tle4982c Infineon Technologies Corporation, tle4982c Datasheet - Page 10

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

clock (less than 20µs delay). Any disturbance in this sequence will terminate the
initialisation procedure. After having successfully finished the initialisation the chip
enters the testmode and data transmission can be started.
Data transmission: Serial transmission is done in words (LSB first). A logical „1“ is
represented by a long (2/3 of one period) „high“ voltage level (higher than 5V) on the
supply followed by a short (1/3 of one period) „low“ voltage level (lower than 5V),
whereas a logical „0“ is represented by a short „high“ level on the supply followed by a
long „low“ level. At the same time this high/low voltage combination, which forms in fact
a bit, acts as a serial interface clock which clocks out logical high / low values on the
output. We recommend a period length of around 100µs per bit. See fig.5 for a more
detailed timing diagram. End of word is indicated by a long (we recommend longer than
200µs, first 30µs should be higher than 5V and the rest lower than 5V) „low” supply.
Please note, that for communicating 13 bits of data 14 VS-pulses are necessary. If more
than 14 input bits are transmitted the output bits are irrelevant (transmission buffer
empty) whereas the input bits remain valid and start overwriting the previously
transmitted bits. In any case the last 14 transmitted bits are interpreted as transmitted
data word (13 bits) + 1 stop bit. End of communication is signalled by a long „high“
voltage level. A new communication has to be set up by a new initialisation sequence.
Programming the PROM:
One possibility for programming the static threshold value is to run the IC on a testbench
(or in the car), to wait until the IC has reached the calibrated mode and then simply to
issue the copy commands, which transfers the calibrated threshold value into the
PROM.
Use the following procedure for this type of programming:
1) Apply an oscillating magnetic field with a suitable offset (Notice that for unfused
2) Enter the testmode with the second procedure described in the chapter “Physical
3) Wait until the IC has reached the calibration mode.
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.
devices this offset lies in the middle of the maximum and minimum value of the
magnetic field).
interface layer”.
For details see document: “How to program TLE498x”.
Here k
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
0
k
k
=0.75 and 1010010 is equal to k
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3
3
k
k
2
2
k
k
1
1
k
k
6
0
0
I1
I1
… MSB and k
0
… LSB) in dual-code.
0
=0.65.