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USB OTG transceiver
13 July 2005, Telecoms, Datacoms, Wireless, IoT
MIC2555 is a USB on-the-go (OTG) transceiver from Micrel designed to enable intelligent self-powered devices to communicate on a peer-to-peer basis with other USB and USB OTG enabled devices.
Designed to perform as a PHY for USB serial interface engines (SIE), it is compatible with a wide variety of standalone OTG SIE chips, OTG IP cores and ASSPs.
MIC2555 is fully compliant to USB-IF's Universal Serial Bus Specification 2.0 and the On-The-Go Supplement Rev 1.0a, for low speed and full speed operation, and allows dual-role device operation via an I²C-based controller interface. The controller's robust register set permits full control over bus and interface activity for transacting session request protocol (SRP) and host negation protocol (HNP) sequences.
Messaging between host and target devices can utilise any of two signalling methods: USB or UART, and MIC2555 permits audio signalling on its D+, D- and ID lines in full support of analog car kit applications. USB communication is complemented with on-chip D+, D- pull-up/pull-down resistors, an integrated charge pump and low dropout voltage regulators to provide stable internal supply voltages and to supply VBUS power when operating as an A-device. Logic input levels spanning 1,6 to 4,5 V ensure compatibility with current and future generations of process technology. |
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