I/O pins
UM2231
12/26
UM2231 Rev 6
4 I/O
pins
4.1 PPS
(pin4)
PPS is the time pulse every one second. It can be configured with different condition of
pulses.
During prototyping stage, for the first PCBs, it is recommended to plan to have some filtering
components on Teseo-LIV3 PPS pin as shown in
Figure 8
.
Figure 8. PPS pin filtering
4.2 Wake_Up
(pin5)
It is an external interrupt that is used to wake-up Teseo-LIV3 for asynchronous wake-up
during standby software for instance.
It can be activated by a GPIO from host for instance. Wake_Up signal is active high.
4.3 SYS_RESETn
(pin9)
It can force a Teseo-LIV3 under reset.
Reset signal is active low.
Host processor must have full control of this pin to guarantee the Teseo-LIV3F’s firmware
upgrade support. It is mandatory only on Teseo-LIV3F.
4.4 RF_IN
(pin10)
It is the RF input.
4.5 AntOFF
(pin13)
AntOFF is a GPIO used to switch OFF external LNA or switch OFF current for the active
antenna.
A 10 k
Ω
pull down is necessary to ensure a low level during standby period.
