ACS8510 Semtech, ACS8510 Datasheet - Page 36

• Manufacturer Part Number: ACS8510
• Manufacturer: Semtech

Specifications of ACS8510

• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6/5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Package Type: LQFP
• Mounting: Surface Mount
• Pin Count: 100
• Lead Free Status / Rohs Status: Not Compliant

Table 12. Register Map Description (continued).
Table 12. Register Map Description (continued).
Selection of Input Reference Clock
Selection of Input Reference Clock
S o u r c e
S o u r c e
Table 12. Register Map Description (continued).
Table 12. Register Map Description (continued).
Table 12. Register Map Description (continued).
Selection of Input Reference Clock
Selection of Input Reference Clock
Selection of Input Reference Clock
S o u r c e
S o u r c e
S o u r c e
Under normal operation, the input reference
sources are selected automatically by an order
of priority. But, for special circumstances, such
as chip or board testing, the selection may be
forced by configuration.
Automatic operation selects a reference source
based on its pre-defined priority and its current
availability. A table is maintained which lists all
reference sources in the order of priority. This
is initially downloaded into the ACS8510 via
the microprocessor interface by the Network
Manager, and is subsequently modified by the
results of the ongoing quality monitoring. In this
way, when all the defined sources are active
and valid, the source with the highest
programmed priority is selected but, if this
source fails, the next-highest source is selected,
and so on.
Restoration of repaired reference sources is
handled carefully to avoid inadvertent
disturbance of the output clock. The ACS8510
has two modes of operation; Revertive and
Revision 2.00/September 2003
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Non-Revertive. In Revertive mode, if a re-
validated (or newly validated) source has a
higher priority than the reference source which
is currently selected, a switch over will take
place. Many applications prefer to minimise the
clock switching events and choose Non-
Revertive mode. In Non-Revertive mode , when
a re-validated (or newly validated) source has a
higher priority then the selected source will be
maintained. The re-validation of the reference
source will be flagged in the sts_sources_valid
register and, if not masked, will generate an
interrupt. Selection of the re-validated source
can only take place under software control -
the software should briefly enable Revertive
mode to affect a switch-over to the higher
priority source. If the selected source fails under
these conditions the device will indicate that it
is still locked to the failed reference. It will not
select the higher priority source until instructed
to do so by the software; by briefly setting the
Revertive mode bit. When there is a reference
available with higher priority than the selected
reference, there will be NO change of reference
source as long as the Non-Revertive mode
remains on AND the device will remain indicating
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