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ST embeds radio section in digital single-chip GPS receiver

Posted: 27 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? sta2056? gps? global positioning system?

STMicroelectronics disclosed that it has developed a single-chip GPS (global positioning system) for active antenna systems featuring the complete RF function, GPS base-band, an ARM7TDMI processor and peripherals on a single piece of silicon.

The new STA2056 combines GPS performance with low power consumption. According to the company, it is the first-ever device successfully embedding the radio section into a digital single-chip GPS receiver, requiring no external host CPU and memory to achieve both satellite tracking and position calculation.

A low phase noise voltage controlled oscillator/phase locked loop, IF (Intermediate Frequency) filters, mixer, and LNA (low noise amplifier) are all included in the RF section of the STA2056, developed using a 0.18?m CMOS process, which reduces the number of external components. Only an active antenna, a crystal, and few passive devices for input match are required to complete the application. Despite its high level of integration and increased RF requirements for microprocessor co-existence, the STA2056 draws only 37mA in typical operating mode.

The on-chip peripherals include a CAN 2.0 B active interface and a four-channel 12bit A/D. In addition, I?C, UART (Universal Asynchronous Receiver-Transmitter), SPI (Serial Peripheral Interface), and GPIO (General Purpose Input / Output) complete the range of available interfaces. The availability of an embedded 4KB back-up RAM allows the storing of GPS information.

The GPS code is available in ROM for the full GPS function with both EGNOS (European Geostationary Navigation Overlay Service) and WAAS (Wide Area Augmentation System) capability. Core frequency (up to 66MHz), ROM size (256KB) and on-chip peripherals/interfaces are provided such that the STA2056 can be used as a host CPU in a telematic unit.

Designed for in-vehicle telematics and navigation OEM applications, the STA2056 is housed in a space-saving QFN68 package. A development version with flash external memory interface (TQFP 176-pin package) is also available for custom code development before freezing a production-ROM version.

Samples of the STA2056 are already available Pricing in quantities of 100,000 pieces will be below $8, ST said.

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