Semtech and Microchip Technology introduced the SX1230-13RKEA433 turnkey reference design for multi-band wireless remote keyless entry (RKE) systems. The reference design integrates Semtech’s transmitter and transceiver ICs with Microchip’s KEELOQ code-hopping technology running on PIC microcontrollers (MCUs). The platform is ideal for the development of secure, high-performance and cost-effective RKE systems for vehicles, office buildings, and homes. SX1230-13RKEA433 provides a single platform that works across virtually all major frequency regulations. The reference design kit is available now from Semtech.
SX1230-13RKEA433 Remote Keyless Entry Reference Design Features
- Hardware: integrated RF ICs, multi-band PCB antenna, MCU
- Semtech’s SX1230 industrial, scientific and medical (ISM) band transmitter
- Semtech’s SX1211 or SX1212 ISM transceivers
- Microchip’s PIC16F631 or PIC16F677 8-bit MCUs
- Software: KEELOQ code-hopping encryption software
- Encrypts all RF packets before sending, no plain text sent over air
- Code-hopping encryption produces unique RF transmission each time
- Saves design cost and time — same design supports multi-band (315, 434, 868, 915 MHz) and multiple modulation formats (FSK, OOK, ASK)
- No tuning for lower production costs
- Long range: programmable POUT up to +17 dBm
The SX1230 is a multi-band ISM transmitter that complies with virtually all major country-specific radio regulations. It is fully configurable and dynamically programmable for narrowband and wideband applications in the 315, 434, 868 and 915 MHz license-free ISM frequency bands, and works with FSK, GFSK, MSK, GMSK and OOK modulation formats up to 600 kb/s, with constant RF performance over the 1.8V to 3.7V operating range. The device features 30 mA current consumption at +10dBm output power and 500 nA sleep mode current for increased battery life. RF output power is programmable up to +17 dBm in 1 dB steps from -20 dBm.
The SX1210/1/2/3 family offers a broad range of pin-to-pin compatible ISM-band transceivers and receivers, covering all worldwide unlicensed bands from 300 MHz to 510 MHz and from 863 MHz to 960 MHz. The family features receiver (Rx) current consumption of less than 3 mA, while providing high bit rates of more than 150 kbps, along with a packet engine and complete flexibility via register programming.
The KEELOQ security algorithm encrypts information in the RF transmission packets before they are transmitted, unlike some existing RKE systems in the market. The solution stores confidential information inside the Flash memory of the PIC microcontroller and then encrypts it inside each data packet, prior to any RF transmission. The KEELOQ code-hopping algorithm creates a unique transmission on each activation of the transmitter, rendering replay attacks useless. The combination of a 64-bit key length and KEELOQ code-hopping technology significantly reduces the possibility of unwanted access or security breaches.