⚫ The PIN44 VRTC pin is input by an external battery to maintain the voltage
value after the module is powered down If it is necessary to use VRTC to
maintain the reference clock in the module power-off state, it is not possible to
use the PWRKEY automatic power-on design, otherwise it will lead to the
failure of secondary power-on after shutdown. In addition, if the VRTC pin is
used, the module must go through the normal shutdown process, and the
module VBAT cannot be powered down directly, otherwise the clock will not be
saved.
⚫ PIN104/105 GRFC_6/7: RF tuning antenna control interface. If it is necessary
to use it, please confirm with Fibocom.
⚫ All RESET VALUEs in the table refer to the corresponding state of the pin of
the module at RESET instant (during the duration of RESET low level) (at this
time, the pin corresponds to the Function 0 in the GPIO multiplexing table), PU
represents high level, and PD represents low level. For detailed GPIO state,
please refer to the GPIO multiplexing table. Especially when enabling electro-
acoustic devices, or controlling motors, relays and other devices, please refer
to the GPIO multiplexing table to select the appropriate GPIO.
To Next Page
