TLE4998C8D Grade1

SPC Output Definition

Technical Product Description

21

Revision 1.0, 2014-05-21

The CRC checksum includes the status nibble and the data nibbles and can be used to check the validity of the

decoded data. The sensor is available for the next sample 90 μs after the falling edge of the end pulse. The

sampling time (when values are taken for temperature compensation) is always defined as the beginning of the

synchronization period. During this period, the resulting data is always calculated from scratch.

The number of transmitted SPC nibbles is programmable to customize the amount of information sent by the

sensor. The frame contains a 16 bit Hall value and an 8bit temperature value in the full configuration.

The temperature is coded as an 8 bit value. The value is transferred in unsigned integer format and corresponds

to the range between -55 °C and +200 °C, so a transferred value of 55 corresponds to 0 °C. The temperature is

additional information and although it is not calibrated, may be used for a plausibility check, for example. Table 9-5

shows the mapping between junction temperature and the transmitted value in the SPC frame.

The status nibble allows to check internal states and conditions of the sensor.

•

Depending on the selected SPC mode, the first two bits of the status nibble contain either the selected

magnetic range or the ID of the sensor and allow therefore an easy interpretation of the received data.

•

The third bit is set to 1 for the first transmission after the sensor returns from an overvoltage operation with

•

The fourth bit is switched to 1 for the first data package transferred after a reset. This allows the detection of

low-voltage situations or EMC problems of the sensor.

Table 9-3

Frame Register

Parameter

Symbol

Values

Unit

Note / Test Condition

Min.

Typ.

Max.

Frame register

F

2

bit

–

Table 9-4

Frame Selection

Frame Type

Parameter F

Data Nibbles

16 bit Hall, 8 bit temperature

0

6 nibbles

16 bit Hall

1

4 nibbles

12 bit Hall, 8 bit temperature

2

5 nibbles

12 bit Hall

3

3 nibbles

Table 9-5

Mapping of Temperature Value

Junction Temperature

Typ. Decimal Value from Sensor

Note

- 55 °C

0

1) Theoretical range of temperature values, not operating temperature range.

0°C

55

–

25 °C

80

–

200 °C

255

Theoretical upper limit1)