LSQ976-NR-1-0-20-R18 datasheet(16/50 Pages) MICROCHIP

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Wireless Security Remote Control Development Kit User’s Guide

DS41646A-page 16

 2012 Microchip Technology Inc.

FIGURE 2-1:

PLUG THE SX1239 RECEIVER PICtail™ DAUGHTER CARD

INTO THE EMBEDDED SECURITY DEVELOPMENT BOARD

5. Power-up the Embedded Security Development Board.

To power the Embedded Security Development Board from the USB port, connect the

USB A to mini-B cable to the development board and an available USB port or USB

power source. Set jumper J6 to pins 1-2. When using a USB port for power, there is no

requirement to load the USB drivers.

To power the Embedded Security Development Board from an external power supply,

connect test points labeled +VEXT and GND to a bench power supply set to 3.3 VDC.

Place jumper J6 to pins 2-3.

2.5

DEMO OPERATION

The pre-programmed demo is used to demonstrate the basic operation of Microchip

Remote Keyless Entry (RKE) solutions. The demo highlights capabilities of transmitting

and receiving data that is secured over the air. Two different methods, KEELOQ® Classic

and KEELOQ® AES, are used in this demo.

2.5.1

Key Fob as Transmitter

The pre-programmed demonstration shows how to secure information during data

transmission. Pressing any one of four buttons on the red key fob, the information

about the pressed button will be encrypted and transmitted. When data is being

transmitted, the LED on the key fob will flash. Two ways to secure the information have

been shown in this demo: KEELOQ Classic and KEELOQ AES. When button 1 or 2 (see

Figure 2-2) is pressed, the information is secured with KEELOQ Classic before the

transmission; when button 3 or 4 (see Figure 2-2) is pressed, the information is secured

with KEELOQ AES before the transmission.

For details on KEELOQ Classic and KEELOQ AES, please refer to Microchip application

notes AN1259, “KEELOQ® Microcontroller-Based Code Hopping Encoder” and AN1265

“KEELOQ® with AES Microcontroller-Based Code Hopping Encoder”.

The key fob has four push buttons and is powered by a CR2032 coin battery. The key

fob is shown in Figure 2-2, where the four buttons are labeled individually.

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