Microchip LN-CSAC-SA65 handleiding
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LN-CSAC Model SA65-LN User’s Guide
DS50003805A-page 34 2024 Microchip Technology Inc. and its subsidiaries
3.3.4 1 PPS Synchronization (S)
To synchronize the 1 PPS output (pin 10) to an externally applied synchronization input
(PPSEXT, pin 9), connect an external 1 PPS signal to pin 9 and send the !S command.
The rising edge of PPSOUT will synchronize to within ±100 ns of the next rising edge
of the applied PPSEXT. If a valid 1 PPS input does not appear at the PPSEXT within 3
seconds, the operation is aborted, and an error is returned.
Example: Synchronize 1 PPS: Command: !S[CRLF]
Unit response: S[CRLF]
or: E[CRLF]
The unit response (S or E) occurs after either successful synchronization or 3-second
timeout, respectively.
3.3.5 Set 1 PPS Disciplining Time Constant (D)
The time constant for disciplining to an externally supplied 1 PPS reference source
may be selected to provide optimal performance in each application (see
Section 5.1 “The Art of Disciplining”).
The time constant can range from 60 to 10000 seconds. The 1 PPS disciplining time
constant is set with the !D command. The format for setting the time constant is
!DX[CRLF] where X is the new time constant in seconds.
Example: Set disciplining time constant to 100 seconds:
Command: !D100[CRLF]
Response: 100[CRLF]
To query the current time constant setting, without modifying the value, use the
command !D?
Example: Query current disciplining time constant:
Command: !D?[CRLF]
Response: 100[CRLF]
3.3.6 Set Volatile 1 PPS Disciplining Time Constant (d)
A volatile disciplining time constant may be set using the !d command. This time con-
stant will be applied but will not persist across power cycling. This command is useful
for quickly disciplining the LN-CSAC during initial calibration while keeping a longer
time constant in NVRAM in the event of a power cycle. The format for this command is
!dX[CLRF] where X is the volatile time constant in seconds.
Example: Set a temporary time constant to 100 seconds:
Command: !d100[CRLF]
Response: 100[CRLF]
3.3.7 Set 1 PPS Disciplining Cable Length Compensation (DC)
Cable length compensation can be applied to allow for known delay (or advance) in the
arrival time of the reference 1 PPS at the LN-CSAC (see Section 2.10.1 “Cable
Length Compensation”). Cable length compensation is represented as a signed inte-
ger in units of 100 ps, with a maximum value of ±250 (25 ns).
The sign of the compensation is such that a positive value reflects known delay in the
arrival time of the 1 PPS. For instance, 2 meters of RG-58 cable requires compensation
of approximately +10 ns.
Note: The single-character S is a shortcut for !S[CRLF].
Note: The single-character D is a shortcut for !D?[CRLF].
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Productinformatie
| Merk | Microchip |
| Model | LN-CSAC-SA65 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6392 MB |
