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The Si4010 is a fully integrated crystal-less CMOS SoC RF transmitter with an embedded CIP-51 8051 MCU designed for the sub 1 GHz ISM frequency bands. This chip is optimized for battery powered applications with operating voltages from 1.8 to 3.6 V and ultra-low current consumption with a standby current of less than 10 nA. The high power amplifier can supply up to +10 dBm output power with 19.5 dB of programmable range. Moreover, the SoC transmitter includes a patented antenna tuning circuit that automatically fine tunes the resonance frequency and impedance matching between the PA output and the connected antenna for optimum transmit efficiency and low harmonic content. FSK and OOK modulation is supported with symbol rates up to 100 kbps. Like all wireless devices, users are responsible for complying with applicable local regulatory requirements for radio transmissions.