4010-DASKF-434 Datasheet, PDF (3/8 Pages) Silicon Laboratories – Si4010 SIMPLIFIED KEY FOB DEMO KIT USER’S GUIDE

Si4010-Keyfob-DEMO
3. Key Fob Demo
The 4010-DAPB key fob transmitter and the 4313-DAPB receiver are the transmit and receive devices used in the
key fob demo. This transmit/receive pair can be used to evaluate the capabilities of the Si4010 transmitter and the
Si4313 receiver.
The first step is to insert the CR2032 battery into the 4010-DAPB demo board and then place the board with the
battery into the plastic key fob case. Next, insert a battery in the 4313-DAPB receiver board and turn it on using the
switch on the board. The key fob first transmits an RF packet nine times (each time a button is pressed), and it also
blinks the LED. The packet structure is as follows:
Button1 .. AA AA AA AA 2D D4 D7 28 D7
Button2 .. AA AA AA AA 2D D4 F5 0A F5
Button3 .. AA AA AA AA 2D D4 5F A0 5F
Button4 .. AA AA AA AA 2D D4 7D 82 7D
Button5 .. AA AA AA AA 2D D4 FF 00 FF
(Then, the key fob also transmits two other packets appropriate for Silicon Labs Si4311 and Si4312 receiver demo
boards.)
The first four bytes are preamble, the next two is the sync word and the last three are the button info. Therefore if
any key pressed on the key fob, a combination of LEDs will light up on the Receiver Board according to the button
info part of the packet. The structure of the packets is detailed below:
Preamble Byte
Synchron Byte
AAh
2DD4h
Function
Control Byte
See below
One’s complement
of Function
Control Byte
See below
Function
Control Byte
See below
The structure of the Function Control Byte is shown below. For each LED output there are two bits assigned to
define their mode of operation:
OUT3
F1
OUT3
F0
OUT2
F1
OUT2
F0
OUT1
F1
OUT1
F0
OUT0
F1
OUT0
F0
OUT3 / F1 sent out first, OUT0–OUT3 represent the four LED outputs, F0–F1 represents the function bits.
Output functions controlled by the function bits are the followings:
F1
F0
Function
0
0
No change
0
1
Sets output logical low (LED is OFF)
1
0
Sets output logical high (LED is ON)
1
1
Sets output high in mono-stable mode, cycle time is 100 ms
Mono-stable mode will be restarted as long as the proper Function Control Byte is received.
Rev 1.1
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