TLE5012B datasheet(33/50 Pages) INFINEON

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TLE5012B

Specification

Data Sheet

Rev. 2.0, 2014-02

Data communication via SSC

Figure 4-10 SSC bit ordering (read example)

Figure 4-11 Update of update registers

The data communication via SSC interface has the following characteristics:

•

The data transmission order is Most-Significant Bit (MSB) first, Last-Significant Bit (LSB) last.

•

Data is put on the data line with the rising edge on SCK and read with the falling edge on SCK.

•

The SSC Interface is word-aligned. All functions are activated after each transmitted word.

•

After every data transfer with ND ≥ 1, the 16-bit Safety Word is appended by the TLE5012B.

•

A “high” condition on the Chip Select pin (CSQ) of the selected TLE5012B interrupts the transfer immediately.

The CRC calculator is automatically reset.

•

After changing the data direction, a delay twr_delay (see Table 4-14) has to be implemented before continuing

the data transfer. This is necessary for internal register access.

•

If in the Command Word the number of data is greater than 1 (ND > 1), then a corresponding number of

consecutive registers is read, starting at the address given by ADDR.

•

In case an overflow occurs at address 3FH, the transfer continues at address 00H.

•

If in the Command Word the number of data is zero (ND = 0), the register at the address given by ADDR is

read, but no Safety Word is sent by the TLE5012B. This allows a fast readout of one register.

•

At a rising edge of CSQ without a preceding data transfer (no SCK pulse, see Figure 4-11), the content of all

registers which have an update buffer is saved into the buffer. This procedure serves to take a snapshot of all

relevant sensor parameters at a given time. The content of the update buffer can then be read by sending a

read command for the desired register and setting the UPD bit of the Command Word to “1”.

•

After sending the Safety Word, the transfer ends. To start another data transfer, the CSQ has to be deselected

once for at least tCSoff.

•

By default, the SSC interface is set to push-pull. The push-pull driver is active only if the TLE5012B has to send

data, otherwise the DATA pin is set to high-impedance.

SCK

DATA

MSB

CSQ

SSC Transfer

LSB

321

Command Word

Data Word (s)

SSC -Master is driving DAT A

SSC -Slave is driving DAT A

LSB

ADDR

LENGTH

LOCK

MSB

twr_delay

UPD

SCK

DATA

CSQ

LSB

MSB

Command Word

Data Word (s)

Update -Signal

Update -Event

SSC -Master is driving DAT A

SSC -Slave is driving DAT A

tCSupdate

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