ACS8510 Semtech, ACS8510 Datasheet - Page 38

• 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

External Protection Switching
External Protection Switching
The flagging of the loss of the main reference
failure on TDO is simply allowing the status of
the sts_interrupt bit 14 to be reflected in the
state of the TDO output pin.
therefore remain High until the interrupt is
cleared. This functionality is not enabled by
default so the usual JTAG functions can be
used. When JTAG is normally used straight out
of power-up, then this feature will have no
bearing on the functionality. The TDO flagging
feature will need to be disabled if JTAG is not
enabled on power-up and the feature has since
been enabled.
When the TDO output from the ACS8510 is
connected to the TDI pin of the next device in
the JTAG scan chain, the implementation should
be such that a logic change caused by the
action of the interrupt on the TDI input should
not effect the operation when JTAG is not
active.
External Protection Switching
External Protection Switching
External Protection Switching
Fast external switching between inputs <I_3>
and <I_4> can also be triggered directly from a
dedicated pin (SRCSW).
activated either by holding this pin high during
reset, or by writing to bit 4 of register address
48Hex. Once external protection switching is
Revision 2.00/September 2003
Figure 9. Inactivity and Irregularity Monitoring
Figure 9. Inactivity and Irregularity Monitoring
Figure 9. Inactivity and Irregularity Monitoring
Figure 9. Inactivity and Irregularity Monitoring
Figure 9. Inactivity and Irregularity Monitoring
ADVANCED COMMUNICATIONS
leaky bucket
response
reference
source
alarm
Semtech Corp.
This mode can be
The pin will,
inactivities/irregularities
38
enabled, then the value of this pin directly
selects either <I_3> (SRCSW high) or <I_4>
(SRCSW low). If this mode is activated at reset
by pulling the SRCSW pin high, then it configures
the default frequency tolerance of <I_3> and
<I_4> to +/- 80 ppm (register address 41Hex
and 42Hex).
subsequently set by external software if
required.
When external protection switching is enabled,
the device will operate as a simple switch. All
clock monitoring is disabled and the DPLL will
simply be forced to try to lock on to the
indicated reference source.
Clock Quality Monitoring
Clock Quality Monitoring
Clock Quality Monitoring
Clock Quality Monitoring
Clock Quality Monitoring
Clock quality is monitored and used to modify
the priority tables of the local and remote
ACS8510 devices. The following parameters are
monitored:
1. Activity (toggling)
2. Frequency (This monitoring is only performed when
there is no irregular operation of the clock or loss of clock
condition)
In addition, input ports <I_1> and <I_2> carry
AMI-encoded composite clocks which are
programmable fall slopes
ACS8510 Rev2.1 SETS
Any of these registers can be
(all programmable)
upper_threshold
lower_threshold
bucket_size
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FINAL