A Complete Cost-effective Remote Control Can Be Designed With The Si4010

Designing a remote control using the Si4010 overcomes many issues commonly found with traditional RF transmitters

. The Si4010 removes the difficult and tedious RF matching problem with its antenna tuning feature, which reduces expensive RF design time and improves time-to-market. The hardware task comes down to choosing the best PCB antenna for the given remote control geometry and laying out the pads and connections for the Si4010, the PCB trace antenna, a bypass capacitor, buttons and the battery. shows the PCB of a Si4010 remote control for 434 MHz operation.

Developing a remote control application is as easy using the Si4010 transmitters library of remote control functions stored in its 12 kB ROM. The library includes button service routines, AES encryption, encoding modules, battery voltage measurement and other useful remote control functions to reduce code size and speed time-to-market.

Upon battery insertion or waking up from standby mode from a button push, the Si4010 automatically begins the boot process of copying user code from the non-volatile memory (NVM) to the RAM followed by the running of user code. After booting, the digital blocks of the device are first initialized (the MCU, interrupts, timers, peripherals, etc.), and then the analog blocks are initialized with functions found in the ROM library. For example, the modulation type (OOK or FSK), data rate, PA transmit level, carrier frequency and so on are set during this phase.

When initialization is complete, the program enters the main loop where it monitors the GPIOs for button presses and manages event handling. Depending upon which button is pushed, the program decides what to do and then assembles the appropriate packet according to the button press. Then, the Si4010 fine tunes the frequency and transmits the packet. As soon as the information is transmitted, it shuts down and returns to the ultra-low-power standby state. In standby mode, the chip consumes less than 10 nA at 25 C and can wake up from any GPIO button press to begin the process again.

In summary, the Si4010 is a revolutionary transmitter that offers the lowest system cost solution for the remote control market. A complete cost-effective remote control can be designed with the Si4010, a battery, PCB and push buttons. No other transmitter solution available today matches the Si4010 ICs high level of on-chip integration. In addition, the Si4010 offers exceptional performance with its advanced RF features, including automatic antenna tuning to guarantee maximum transmit distance on every button press. The Si4010 transmitter is also very easy to use and reduces design complexity, which improves time-to-market. To learn more about designing remote controls with the Si4010 transmitter, visit www.silabs.com/Wireless and download the latest application notes.

by: Silicon Labs

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