tle4982c Infineon Technologies Corporation, tle4982c Datasheet - Page 11

• Manufacturer Part Number: tle4982c
• Description: Programmable True Power On Hall Sensor
• Manufacturer: Infineon Technologies Corporation

A second form of programming the static threshold value is to bring the IC in front of a
target, which delivers a static magnetic field with a suitable strength and perform a
power on by forcing the output to a low state for at least 1ms. This brings the chip in the
testmode and he starts immediately a successive approximation and adjusts the value
of the offset-DAC to the switching level that corresponds to the field strength.
Use the following procedure for this type of programming:
1) Apply a static magnetic field with a suitable strength.
2) Enter the testmode with the first procedure described in the chapter “Physical
3) Wait until the IC has made the successive approximation and reached the right level
4) Choose a k-factor and supply a programming voltage/current to the output.
5) Write the three following bit-combinations via the serial interface:
6) Leave the testmode by writing a long “high” voltage level.
It has to be noted that the chip has increased power dissipation during programming for
blowing the fuses. The additional power is taken out of the output.
Please ask your local support for detailed instruction how to program TLE4982C.
Overvoltage protection:
The process used for production has a breakthrough voltage of approximately 27.5V.
The chip can be brought into breakthrough without damage if the breakthrough power
(current) is limited to a certain value. Usually destruction is caused by overheating the
device. Therefore for short pulses the breakthrough power can be higher than for long
duration stress. For example for load dump conditions an external protection resistor of
200 Ω is recommended in 12V-systems and 50 Ω in 5V-systems.
interface layer”.
for the offset-DAC (at least 10 periods of the internal clock frequency after releasing
the output).
For details see document: “How to program TLE498x”.
Here again k
code. This means: 1100000 is equal to k
The bit I is the so called Inverting bit, which determines either the output switches
inverse to the applied magnetic field (I=”0”) or not (I=”1”).
i
indicate the 7bits of the k-factor (k
1010k
1011k
1011111111111
6
6
k
k
5
5
k
k
4
4
k
k
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3
3
k
k
2
2
k
k
1
1
0
k
k
=0.75 and 1010010 is equal to k
0
0
I1
I1
6
… MSB and k
0
… LSB) in dual-
0
=0.65.