TLI5012BE1000_15 Datasheet, PDF (31/37 Pages) Infineon Technologies AG – GMR-Based Angle Sensor

TLI5012B E1000
Specification
• In case an overflow occurs at address 3F_H, the transfer continues at address 00_H.
• 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 TLI5012B E1000. This allows a fast readout of one register.
• At a rising edge of CSQ without a preceding data transfer (no SCK pulse, see Figure 4-13), 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 t_CSoff.
• By default, the SSC interface is set to push-pull. The push-pull driver is active only if the TLI5012B E1000 has
to send data, otherwise the DATA pin is set to high-impedance.
Cyclic Redundancy Check (CRC)
• This CRC is according to the J1850 Bus Specification.
• Every new transfer restarts the CRC generation.
• Every Byte of a transfer will be taken into account to generate the CRC (also the sent command(s)).
• Generator polynomial: X8+X4+X3+X2+1, but for the CRC generation the fast-CRC generation circuit is used
(see Figure 4-14)
• The seed value of the fast CRC circuit is ’11111111_B’.
• The remainder is inverted before transmission.
Serial
CRC
output
X7
X6
X5
X4
1
1
1
1
X3
xor
1
X2
xor
1
X1
X0
xor
1
1
parallel
Remainder
Figure 4-14 Fast CRC polynomial division circuit
& xor
Input
TX_CRC
Data Sheet
31
Rev. 1.1, 2015-09