AX−SIGFOX
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14
Table 10. COMMANDS
Command DescriptionName
AT:ADC Pn[−Pn[(1V|10V)]]? Get GPIO Pin Analog Voltage Measure the voltage applied to a GPIO pin. The command also
allows measurement of the voltage difference across two GPIO pins.
In differential mode, the full scale range may also be specified as 1 V
or 10 V. Note however that the pin input voltages must not exceed
the range 0..VDD_IO. The command returns the result as fraction of
the full scale range (1 V if none is specified). The GPIO pins
referenced should be initialized to analog mode before issuing this
command.
AT:SPI[(A|B|C|D)]=bytes SPI Transaction This command clocks out bytes on the SPI port. The clock frequency
is 312.5 kHz. The command returns the bytes read on MISO during out-
put. Optionally the clocking mode may be specified (default is A):
Mode Clock Inversion Clock Phase
A normal normal
B normal alternate
C inverted normal
D inverted alternate
Note that SEL, if needed, is not generated by this command,
and must instead be driven using standard GPIO commands
(AT:Pn=0|1).
AT:CLK=freq,reffreq Set Clock Generator Output a square wave on the pin(s) set to T mode. The frequency of
the square wave is (freq / 2
16
) × reffreq. Possible values for reffreq
are 20000000, 10000000, 5000000, 2500000, 1250000, 625000,
312500, 156250. Possible values if freq are 0…65535.
AT:CLK=OFF Turn off Clock Generator Switch off the clock generator
AT:CLK? Get Clock Generator Return the settings of the clock generator. Two numbers are
returned, freq and reffreq.
AT:DAC=value
Set SD DAC Output a SD DAC value on the pin(s) set to T mode. Parameter
value may be in the range −32768…32767. The average output
voltage is (1/2 + value / 2
17
) × VDD.
An external low pass filter is needed to get smooth output voltages.
The modulation frequency is 20 MHz. A possible low pass filter
choice is a simple RC low pass filter with R = 10 kW and C = 1 mF.
AT:DAC=OFF
Turn off SD DAC
Switch off the DAC
AT:DAC?
Get SD DAC
Return the DAC value
Table 11. REGISTERS
Number Name Description Default Range Units
300 Out Of Band
Period
AX−Sigfox sends periodic static
messages to indicate that they are
alive. Set to 0 to disable.
24 0−24 hours
302 Power Level The output power of the radio. 14 0−14 dBm
