General Rules for Design
Rev 3.0 Aug.19
15
41111116
Figure 2-11: 1PPS signal and its pulse width with 100ms duration
Free run 1PPS Output Before 3D_FIX
The Sierra Wireless standard GNSS module outputs 1PPS signal after the
module obtains a 3D_FIX. This is a factory default setting.
Cable Delay Compensation
In some cases, a long-distance connection (~300m) may be needed. For a timing
application, the cable length is critical. For more information on 1PPS signal
transmission delay please refer to
How to Efficiently Transfer 1PPS Through
LED Indicator for 1PPS Signal
For 1PPS LED indication, you may connect an LED indicator with a 330ohm
resistor in series.
Figure 2-12: 1PPS Signal Design for IO