Table 29

SPC Unit Times

Parameter

Symbol

Values

Unit

Note or condition

Min.

Typ.

Max.

SPC unit time

UT

0.75

-

3.0

µs

default 3.0µs, configurable steps (0.75, 1,

1.25,1.5, 2.0, 2.5, 3.0), tolerance given by clock

tolerance

5.2.3.1

SPC Bus Mode

When the sensor is used in bus mode with other sensors on a common SPC line, individual addresses have to be

assigned to each sensor for identification. For the operation of the sensor in a SPC bus mode, it is strongly

recommended that the sensor ID is written into the EEPROM of the sensor, as all sensors are preconfigured with the

default value “ID = 0”.

A corresponding trigger nibble from the microcontroller can address each individual sensor. Each trigger nibble low

time corresponds to an individual sensor address. The total length of the trigger nibble can be selected to be constant

at 90 UT (constant trigger length) or variable (variable trigger length).

5.2.3.2

SPC master trigger pulse

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

below the threshold Vth . The sensor detects that the output line has been released as soon as Vth is crossed. Figure

"SPC Master pulse timing" shows the timing definitions for the master pulse. The master low time tmlow is given

in table "SPC trigger for bus mode". The total trigger time tmtr is given in table "SPC master pulse timing".

SPC

Vth, falling

tmlow

tmtr

Vth, rising

Figure 15

SPC master pulse timing

Table 30

Sensor SPC trigger parameters

Parameter

Symbol

Values

Unit

Note / Test

condition

Min.

Typ.

Max.

Master nibble

low time

tmlow

2

-

5

UT

synchronous m

ode, UT ≥ 1.5

μs

Master nibble

low time

tmlow

2

-

7

UT

synchronous m

ode, UT ≤

1.25

μs

(table continues...)

TLE49SR

Datasheet

5  Specific module descriptions

Datasheet

26

Rev. 1.1.1

2024-03-13