© Semiconductor Components Industries, LLC, 2017
July, 2017 − Rev. 3
1 Publication Order Number:
AX−SFUS/D
AX-SFUS, AX-SFUS-API
Ultra-Low Power,
AT Command / API Controlled,
Sigfox
)
Compliant
Transceiver IC for Up-Link
and Down-Link
OVERVIEW
Circuit Description
AX−SFUS and AX−SFUS−API are ultra−low power
single chip solutions for a node on the Sigfox network with
both up− and down−link functionality. The AX−SFUS chip
is delivered fully ready for operation and contains all the
necessary firmware to transmit and receive data from the
Sigfox network in the US (SIGFOX RCZ2 region). It
connects to the customer product using a logic level RS232
UART. AT commands are used to send frames and configure
radio parameters.
The AX−SFUS−API variant is intended for customers
wishing to write their own application software based on the
AX−SF−LIB−1−GEVK library.
Features
Functionality and Ecosystem
• Sigfox up−link and down−link functionality controlled
by AT commands or API
• The AX−SFUS and AX−SF−API ICs are part of a
whole development and product ecosystem available
from ON Semiconductor for any Sigfox requirement.
Other parts of the ecosystem include
♦ Ready to go development kit
DVK−SFEU−[API]−1−GEVK including a 2 year
Sigfox subscription
♦ Sigfox Ready
®
certified reference design for the
AX−SFUS and AX−SFUS−API ICs
General Features
• QFN40 5 mm x 7 mm package
• Supply range 2.7 V* − 3.6 V
• −40°C to 85°C
• Temperature sensor
• Supply voltage measurements
*Includes the RF frontend module, circuit as in Figure 5. The
AX−SFUS chip alone is operational from 1.8 V to 3.6 V, a supply
voltage below 2.0 V is considered an extreme condition.
**Includes the RF frontend module, circuit as in Figure 5.
• 8 GPIO pins
♦ 2 GPIO pins with selectable voltage measure
functionality, differential (1 V or 10 V range) or
single ended (1 V range) with 10 bit resolution
♦ 2 GPIO pins with selectable sigma delta DAC
output functionality
♦ 2 GPIO pins with selectable output clock
♦ 3 GPIO pins selectable as SPI master interface
♦ RX/TX switching Control
Power Consumption**
• Ultra−low Power Consumption:
♦ Charge required to send a Sigfox OOB packet at
24 dBm output power: 0.28 C
♦ Deepsleep mode current: 100 nA
♦ Sleep mode current: 1.3 mA
♦ Standby mode current: 0.5 mA
♦ Continuous radio RX−mode at 905.2 MHz :
34 mA
♦ Continuous radio TX−mode at 902.2 MHz
230 mA @ 24 dBm
High Performance Narrow−band Sigfox RF Transceiver
• Receiver
♦ Carrier frequency 905.2 MHz
♦ Data−rate 600 bps FSK
♦ Sensitivity
−128 dBm @ 600 bps, 905.2 MHz, GFSK
♦ 0 dBm maximum input power
• Transmitter
♦ Carrier frequency 902.2 MHz
♦ Data−rate 600 bps PSK
♦ High efficiency, high linearity integrated power
amplifier
♦ Maximum output power 24 dBm
Applications
Sigfox networks up−link and down−link.
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