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

TLE4941-2, TLE4941-2C Supplement
Appendix B Release 1.0
1. Occurrence of initial calibration delay time t_d,input
Identical to TLE4941, TLE4941C appendix B.
2. Magnetic input signal extremely close to a PGA switching threshold during signal
start-up:
After signal start-up normally all PGA switching into the appropriate gain state happens
within less than one signal period. This is included in the calculation for n_DZ-Startup. For the very
rare case that the signal amplitude is extremely close to a switching threshold of the PGA
and the full range of the following speed ADC respectively, a slight change of the signal
amplitude can cause one further PGA switching. It can be caused by non-perfect magnetic
signal (amplitude modulation due to tolerances of polewheel, tooth wheel or air gap
variation). This additional PGA switching can result in a further delay of the output signal (n_DZ-
Startup^{) up to three magnetic edges leading to a worst case of n}DZ-Start^{=9 and n}DR-Startup^=11.
However, the speed signal start-up, comprised of n_DR-Startup and t_d,input is not affected by this
behaviour for TLE4941-2.
TLE4941-2 - TLE4941-2C
8
Datasheet supplement
February 2002