iC-LNB 18-BIT OPTO ENCODER
WITH SPI AND SER/PAR INTERFACES
Rev A1, Page 32/35
ALARM OUTPUT
iC-LNB has an alarm or error output to indicate exist-
ing errors. If an error occurs, pin ERR is set to 1.
ER RO R ME SSA GE
VD D
ER R
G ND
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.
ER RS
ER RP
³1
If the parity check signals an error in the RAM area,
internal error ERRP (status register, table 6) is set to 1.
Figure 21: Alarm output
OSCILLATOR
OSZC
Code
Addr. 0x07; bit 3:2
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.
Description
1.000 · fb
1.078 · fb
1.125 · fb
1.140 · fb
Oscillator frequency (typ.)
00
01
10
11
12.8 MHz
13.8 MHz
14.4 MHz
14.6 MHz
In Table 49 fb is a basic frequency of typically
12.8 MHz.
Table 49: Oscillator adjustment
ICHAUS [ IC-HAUS GMBH ]
