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Tibbo Project System (TPS)
© Tibbo Technology Inc.
Before establishing a connection, the modem should be initialized. First, pull the -
SDWN line HIGH to power the module. After the STATUS line goes HIGH, the modem
is ready to communicate using AT commands via a standard UART with flow control.
At this point, you can decide whether to allow the system to establish a PPP
connection automatically or to remain in AT command mode (see the Library section
below).
SIM card slot
The card holder of Tibbit #45 accepts a 4G LTE micro-SIM card and features a
“close-and-slide” locking mechanism. The card holder is located on the bottom of
the Tibbit, meaning that insertion or removal of the SIM card requires opening the
enclosure and removing the Tibbit from the
. We chose this relatively inaccessible location for the SIM card to reduce the
chances of theft — accessing the card holder requires quite a bit of time and work,
making it impossible to remove the card surreptitiously.
LEDs
There is one red and one green LED. The red LED is connected to the TX line, while
the green LED is linked to the RX line. The remaining lines are not equipped with
LEDs due to the internal board’s space constraints.
Power considerations
At full LTE bandwidth, Tibbit #45 consumes an average current of 500mA, with peak
current consumption of about 2A. While these current “spikes” are so narrow that
they can’t be seen on a regular multimeter, they occur regularly when the modem is
operating. The modem's power supply was designed with sufficient capacitors to
absorb these spikes, but we recommend using an adequate power source to prevent
unexpected reboots or unstable operation.
The modem consumes approximately 22mA when idle and sips about 1.6mA when in
sleep mode. Note that the idle and sleep modes are not available when the Tibbit is
in the automatic PPP connection mode.
State
Consumption
Average
500mA
Peak
2A
Idle
About 22mA
Sleep
About 1.6mA
The
platform offers several power supply Tibbits
theoretically capable of providing sufficient current. However, only
powered by a 24V or higher voltage source) currently has enough capacity to power
not only the modem, but also the TPP board and other Tibbits you might use in your
project.