GNNS
Item Description
General Description
The RTL8771BW and RTL8771BF are high-performance GNSS single chips that support a multi-standard (GPS/ BeiDou/GLONASS) positioning solution. The RTL8771B(W/F) includes on chip RF, baseband, and RISC CPU. The RTL8771B(W/F) achieves high-performance low-SNR tracking/acquisition sensitivity, and fast Time-to-First-Fix (TTFF). The RTL8771B(W/F) supports up to 210 PRN channels, including 22 simultaneous tracking channels.
The RTL8771B(W/F) also provides various navigation applications including SBAS/DGPS (WAAS, MSAS, EGNOS, GAGAN, etc.) and AGPS, which speed the positioning time. An always-on backed-up memory and a real time clock are provided to accelerate acquisition at system restart up.
Featuring an on-chip integrated LNA, the RTL8771B(W/F) delivers a total receiver noise figure of 2.6 dB (before ADC). The RTL8771B(W/F) has on-chip regulators that are easily integrated into your system without requiring an extra voltage regulator. The crystal support feature allows users to implement low-cost design circuits with minimum BOM cost.
With an embedded 32-bits RISC controller running at 87/43.5MHz, the system performs time-critical processes, including data decoding and positioning. The real-time operating system also allows for efficient task scheduling.
The RTL8771B(W/F) offers an RS-232 data port and I2C interface for data exchange. The configurable RS-232 interface enables use of a higher data rate to send more data, as well as National Marine Electronics Association (NMEA) packets. Standard pre-defined HCI commands make the RTL8771B(W/F) easy and flexible to configure.
A time mark PPS pulse is generated by the RTL8771B(W/F), which is synchronized with GPS time. A General-purpose IO configured as Position-Fixed indicator allows customers to implement system functions. The general-purpose IO with power-on trap functions allows for easier system configuration.
Features
General
- 22 tracking/210 PRN-channel GNSS Receiver
- Multi-standard GPS/BeiDou/GLONASS/QZSS navigation system supported
- SBAS supported (at user request)
- AGPS supported (at user request)
- Supports TCXO
- Update rate of 1/2/5/10/20Hz
Reference Oscillator
- TCXO
- Frequency 26MHz
- Frequency maximum error: +/-2.5ppm
RF Configuration
- 5-bit IF I/Q signal
- RF Integrated in single chip
MIPS Compatible CPU
- 87/43.5MHz processor clock
- Supports MIPS16 instructions
Host Interface
- UART
- I2C (master for sensor/slave for navigation data)
NMEA
- NMEA 0183 standard (compatible to version 4.10)
GPIOs
- Position-Fixed signal
- Other General Purpose functions (at user request)
1PPS (Pulse per Second) Signal
- Support 30 ns(RMS) 1PPS jitter level
Working Temperature
-20~70 °C
Applications
Wearable
Tracker
Supplier Info
Realtek Semiconductor Corp
Realtek Semiconductor Corp., located in the Hsinchu Science-based Industrial Park — Taiwan’s “Silicon Valley” — began with a small group of young, devoted engineers in 1987. Over three decades, these young founding engineers built Realtek into one of the world’s largest and most successful IC design houses.
Realtek’s efforts to provide the ultimate in pioneering IC technology — along with its firm commitment to creating unique and innovative designs for a broad range of high-tech applications — have won the company a worldwide reputation and made possible a favorable and consistent growth rate in the years since its establishment. We attribute this achievement to Realtek’s tradition of excellence.
Through strength, persistence, and adaptability, Realtek follows in the spirit of the crab.
From establishment in 1987 by seven skilled and committed engineers, through several years of tough times, to today’s success as a premier IC design house, Realtek has overcome numerous challenges to achieve consistent growth. We value our ability to foresee market trends and demands and to commit ourselves to technological innovation to meet those demands.
We have positioned ourselves as designers and distributors of IC products developed through extensive research into market and customer needs. We recognize that the key to our success is in the value we provide to new technologies, products, applications, and markets.
Employees are Realtek’s most important asset, and as the pillars of a culture of confidence and trust, are recognized as the key to our success. Growing and optimistic individuals have demonstrated a positive impact on the company’s growth.
Realtek employees are empowered with authority and given freedom to make decisions to determine the best methods to approach issues. Employees are encouraged to develop freely and work autonomously, and are evaluated on ability and performance, under healthy and fair competition standards, allowing each individual to progress and achieve advanced corporate and personal goals. This philosophy has created a strong common identity and cohesiveness throughout Realtek, benefiting the pursuit of corporate success.
In line with the Realtek culture of “Self-confidence and trust in people”, we believe that we can achieve our best, and trust our colleagues can also do the same. Working and learning in Realtek, we openly share knowledge and experience with one another to inspire innovation and pursue growth of the company, as well the individuals.
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