KP229E3518 Infineon Technologies, KP229E3518 Datasheet - Page 9

• Manufacturer Part Number: KP229E3518
• Description: IC ANLG ABSOLUTE PRES SNSR DSOF8
• Manufacturer: Infineon Technologies

Specifications of KP229E3518

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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The pressure is detected by an array of capacitive 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 computed in the digital part of the sensor using a third order polynomial
calculation. The transfer function is created from the following parameters:
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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 an
integrated E²PROM. The E²PROM content is protected with forward error correction (a one bit error is detected
and corrected, errors of more than one bit are detected and the output signal is switched to ground potential).
Clamping
The output voltage is limited internally to two clamping threshold levels. Based on this feature, the open bond
detection (OBD) is simplified and improved.
Open Bond Detection
The open bond detection, in conjunction with the clamping levels, eases the implementation of error and
malfunction detection strategies (e.g. for On-Board Diagnosis requirements). The microcontroller can sample the
output of the sensor and compare it with programmed overvoltage and undervoltage limits. When the sensor’s
output voltage exceeds those limits, a broken wire condition is identified.
When the chip is not powered properly, the JFET transistors of the broken wire detection stage are self-
conducting. For example, if the GND connection is interrupted, the output is drawn strongly to VDD. Similarly, if
the VDD connection is broken, the output is drawn to GND.
Data Sheet
Minimum and maximum rated pressure
Voltage level at minimum and maximum rated pressure
Clamping levels
Functional Description
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Analog Absolute Pressure Sensor
Revision 1.0, 2010-09-27
Functional Description
KP229E3518