Datasheet KP276C1505 (Infineon) - 9

link to page 9
CONFIDENTIAL KP276C1505 Digital Absolute Pressure Sensor Functional description
The message transmitted by the KP276C1505 contains two fast channels. Each channel is segmented in 3 data nibbles; every nibble includes 4 bits. The 12-bit pressure information is transmitted by the first fast channel, the 12-bit temperature information of the NTC by the second fast channel. 846 µs V SENT 1st fast channel 2nd fast channel 12 – 27 12 – 27 12 – 27 12 – 27 12 – 27 12 – 27 12 – 27 12 – 27 56 ticks 12 –128 ticks ticks ticks ticks ticks ticks ticks ticks ticks MSN MidN LSN LSN MidN MSN time nibble 1 2 3 1 2 3 nibble nibble nibble pulse nibble nibble nibble data data data data data data pulse nibble synchronization status & communication pressure pressure pressure temperature temperature temperature CRC pause MSN: most significant nibble (bit 11:8) MidN: middle nibble (bit 7:4) LSN: least significant nibble (bit 3:0)
Figure 7 Message transmission
The pause pulse is used to create a SENT transmission with a constant frame length of 282 clock ticks (846 µs).
1.6.2.1 Nibble specification
A nibble contains 4-bit data content. The length of a nibble defines the content of the 4 bits. The global timing of a nibble is based on ticks. The length of a tick is specified as 3 µs. The following formula defines the number of ticks (nticks) based on the nibble content (datanibble): nticks = 12 + datanibble
Figure 8
shows the nibble timing. 0 >4 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ticks 0 >12 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 time [µs] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 nibble value d d d d d d d d d d d d d d d d 0000 0010 0100 0110 1000 1010 1100 1110 b b b b b b b b 0001 0011 0101 0111 1001 1011 1101 1111 b b b b b b b b
Figure 8 Nibble timing
Datasheet 9 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