ACS8514 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
ACS8514
Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Input Extender
Semtech Corporation
'ACS8514' PDF : 86 Pages View PDF
ACS8514 SETS Buddy
ADVANCED COMMS & SENSING FINAL
DATASHEET
Address(hex): 3F
Register Name
Bit 7
Cnfg_average_frequency
[15:8]
Bit 6
Bit 5
Description
Bit 4
(R/W) Bits [15:8] of the average
frequency register.
Bit 3
Bit 2
Default Value
Bit 1
0000 0000
Bit 0
average_frequency_value[15:8]
Bit No.
Description
Bit Value Value Description
[7:0]
average_frequency[15:8]
This value in this register is combined with the value
in register 3E and Bits [2:0] of register 40 to
represent the average frequency of the Monitor
DPLL. Also see register 40h bit 6.
Register 40 , bit 5 must be set high.
-
In order to calculate average frequency of the
monitor DPLL with respect to the crystal
oscillator frequency, the value in this register
and register 3Eh and Bits [2:0] of register 40h
need to be concatenated. This value is a 2's
complement signed integer. The value multiplied
by 0.0003068 dec will give the value in ppm.
Address(hex): 40
Register Name cnfg_averager_modes
Description
Bit 7
Bit 6
Bit 5
Bit 4
freq_averaging fast_averaging Set to 1
Set to 0
Bit No.
Description
7
freq_averaging
Bit to enable the frequency averager.
(R/W) Register to control the
average modes of the monitor
DPLL.
Bit 3
Bit 2
Default Value 1000 1000
Bit 1
Bit 0
Set to 1
average_frequency_value [18:16]
Bit Value Value Description
0
Additional averaging not done.
1
Additional averaging carried out and reported.
6
fast_averaging
0
Slow Holdover frequency averaging enabled.
Bit to control the rate of averaging of the frequency.
1
Fast Holdover frequency averaging enabled.
Fast averaging gives a -3db response point of
approximately 8 minutes. Slow averaging give a -3db
response point of approximately 110 minutes.
5
Set to 1
To allow the averaged frequency to be read out.
1
-
4
Set to 0
0
-
3
Set to 1
1
-
[2:0]
averager_frequency_value [18:16]
-
See register 3F ( cnfg_average_frequency) for
details.
Revision 3.00 April 2007 © Semtech Corp.
Page 49
www.semtech.com
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