KP254XTMA2

Digital Absolute Pressure Sensor KP254 dBAP Digital Barometric Air Pressure Sensor IC Data Sheet Revision 1.1, 2015-07-29 Sense & Control KP254 Digital Absolute Pressure Sensor Table of Contents 1 1.1 1.2 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Target Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 2.1 2.2 2.3 2.4 2.4.1 2.4.2 2.5 2.5.1 2.6 2.6.1 2.6.1.1 2.6.1.2 2.6.1.3 2.6.1.4 2.6.1.5 2.6.1.6 2.6.2 2.6.3 2.7 2.8 2.8.1 2.8.1.1 2.8.1.2 2.8.2 2.8.3 2.8.4 2.8.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Transfer Function Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pressure Transfer Function Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Transfer Function Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Temperature Transfer Function Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Command Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Command Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Communication Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Identifier Response Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Single Device Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Daisy Chain Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Start-up Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Diagnostic Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Reset-bit C12 = ‘0‘ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Reset-bit C12 = ‘1‘ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Pressure out of Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Diag1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Diag2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 E2PROM Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3 3.1 3.2 3.3 3.4 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Application Circuit Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4 4.1 4.2 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 PG-DSOF-8-16 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Data Sheet 2 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Data Sheet Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pressure transfer function characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Temperature transfer function characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Diagnosis codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Component values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 SPI timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Data Sheet Pin configuration (top view, figure not to scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pressure transfer function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Accuracy for pressure acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Temperature transfer function (VDD = 5.0 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 SPI timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SPI command structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SPI response structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SPI response structure for identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Acquire pressure command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Acquire temperature command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Trigger diagnosis command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Acquire identifier command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Trigger test mode command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Response after a communication error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Identifier response definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Example for single device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Example for single device signal timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Example for daisy chain operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Example for daisy chain signal diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Example for reset strategy Reset-bit C12 = ‘0‘. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Example for reset strategy Reset-bit C12 = ‘1‘. