Datasheet KP276A1201 (Infineon) - 8

link to page 18 link to page 18 link to page 8
CONFIDENTIAL KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6 SENT interface
The SENT interface enables communication according to the SENT (Single Edge Nibble Transmission) specification. The SENT protocol specifies the transmission of information in a series of pulses with data encoded as falling edge to falling edge periods. Each following pulse is called a nibble. The SENT interface transmits messages organized in frames. Each frame consists of several pulses which are delimited by falling edges. Each falling edge marks the start of a new nibble. •
KP276A1201 SENT configuration shorthand definition:
SENT2016-03.0us-6dn-ppc(282.0)-esp-A.5
1.6.1 Physical layer
The physical layer provides the method of transferring digital data encoded as time between two falling edges of a signal through the communication medium. It consists of power, ground and the signal wire (see
Figure 16
). The basic unit of time for the SENT interface is called a clock tick. The transmission bit rate depends on the data value sent and the sensor clock tolerance. The shortest length of a nibble pulse consists of 12 ticks (nominally 36 µs), the maximum length is 27 ticks (nominally 81 µs).
Figure 6
shows the physical layer specification of a nibble. V voltage OH 3.8 V 1.1 V VOL t t time fall rise >4 ticks n ticks + Δtfall
Figure 6 Physical layer specification of a nibble 1.6.2 Data link layer
The SENT interface has two channels for transmitting information: • Fast channel • Slow channel The fast channel represents the information transmitted in the data pulses of the SENT frame. Within a single SENT frame a full pressure code and full NTC code is transmitted. The slow channel represents the information transmitted within the status and serial communication nibble. On this channel information is transmitted over several SENT frames (4 bits per SENT frame). This information consists of diagnostic codes and serial messages. The SENT frame starts with a synchronization and calibration pulse which is used by the receiver to synchronize with the frame and to create a reference for the length measurement of the following nibbles. The synchronization pulse is followed by a status and serial communication nibble. The value coded in this nibble represents a series of 4 bits. While bit #0 and bit #1 are reserved, bit #2 and bit #3 are used to communicate serial messages. Datasheet 8 Revision 1.0 2019-01-25 Document Outline dTurboTMAP with SENT Output and Temperature Sensor Interface Features Potential applications Product validation Description Table of contents 1 Functional description 1.1 Pin configuration 1.2 Pin description 1.3 Block Diagram 1.4 Transfer function pressure 1.4.1 Pressure transfer function characteristics 1.4.2 Pressure accuracy 1.5 Transfer function temperature 1.5.1 Temperature transfer function characteristics 1.6 SENT interface 1.6.1 Physical layer 1.6.2 Data link layer 1.6.2.1 Nibble specification 1.6.2.2 Status and communication nibble 1.6.2.3 Enhanced serial message format 1.6.2.4 Enhanced serial message data 1.6.3 Pressure channel output codes 1.6.4 Temperature channel output codes 1.6.5 Diagnostic Error Codes 1.6.5.1 Signal out of range 1.6.5.2 Diag1 1.6.5.3 Diag2 1.6.5.4 EEPROM Check 1.6.6 Definition of Pressure signal path latency 1.7 External temperature sensor 1.7.1 Linearization of the external temperature sensor transfer function 1.7.2 Accuracy for NTC signal processing 2 Specification 2.1 Application circuit example 2.2 Application circuit example for EMC 2.3 Absolute maximum ratings 2.4 Operating range 2.5 Characteristics 3 Package information 3.1 PG-DSOF-8-162 Outline 3.2 Identification code Revision history Disclaimer