STC5420 Datasheet, PDF (39/70 Pages) Connor-Winfield Corporation – Synchronous Clock for SETS

Default value: 100 (range = 10.0 ppm).
Qualification_Soaking_Time, 0x12 (R/W)
STC5420
Synchronous Clock for SETS
Data sheet
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0x12
Not used
0 ~ 63 s
Sets the soaking time for reference qualification, from 0 to 63s, in 1s step.
Default value: 10 (10s)
Ref_Index_Selector, 0x13 (R/W)
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0x13
Not used
REF1~REF12
Select a reference input to access the register Ref_Info and Ref_Acceptable_Freq.
Valid values from 1 to 12 are relative to Ref1 to Ref12. Invalid values will not be written to the register.
Default value: 1
Ref_Info, 0x14 (R)
Address
Bit7
0x14
0x15
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Lower 8 bits of frequency offset
Reference frequency
Upper 4 bits of frequency offset
Frequency offset (Bit11~Bit0):
- Indicates the frequency offset the reference input selected by the register Ref_Index_Selector. Frequency offset is from
-204.7 to +204.7 ppm relative to calibrated freerun clock, in 0.1 ppm steps, 2’s complement. A value of -2048 indicates
the reference is out of range.
Reference frequency (Bit15~Bit12):
- Indicates frequency of the auto-detect reference input selected by the register Ref_Index_Selector. When field value of
is 15, means manually acceptable reference input frequency is being used. Refer to the register Ref_Acceptable_Freq
for the manually acceptable frequency setting.
The reference frequency is determined as follows (“Unknown” indicates a signal is present, but frequency is
undetermined):
Field Value
0
1
2
3
4
Frequency
No signal
8 kHz
64 kHz
1.544 MHz
2.048 MHz
Page 39 of 70
Rev:2.0
© Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Date: September 28, 2011