TLE4959CFX datasheet(13/20 Pages) INFINEON

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Data Sheet

1.0

2018-02

TLE4959C FX Flexible Transmission Speed Sensor

EEPROM Functional Description

4.1

Serial Interface

The serial interface is used to set parameter and to program the sensor IC, it allows writing and reading of

internal registers. Data transmission to the IC is done by supply voltage modulation, by providing the clock

timing and data information via only one line. Data from the IC are delivered via the output line, triggered by

as well clocking the supply line. In normal application operation the interface is not active, for entering that

mode a certain command right after power-on is required.

A detailed document (TLE4959C FX EEPROM Programming Guide) is available on request. It contains the

description of electrical timing and voltage requirements, as well as the information about data protocol,

available registers and addresses.

4.1.1

Data Transmission

Commands to the sensor are sent by modulating the supply voltage between two levels VDD,high and VDD,low.

They are sent in series of 17 pulses corresponding to 16 bit words, with MSB transmitted first and LSB last,

respectively the stop bit. Each of the 16 pulses is coded by the duty cycle as logical “0” or “1”. Logical "1" is

represented by a duty cycle of 2/3 of the period on VDD,high, logical “0” is represented by a duty cycle of 1/3 at

VDD,high. This forms the bit information and acts also as serial interface clock. Data transmission from the device

is represented by the state of the output, high for logical “1” and low for logical “0”. Recommended period

length is around 200 (tbd) µs per bit.

End of word is indicated by a long "low" supply (> 750 ms, first 30 ms should be > VDD,high, remaining time

< VDD,low). Please note, that for transmission of 16 data bits in total 17 pulses on VDD are necessary. If more than

16 input bits are transmitted the output bits are irrelevant (transmission buffer empty), whereas the input bits

remain valid and start overwriting the previously transmitted bits. In any case the last 17 transmitted bits are

interpreted as transmitted data word (16 bit) + 1 stop bit.

Figure 6

Serial Protocol

tbit tbit tbit tbit tbit tbit

thigh tlow

0 0 0 1

1 1

1 0

MSB

LSB Stop_bit=0

tON

tSupply ,enter

VDD

VDD,low

VDD,high

time

pulse1……

pulse17

tdig_reset

tSupplyhigh,exit

tstop

MSB

LSB

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