EDN

EDN, May 26, 2011

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SIMPLIFY USB CONNECTIVITY IN EMBEDDED DESIGNS With the rapid proliferation of USB and HID-USB in the embedded world, developers are looking for painless, economical ways to embed USB connectivity in their designs. A leading supplier of USB connectivity solutions, Silicon Labs offers complete solutions to retrofi t existing designs or build new designs including USB. Silicon Labs' CP21xx USB bridge ICs eliminate software complexity and driver compatibility issues, providing a cost-effective, small-footprint turnkey solution for adding USB and human interface device (HID)-USB connectivity to legacy embedded systems. C8051F3xx USB MCUs are ideal for applications requiring cost effective, robust analog and digital peripherals and high performance processing capabilities. These USB MCUs feature an on-board fully integrated universal serial bus (USB) 2.0 function controller and transceiver. No external resistors, crystal or voltage regulator are required. Best-in class on-chip analog peripherals include a multi-channel high performance ADC, up to 500 Ksps, comparators and internal voltage reference. Silicon Labs makes it easy to add USB to embedded designs. CP21xx USB BRIDGE :: FEATURES • USB 2.0 compliant, full-speed (12 Mbps) • No external crystal required • Up to 1024 Bytes of EEPROM or EPROM • User programmable custom Baud rates • Supports all modem interface signals • Baud rates up to 2 Mbps • Industrial temperature range -40 to 85 °C • SMBus master device (CP2112) • HID class support, no drivers needed (CP2112) • 512 B SMBus data buffer (CP2112) C8051F38x USB MCU :: FEATURES VBUS Voltage Regulator D– D+ USB Transceiver 48 MHz Oscillator TX USB Function Controller EEPROM or EPROM Buffer RX Buffer UART (CP2105 Only) EASY USB COMMUNICATION UART UART I/F (Modem) Control (Some Devices) I/O • USB 2.0 compliant, full-speed (12 Mbps) • No external crystal required • 32/64 kB Flash, 2/4 kB RAM, 1 kb USB buffer • 2 comparators • Internal voltage reference • 4 16-bit timers • SPI, 2 SMBus/I2C, up to 2 UARTS • Multi-channel 10-bit ADC up to 500 Ksps • 16-bit programmable counter array • External memory interface See how easy it is to add USB to your embedded design: Download the white paper "USB Simplifi ed." www.silabs.com/usb ©2011 Silicon Laboratories Inc. All rights reserved. USB-TO-UART BRIDGE BLOCK DIAGRAM

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