1Pps - Sierra Wireless AirPrime XS1110 Product Technical Specification

Product Technical Specification
Rev 4.0 Jul.20

1PPS

1PPS signal is an output pulse signal used for timing applications. Its electrical
characteristics are:
Voltage level: 1.8 V (typical)
•
Period: 1 s
•
Accuracy (jitter): +-25 ns
•
125 ms pulse width duration
•
Figure 5-4: 1PPS Signal
For signal level shift, when the host system is 3.3 V and the GNSS module is 1.8
V, the host system can control the GNSS module by using a signal level shift
circuit (refer to Figure 5-5
these values can be adjusted to achieve control in the actual design. The
2N7002L can select low RDS (On) to reduce power consumption through a
voltage drop.
+3.3 V
TX
+3.3 V
3.3V
Host System
RX
Figure 5-5: Signal Level Shift Circuit
40
below). The values of R1 to R6 are default values;
R1
10K
2
3
D S
2N7002L
R4
10K
2
3
D S
2N7002L
+1.8 V
R2 R3
10K 10K
TX
+1.8 V
1.8V
R5 R6
Module
10K 10K
RX
41113354