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Diag1 functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Diag2 functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Application circuit example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Identification code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor 1 Product Description The KP254 is a miniaturized Digital Barometric 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 a 10-bit digital value and sends the information via the SPI interface. In addition, a temperature sensor is integrated on chip. Based on the received SPI command, the 10-bit temperature information will be transmitted via the SPI interface. A special reliability feature is the integrated diagnostic mode, which allows testing the sensor cells as well as the signal path. This diagnosis can be simply triggered with a SPI command. PG-DSOF-8-16 The chip is packaged in a “green” SMD housing. The sensor has been primarily developed for measuring barometric air pressure, but can also be used in other application fields. The high accuracy, high sensitivity and reliability features of the device makes it a perfect fit for advanced automotive applications as well as in industrial and consumer applications. 1.1 Features The following features are supported by the KP254: • High accuracy pressure sensing (± 1.5 kPa) • Real 10-bit pressure resolution • Integrated temperature sensor • Real 10-bit temperature resolution • Self diagnosis features • “Green” 8 pin SMD housing • Automotive qualified 1.2 Target Applications The KP254 is designed for use in the following target applications: • Automotive applications • Industrial control • Consumer applications • Medical applications • Weather stations • Altimeters Product Name Product Type Ordering Code Package Digital Absolute Pressure Sensor KP254 SP001399094 PG-DSOF-8-16 Data Sheet 5 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2 Functional Description 2.1 Pin Configuration Figure 1 shows the pin configuration. NCS 1 8 GND CLK 2 7 NC SDI 3 6 VPROG SDO 4 5 VDD Figure 1 Pin configuration (top view, figure not to scale) 2.2 Pin Description Table 1 shows the pin description. Table 1 Pin description Pin No. Name Function Comment 1 NCS Not-Chip-Select (active-low) Communication is enabled when NCS is low 2 CLK Serial Clock External clock for serial communication 3 SDI Serial Data In Serial data input (e.g. from a controller) 4 SDO Serial Data Out Tri-state serial data output 5 VDD Supply voltage – 6 VPROG Programming Voltage Only required during E2PROM programming 7 NC Not Connected Pin is not bonded 8 GND Ground – Data Sheet 6 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.3 Block Diagram Figure 2 shows the functional block diagram. Pressure Cells NCS Normal Mode/ Diagnosis Mode ADC Digital Signal Temperature Sensor Digital Core CLK SPI Interface SDI Processing ADC SDO Temperature Compensation Voltage Regulator VDD analog digital E²PROM Interface VDDA VDDD E²PROM VPROG Reset GND NC Figure 2 Functional block diagram 2.4 Transfer Function Pressure output signal [LSB] The KP254 device is fully calibrated on delivery. The sensor has a linear transfer function between the applied pressure and the digital output signal. 1023 Zo o 511 m 0 0 20 40 60 80 100 120 140 160 180 200 pressure [kPa] operating pressure range maximum input pressure range Figure 3 Data Sheet Pressure transfer function 7 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.4.1 Pressure Transfer Function Characteristics The following calibration is adjusted with the parameters Sp and offsp pamb Table 2 = out p − offs p Sp Pressure transfer function characteristics Pressure Output Code Gain and Offset Symbol Values Unit Symbol Values Unit Symbol Value Unit pIN,1 40 kPa LSBOUT,1 0 LSB Sp 13.64 LSB/kPa pIN,2 115 kPa LSBOUT,2 1023 LSB offsp -545.6 LSB Note: The points pIN,1/LSBOUT,1 and pIN,2/LSBOUT,2 define the calibrated transfer function and not the operating range. The operating pressure range is defined by the parameter 2.8 “Ambient operating pressure range” on Page 22 Accuracy 2.0 3.0 1.8 2.5 1.6 1.4 1.2 absolute error [kPa] error multiplier 2.4.2 1.5 1.0 0.8 0.6 0.4 0.2 0.0 -40 Figure 4 Data Sheet 0 85 125 temperature [°C] Accuracy for pressure acquisition 8 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.5 Transfer Function Temperature output signal [LSB] Triggering the temperature command (see Section 2.6.1.4) the KP254 provides the ambient temperature. 