ACS8514T View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
ACS8514T
Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Input Extender
Semtech Corporation
'ACS8514T' PDF : 86 Pages View PDF
ACS8514 SETS Buddy
ADVANCED COMMS & SENSING FINAL
DATASHEET
Address(hex): 49
Register Name cnfg_freq_mon_threshold
Bit 7
Bit 6
Bit 5
Description
Bit 4
(R/W) Register to set both the
hard and soft frequency alarm
limits for the monitors on the
input reference sources.
Bit 3
Bit 2
Default Value 0010 0011
Bit 1
Bit 0
soft_frequency_alarm_threshold
hard_frequency_alarm_threshold
Bit No.
Description
Bit Value Value Description
[7:4]
soft_frequency_alarm_threshold
Threshold to trigger the soft frequency alarms in the
sts_reference_sources registers.
This is only used for monitoring.
-
To calculate the limit in ppm, add one to the 4-
bit value in the register, and multiply by 3.81
ppm. The limit is symmetrical about zero. A value
of 0010 bin corresponds to an alarm limit of
±11.43 ppm.
[3:0]
hard_frequency_alarm_threshold
Threshold to trigger the hard frequency alarms in the
s ts_reference_sources registers, which can cause a
reference source rejection.
To calculate the limit in ppm, add one to the 4-
bit value in the register, and multiply by 3.81
ppm. The limit is symmetrical about zero. A value
of 0011 bin corresponds to an alarm limit of
±15.24 ppm.
Address(hex): 4A
Register Name cnfg_current_freq_mon_
threshold
Bit 7
Bit 6
Bit 5
Description
Bit 4
(R/W) Register to set both the
hard and soft frequency alarm
limits for the monitors on the
currently selected reference
source.
Bit 3
Bit 2
Default Value 0010 0011
Bit 1
Bit 0
current_soft_frequency_alarm_threshold
current_hard_frequency_alarm_threshold
Bit No.
Description
Bit Value Value Description
[7:4]
current_soft_frequency_alarm_threshold
Threshold to trigger the soft frequency alarm in the
sts_reference_sources register applying to the
currently selected source.The currently selected
source can be monitored for frequency using
different limits to all other sources.
[3:0]
current_hard_frequency_alarm_threshold
Threshold to trigger the hard frequency alarm in the
sts_reference_sources register applying to the
currently selected source.
-
To calculate the limit in ppm, add one to the 4-
bit value in the register, and multiply by 3.81
ppm. The limit is symmetrical about zero. A value
of 0010 bin corresponds to an alarm limit of
±11.43 ppm.
To calculate the limit in ppm, add one to the 4-
bit value in the register, and multiply by 3.81
ppm. The limit is symmetrical about zero. A value
of 0011 bin corresponds to an alarm limit of
±15.24 ppm.
Revision 3.00 April 2007 © Semtech Corp.
Page 54
www.semtech.com
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