Broadcom BCM4775X GNSS Receiver with Integrated Sensor Hub
The Broadcom BCM4775X family of chips is the latest generation of Broadcom sensor hub microcontrollers with integrated GNSS (Global
Navigation Satellite System). The BCM4775X includes many sensors hub and GNSS innovations.
The synergistic benefits of combining sensor hub and GNSS chips into one single chip include low system-level power consumption and a smaller PCB
footprint with fewer BOM components than multiple-chip solutions. The BCM4775X family includes a dual-processor architecture (ARM CM4+CM0) that ensures each task is handled in the most power-efficient manner. The BCM4775X includes a new RF architecture, enabling the lowest power consumption at any received signal condition.
The BCM4775X achieves system-level performance benefits from tightly integrating the sensor and GNSS signals. Measurements from sensors such
as accelerometers, gyroscopes, magnetometers, and others are fused with GNSS measurements to provide a highly accurate, cross-calibrated output
to applications while lowering system power. Cross-calibration is achieved by using sensor measurements to aid GNSS for small movements and by
using GNSS to calibrate sensor measurements, the latter having inherent drift that accumulates over time and larger movements.
The BCM47755 chip supports two frequencies (L1+L5), and as a result, achieves lane-level accuracy outdoors and much higher resistance to
multipath and reflected signals in urban scenarios, as well as higher immunity to interference and jamming. The BCM47755 can simultaneously
receive the following signals
Key Features
• Integrated multi-frequency GNSS baseband and RF front end for simultaneous reception of GPS, GLONASS, BeiDou (BDS), Galileo (GAL), and SBAS satellite systems
• Support for position batching, geofencing, sensor fusion and sensor navigation
• ARM-based 32-bit Cortex-M4F (CM4) CPU:
−Single-precision Floating Point Unit (FPU)
−Memory Protection Unit (MPU)
−1.125 MB internal SRAM (single-cycle access at full-speed)
−1 MB ROM with bootloader capability
−Single Instruction Multiple Data
(SIMD) and Digital Signal Processing (DSP) functions
−1.25 Dhrystone MIPS/MHz
−Operating frequency up to 150 MHz
• ARM-based Cortex-M0 (CM0) CPU:
−Allows CM4 to sleep by offloading light processes
−32 KB RAM
−Operating frequency of up to 75 MHz
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