SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 40 of 128
C1-Public
1.12 GNSS peripheral input output
☞ The GNSS peripheral input output pins are not supported by the SARA-R410M, SARA-R412M,
SARA-R422 and SARA-R422S modules.
SARA-R422M8S modules provides the following 1.8 V peripheral input output pins directly connected
to the internal u-blox M8 GNSS chipset, as illustrated in Figure 3:
• The TXD_GNSS pin consisting in the UART data output of the internal u-blox M8 GNSS chipset.
• The EXTINT external interrupt pin that can be used for control of the GNSS receiver or for aiding.
• The TIMEPULSE output pin that can generate pulse trains synchronized with GPS or UTC time
grid with intervals configurable over a wide frequency range. Thus, it may be used as a low
frequency time synchronization pulse or as a high frequency reference signal.
• The ANT_ON output pin that can provide optional control for switching off power to an external
active GNSS antenna or an external separate LNA. This facility is provided to help minimize power
consumption in power save mode operation.
1.13 Reserved pins (RSVD)
SARA-R4 series modules have pins reserved for future use, marked as RSVD.
All the RSVD pins are to be left unconnected on the application board, except for the RSVD pin number
33 that can be externally connected to ground by 0 series jumper.
☞ It is highly recommended to provide accessible test point directly connected to the RSVD #33 pin
for diagnostic purpose.
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