AX−SIGFOX

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8

Table 5. LOGIC

Symbol

Description

Condition

Min

Typ

Max

Units

Digital Inputs

Schmitt trigger low to high threshold point

VDD_IO = 3.3 V

1.55

V

Schmitt trigger high to low threshold point

1.25

V

Input voltage, low

0.8

V

Input voltage, high

2.0

V

Input voltage range, GPIO[3:0]

−0.5

VDD_IO

V

Input voltage range, GPIO[9:4], UARTRX

−0.5

5.5

V

Input leakage current

−10

10

mA

Programmable Pull−Up Resistance

65

kW

Digital Outputs

Output Current, high

Ports GPIO[9:0], UARTTX, TXLED, RXLED,

TXLED, CPULED

8

mA

Output Current, low

GPIO[9:0], UARTTX, TXLED, RXLED, TXLED,

CPULED

8

mA

Tri−state output leakage current

−10

10

mA

AC Characteristics

Table 6. TCXO REFERENCE INPUT

Symbol

Description

Condition

Min

Typ

Max

Units

TCXO frequency

A passive network between the TCXO output

and the pins CLKP and CLKN is required.

For detailed TCXO network recommendations

depending on the TCXO output swing refer to

the AX5043 Application Note: Use with a

TCXO Reference Clock.

For TCXO recommendations see the

Ax−Sigfox Application Note: Sigfox Compliant

Reference Design

48

MHz

Table 7. TRANSMITTER

Conditions for transmitter specifications unless otherwise specified with the antenna network from AX−Sigfox Application Note: Sigfox

Compliant Reference Design and at 868.130 MHz.

Symbol

Description

Condition

Min

Typ

Max

Units

SBR

Signal bit rate

100

bps

Lowest Transmitter output power

AT$CW=868130000,1,0

0

dBm

Highest Transmitter output power

AT$CW=868130000,1,14

14

dBm

Programming step size output power

1

dB

Transmitter power variation vs.

temperature

−40°C to +85°C

±0.5

dB

Transmitter power variation vs. VDD_IO

1.8 to 3.6 V

±0.5

dB

−51

dBc

−63

−84