TLE6288R datasheet(14/23 Pages) INFINEON

14 / 23 page

Preliminary Datasheet TLE6288 R

Vp2

Page 14

13.01.2003

Diagnostics

detailled description of the diagnosis will be added

SPI

The SPI is a Serial Peripheral Interface with 4 digital pins

and an 16 bit shift register. The SPI is used to configure

and program the device, turn on and off channels and to

read detailled diagnostic information.

8.1

SPI Signal Description:

CS - Chip Select. The system microcontroller selects the TLE 6288 R by means of the CS pin. When-

ever the pin is in a logic low state, data can be transferred from the µC and vice versa.

CS = H : Any signals at the SCLK and SI pins are ignored and SO is forced into a high impedance

state.

CS = H L :

• diagnostic information is transferred from

the diagnosis register into the SPI shift

• serial input data can be clocked into the

SPI shift register from then on

• SO changes from high impedance state to

logic high or low state corresponding to

the SO bits

CS = L : SPI is working like a shift register. With each clock signal the state of the SI is read into the

SPI shift-register and one diagnosis bit is written out of SO.

CS = L H:

• transfer of SI bits from SPI shift register into the internal logic registers

• reset of diagnosis register if sent command was valid

To avoid any false clocking the serial clock input pin SCLK should be logic high state (if CKLProg=L;

low state if CLKProg=H) during high to low transition of CS .

SCLK - Serial Clock. The serial clock pin clocks the internal SPI shift register of the TLE 6288 R. The

serial input (SI) accepts data into the input SPI shift register on the rising edge of SCLK (if CKLProg=L;

falling edge if CLKProg=H) while the serial output (SO) shifts diagnostic information out of the SPI shift

the SCLK pin is in a logic high state (if CKLProg=L; low state if CLKProg=H) whenever chip select CS

makes any transition.

SI - Serial Input. Serial data bits are shifted in at this pin, the most significant bit (MSB) first. SI infor-

mation is read in on the rising edge of SCLK (if CKLProg=L; falling edge if CLKProg=H). Input data is

latched in the SPI shift register and then transferred to the internal registers of the logic.

The input data consist of 16 bit, made up of 4 control bits and 12 data bits. The control word is used to

program the device, to operate it in a certain mode as well as providing diagnostic information (see SPI

Commands).

SO - Serial Output. Diagnostic data bits are shifted out serially at this pin, the most significant bit (MSB)

first. SO is in a high impedance state until the CS pin goes to a logic low state. New diagnostic data will

appear at the SO pin following the falling edge of SCLK (if CKLProg=L; rising edge if CLKProg=H).

SPI

SCLK

internal logic registers

diagnosis register

16 bit SPI shift register

MSB

LSB

Serial input

data MSB first

Serial output

(diagnosis)

MSB first

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