1023 Zo 511 om 0 -40 -20 0 40 20 60 80 120 140 160 temperature [°C] 100 operating temperaturerange Figure 5 Temperature transfer function (VDD = 5.0 V) 2.5.1 Temperature Transfer Function Characteristics The following calibration is adjusted with the parameters ST and offsT: Tamb Table 3 = outT − offsT ST Temperature transfer function characteristics Temperature Output Code Gain and Offset Symbol Values Unit Symbol Values Unit Symbol TIN,1_5.01) -40 °C LSBOUT,1 0 LSB ST TIN,2_5.0 1) 160 °C LSBOUT,2 1023 LSB 2) offsT_3.3 offsT_5.01) Value Unit 5.115 LSB/°C 209.6 204.6 LSB LSB 1) Valid for VDD = 5.0 V 2) Valid for VDD = 3.3 V Note: The points TIN,1/LSBOUT,1 and TIN,2/LSBOUT,2 define the calibrated transfer function and not the operating range. The operating temperature range is defined by the parameter 2.7 “Operating temperature” on Page 22 Data Sheet 9 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.6 Serial Interface The communication and data transmission is based on a standard 16 bit serial peripheral interface (SPI). NCS t sclch thclcl tclh t cll t sclcl thclch tonncs SCLK t csdv t pcld t pchdz SDO MSB tscld SDI LSB t hcld MSB Figure 6 SPI timing 2.6.1 Commands LSB The following Commands are defined: • Acquire identifier • Acquire pressure (incl. the diagnosis pressure out of range, E2PROM check and last updated Diag1 & Diag2)1) • Acquire temperature (incl. the diagnosis pressure out of range, E2PROM check and last updated Diag1 & Diag2)1) • Trigger diagnosis (triggers Diag1 and Diag2) • Trigger test mode (entry into test mode only occurs if this is the first command received after power up, in conjunction with a high voltage level (>10V) on pin VPROG) 2.6.1.1 Command Behavior The SPI command interpretation is based on following rules: • The response to command N is the result of the previous command (N-1) • The response to the first command is the identifier • When a command (N) is sent and the processing of the previous command (N-1) has not finalized, the last command (N) will not interrupt the processing • Max. one command is stacked (during processing a command a new received command is stacked; further received commands will overwrite the stack) • If a command has finished, the sensor takes the next command from the stack; if no command is in the stack, the sensor goes into the pressure measurement mode 1) Last updated diagnosis information is only available if the Trigger diagnosis command was sent at any time before and the diagnostic reset is not active (Reset-bit C12 = ‘1‘, see Chapter 2.8.1). Data Sheet 10 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description • The diagnosis command triggers the Diag1 and Diag2 measurement; during this time pressure values (including out of range information) will not be updated • Pressure and temperature values can be updated continuously based on a parallel acquisition 2.6.1.2 Structure The following structure is defined for an SPI command: 15 14 13 12 11 10 9 8 7 6 5 RESET ADDITIONAL BIT REQUEST REQUEST 4 3 2 1 `0` MSB Figure 7 15 LSB SPI command structure 14 13 12 11 10 9 8 7 6 5 4 3 2 1 MSB 15 0 PARIT Y DATA DIAGNOSIS Figure 8 0 LSB SPI response structure 14 SUPPLIER 13 12 11 SILICON VERSION 10 9 8 7 METAL VERSION 6 5 4 3 2 1 0 ASIC NAME MSB LSB Figure 9 SPI response structure for identifier 2.6.1.3 Parity Except for the identifier response (see Section 2.6.1.6) every SPI response (including the Communication Error response, see Section 2.6.1.5) includes an odd parity (LSB, [0]). The number of bits with the value one in the 16 bit response is odd (including the parity bit). Data Sheet 11 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.6.1.4 Command Definition 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 1 X 0 0 0 0 0 0 0 0 0 0 0 0 Figure 10 Acquire pressure command 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 0 X 0 0 0 0 0 0 0 0 0 0 0 0 Figure 11 Acquire temperature command 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 0 0 X 0 0 0 0 0 0 0 0 0 0 0 0 Figure 12 Trigger diagnosis command 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 1 1 X 0 0 0 0 0 0 0 0 0 0 0 0 Figure 13 Acquire identifier command Note: The Reset-bit (C12) determines how the diagnostic reset is handled. For details about the function of the Reset-bit refer to Chapter 2.8.1. The “trigger test mode” command is only for information. The test mode is only for calibration and E2PROM programming. Both are already done during the supplier’s back-end assembly. The information should serve to avoid command for unintentional test mode operation. Note: Additional safeguards are provided to prevent unintentional test mode operation. For test mode operation, the command must be the first command after power-up in combination with a high voltage level at pin VPROG. