TLE4942-2C

Data Sheet Supplement Differential Two-Wire Hall Effect Sensor IC TLE4942-2 TLE4942-2C For all parameters not specified in this document the TLE4942 data sheet is valid. P-SSO-2-1 Type TLE4942-2 TLE4942-2C Marking 4202E4 42C2E4 Ordering Code Q62705-K633 Q62705-K630 Package PSSO2-1 PSSO2-2 TLE4942-2, TLE4942-2C Supplement 1 Functional description initial settling time peak detection d2 d2 offset= (m ax + min) / 2 offset correction d1 d1 d2 0 1 2 3 4 5 6 7 standstill pulse (cut off) PGA switching uncalibrated mode calibrated mode Fig. 1: example for start-up behaviour 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 comparator is triggered. The comparator is triggered again as soon as a falling edge (or rising edge respectively) is detected (and vice versa). Depending on the initial state of the comparator the IC output is first triggerd on the first or second detected edge. Between the startup 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 a...