Si4012 Crystal-less RF Transmitter Description Features Silicon Laboratories’ Si4012 is a fully integrated crystal-less CMOS high-data rate RF transmitter designed for the sub-GHz ISM band. This chip is optimized for battery powered applications requiring low standby currents and high output transmit power. The device offers advanced radio features including continuous frequency coverage from 27–960 MHz, adjustable output power of up to +10 dBm, and data rates up to 100 Kbaud in FSK mode. The Si4012’s high level of integration offers reduced BOM cost while simplifying the overall system design. - Frequency Range = 27–960 MHz - FSK and OOK modulation - Output Power - Maximum: +10 dBm - Configurable: –13 to +10 dBm - Crystal-less operation - ±150 ppm: 0 to + 70 °C - ±250 ppm: –40 to + 85 °C - Optional crystal input for tighter tolerances - Data Rate - FSK: 0.1 to 100 Kbaud - OOK: 0.1 to 20 Kbaud - Power Supply = 1.8 to 3.6 V - TX 256 byte FIFO - Low battery detector - SMBus interface - –40 to +85 °C temperature range - 10-pin MSOP, Pb free/RoHS compliant The transmitter supports data streaming into the TX FIFO without external MCU support. The digital transmit modulation and automatic PA power ramping ensure precise transmit modulation and reduced spectral splatter, ensuring compliance with FCC, ETSI, and ARIB regulations. Additional system features such as the low battery detector and 256 byte TX FIFO reduce overall current consumption and allow the use of lower-cost system MCUs. The Si4012 is optimized for wireless MBUS T1-mode. The device leverages Silicon Labs' patented and proven crystalless oscillator technology and offers better than ±150 ppm carrier frequency stability over the temperature range of 0 to + 70 °C and ±250 ppm carrier frequency stability over the industrial range of –40 to +85 °C without the use of an external crystal or frequency reference. The Si4012 automatically calibrates the on-chip voltage controlled oscillator (LCOSC) which forms the output carrier frequency for process and temperature variations. An external 1-pin crystal oscillator option is available for applications requiring tighter frequency tolerances. The Si4012 is designed to work with an MCU and a few passives to create a very low-cost system. Voltage regulators are integrated on-chip, which allows for a wide range of operating supply voltage conditions from +1.8 to +3.6 V. Digital integration reduces the amount of required external components compared to traditional offerings. The high integration of the Si4012 improves the system manufacturing reliability, quality, and minimizes costs. This chip offers industry leading RF performance, high integration, flexibility, low BOM, small board area, and ease of design. No production alignment is necessary as all RF functions are integrated into the device. Applications - Remote meter reading Wireless MBUS T1-mode Remote control Remote keyless entry Home security and alarm Telemetry Toy control Home automation Industrial control Sensor networks Health monitors Si4012 DIGITAL LOGIC SDA SCL SMBus INTERFACE RF ANALOG CORE ANTENNA TUNE OOK MODULATOR TX 256 BYTE DATA FIFO LED GPIO0/XTAL PA AUTO TUNE TXP TXM LCOSC LPOSC VA DIGITAL CONTROLLER SLP TMR REGISTER BANK EZRadio DIVIDER FSK SDN nIRQ XTAL OSC Copyright © 2010 by Silicon Laboratories VD LDO POR BANDGAP VDD GND BATTERY MONITOR 6.18.10 Si4012 Crystal-less High-data Rate RF Transmitter Selected Electrical Specifications Parameter Symbol Min Typ Max Unit 1.8 — 3.6 V Lowest current mode — 100 — nA IIdle Register values retained, lowest current consumption idle mode — 700 — nA ITune Register values retained, LCOSC on, fastest response to TX mode — 5 — mA ITX_OOK OOK, Manchester encoded — 14.2 — mA ITX_FSK FSK — 19.8 — mA tShutdown-TX — 21.4 — ms tShutdown- — 16.4 — ms ms Supply Voltage Range Test Condition Vdd IShutdown Power Saving Modes TX Mode Current @ +10 dBm Mode Response Time to TX Idle Frequency Range tIdle-TX — 5 — tTune-TX — 100 — us FRange 27 — 960 MHz 0 to + 70 °C –150 — +150 ppm –40 to + 85 °C –250 — +250 ppm Error contribution using optional crystal –10 — +10 ppm Allen deviation, measured across 1ms interval — 0.3 — ppm Carrier Frequency Accuracy Frequency Noise (rms) Frequency Tuning Time FSK Modulation Data Rate DRFSK OOK Modulation Data Rate DROOK Transmit Power — 5 — ms 0.1 — 100 Kbaud 0.1 — 50 Kbaud Configurable output power range with optimum load and VDD > 2.2 V –13 — +10 dBm Power variation vs temp and supply, with optimum load and VDD > 2.2 V –1.0 — +0.5 dB Power variation vs temp and supply, with optimum load and VDD > 1.8 V –2.5 — +0.5 dB Step size from –13 to +6.5 dBm with optimum load and VDD > 2.2 V — 0.25 — dB — 300 — ppm –40 — 85 °C FSK Deviation Operating Ambient Temperature Range TA MSOP-10 Pin Package Symbol Min Nom Max Symbol GPIO0/XTAL 1 10 SDA A — — 1.10 e GND 2 9 SCL A1 0.00 — 0.15 L 8 SDN A2 0.75 0.85 0.95 L2 b 0.17 — 0.33 q 0° — 8° c 0.08 — 0.23 aaa — — 0.20 bbb — — 0.25 TXM 3 Si4012 TXP 4 7 nIRQ VDD 5 6 LED D 3.00 BSC Min Nom Max 0.50 BSC 0.40 0.60 0.80 0.25 BSC E 4.90 BSC ccc — — 0.10 E1 3.00 BSC ddd — — 0.08 Notes: 1. 2. 3. 4. All dimensions are shown in millimeters (mm). Dimensioning and tolerancing per ASME Y14.5M-1994. This drawing conforms to JEDEC Outline MS012, variation ”BA.” Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. Copyright © 2010 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders 6.18.10 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. 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