tle4942c Infineon Technologies Corporation, tle4942c Datasheet - Page 12

• Manufacturer Part Number: tle4942c
• Description: Differential Two-wire Hall Effect Sensor Ic
• Manufacturer: Infineon Technologies Corporation

Figure 7
PWM Current Interface
Between each magnetic transition and the rising edge of the corresponding output
pulse the output current is Low for t
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
period T
circuitry reverts to the uncalibrated mode.
TLE4942 - TLE4942C Data Sheet
I
High
I
Low
I
stop
Xn
Xn
duty = t1 / T * 100%
, the stop pulse is output. Typically with the first output stop pulse, the
Definition of duty cycle
EL
, the output pulse lengths are 90µs or 180µs respectively.
Xn+1
pre-low
t
1
in order to allow reliable internal
12
T
EL
, the output pulse lengths are 90µs or
Limit
TLE4942, TLE4942C
, signal is lost.
Xn+2
Warning
EL
t
, the output pulse
, the output pulse
February 2002