IC-LNB_13 Datasheet, PDF (32/35 Pages) IC-Haus GmbH – 18-BIT OPTO ENCODER WITH SPI AND SER/PAR INTERFACES

iC-LNB 18-BIT OPTO ENCODER ^preliminary
WITH SPI AND SER/PAR INTERFACES
ALARM OUTPUT
Rev A1, Page 32/35
iC-LNB has an alarm or error output to indicate exist-
ing 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.
In Table 49 f_b is a basic frequency of typically
12.8 MHz.
OSZC
Code
00
01
10
11
Addr. 0x07; bit 3:2
Description Oscillator frequency (typ.)
1.000 · f_b
1.078 · f_b
1.125 · f_b
1.140 · f_b
12.8 MHz
13.8 MHz
14.4 MHz
14.6 MHz
Table 49: Oscillator adjustment