TLE4942, TLE4942C

TLE4942 - TLE4942C Data Sheet

February 2002

12

T

I

t

t

1

Xn

Xn

Xn+1

Xn+2

duty = t1 / T * 100%

Figure 7

Definition of duty cycle

PWM Current Interface

Between each magnetic transition and the rising edge of the corresponding output

conveyance. Following the signal pulse (current is High) is output.

If the magnetic differential field exceeds

∆B

180µs respectively, depending on the direction of rotation.

When the magnitude of the magnetic differential field is below

∆B

lengths are 360µs and 720µs respectively, depending on left or right rotation. Due to

decreasing cycle times at higher frequencies, these longer pulses are only output up

to frequencies of approximately 117Hz. For higher frequencies and differential

magnetic fields below

∆B

If the magnitude of the magnetic differential field is below

∆B

length is 45µs. The warning output is dominant, this means that close to the limit

airgap the direction and the assembly position information are disabled.

For magnitudes of the magnetic differential field below

∆B

In case no magnetic differential signal is detected for a time longer than the stand still

circuitry reverts to the uncalibrated mode.