SAM-M10Q - Integration manual
Figure 15: Time pulse and TIM-TP
2.9.2 Time pulse configuration
The time pulse (TIMEPULSE) signal has configurable pulse period, length and polarity (rising or
falling edge).
It is possible to define different signal behavior (i.e. output frequency and pulse length) depending
on whether or not the receiver is locked to reliable time source.
The configuration group CFG-TP-* can be used to change the time pulse settings, and includes the
following parameters defining the pulse:
•
time pulse enable
- If this item is set, the time pulse is active.
•
frequency/period type
- Determines whether the time pulse is interpreted as frequency or
period.
•
length/ratio type
- Determines whether the time pulse length is interpreted as length [us] or
pulse ratio [%].
•
antenna cable delay
- Signal delay due to the cable between the antenna and the receiver.
•
pulse frequency/period
- Frequency or pulse time period when locked mode is not configured or
not active.
•
pulse frequency/period lock
- Frequency or pulse time period for locked mode. In use as soon as
the receiver has calculated a valid time from a received signal. Only used if the corresponding
item is set to use another setting in locked mode.
•
pulse length/ratio
- Length or duty cycle of the generated pulse, specifies either time or ratio
for the pulse to be on/off.
•
pulse length/ratio lock
- Length or duty cycle of the generated pulse for locked mode. In use
as soon as the receiver has calculated a valid time from a received signal. Only used if the
corresponding item is set to use another setting in locked mode.
•
user delay
- The cable delay from the receiver to the user device plus signal delay of any user
application.
•
lock to GNSS freq
- If this item is set, uses the frequency gained from the GNSS signal
information rather than the local oscillator's frequency.
•
locked other setting
- If this item is set, the alternative setting will be used as soon as the
receiver can calculate a valid time. This mode can be used, for example, to disable time pulse if
the time is not locked, or to indicate a lock with different duty cycles.
•
align to TOW
- If this item is set, pulses are aligned to the top of a second.
•
polarity
- If set, the first edge of the pulse is a rising edge (pulse polarity: rising).
•
grid UTC/GNSS
- Selection between UTC (0), GPS (1), GLONASS (2), BeiDou (3) and (4) Galileo
time grid. Also affects the time output by UBX-TIM-TP message.
The maximum pulse length cannot exceed the pulse period.
UBX-22020019 - R01
2 Receiver functionality
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