The TD242LP is a low power single chip USB Host and Peripheral controller that is the second controller in the family of integrated low-cost, high-performance, On-the-Go (OTG) controllers optimized and specifically designed for embedded systems, peripherals, mobile communication, and consumer products. The TD243 was the first controller in the USB OTG family delivered to the market by TransDimension. The TD242LP is a combination of a standard USB Host controller and an OTG Dual-Role Device controller. The TD242LP enables any embedded system to operate as a USB Host and Peripheral, thereby dramatically expanding the degree of interconnectivity and extending the applicability of USB into many new areas, especially low power, mobile markets. Software support for the TD242LP is available from SoftConnex Technologies, Inc., a wholly owned subsidiary of TransDimension Inc., and includes USBLink OTG Stack, ported to a wide variety of RTOSs, interface code to the TD242LP and USB device drivers. Peer-to-Peer connectivity is made simple with the TD242LP since USB connectivity is achieved without PC intervention. Applications include mobile and post-PC products such as cellular phone, palmtop PC, PDA, MP3 players, projectors, and Internet appliances, to name a few. The TD242LP can operate in the following modes: � USB On-the-Go Dual-Role Device: One OTG port plus a standard USB host with one downstream port � Simultaneous stand-alone host and device roles: Two USB ports (one OTG port and one standard USB port) � USB host role: One USB port (standard USB port)
The TD242LP is a low‑power, single‑chip USB On‑The‑Go controller that can act as both a host and a peripheral, enabling embedded systems such as cellular phones, PDAs, MP3 players and projectors to interconnect via USB without a PC. It supports multiple operational modes, including OTG dual‑role, simultaneous host/peripheral, and standard host with two downstream ports.
Key features include full‑speed (12 Mb/s) and low‑speed (1.5 Mb/s) compliance, high‑performance host bandwidth utilization, hardware‑implemented transaction scheduling, double/multi‑buffering for all transfer types, and an integrated PLL supporting 6 MHz, 12 MHz, 24 MHz and 48 MHz crystals. The device is memory‑mapped, offers a 3.3 V supply with 2.5 V‑3.3 V I/O, and provides up to 500 mA peripheral current when powered externally.