TLE75602-ESH datasheet(57/82 Pages) INFINEON

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Datasheet

57

Rev. 1.0

2017-11-23

TLE75602-ESH

SPIDER+ 12V

Serial Peripheral Interface (SPI)

10

Serial Peripheral Interface (SPI)

The serial peripheral interface (SPI) is a full duplex synchronous serial slave interface, which uses four lines:

SO, SI, SCLK and CSN. Data is transferred by the lines SI and SO at the rate given by SCLK. The falling edge of

CSN indicates the beginning of an access. Data is sampled in on line SI at the falling edge of SCLK and shifted

out on line SO at the rising edge of SCLK. Each access must be terminated by a rising edge of CSN. A modulo

8/16 counter ensures that data is taken only when a multiple of 8 bit has been transferred after the first 16 bits.

Otherwise a TER bit is asserted. In this way the interface provides daisy chain capability with 16 bit as well as

with 8 bit SPI devices.

Figure 31 Serial Peripheral Interface

10.1

SPI Signal Description

CSN - Chip Select

The system microcontroller selects the TLE75602-ESH by means of the CSN pin. Whenever the pin is in “low”

state, data transfer can take place. When CSN is in "high" state, any signals at the SCLK and SI pins are ignored

and SO is forced into a high impedance state.

CSN “high” to “low” Transition

• The requested information is transferred into the shift register.

• SO changes from high impedance state to "high" or “low” state depending on the logic OR combination

between the transmission error flag (TER) and the signal level at pin SI. This allows to detect a faulty

transmission even in daisy chain configuration.

• If the device is in Sleep mode, SO pin remains in high impedance state and no SPI transmission occurs.

Figure 32

Combinatorial Logic for TER bit

14

13

12

11

14

13

12

11

MSB

SPI _16bit.emf

LSB

6

5

4

3

2

1

LSB

6

5

4

3

2

1

10

9

8

10

9

8

7

SO

SI

CSN

SCLK

time

SPI _TER.emf

SI

SPI

OR

TER

0

1

SO

CSN

SCLK

S

SO

S

SI

Số phần tương tự - TLE75602-ESH

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