IC-MN datasheet(32/62 Pages) ICHAUS

32 / 62 page

iC-MN 25-BIT NONIUS ENCODER

WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

Rev F2, Page 32/62

UBL_N/ SBL_N/ Permissible Max. Phase Deviation

UBL_S

SBL_S

[given in degree per signal period of 360°]

+/- 22.5°

+/- 33.75°

+/- 39.38°

+/- 11.25°

+/- 16.88°

+/- 19.69°

+/- 5.63°

+/- 8.44°

+/- 9.84°

+/- 2.81°

+/- 4.22°

+/- 4.92°

+/- 1.41°

+/- 2.11°

+/- 2.46°

Table 45: Tolerable phase deviation for the master ver-

sus the nonius or segment track (with refer-

ence to 360°, electrical)

The synchronization principle is summarized in Figure

11, where φ represents the digitized angle of the rele-

vant track.

Figure 11: Principle of nonius mode synchronization

Digital Frequency Monitoring

iC-MN features an integrated frequency monitoring cir-

cuit for the master track. A signal frequency warning

threshold can be configured by FRQ_TH.

FRQ_TH

Addr. 0x43; bit 7:6

Code

Warning Threshold

7.625 kHz

31.25 kHz

62.5 kHz

125 kHz

Table 46: Signal frequency monitoring

FRQ_TH is used by the frequency-dependent period

verification feature available for nonius modes (see

MODE_ST = 0x01, 0x03, 0x06 and 0x09).

The following applies to all modes with nonius synchro-

nization: if the frequency of the master track is too high

at power on, FRQ_STUP and FRQ_WDR remain set

until the period verification was successful below the

frequency warning threshold. In nonius modes without

an enabled period verification it must be observed that

FRQ_STUP remains permanently set and can only be

reset by SOFT_RES when the warning threshold is

undershot.

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