MSC-DKSW1 SILABS [Silicon Laboratories], MSC-DKSW1 Datasheet - Page 3

• Manufacturer Part Number: MSC-DKSW1
• Manufacturer: SILABS [Silicon Laboratories]

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:
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 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:
Mono-stable mode will be restarted as long as the proper Function Control Byte is received.
Preamble Byte
OUT3
F1
AAh
F1
0
0
1
1
OUT3
F0
Synchron Byte
F0
2DD4h
0
1
0
1
OUT2
F1
No change
Sets output logical low (LED is OFF)
Sets output logical high (LED is ON)
Sets output high in mono-stable mode, cycle time is 100 ms
OUT2
F0
Control Byte
See below
Function
Rev 1.1
OUT1
F1
Si4010-Keyfob-DEMO
One’s complement
Control Byte
Function
of Function
See below
OUT1
F0
OUT0
F1
Control Byte
See below
Function
OUT0
F0
3