Maxim's MAX3420E integrated circuit is a 12 Mbps USB peripheral controller with an SPI interface. This device integrates all the necessary digital logic and analog circuitry to implement a full-speed USB peripheral compliant to the USB specification 2.0. The company says the MAX3420E makes it easy to add USB to any microprocessor. Functions include: a ±15 kV ESD-protected USB transceiver; a USB serial interface engine (SIE); endpoint buffer memory; an SPI slave interface; integrated logic-level translators; and a 1,5 kΩ D+ pullup resistor. The MAX3420E operates using a register set accessed by the SPI interface, which operates up to 26 MHz. Any SPI master (microprocessor, ASIC, DSP, etc.) can add USB functionality using the 3- or 4-wire interface. The MAX3420E operates over -40 to +85°C and comes in a 7 x 7 mm, 32-pin TQFP and 4 x 4 mm, 24-pin TQFN package.
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