ACS8514 Semtech Corporation, ACS8514 Datasheet - Page 54

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ACS8514

Manufacturer Part Number
ACS8514
Description
Synchronous Equipment Timing Source Partner IC for 2nd T4 Dpll, Accurate Monitoring & Input Extender
Manufacturer
Semtech Corporation
Datasheet
Revision 3.00 April 2007 © Semtech Corp.
Address(hex): 49
Address(hex): 4A
Register Name
Register Name
ADVANCED COMMS & SENSING
Bit No.
Bit No.
Bit 7
[7:4]
[3:0]
Bit 7
[7:4]
[3:0]
current_soft_frequency_alarm_threshold
cnfg_freq_mon_threshold
Description
soft_frequency_alarm_threshold
Threshold to trigger the soft frequency alarms in the
sts_reference_sources registers.
This is only used for monitoring.
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.
cnfg_current_freq_mon_
threshold
Description
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.
current_hard_frequency_alarm_threshold
Threshold to trigger the hard frequency alarm in the
sts_reference_sources register applying to the
currently selected source.
soft_frequency_alarm_threshold
Bit 6
Bit 6
Bit 5
Bit 5
Description
Description
Bit 4
Bit 4
Page 54
FINAL
(R/W) Register to set both the
hard and soft frequency alarm
limits for the monitors on the
input reference sources.
(R/W) Register to set both the
hard and soft frequency alarm
limits for the monitors on the
currently selected reference
source.
Bit Value
Bit Value
Bit 3
Bit 3
-
-
current_hard_frequency_alarm_threshold
hard_frequency_alarm_threshold
Value Description
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.
Value Description
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.
ACS8514 SETS Buddy
Bit 2
Bit 2
Default Value
Default Value
Bit 1
Bit 1
DATASHEET
www.semtech.com
0010 0011
0010 0011
Bit 0
Bit 0

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