TLE4998C8D Datasheet, PDF (21/28 Pages) Infineon Technologies AG – High Performance Programmable Dual Linear Hall Sensor

TLE4998C8D Grade1
SPC Output Definition
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.
Table 9-3
Parameter
Frame Register
Frame register
Symbol
F
Values
Unit
Min. Typ. Max.
2
bit
Note / Test Condition
–
Table 9-4
Frame Selection
Frame Type
Parameter F
16 bit Hall, 8 bit temperature
0
16 bit Hall
1
12 bit Hall, 8 bit temperature
2
12 bit Hall
3
Data Nibbles
6 nibbles
4 nibbles
5 nibbles
3 nibbles
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.
Table 9-5
Mapping of Temperature Value
Junction Temperature
Typ. Decimal Value from Sensor
- 55 °C
0
0 °C
55
25 °C
80
200 °C
255
1) Theoretical range of temperature values, not operating temperature range.
Note
Theoretical lower limit¹⁾
–
–
Theoretical upper limit¹⁾
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
disabled open drain stage to regular operation (see Chapter 7).
• 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.
Technical Product Description
21
Revision 1.0, 2014-05-21