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 Figure 14 Data Sheet Trigger test mode command 12 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.6.1.5 Communication Error In normal operation only the pressure, temperature, diagnosis and identifier commands are valid. Every abnormality of these commands (e.g. unused command, other value of unused bits, number of clocks not equal to 16n with n = 1, 2, 3...) will result in a communication error. The response to a detected communication error is given below. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 Figure 15 Response after a communication error 2.6.1.6 Identifier Response Definition The response to an Acquire identifier command is a fixed value as stated below. With this response, the KP254 sensor can be indentified when operated in a bus system with several different parts. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 0 1 0 0 0 1 0 0 1 1 0 1 1 1 Figure 16 Data Sheet Identifier response definition 13 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.6.2 Single Device Operation Figure 17 shows an example on how to connect a singe device to a microcontroller. After NCS is pulled to low, the request command is sent to the sensor with the next 16 cycles of the CLK. The response of the sensor for the previous request command is returned at the same time. The SPI signal timing is shown in Figure 18. MDI MDO NCS CLK µC SDO SDI NCS CLK NCS low for 16 CLK pulses KP25x Figure 17 Example for single device operation NCS CLK 16 CLK cycles ... 16 CLK cycles ... MDO COMMAND_n COMMAND_n+1 MDI ANSWER_n-1 ANSWER_n time Figure 18 Data Sheet Example for single device signal timing 14 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description 2.6.3 Daisy Chain Operation The sensors can be connected to one SPI connection in daisy chain operation to save microcontroller pins. The number of sensors connected in daisy chain operation is unlimited. MDI NCS_S3 NCS_S2 NCS_S1 CLK MDO µC SDI NCS_S1 CLK NCS_S1 low for 16 CLK pulses SDO KP25x_1.1 CLK SDO SDI KP25x_2.1 NCS_S2 SDI NCS_S2 CLK NCS_S2 low for 32 CLK pulses SDO KP25x_2.2 KP25x_3.1 Figure 19 SDI CLK SDO KP25x_3.2 SDI NCS_S3 CLK SDO NCS_S3 SDI NCS_S3 CLK NCS_S3 low for 48 CLK pulses SDO KP25x_3.3 Example for daisy chain operation Figure 19 shows an example of a combination of daisy chain mode and parallel operation. Note: Not all five sensors in this example could be addressed at once. Only one branch can be addressed at once (e.g. the KP25x_2.x branch). Finally only one NCS line can be low at the same time (NCS_S1, NCS_S2 or NCS_S3). The responding NCS line for the addressed sensor group must be low during the complete communication. During this time the provided number of clock pulses must be the multiplication result of 16 times the number of sensors in a daisy chain (e.g. 32 clock pulses for the KP25x_2.x branch in Figure 19) Figure 20 shows the whole signal diagram. It is important that NCS_S2.1 and NCS_S2.2 stay at the low level during the complete transmission. Therewith the sensor is able after receiving more than 16 clock pulses without a change in the NCS signal to switch automatically in daisy chain mode (in this example the first received 16 bit input data by the sensor S2.1 will be clocked to the output of sensor S2.1 with the last 16 clock pulses). Data Sheet 15 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description NCS_S2.1 CLK_S2.1 SDI_S2.1 SDO_S2.1 COMMAND_S2.2_n COMMAND_S2.1_n ANSWER_S2.1_n-1 COMMAND_S2.2_n ANSWER_S2.1_n-1 COMMAND_S2.2_n ANSWER_S2.2_n-1 ANSWER_S2.1_n-1 NCS_S2.2 CLK_S2.2 SDI_S2.2 SDO_S2.2 time Figure 20 Example for daisy chain signal diagram It is important that the number of clock pulses is a multiple of 16. Otherwise all commands for a daisy chain branch will be identified as invalid commands and the response of all sensors on this branch will be 01H. 2.7 Start-up Behavior During the start-up phase (tstart-up), there is no response on any commands. 