KP125N4115 INFINEON | Alldatasheet
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Sense & Control Data Sheet Rev 1.01 Absolute Pressure Sensor KP125N4115
81726 München, Germany
© 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.
Data Sheet 3 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
Data Sheet 4 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Absolute Pressure Sensor Revision History: 2007-11-23, Rev 1.01 Previous Version: Rev 1.0 Page Subjects (major changes since last revision) Page 9 Page 11 Clamping added in operating range and transfer function. 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
Product Name Product Type Ordering Code Package Data Sheet 5 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
1 Overview
1.1 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
1.2 Product Description
The KP125N4115 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 KP125N4115 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 calibrated transfer function converts a pressure range from 15 kPa to 115 kPa into an analog output voltage between 0.2 V and 4.7 V.
Data Sheet 6 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Pin Configuration
2 Pin Configuration
Figure 1 Pin Configuration (top view, figure not to scale) Table 1 Pin Definitions and Functions Pin No. Name Function
1 TEST Test pin 1)
1) Digital pins are used only during calibration and test. It is recommended to leave these PINs floating.
2 CLOCK / VPROG External Clock for Communication / Programming Voltage 1)
3 DATA IN Serial data input pin 1)
4 DATA OUT Serial data output pin 1)
5 VDD Supply Voltage
6 GND 0 Volt circuit ground potential 2)
2) It is recommended to connect both GND PINs.
7 VOUT Analog pressure signal output
8 GND Alternative ground pin 2)
V DD DATA IN TEST CLOCK / VPROG DATA OUT
Data Sheet 7 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Functional Block Diagram
3 Functional Block Diagram
A D 1 bit D A 12 bit 10 bit 1 kHz Linearization OBD VDD Clock Generator Temperature Compensation Internal Reference Voltage EEPROM (90+22 bit) Digital Control Test and Programming Interface VDD CLOCK / VPROG DATA IN GND DATA OUT VOUT 30kHz 10 bit Clamping
Data Sheet 8 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Functional Description
4 Functional Description
4.1 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 self- conducting. For example, if the GND connection is interrupted, the output is drawn strongly to V DD. 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 9 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Functional Description
4.2 Transfer Function
The KP125N4115 device is fully calibrated on delivery. The sensor has a linear transfer function between the applied pressure and the output signal: 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: Figure 3 Transfer Function Note: The application circuitry determines the current driven by the device and thus has an impact on the diagnostic ranges. Table 2 Transfer Function (End Points) Pressure Output Voltage @ VDD = VDD;TYP Symbol Values Unit Symbol Values Unit PIN,MIN 15 kPa VOUT,MIN 0.2 V PIN,MAX 115 VOUT,MAX 4.7 VOUT =V DD x (a x P + b) 10 30 50 70 90 110 130 Pressure (kPa) VOUT (V) Input Pressure Range Maximum Input Pressure Range 150 4.85 0.1
Data Sheet 10 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
Electrical Characteristics
5 Electrical Characteristics
5.1 Absolute Maximum Ratings
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. Table 3 Absolute Maximum Ratings Parameter Symbol Values Unit Note / Test Condition Min. Typ. Max. Supply voltage VDD – 0.3 – 6.5 V – – 16.5 1h @ 70°C – 6.5 1) 1) Reverse polarity; IDD < 300mA – – for max. 5 minutes Output voltage VOUT – 0.3 – VDD+ 0.3 V Maximum ambient temperature TA – 40 125 °C Storage temperature TS – 60 150 °C Maximum input pressure range PMAX 40 5.8 – 600 kPa psi for max. 5 minutes 5.8 – 150 21.75 kPa psi Voltage at CLOCK / VPROG Pin VCLK – – 20 V Voltage at data pins (DATA IN, DATA OUT) VDATA – – 5.0 V ESD robustness 2) 2) HBM: 1.5k Ω, 100pF; according to EIA/JESD22-A114-B (covers MIL STD 883D) VESD, HBM – – ± 2 kV Analog pins: VDD, Vout, GND – – ± 2 kV Digital pins: CLOCK / VPROG, DATA OUT, DATA IN
Data Sheet 11 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
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 Operating Range Parameter Symbol Values Unit Note / Test Condition Min. Typ. Max. Supply voltage VDD 4.5 5 5.5 V VOUT is ratiometric to VDD Output current1) 1) Negative values: Current into device (pull-up resistor used). Positive values: Current out of the device (pull-down resistor used). IOUT – 1 – 1 mA Lifetime tLT 15 – – years Maximum ambient temperature TA – 40 125 °C Input pressure range PIN 40 5.8 115 16.7 kPa psi
Data Sheet 12 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
5.3 Sensor Characteristics
Table 5 Sensor Characteristics Parameter Symbol Values Unit Note / Test Condition Min. Typ. Max. Output Voltage Range VOUT_R 0.10 4.85 V More information in chapter “Electrical Details” on Page 13 Sensitivity S – 45 – mV/ kPa Supply current IDD – 8 10 mA 1) 1) A peak supply current of up to 22 mA is possible during power up. Overall Accuracy Error Err – – ± 1.2 kPa 2) 2) More details in “Overall Accuracy” on Page 16 Ratiometric Error ERAT –25 – 25 mV 3) 3) More details in “Supply Voltage Influence (Ratiometric Error)” on Page 15 Output referred noise VNOISE – – 2.5 mVRMS @ f > 1kHz 4)) 4) 200 measurements in sequence, bandwidth limited to 40kHz – – 1.8 @ f < 1kHz Response time 5) 5) More details in “Timings” on Page 14 tR – 1.8 – ms 10% to 90% of the final output value Stabilization time 5) tS – – 10 ms For full accuracy Power up time 5) tUP – – 5 ms 90% of the final output value Broken wire: diagnosis response time 6) 6) In the event of a broken wire (broken V DD line or broken GND line), the output changes to certain voltage levels within the broken wire response time. tOBD – – 1 ms OBD Transistor On Resistance RDSON – – 160 Ω VOUT to VDD or VOUT to GND, @ 25°C Junction temperature7) 7) T junction = Tambient + ∆Tc,j (in steady-state condition, typical operation conditions) Tj – 30.2 134.8 °C Thermal resistance Rthj-amb 245 K/W Lower Clamping level1) VCL,LOW 0.097 0.1 0.13 V Refer to clamping level error Upper Clamping level1) VCL,HI 4.82 4.85 4.88 V Clamping level error1) ∆VCL –30 – 30 mV Upper and lower clamping level. Clamping level resolution1) ∆VC,R – 10 15 mV @ 25°C 8) 8) Clamping level resolution is included in accuracy.
