N58 Hardware User Guide
Chapter 5 Application Interfaces
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5.6.9 1PPS
Pin Name
Pin No.
I/O
Function
Remarks
1PPS
89
DO
GNSS timing output
The precision is less than 30 ns.
Only the sub-models of the N58 module
with GNSS have this function.
The 1PPS interface is mainly used for GNSS timing, and the timing precision is less than 30 ns. The
output signal is a pulse signal with an amplitude of 3 V and a duty cycle of 10%. Figure 5-37 shows the
1PPS output waveform.
Figure 5-37 1PPS output waveform
T=1s
100ms
For sub-models of the N58 module without GNSS, the 1PPS pin can be used as the ADC pin. The detectable
voltage ranges from 0.1 V to VBAT, and 12-bit precision resolution is supported.
5.6.10 VCC_GNSS_BIAS
Pin Name
Pin No.
I/O
Function
Remarks
VCC_GNSS_BIAS 145
PO/DO
GNSS
active
antenna
power supply and detection
Only the sub-models of the
N58 module with GNSS
have this function.
The N58 module integrates an active antenna detection circuit, feeds the external active antenna, and
indicates the status of the active antenna based on the feed current value.
Three states are defined for the detection circuit.
Open-circuit: If the current is less than 2.5 mA, the N58 module indicates that the antenna is in
the open-circuit state.
Normal: If the current is greater than or equal to 2.5 mA or less than 45 mA, the N58 module
indicates that the antenna is in the normal state.
