IC-LNB_16 Datasheet, PDF (33/37 Pages) IC-Haus GmbH – 18-BIT OPTO ENCODER

iC-LNB 18-BIT OPTO ENCODER ^preliminary
WITH SPI AND SER/PAR INTERFACES
ALARM OUTPUT
Rev B2, Page 33/37
iC-LNB has an alarm or error output to indicate existing
errors. If an error occurs, pin ERR is set to 1.
iC-LNB’s LED power control range is monitored. Should
the LED power control exceed its control range, internal
error ERRS (status register, table 6) is set to 1.
If the parity check signals an error in the RAM area,
internal error ERRP (status register, table 6) is set to 1.
ERROR MESSAGE VDD
ERRS
³1
ERRP
ERR
GND
Figure 21: Alarm output
OSCILLATOR
iC-LNB has two internal oscillators for the interpolator
and FlexCount. The frequency of these oscillators can
be finely adjusted using register OSZC; this frequency
limits iC-LNB’s permissible Sin/Cos frequency.
OSZC
Code
00
01
10
11
Addr. 0x07; bit 3:2
Oscillator frequency
interpolator (typ.)
11.5 MHz
12.0 MHz
12.8 MHz
12.8 MHz
Oscillator frequency
FlexCount (typ.)
12.5 MHz
13.0 MHz
13.8 MHz
13.8 MHz
Table 49: Oscillator adjustment