2.8 Diagnosis The sensor is able to detect automatically the following malfunctions: • Pressure out of range • Signal path check (Diag1) • Sensor cell check (Diag2) • E2PROM check If a malfunction is detected, the responding diagnosis code is sent with the next response. Note: The Diag1 and Diag2 test can only be triggered by a separate SPI command. If more than one test fails, only that diagnosis code with the highest priority will be sent. Data Sheet 16 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description Table 4 Diagnosis codes Failure Priority Diagnosis Code E2PROM: FEC error 1 1 0 0 0 0 Acquisition chain failure: Diag1 2 0 1 0 0 0 Sensor cell failure: Diag21) 3 0 0 1 0 0 Pressure out of range: High 4 0 0 0 1 0 Pressure out of range: Low 5 0 0 0 0 1 0 1 0 1 0 1) No error 1) Note: This diagnosis code is not valid until a self diagnosis is triggered by sending the Trigger diagnosis command. 2.8.1 Diagnostic Reset The Reset-bit (C12) of a SPI command allows using different reset strategies: • C12 = ‘0‘: All detected failures will be reset (with the exeption of FEC error • C12 = ‘1‘: A detected failure will not be reset Reset of FEC error is not possible. Once FEC error is detected and transmitted it remains until supply reset. 2.8.1.1 Reset-bit C12 = ‘0‘ A detected failure is only transmitted by the responding diagnosis code as long as the failure is present. The diagnosis code will be reset after once transmitted. Only if the failure is detected again, the diagnosis code will be transmitted again with the next response. pressure sampling e.g. pressure out of range: low failure presence command diagnosis code response 01010 00001 00001 01010 time Figure 21 Example for reset strategy Reset-bit C12 = ‘0‘ 2.8.1.2 Reset-bit C12 = ‘1‘ Once a failure is detected the responding diagnosis code will be transmitted as long as: • A failure with a higher priority is not detected • The sensor is not reset (power down) • Independent of the presence of the failure Data Sheet 17 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description pressure sampling e.g. pressure out of range: low failure presence command diagnosis code response 01010 00001 00001 00001 time Figure 22 Example for reset strategy Reset-bit C12 = ‘1‘ 2.8.2 Pressure out of Range The measured pressure is internally checked. If the pressure value falls below the lower limit or exceeds the higher limit the responding diagnosis code will be set. The limits are defined in Table 10 “Transfer function” on Page 25 2.8.3 Diag1 The Diag1 test checks the functionality of the signal path. Therefore the inputs of the sigma delta ADC are shorted. Afterwards, the system response is compared with the expected range (~ 50% of full scale range). If the system response is out of range, the diagnosis code is set. ΣΔ ADC Figure 23 Diag1 functionality 2.8.4 Diag2 Decimation Filter The Diag2 test checks the functionality of the pressure sensor cells. Therefore a malfunction (e.g. broken membrane) can be detected. The KP254 pressure sensing element is made of 2 measuring cells and 2 reference cells. In the normal mode these four cells are connected in a Wheatstone bridge configuration. In the Diag2 mode, the connection of the cells is modified as shown in Figure 24. Data Sheet 18 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Functional Description Normal Operation Diag2 Mode p U = f (p) U = f (p) p p Figure 24 Diag2 functionality 2.8.5 E2PROM Check p During the initialization phase, and after receiving a SPI command, the content of the E2PROM cells is copied into the corresponding E2PROM registers. Thereby, a parity check is done based on the parity row and column. A one bit error is corrected by the forward error correction. Any additional bit error results in an FECerror. In that case the diagnosis code 1 will be transmitted with the next response Data Sheet 19 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification 3 Specification 3.1 Application Circuit Example SPI Interface Microcontroller GND CS NCS CLK CLK NC MOSI SDI VPROG MISO SDO KP25x V DD 3.3/5.0V 100nF Figure 25 Application circuit example Table 5 Component values Component Symbol Values Min. 