Pittsford, New YorkAdding a USB (Universal Serial Bus) connection to your favorite micro or circuit, with baud rates up to 1-Mbit/s, is now as simple as adding eight pads to your target board on a standard 100-mil grid.
The 0.7 x 0.5-in. Micro-USB board from Saelig uses a standard USB B connector to connect to your PC using a standard USB cable, supporting simple connection to breadboards or printed circuit boards. Operating temperature range is -40°C to +85°C. The module is priced at about $25 a pop.
You can use a Micro-USB interface to readily create USB to RS-232 converters, and USB to RS-422/RS-485 converters, or to upgrade legacy RS-232 devices. The tiny module can enhance PDA (personal digital assistant) and cellphone USB interface cables, barcode readers, and point-of-sale terminals, to name a few applications.
Royalty-free rock-solid drivers are available for Windows 98SE, Windows 2000, Windows XP, Linux, and Macintosh operating systems.
Based on the SiLabs CP2101 chip, the Micro-USB device requires only ground, RX (receive), and TX (transmit) signal connections. The Micro-USB doesn't need any modem handshaking lines from the CP2101 chip. nonetheless, Suspend, Reset, and a 3.3-V regulated 100-mA source is conveniently available from the Micro-USB.
The CP2101 device is a single-chip USB to UART (universal asynchronous receiver-transmitter) bridge that converts data traffic between USB and UART formats. The chip includes a complete USB 2.0 full-speed function controller, bridge control logic, and a UART interface with transmit/receive buffers and modem handshake signals.
Click to view chip's block diagram
The SiLabs CP2101 chip also features an internal 1024-byte EEPROM, a voltage regulator, a USB transceiver, and an integrated internal oscillator. Those blocks essentially eliminate almost all external components generally required in USB applications.
The CP2101 also supports programmable and custom baud rates, and packs an integrated transceiver and precision clock. The device also supports USB suspend states.
Support For Modem Signaling
Micro-USB is optionally available with a pin-compatible CP2102. This version, unlike other USB ICs, supports all modem interface signals. These include hardware (X-On/X-Off) handshaking, and selection of 5-, 6-, 7-, 8-data bits, and 1-, 1.5-, 2-stop bits, as well as odd, even, mark, space or no parity. The CP2102 packs an on-chip 512-byte receive buffer and a 512-byte transmit buffer. It includes event character support as well.
The Micro-USB is available now from stock.
For more details, contact Alan Lowne at Saelig Co. Inc., 1160-D2 Pittsford-Victor Rd., Pittsford, New York 14534. Phone: 585-385-1750. Fax: 585-385–1768 E-mail: firstname.lastname@example.org
Saelig, 585-385-1750, www.saelig.com