Data Sheet Supplement, V2.1, February 2005
Differential Two-Wire Hall Effect
Sensor-IC for Wheel Speed Applications
TLE4941-1
TLE4941-1C
Sensors
Never stop thinking.
Edition 2004-03-19
Published by Infineon Technologies AG,
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81669 München, Germany
© Infineon Technologies AG 2005.
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PG-SSO-2-1
PG-SSO-2-2
Data Sheet Supplement 3 V2.1, 2005-02
Differential Two-Wire Hall Effect Sensor IC TLE4941-1
TLE4941-1C
For all parameters not specified in this document
the TLE4941 Data Sheet is valid.
Type Marking Ordering Code Package
TLE4941-1 4101R Q62705-K719 PG-SSO-2-1
TLE4941-1C 41C1R Q62705-K712 PG-SSO-2-2
TLE4941-1
TLE4941-1C
Data Sheet Supplement 4 V2.1, 2005-02
Functional Description
Figure 1 Example for Start-up Behavior
Uncalibrated Mode
Occasionally a short initial offset settling time td,input might delay the detection of the input
signal (the sensor is “blind”).
The magnetic input signal is tracked by the speed ADC and monitored within the digital
circuit. For detection the signal transient needs to exceed a threshold (digital noise
constant d1). When the signal slope is identified as a rising edge (or falling edge), a
trigger pulse is issued to a comparator. A second trigger pulse is issued as soon as a
falling edge (or rising edge respectively) is detected (and vice versa).
Between the start-up of the magnetic input signal and the time when its second extreme
is reached, the PGA (programmable gain amplifier) will switch to its appropriate position.
This value is determined by the signal amplitude and initial offset value. The digital noise
constant value is changing accordingly (d1 → d2, related to the corresponding PGA
states), leading to a change in phase shift between magnetic input signal and output
AED03204
Uncalibrated Mode Calibrated Mode
12 3 4 5 6 7
Initial
Setting
Time
d1 d1
PGA
Switching
d2
d2
d2
Offset
Corection
Phase Shift
Change
= Peak Detection
Offset = (max + min) / 2
TLE4941-1
TLE4941-1C
Data Sheet Supplement 5 V2.1, 2005-02
signal. After that consecutive output edges should have a nominal delay of about 180°.
In rare cases one further switching of PGA can occur (see Appendix B).
During the uncalibrated mode the offset value is calculated by the peak detection
algorithm as described in the TLE4941 Data Sheet.
Transition to Calibrated Mode
In the calibrated mode the output will switch at zero-crossing of the input signal. The
phase shift between input and output signal is no longer determined by the ratio between
digital noise constant and signal amplitude. Therefore a sudden change in the phase
shift may occur during the transition from uncalibrated to calibrated mode.
Calibrated Mode
See TLE4941 Data Sheet.
Additional Notes
Unlike the TLE4941 the first output edge might occur before the first zero-crossing of the
magnetic input signal. However, referring to the input signal the delay between start-up
of the signal and first calibrated output signal is identical with TLE4941.
Typically the phase error due to PGA-transition reduces the error caused by switching
the mode from uncalibrated to calibrated. PGA-transition usually takes place on the first
full magnetic edge.
The summed up change in phase error from the first output edge issued to the output
edges in calibrated mode will not exceed ± 90°.
Circuit Description
See TLE4941 Data Sheet.
TLE4941-1
TLE4941-1C
Data Sheet Supplement 6 V2.1, 2005-02
Table 1 Additions/Changes for TLE4941-1 versus TLE4941
(All values are valid for constant amplitude and offset of input signal,
f < 2500 Hz)
Parameter Symbol Limit Values Unit Conditions
min. typ. max.
Signal behavior after
undervoltage or
standstill > tStop
Number of magnetic
edges where the first
switching may occur 1)
nDZ-Start ––1edge Magnetic edge
amplitude
according to
∆ˆ
BLimit,early startup
t
d,input
has to be
taken into account
Systematic phase error of
output edges during
start-up and
uncalibrated mode
38 ––µs Shortest time
delay between
input signal edge
1 and 2 td,input has
to be taken into
account
– 88 –+ 88 °
Systematical phase
error of “uncal”
edge; n
th
vs. n + 1
th
edge (does not
include random
phase error)
Phase shift change
during PGA switching
0–80 °after the 2nd edge
Phase shift change
during transition from
uncalibrated to
calibrated mode
∆Φswitch – 90 –+ 90 °
Number of edges in
uncalibrated mode
nDZ-Startup ––6edges
In rare cases
(see “Appendix B” on
page 6)
nDZ-Startup ––8edges
Jitter during
uncalibrated mode
1 Hz < f < 2500 Hz
SJitClose
(1
σ
-value)
–
–
–
–
± 3
± 4
% – 40°C ≤ Tamb
≤ 150°C
150°C ≤ Tamb
≤ 170°C
TLE4941-1
TLE4941-1C
Data Sheet Supplement 7 V2.1, 2005-02
Behavior at Magnetic Input Signals Slower than Tstop (self-calibration time period)
Unlike the TLE4941 magnetic changes exceeding ∆ˆ
BLimit, early startup can cause output
switching of the TLE4941-1, even at f significantly lower than 1 Hz. Depending on their
amplitude edges slower than ∆tLimit, slow early startup might be detected. If the digital noise
constant (∆ˆ
BLimit, early startup) is not exceeded before a new initial self-calibration is started,
the output of the corresponding edge will be inhibited. This depends on signal amplitude
and initial phase.
Additional Remarks
All additional parameters for TLE4941-1 are not subject to production test - verified by
design/characterization. For series production additional to the parameters of TLE4941
(standard type) only nDZ-start is tested.
SJitFar
(1
σ
-value)
–
–
–
–
± 5
± 7
% – 40°C ≤ Tamb
≤ 150°C
150°C ≤ Tamb
≤ 170°C
SJitAC
(1
σ
-value)
––± 3 %See TLE4941
Data Sheet
Magnetic differential field
change necessary for
early startup of the - 1
Versions
∆ˆ
B
Limit,
early startup
––– Magnetic field
(peak to peak
value) change
necessary for
startup with the
first edge
∆ˆ
BLimit, early startup
1 Hz < f < 2500 Hz
2500 Hz < f < 10000 Hz
0.7
–
1.76
–
3.3
3.9
mT
Permitted time for edges
to exceed ∆ˆ
BLimit, early startup
∆tLimit, slow
early startup
––590 ms Necessary for
startup with the
second edge
f < 1 s
1) Due to defined power on state (low current) the IC can not provide the first edge if it would lead as well to a
low state
Table 1 Additions/Changes for TLE4941-1 versus TLE4941
(All values are valid for constant amplitude and offset of input signal,
f < 2500 Hz) (cont’d)
Parameter Symbol Limit Values Unit Conditions
min. typ. max.
TLE4941-1
TLE4941-1C
Data Sheet Supplement 8 V2.1, 2005-02
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Revision History:2005-02, V2.1
Previous Version: 2004-01, V2.0
Page Subjects (major changes since last revision)
3Package name changed from P-... to PG-...
-new format of data sheet
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TLE4941-1
TLE4941-1C
Data Sheet Supplement 9 V2.1, 2005-02
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