List of Figures
Figure 1: Example of a data frame with 10 data bits (D0-D9), 2 start bits (S1,S2) and one parity bit (P). ....... 9
Figure 2: Different parts of the PSI5 data frame .......................................................................................... 10
Figure 3: Scaling of data range .................................................................................................................. 11
Figure 4: Serial data frame generated by the two messaging bits of the sensor data frame (messaging channel)
.................................................................................................................................................................. 12
Figure 5: ECU to sensor communication with Tooth Gap method ............................................................... 13
Figure 6: Data frames 1-3 for ECU to sensor communication with Tooth Gap method ................................ 13
Figure 7: ECU to sensor communication with Pulse Width method ............................................................. 14
Figure 8: Data frame 4 for ECU to sensor communication with Pulse Width method ................................... 14
Figure 9: Mapping of frames 1-3 into frame 4 ............................................................................................. 15
Figure 10: Bit Data word example with 3-Bit CRC ....................................................................................... 16
Figure 11: Reading order for checksum generation in sensor to ECU serial communication ........................ 17
Figure 12: Example for checksum generation, 12-Bit data field, 8-Bit message ID and 6-Bit CRC for sensor to
ECU serial communication channel ............................................................................................................ 17
Figure 13: Supply line model for PSI5 ........................................................................................................ 18
Figure 14: Single sensor configuration (simplified diagram) ........................................................................ 19
Figure 15: Synchronous parallel bus mode (simplified schematic) .............................................................. 20
Figure 16: Example for a pass-through configuration (simplified schematic) ............................................... 21
Figure 17: Example for a splice configuration (simplified schematic) ........................................................... 21
Figure 18: Synchronous daisy chain bus (simplified schematic) .................................................................. 22
Figure 19: Bit encoding and data frame timing for sensor to ECU communication ....................................... 23
Figure 20: Bit encoding according to the Tooth Gap method ....................................................................... 24
Figure 21: Bit encoding via Pulse Width method ......................................................................................... 25
Figure 22: System current and voltage definitions....................................................................................... 26
Figure 23: Reference circuit for sensor damping behavior .......................................................................... 31
Figure 24: Reference circuit for sensor testing ............................................................................................ 32
Figure 25: Reference circuit for ECU testing ............................................................................................... 32
Figure 26: Dynamic behavior of supply / communication current ................................................................. 33
Figure 27: Shape and timing of synchronization signal at ECU ................................................................... 35
Figure 28: Synchronization signal detection in the sensor ........................................................................... 37
Figure 29: Timing of synchronous operation ............................................................................................... 39
Figure 30: Current consumption during startup for sensor bus configuration ............................................... 41
Figure 31: Current consumption during start up for certain single sensor configurations.............................. 42
Figure 32: Undervoltage reset behavior ...................................................................................................... 43
Figure 33: Mapping of status and initialization data into a data word ........................................................... 46
Figure 34: Sensor initialization sequence for Data Range Initialization ........................................................ 47
Figure 35: Block ID and data nibbles .......................................................................................................... 48
Figure 36: Startup sequence ...................................................................................................................... 48
