error) and by pressure, temperature and aging. The specified value represents the theoretical value, when the actual pressure is multiplied with the transfer function, see Figure 7. The error equals the deviation between the measured output voltage value and the specified output voltage value.
6.1
Definition
Supply Voltage Influence (Ratiometric Error)
Ideally, the sensor is ratiometric - the output (VOUT) scales by the same ratio that VDD increases or decreases. The ratiometric error is defined as the difference between the ratio that VDD changed and the ratio that VOUT changed, expressed as a percentage:
ERAT (%) =
VOUT(@VDD) - V OUT(@5V) x 5V
VDD 5V
x 100%
The output voltage VOUT is ratiometric to VDD , within the range provided in Table 4.
VDD must be within the operating range specified in Table 4.
Table 6 Ratiometric Error Max. Ratiometric Error (% of VDD,TYP) 0.5 0 0.5
Supply Voltage (V)
VDD,MIN VDD,TYP VDD,MAX
E RAT (%)
0.5
0
-0.5 VDD,MIN VDD,TYP VDD,MAX VDD
Figure 8
Ratiometric Error
Data Sheet
15
Rev 2.14, 2007-11-23
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Accuracy
6.2
Overall Accuracy
Overall accuracy covers the entire pressure and temperature range from all sources of error including the following: * * * Pressure: Output deviation from target transfer function over the specified pressure range. Temperature: Output deviation over the temperature range. Aging All drifting parameters during operating time.
Note: Ratiometric signal error is not included in the overall accuracy. For error measurements, the supply voltage must have the nominal value (VDD = VDD,TYP). The error band is determined by three continuous lines through four relevant break points: Table 7 - 40 0 85 125 Accuracy Error (kPa) 2.4 1.2 1.2 2.4 Error Multiplier 2 1 1 2
Temperature Point (C)
2.5 2.0 Error Band ( kPa) 1.5 1.0 0.5 0.0
-40
0 T (C)
85
125
Figure 9
Overall Error Over Temperature
Data Sheet
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Rev 2.14, 2007-11-23
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Application Circuit
7
Application Circuit
It is recommended to protect the KP125 pressure sensor IC against overload voltage and electro-magnetic interference (as shown in Figure 10). The output circuitry acts as a low-pass decoupling filter between the sensor IC output and the A/D input of the microcontroller.
Figure 10
Application Circuitry for Evaluation
Note: It is recommended to leave digital PINs CLOCK/VPROG, DATA IN and DATA OUT floating. If these PINs are grounded, it is recommended to connect both GND PINs. Table 8 Component Pull-Up Resistor Pull-Down Resistor Low Pass Resistor Supply Blocking Capacitor Output Blocking Capacitor Low Pass Capacitor Component Values Symbol Min. R1 R2 R3 C1 C2 C3 5 5 3.9 10 0 10 Values Typ. 59 59 22 100 100 100 Max. 100 100 100 100 100 100 k k k nF nF nF Only 1 resistor allowed Unit Note
Note: The value of load resistor R1 or R2 determines the current driven by the device.
Data Sheet
17
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
Package
8
Package
As well as using "green" materials, the PG-DSOF-8-12 package is optimized regarding mechanical stress influences. The package fulfills the solder conditions for lead-free board assembly. In the application it is recommended to ensure that the same pressure is applied to the whole package. The KP125 is supplied with a removable plastic cap (refer to Figure 12). The flat surface of this cap on top of the package allows handling with standard pick-and-place tools. After soldering the device to the printed circuit board (PCB), the cap on the PG-DSOF-8-12 may be removed. When removing the protective cap, care should be taken to avoid damage to the device. In some applications, such as for barometric measurements, it may be appropriate to leave the protective cap on the package after the soldering process. Damage to the gel is prevented. The four splits in the cap side allow a sufficient pressure coupling.
Data Sheet
18
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
Package Outlines
9
9.1
Package Outlines
Package Dimensions
Figure 11
Package
Data Sheet
19
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
Package Outlines
9.2
Cap dimensions
Figure 12
Cap Dimensions
Data Sheet
20
Rev 2.14, 2007-11-23
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Package Outlines
9.3
Footprint
1.2
1.27
8.2
Figure 13
Footprint
Data Sheet
21
0.8
1.2
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
EMC Requirements
10
10.1
* *
EMC Requirements
EM Immunity by Direct Power Injection
The KP125 test is compliant to EMC requirements for Direct Power Injection (DPI) described in ISO 11452-7 11-95 IEC 62132-3 01-00.
10.2
EM Immunity by Electrical Fast Transients
The KP125 test is compliant to EMC requirements for Electrical Fast Transients (EFT) according to the hardware set up shown in Figure 14, which is based on * * * ISO 7637-1 08-00 ISO/CD 7637-2 02-99 ISO 7637-3 11-95
Sensor
Figure 14
Hardware Set Up for Electrical Fast Transients
Data Sheet
22
Rev 2.14, 2007-11-23
www..com Pressure Sensor KP125
Identification Code
11
Identification Code
The identification code is provided in a machine-readable format. The date and sales code are provided in humanreadable format.
Data Matrix Code (Serial Number) 8 x 18 Dots Dot Size: 0.15 mm x 0.15 mm
Y Y WW
Figure 15
Sensor Identification Code
The marking for the KP125 is on the same side of the package as pin 8. Date code definition: WW: work week (1...53) YY: year (06...99) Data Matrix Code: 8 x 18 Dots, Dot Size: 0.15 mm x 0.15 mm
Data Sheet
23
KP
125
Sales Code
Date Code
Rev 2.14, 2007-11-23
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Published by Infineon Technologies AG

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