1) Supply Blocking Capacitor C1 30 2) Unit Typ. Max. 100 – nF 1) The use of a blocking capacitor with a nominal value of 100nF is mandatory; any drift or tolerances in capacity of standard capacitors are already considered. To avoid any measurement inaccuracy the supply blocking capacitor has to be placed as close as possible to the VDD pin, at least the distance must be less than 10 mm. 2) The minimum capacity including any variations or drift over lifetime must not undershoot this value. Data Sheet 20 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification 3.2 Absolute Maximum Ratings Table 6 Absolute maximum ratings Parameter Symbol Values Unit Note or Test Condition Number V V – Limited time: Max. 300 s 1.1 Min. Typ. Max. Voltage on any pin Vmax -0.3 – 5.5 6.0 Voltage at output pins Vmax_out -0.3 – VDD + 0.3 V – 1.2 Storage temperature TS -40 – 125 °C – 1.3 Thermal resistance Rthj-pin – – 180 K/W Thermal resistance between the die and the pins 1.4 Maximum input pressure 10 – 200 600 kPa kPa pamb_max 1.5 Limited time: Max. 300 s Attention: Stresses above the max. values listed in Table 6 “Absolute maximum ratings” 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 21 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification 3.3 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 noted otherwise. Table 7 Operating range Parameter Symbol Values Unit Min. Typ. Max. Note or Test Condition Number Supply voltage VDD3.3 VDD5.0 3.135 4.75 – – 3.475 5.25 V V 2.1 Supply voltage power up/power down gradient Vgrad 1E-5 – 1E4 V/ms 2.2 Input voltage for low level at pins NCS, CLK & SDI Vlow_in -0.3 – 0.8 V 2.3 Input voltage for high level at pins NCS, CLK & SDI Vhigh_in 2.0 – 5.5 V Even with the supply 2.4 voltage of VDD3.3_min the max. input voltage Vhigh_in is allowed; back biasing will not happen Output voltage for Vlow_out low level at pin SDO – – 0.4 V Test current at pin SDO is 2.0mA 2.5 Output voltage for Vhigh_out high level at pin SDO VDDx.x 0.4 – VDDx.x V Test current at pin SDO is 1.5mA 2.6 Operating temperature -40 – +125 °C 2.7 Ambient operating pamb pressure range 40 – 115 kPa 2.8 Lifetime1) 15 – – years 2.9 Ta tlive 1) The life time shall be considered as anticipation with regard to the product that shall not extend the agreed warranty period. Data Sheet 22 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification 3.4 Characteristics Product characteristics involve the spread of values guaranteed within the specified voltage and ambient temperature range. Typical characteristics are the median of the production. Table 8 Electrical characteristics Parameter Symbol Values Unit Note or Test Condition Number Min. Typ. Max. Supply current into IVDD VDD – – 10.0 mA 3.1 Internal pressure update rate fupdate 150 – – kHz 3.2 Pressure signal path settling time tpath_pres – – 5 ms 3.3a Temperature tpath_pres signal path settling time – – 15 ms 3.3b Start-up time tstart-up – – 10 ms Resolution of pressure transmission nres_pres n.a. 10 n.a. bits 3.5 Resolution of temperature transmission nres_temp n.a. 10 n.a. bits 3.6 Capacitive load at pins NCS, CLK & SDI Cload_in – – 14 pF 3.7 Capacitive load at pin SDO Cload_out – – 19 pF 3.8 Tri state leakage current ISDO -5 – 5 µA Hysteresis of input VSPI_Hys voltage at pins NCS, CLK & SDI 200 – – mV Current sink for NCS, CLK & SDI (each pin) -100 – – – -5 5 µA µA Data Sheet ISPI_in 23 no response on SPI 3.4 commands during the start-up time NCS = high VDD = 5V 3.9 3.10 @ Vlow_in = 0 V @ Vhigh_in = 5 V no back biasing 3.11 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification Table 9 SPI timing Parameter Symbol Values Unit Note or Test Condition Number Min. Typ. Max. Clock frequency of fSPI SPI interface 0.1 – 5 MHz No limitation with 4.1 lower frequencies, but not subject to production test Transmission tSDO_trans speed at SDO (20% - 80%) 5 – 30 ns 5 – 50 ns VSDO = 5V & Cload = 50pF VSDO = 5V & Cload = 150pF Clock high time tclh 75 – – ns 4.3 Clock low time tcll 75 – – ns 4.4 tfNCS 10 – 60 ns Pulses below the NCS 4.5 filter time will be ignored Delay between tcsdv NCS falling edge and SDO changing from tri-state to low – – 75 ns 4.6 Delay between CLK tpcld rising edge and start SDO data – – 50 ns Delay between CLK tsclch low and start NCS low 75 – – ns 4.8 thclcl Delay between NCS low and rising