TLE4998C8(D)

SPC Output

Data Sheet

18

Revision 1.1, 2017-01

7.4

SPC Modes

SPC enables the use of enhanced protocol functionality due to the ability to select between “synchronous”, “range

selection” and “ID selection” protocol mode. The ID register is only used in ID selection mode.

7.4.1

Synchronous Transmission

In the “synchronous” mode, the sensor (slave) starts to transfer a complete data frame only after a low pulse is

forced by the master on the OUT pin. This means that the data line is bidirectional - an open drain output of the

micro controller (master) sends the trigger pulse. The sensor then initiates a sync pulse and starts to calculate the

new output data value. After the synchronization period, the data follows in form of a standard SENT frame,

starting with the status, data and CRC nibbles. At the end, an end pulse allows the CRC nibble decoding and

indicates that the data line is idle again. The timing diagram in Figure 7-1 visualizes a synchronous transmission.

Figure 7-3

Bidirectional Communication in Synchronous Mode

7.4.2

Synchronous Transmission Including Range Selection

The low time duration of the master can be used to select the magnetic range of the sensor in SPC dynamic range

selection mode.

Table 7-5

SPC Mode Selection

Mode

Parameter Prot MSB

Parameter Prot LSB

Synchronous

0

No effect

Dynamic range selection

1

0

ID selection

1

1

Table 7-6

Master Pulse Timing for Synchronous Mode

Parameter

Symbol

Values

Unit

Note / Test Condition

Min.

Typ.

Max.

Master low time

t

mlow

1.5

2.75

4

1) UT = Programmed nominal SPC unit time.

–

Table 7-7

Master Pulse Timing for Dynamic Range Mode

Parameter

Symbol

Values

Unit

Note / Test Condition

Min.

Typ.

Max.

Master low time

t

mlow

1.5

3.25

5

1) UT = Programmed nominal SPC unit time.

Range = 200 mT (

9

12

15

UT

Range = 100 mT (

24

31.5

39

UT

Range = 50 mT (

Sensor

CPU

VDD

OUT

GND

Capcom-Unit

Outpin (OD)