Houston, TX – Texas Instruments Incorporated (TI) today announced the industry's lowest-power floating-point DSPs—the TMS320C6745 and TMS320C6747—as well as the OMAP-L137 floating-point DSP-plus-ARM applications processor. The three new devices offer a combination of low power, low cost, and connectivity that was previously available only in fixed-point processors. The devices target applications that can benefit from the high dynamic range, high precision, and easy development process associated with floating-point, including audio, medical, and industrial applications.
All three of the new devices run at 300 MHz. The least-expensive processor is the C6745, which is priced at $10.41 in 100-unit quantities. The C6745 is notable for its connectivity options, which include 10/100 Ethernet, MMC/SD, and USB 2.0. The C6745 is TI's first floating-point DSP to offer any of these peripherals. Previously, these peripherals were only available on fixed-point devices.
Figure 1. The C6745 is TI's first floating-point device with Ethernet, MMC/SD, or USB 2.0.
The C6747 includes all of the features of the C6745 and adds an additional USB 1.1 port and a QVGA LCD controller. The C6747 also incorporates an additional 128 KB of on-chip RAM. It is available for $11.72 in 100-unit quantities.
Figure 2. The C6747 adds a USB 1.1 port, LCD controller, and 128 KB of RAM.
The OMAP-L137 applications processor is a pin-compatible upgrade to the C6747. It adds an ARM9 subsystem to the feature list. The ARM9 can run full-featured operating systems such as Linux and WinCE, allowing it to handle graphical user interfaces (GUIs), network stacks, and other high-level tasks. This is the first time TI has paired an ARM and a floating-point DSPs. The combination promises to significantly lower system costs in products that require both types of processor. (The OMAP-L137 itself is priced at $18.93 in 100-unit quantities.)
Figure 3. The OMAP-L137 adds an ARM9.
The key take-away for the three new devices is that they offer capabilities previously available only in TI's fixed-point devices. (Other vendors like Renesas offer floating-point devices with similar peripherals, but these parts are generally higher-end devices with higher prices.) Thus, the new TI devices make it possible to use floating-point in applications that were previously stuck with fixed-point processors. In this context, the main advantage of the new devices is the faster time to market associated with floating-point development.
The three devices also boast impressive power numbers. TI gave a hint of what to expect when it announced its low-power roadmap in July. As promised, the devices TI announced today offer three times more MMACs/mW than competing DSPs. (MMACs, or millions of multiply accumulates per second, is a rough measure of DSP performance.)
Figure 4. TI vs. Analog Devices SHARC: Floating-point MMAC/mW.
In July, TI boasted that its floating-point devices would feature a new deep sleep mode that would drop standby power by 20X. However, TI has not implemented this mode on its first three devices—that feature is coming on future devices. The devices announced today burn 62 mW in standby mode—a much higher number than what TI promises for future parts, but still relatively frugal. For example, the new devices consume only about half as much standby power as previous TI floating-point parts.
The C6745 DSP, C6747 DSP and OMAP-L137 applications processor are supported by the OMAP-L137/C6747 Floating-point Starter Kit, which comes with Linux and DSP/BIOS. The kit is priced at $395. The C6745, C6747 and OMAP-L137 are object code compatible with all devices based on the C64x+ and C67x+ cores, making code porting easy.
Customers place orders for the C6745, C6747, and OMAP-L137 now. For more information, go to www.ti.com/lowpowerprocessorsee.