Hardware Update – New Radio Board
We are currently evaluating the CC1120 Sub-Ghz radio from TI. Our existing solutions use the CC1101 Sub-Ghz radio (again from TI).
Here is a pic of the first version of our WSN1120l mesh node. The radio board is mated to our micro PCB which hosts the MSP430G2955 ultra-low power 16 bit micro from TI. Our modular design allows us to easily change the radio and micro-controller.
The CC1120 radio board (WSR1120) has a PCB antenna as well as a U.FL connector to connect to an external antenna. We will be offering two different CC1120 radio boards (one with a PCB antenna and the other with U.FL connector). The U.FL version will have a smaller form factor (similar to our CC1101 radio board which is 30 mm x 27.5 mm).
This node will also operate in the 865-867 MHz license free band in India.
The CC1120 radio control and user interface are based on the widely used CC1101 transceiver. This relationship enables an easy transition between the two platforms. The command strobes and the main radio states are the same for the two platforms.
Here are some of the key differences between the CC1101 radio and the CC1120 radio. Will include selectivity/blocking in another post. The table shows that the CC1120 is better in every respect except that it costs more.
|Data FIFO||RX-64 / TX-64||RX-128 / TX-128|
|Data Rate||0.6 to 600 kbps||0 to 200 kbps|
|Sensitivity||–112 dBm @ 1.2 kBaud
||-123 dBm @ 1.2 kbaud
|Max Tx Power||+10 dBm||+14 dBm|
|Operating supply Voltage||1.8V to 3.6V||2.0V to 3.6V|
|IO||GPIO0, GPIO2||GPIO0, GPIO2, GPIO3|
|External Crystal Oscillator||26 MHz||32 MHz|
|Digital channel filter programmable BW (CHF)||58 KHz to 812 KHz||8 KHz to 200 KHz|
|Narrow-Band||No||Narrow-band Wireless Systems With Channel Spacing Down to 12.5 kHz|
|RF carrier phase noise (indicates quality of carrier signal)||-92 dBc//HZ at 40kHz offset||-111 dBc/HZ at 10kHz offset
|Support for re-transmissions||No||Yes|
|Support for auto acknowledgments||No||Yes|
|TCXO Support and Control
(Temperature compensated crystal oscillator)
For more information on WiSense, please visit wisense.in.