KP212K1409
Analog Absolute Pressure Sensor
Features
•
•
•
•
•
•
•
High precision pressure sensing (± 1.0 kPa)
Ratiometric analog output
Large temperature range (-40 °C to 125 °C)
Broken wire detection
Clamping
“Green” 8 pin SMD housing
Automotive qualified
Applications
The KP212K1409 is defined for use in following target applications:
•
•
•
•
Two wheeler applications (manifold air pressure measurement)
Industrial control
Consumer application
Medical application
Description
The KP212K1409 is a miniaturized Analog Manifold Air Pressure Sensor IC based on a capacitive principle. It is
surface micromachined with a monolithic integrated signal conditioning circuit implemented in BiCMOS
technology.
The sensor converts a pressure into an analog output signal. The calibrated transfer function converts a pressure
of 15 kPa to 115 kPa into a voltage range of 0.5 V to 4.5 V.
The chip is packaged in a “green” SMD housing. The sensor has been primarily developed for measuring manifold
air pressure, but can also be used in other application fields. The high accuracy and the high sensitivity of the
device makes it a perfect fit for advanced automotive applications as well as in industrial and consumer
applications.
Type
KP212K1409
Package
PG-DSOF-8-16
Ordering Code
SP005435491
Marking
KP212K1409
Data Sheet
www.infineon.com/sensors
1
Revision 1.0
2020-07-08
KP212K1409
Analog Absolute Pressure Sensor
Table of Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1
1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.2
1.6
1.7
2
2.1
2.2
2.3
2.4
3
3.1
3.2
4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transfer Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ratiometric Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Overall Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output Voltage versus Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Timing Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Circuit Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
13
14
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PG-DSOF-8-16 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Data Sheet
2
Revision 1.0
2020-07-08
KP212K1409
Analog Absolute Pressure Sensor
Functional Description
1
Functional Description
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:
•
•
•
Minimum and maximum rated pressure
Voltage level at minimum and maximum rated pressure
Clamping levels
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
3
Revision 1.0
2020-07-08
KP212K1409
Analog Absolute Pressure Sensor
Functional Description
1.1
Pin Configuration
Figure 1
shows the pin configuration.
TEST
CLOCK / V
PROG
DATA IN
DATA OUT
1
2
3
4
8
7
6
5
GND
V
OUT
GND
V
DD
Figure 1
Pin configuration (top view, figure not to scale)
1.2
Pin Description
Table 1
shows the pin description.
Table 1
Pin No.
1
2
3
4
5
6
7
8
Pin Description
Name
TEST
CLOCK / V
PROG
DATA IN
DATA OUT
V
DD
GND
V
OUT
GND
Function
Test pin
1)
External clock for communication / programming
voltage
1)
Serial data input pin
1)
Serial data output pin
1)
Supply voltage
Circuit ground potential
2)
Analog pressure signal output
Circuit ground potential
2)
1) Digital pins are used only during calibration and test. It is recommended to leave these pins floating (in case of an open
GND connection, the floating pins prevent from a cross grounding through the corresponding ESD diodes).
2) It is recommended to connect both GND pins.
Data Sheet
4
Revision 1.0
2020-07-08
KP212K1409
Analog Absolute Pressure Sensor
Functional Description
1.3
Block Diagram
Figure 2
shows the functional block diagram.
V
DD
CLOCK /
V
PROG
DATA
IN
DATA
OUT
Internal
Reference
Voltage
EEPROM
( 90+22 bit )
Test and Programming
Interface
Digital
Control
Temperature
Compensation
V
OUT
A
D
1 kHz
Linearization
12 bit
10 bit
Clamping
10 bit
D
1 bit
A
30kHz
V
DD
Clock
Generator
OBD
GND
Figure 2
Functional block diagram
Data Sheet
5
Revision 1.0
2020-07-08
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