Data Sheet 13 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
5.4 Electrical Details
5.4.1 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) Figure 4 Maximum Output Voltage Limit at Maximum Rated Pressure with Pull-Down Load 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. 4.50 4.60 4.70 4.80 4.90 Source Current (mA) Pull-Down Resistance (k Ω) 20 10 550 0.1 4.85 VOUT 5.00 0.10 0.20 0.30 0.40 0.50 Sink Current (mA) Pull-Up Resistance (k Ω) 20 10 550 0.1 VOUT
Data Sheet 14 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115
5.4.2 Timings
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. 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. Figure 7 Response Time and Stabilization Time 0 5 10 15 20 25 30 Time (msec) 100 120 VOUT 90% of Final Value VDD Pressure tUP Pressure (kPa) Voltage (V) Time (msec) Voltage (V) 100 120 Pressure (kPa) VOUT90% of Final Value Pressure tR 10% of Final Value tS within Required Accuracy 13 4 5
Data Sheet 15 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Accuracy
6 Accuracy
The accuracy of the KP125N4115 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 3. The error equals the deviation between the measured output voltage value and the specified output voltage value.
6.1 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: The output voltage VOUT is ratiometric to VDD , within the range provided in Table 2. VDD must be within the operating range specified in Table 4. Figure 8 Ratiometric Error Table 6 Ratiometric Error Supply Voltage (V) Max. Ratiometric Error (% of VDD,TYP) VDD,MIN ± 0.5 VDD,TYP 0 VDD,MAX ± 0.5 ERAT (%) = VOUT(@VDD) - VOUT(@5V) x VDD 5V x 100% -0.5 VDD,MIN VDD 0.5 VDD,MAXVDD,TYP ERAT (%)
Data Sheet 16 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Accuracy
6.2 Overall Accuracy
Overall accuracycovers 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: Figure 9 Overall Error Over Temperature Table 7 Accuracy Temperature Point (°C) Error (kPa) Error Multiplier – 40 ± 2.4 2 0 ± 1.2 1 85 ± 1.2 1 125 ± 2.4 2 0.0 0.5 1.0 1.5 2.0 2.5 -40 85 125 Error Band (± kPa) T (°C)
Data Sheet 17 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Application Circuit
7 Application Circuit
It is recommended to protect the KP125N4115 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 Circui try 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. Note: The value of load resistor R1 or R2 determines the current driven by the device. Table 8 Component Values Component Symbol Values Unit Note Min. Typ. Max. Pull-Up Resistor R1 5 59 100 kΩ Only 1 resistor allowed Pull-Down Resistor R2 5 59 100 kΩ Low Pass Resistor R3 3.9 22 100 kΩ Supply Blocking Capacitor C1 10 100 100 nF Output Blocking Capacitor C2 0 100 100 nF Low Pass Capacitor C3 10 100 100 nF
Data Sheet 18 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Package
8 Package
As well as using “green” materials, the P G-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 KP125N4115 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 19 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Package Outlines
9 Package Outlines
9.1 Package Dimensions
Data Sheet 20 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Package Outlines
9.2 Cap dimensions
Data Sheet 21 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Package Outlines
9.3 Footprint
0.8 8.2 1.2 1.2 1.27
Data Sheet 22 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 EMC Requirements
10 EMC Requirements
10.1 EM Immunity by Direct Power Injection
The KP125N4115 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 KP125N4115 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 Figure 14 Hardware Set Up for Electrical Fast Transients Sensor
Data Sheet 23 Rev 1.01, 2007-11-23 Absolute Pressure Sensor KP125N4115 Identification Code
11 Identification Code
The identification code is provided in a machine-readable format. The date and sales code are provided in human- readable format. Figure 15 Sensor Identification Code The marking for the KP125N4115 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 YYW W KP125 N 411 5 Data Matrix Code (Serial Number) 8 x 18 Dots Dot Size: 0.15 mm x 0.15 mm Date Code Sales Code Sales Code
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