TLE4990

Programmable Linear Hall Sensor

Calibration and Fusing

Data Sheet

19

V 2.4, 2005-11

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.