System Pin - Quectel L76 Hardware Design

GNSS Module Series
UTC 12:00:00 UTC 12:00:01
1PPS
465 ms~485 ms
UART
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Figure 15: 1PPS & NMEA Timing
The feature only supports 1 Hz NMEA output at baud rate 19200-115200 bps. Because at lower baud
rates, the time needed for transmission may exceed 1 second if there are many NMEA sentences. For
more information about the commands to enable/disable this function, see document [1].

4.1.4. System Pin

4.1.4.1. RESET_N
RESET_N is an input pin. The modules can be reset by driving RESET_N low for at least 100 ms and
then releasing it.
The pin is pulled up internally by default. As the power domain of RESET_N is 2.8 V/1.8 V and the pin has
been pulled up inside the modules, no external pull-up circuit is allowed for this pin.
An OC driver circuit as shown below is recommended to control the RESET_N pin.
RESET_N
4.7K
Input pulse
47K
Figure 16: Reference OC Circuit for Module Reset
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