TLE5012B

Specification

Data Sheet

38

Rev. 2.0, 2014-02

4.4.3.2

Master Trigger Pulse Requirements

An SPC transmission is initiated by a master trigger pulse on the IFA pin. To detect a low-level on the IFA pin, the

If the master low time exceeds the maximum low time, the sensor does not respond and is available for a next

triggering 30

μs after the master pulse crosses V

in the sensor and the triggering of the ECU.

Figure 4-16 SPC Master pulse timing

4.4.3.3

Checksum Nibble Details

The checksum nibble is a 4-bit CRC of the data nibbles including the status nibble. The CRC is calculated using

CRC.

Table 4-22 Master pulse parameters

Parameter

Symbol

Values

Unit

Note / Test Condition

Min.

Typ.

Max.

Threshold

V

th

50

% of

1)

1) Not subject to production test - verified by design/characterization

Threshold hysteresis

V

thhyst

8% of

1)

1)

Total trigger time

t

mtr

90

UT

SPC_Trigger = 0;1)2)

2) Trigger time in the sensor is fixed to the number of units specified in the “typ.” column, but the effective trigger time varies

due to the sensor’s clock variation

+12

UT

SP_Trigger = 11)

Master low time

t

mlow

8

12

14 UT

S_NR =001)

16

22

27

S_NR =011)

29

39

48

S_NR =101)

50

66

81

S_NR =111)

Master delay time

t

md,tot

5.8

μs

1)

SPC

ECU trigger

level