TLE4990_05 Datasheet, PDF (19/24 Pages) Infineon Technologies AG – Programmable Linear Output Hall Sensor

TLE4990
Programmable Linear Hall Sensor
Calibration and Fusing
8
Calibration and Fusing
Usually the sensor is calibrated ’End Of Line’, when the complete magnetic system is
assembled. This compensates all magnetic and mechanical tolerances.
Note: The -E6782 version is already programmed completely. The contents of the
calibration OTP memory may not be changed furthermore.
During the calibration the internal settings are stored in a RAM. When the right values
are found, the information has to be stored in an one-time-programmable memory
(OTP).
This OTP memory consists of cavity fuses.
After fusing all bits, setting the MEMLOCK bit closes the memory. This prevents from
unwanted memory changes after the calibration
Data Transfer Protocol
A separate programming specification may be requested.
Programming of Sensors with Common Supply Lines
In many automotive applications two sensors are used to measure the same parameter.
This redundancy allows to continue the operation in an emergency mode. If both sensors
use the same power supply lines, they have to be programmed together.
Sensor Interface Tool
For the calibration of the sensor, a special hardware interface to a PC is required.
Data Sheet
19
V 2.4, 2005-11