TLE5012B datasheet(42/50 Pages) INFINEON

42 / 50 page

TLE5012B

Specification

Data Sheet

Rev. 2.0, 2014-02

Figure 4-18 HS hysteresis

4.4.5

Incremental Interface (IIF)

The Incremental Interface (IIF) emulates the operation of an optical quadrature encoder with a 50% duty cycle. It

transmits a square pulse per angle step, where the width of the steps can be configured from 9bit (512 steps per

full rotation) to 12bit (4096 steps per full rotation) within the register MOD_4 (IFAB_RES). The rotation direction is

given either by the phase shift between the two channels IFA and IFB (A/B mode) or by the level of the IFB channel

(Step/Direction mode), as shown in Figure 4-19 and Figure 4-20. The incremental interface can be configured for

A/B mode or Step/Direction mode in register MOD_1 (IIF_MOD).

Using the Incremental Interface requires an up/down counter on the microcontroller, which counts the pulses and

thus keeps track of the absolute position. The counter can be synchronized periodically by using the SSC interface

in parallel. The angle value (AVAL register) read out by the SSC interface can be compared to the stored counter

value. In case of a non-synchronization, the microcontroller adds the difference to the actual counter value to

synchronize the TLE5012B with the microcontroller.

After startup, the IIF transmits a number of pulses which correspond to the actual absolute angle value. Thus, the

microcontroller gets the information about the absolute position. The Index Signal that indicates the zero crossing

is available on the IFC pin.

Sensors with preset IIF are available as TLE5012B E1000.

A/B Mode

The phase shift between phases A and B indicates either a clockwise (A follows B) or a counterclockwise (B

follows A) rotation of the magnet.

Figure 4-19 Incremental interface with A/B mode

Ideal Switching Point

αelect

αHShystel

αelect

0°

90° el . Phase shift

Phase A

Counter

Phase B

Incremental Interface

(A/B Mode)

TLE5012B Datasheet(PDF) 42 Page - Infineon Technologies AG