edge 1st CLK pulse 75 – – ns 4.9 Time between start SDI data and falling edge CLK tscld 15 – – ns 4.10 Time between falling edge CLK and end SDI data thcld 15 – – ns 4.11 100 – – ns 4.12 1) NCS filter time Delay between tsclcl falling edge lst CLK pulse and rising edge NCS Data Sheet 24 incl. tSDO_trans 4.2 4.7 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification Table 9 SPI timing (cont’d) Parameter Symbol Values Unit Note or Test Condition Number Min. Typ. Max. 100 – – ns 4.13 Delay between tpchdz rising edge NCS and end SDO data – – 75 ns 4.14 Time between rising edge NCS and falling edge next NCS 300 – – ns 4.15 Delay between rising edge NCS and rising edge CLK pulse thclch tonncs 1) not subject to production test - verified by characterization/design Table 10 Transfer function Parameter Symbol Values Unit Min. Typ. Max. Note or Test Condition Number Sensitivity pressure Sp – 13.64 – LSB /kPa 5.1 Offset pressure offsp – -545.6 – LSB 5.2 Sensitivity temperature ST – 5.115 – LSB /°C 5.3 Offset temperature offsT_3.3 – offsT_5.0 – 209.6 204.6 – – LSB LSB Accuracy pressure accp_Tmid -1.5 central temperature range – 1.5 kPa Accuracy pressure accp_Tlow low temperature range – 3 kPa -3 Accuracy pressure accp_Thigh -2.5 high temperature range Accuracy temperature Data Sheet accT -5.0 – 2.5 kPa – 5.0 °C 25 VDD = 3.3 V VDD = 5.0 V 5.4 0°C - 85°C 5.5a @-40°C 5.5b @125°C 5.5c -40°C - 125°C 5.6 accuracy is referenced to the ambient temperature Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Specification Table 10 Transfer function (cont’d) Parameter Symbol Values Min. Typ. Max. Unit Note or Test Condition Number Pressure out of range: Low plow plow_d – – 40 0d – – kPa LSB Accuracy not 5.7 considered; below/equal the value the diagnosis code is set Pressure out of range: High phigh phigh_d – – 115 1023d – – kPa LSB Accuracy not 5.8 considered; above/equal the value the diagnosis code is set Data Sheet 26 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Package Information 4 Package Information For passivation the sensor is covered with a transparent gel. 4.1 PG-DSOF-8-16 Outline OUTER DIMENSIONS DOES NOT INCLUDE PROTUSION OR INTRUSION OF 0.2 MAX. PER SIDE 1) VALID FOR THE WHOLE SEATING PLANE INCLUDED TIE BAR AREA Figure 26 Data Sheet Package outline 27 Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Package Information Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020). 4.2 Identification Code Figure 27 Sales Code B: I P K P 2 5 4 B Y Y W W Data Matrix Code 8 x 18 Dots Dot Size: 0.15 mm x 0.15 mm Date Code The identification code is provided in a machine readable format. The date and sales code are provided in human readable format. YY: WW: BE Location ´M´ = Malacca ´R´ = Regensburg Year Week Identification code The identification code for the KP254 is on the same side of the package as pin 8 (GND). For further information on alternative packages, please visit our website: http://www.infineon.com/packages. Data Sheet 28 Dimensions in mm Revision 1.1, 2015-07-29 KP254 Digital Absolute Pressure Sensor Revision History 5 Revision History KP254 Digital Absolute Pressure Sensor Revision History: 2015-07-29, Revision 1.1 Previous Revision: Revision 1.0 Page Subjects (major changes since last revision) Design improvement, new ordering code and marking Data Sheet 29 Revision 1.1 2015-07-29 Trademarks of Infineon Technologies AG AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, CoolMOS™, CoolSET™, CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I2RF™, ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, myd™, NovalithIC™, OptiMOS™, ORIGA™, POWERCODE™, PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SPOC™, SOLID FLASH™, TEMPFET™, thinQ!™, TRENCHSTOP™, TriCore™. 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Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited. Last Trademarks Update 2011-11-11 www.infineon.com Edition 2015-07-29 Published by Infineon Technologies AG 81726 Munich, Germany © 2014 Infineon Technologies AG. All Rights Reserved. Do you have a question about any aspect of this document? Email: erratum@infineon.com Document reference 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 noninfringement 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. 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