AX-SIGFOX Datasheet, PDF (8/30 Pages) ON Semiconductor – Ultra-Low Power Microcontroller

8 Pin Function Descriptions
Symbol
Pin(s)
Type Description
GPIO3
VDD_IO
NC
NC
CLKN
CLKP
GND
35
36
37
38
39
40
Center pad
I/O/A/PU
P
N
N
A
A
P
General purpose IO, selectable ADC functionality
Unregulated power supply
Connect to Ground
Connect to Ground
TCXO interface
TCXO interface
Ground on center pad of QFN, must be connected
A = analog signal
I = digital input signal
O = digital output signal
PU = pull-up
I/O = digital input/output signal
N = not to be connected
P = power or ground
PD = pull-down
All digital inputs are Schmitt trigger inputs, digital input and output levels are LVCMOS/LVTTL
compatible. Pins GPIO[3:0] must not be driven above VDD_IO, all other digital inputs are 5V
tolerant. All GPIO pins and UARTRX start up as input with pull-up.
Pin
Possible GPIO modes
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO0
GPIO1
GPIO2
GPIO3
0,1,Z,U,A,T
0,1,Z,U,A
0,1,Z,U,A
0,1,Z,U,A
0,1,Z,U,T
0,1,Z,U
0,1,Z,U
0,1,Z,U
0,1,Z,U
0,1,Z,U
0
= pin drives
1
= not to be connected
Z
= pin is high impedance input
U
= pin is input with pull-up
A
= pin is analog input
T
= pin is driven by clock or DAC
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