Si4010-RC-DEMO
3. RF Parameters
The demo kit uses the following RF parameters according to the kit’s frequency band.
Kit Part Number
EZR-LEDK1W-434
EZR-LEDK1W-868
EZR-LEDK1W-917
The modulation is FSK.
Center Frequency
433.92 MHz
868.30 MHz
917.00 MHz
Deviation
59 kHz
119 kHz
120 kHz
4. Transmitter Side Program
The Si4010 in the key fob programmed with the rke_demo_2 program. Since the program is burned in the NVM
(OTP) memory of the Si4010, it cannot be changed. The whole rke_demo_2 software project can be found in the
example programs package of the Si4010. It is available at the web page
The key fob transmits an RF packet three times each time a button is pressed, and it also blinks the LED on the key
fob. The packet structure is as follows:
Number of Bytes
13
2
4
1
2
2
Symbol rate is 9.6 kBd.
Each packet contains 18 additional bytes that are not received by the receiver of this demo. These additional bytes
are AES-encrypted and are used by the AES demo kit. See details in the user’s guide of the AES demo kit (P/N
4010-AESK1W-434).
In the key fob program the frequency and deviation is pin-selected by the pcb layout. This operating frequency is
indicated on a label on the back of the key fob pcb.
GPIO8
High
High
Low
Low
GPIO9
Low
High
High
Low
Center Frequency
316.66 MHz
433.92 MHz
868.30 MHz
917.00 MHz
Deviation
Field Name
Preamble
Sync
Chip ID
Status
Packet count
CRC-16
Description
0xaa
0x2d, 0xd4
Unique, factory-burned chip ID
Lower 5 bits are the button information
Rolling counter for PER measurement
Generator X16+X15+X2+1, start value 0xFFFF
43 kHz
59 kHz
119 kHz
120 kHz
The 316.667 MHz key fob is available in the 4010-AESK1W-315 demo kit or separately from Silicon Labs.
The key fob’s default modulation is FSK but if the middle button is pressed and held during battery insertion, the
modulation will be OOK until the next powerdown (battery removal).
Rev. 0.2
3
SILABS [ SILICON LABORATORIES ]
