DESCRIPTION
Silicon Labs’ Si4020 is a single chip, low power, multi-channel FSK transmitter designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the 315, 433, 868, and 915 MHz bands. Used in conjunction with IA4320, Silicon Labs’ FSK receiver, the Si4020 transmitter feature EZRadioTM technology, which produces a flexible, low cost, and highly integrated solution that does not require production alignments. All required RF functions are integrated. Only an external crystal and bypass filtering are needed for operation.

FEATURES
• Fully integrated (low BOM, easy design-in)
• No alignment required in production
• Fast settling, programmable, high-resolution PLL
• Fast frequency hopping capability
• Stable and accurate FSK modulation with programmable deviation
• High bit rate (up to 256 kbps)
• Direct loop antenna drive
• Automatic antenna tuning circuit
• Programmable output power level
• Alternative OOK support
• EEPROM mode supported
• SPI bus for applications with microcontroller
• Clock output for microcontroller
• Integrated programmable crystal load capacitor
• Power-saving sleep mode
• Multiple event handling options for wake-up activation
• Push-button event handling with switch de-bounce
• Wake-up timer
• Low battery detection
• 2.2 to 5.4 V supply voltage
• Low power consumption
• Low standby current (0.3 µA)
• Compact 16-pin TSSOP package

TYPICAL APPLICATIONS
• Remote control
• Home security and alarm
• Wireless keyboard/mouse and other PC peripherals
• Toy control
• Remote keyless entry
• Tire pressure monitoring
• Telemetry
• Personal/patient data logging
• Remote automatic meter reading