TLE4941-2 Datasheet, PDF (5/8 Pages) Infineon Technologies AG – Differential Two-Wire Hall Effect Sensor IC

TLE4941-2, TLE4941-2C Supplement
Example: ∆B = 10mT sin (ωt + ϕ). ϕ = 30°
Typical startup-behaviour at a sinusoidal input signal of 10mT amplitude, initial phase= 30°.
1
2
3
4
5
6
7
8
9
10
ϕ _{43,6° 133,9° 333,2° 513,2° 693,2° 900° 1080° 1260° 1440° ...}
90,3°
∆ϕ _(PGA,
uncal)
199,3°
(PGA,
uncal)
180°
(uncal)
180°
(uncal)
206,8°
(Offset-
correction)
180°
(cal)
180°
(cal)
180°
(cal)
180°
(cal)
→ This corresponds to row 14 in the table, behaviour similar to Fig. 1
As a special (and rare) case instead of an offset correction after edge number 5, a further
(extra) PGA switching could occur before edge number 5. PGA switching inhibits an
immediate offset update. It can happen if one of the signal peaks is exactly at a PGA
switching threshold (speed-ADC overflow). In this case the offset update (switching from
uncalibrated mode to calibrated mode) would be delayed by two to three further edges. The
referring phase shifts of the example would then be as follows:
1
2
3
4
5
6
7
8
9
10
ϕ _{43,6° 133,9° 333,2° 513,2° 727,5° 907,5° 1087,5° 1260° 1440° ...}
90,3°
∆ϕ _(PGA,
uncal)
199,3°
(PGA,
uncal)
180°
214,3°
180°
(uncal) (extra PGA) ^(uncal)
180°
(uncal)
172,5°
(Offset-
correction)
180°
(cal)
180°
(cal)
→ This corresponds to row 13 of the table.
Circuit Description
See TLE4941 data sheet
TLE4941-2 - TLE4941-2C
5
Datasheet supplement
February 2002