SP40T datasheet(49/71 Pages) INFINEON

49 / 71 page

Data Sheet

Revision1.1

2020-05-14

SP40T

Tire Pressure Monitoring Sensor

Functional Descriptions

Figure 5-12 RF Transmission Controller flow diagram

5.10.1

SOM and EOM Feature

The transmission controller can be configured for sending an 1 to 24 bit long start of message (SOM) pattern prior

to transmitting the payload and for appending an 1 to 8 bit long end of message (EOM) terminator at the end of

the telegram. These bits are transmitted uncoded (NRZ) with the chip-rate, i.e. twice the selected Baud-rate.

Figure 5-13 shows an example of a 9.6 kBaud transmission of a telegram consisting of a 3 bit SOM pattern,

followed by one Manchester coded data byte, and terminated by a 3 bit EOM pattern. In this example the SOM

and the EOM generate intended Manchester code violations.

Read & send data

bytes

Repeat

transmission of

payload?

Send EOM if enabled

Interframe-

Delay = 0?

Definition of first

telegram and

interframe delay

Start Transmission

Controller

Enter RF Low Power

State

yes

Resume from RF Low

Power State

Power down

requested ?

yes

Resume from RF Low

Power State

Enter Power Down

State

yes

Definition of next

telegram frame and

interframe delay.

Enter RF Low Power

State

Continue application

code

MCU off

MCU and

Transmission

Controller off

MCU off

Transmission

Controller off

Start

Calibrations and

configurations

Color code:

Carried out by MCU

Carried out by

transmission controller

Interframe delay

Send SOM if enabled

SP40T Datasheet(PDF) 49 Page - Infineon Technologies AG

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