BOARDCOM BCM47758KUB1G Gnss receiver with integrated sensor hub Datasheet

Product Brief
BCM4775X
GNSS Receiver with Integrated Sensor
Hub
Overview
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 sensor 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.
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
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:
• GPS L1 C/A
• GLONASS L1
• BeiDou (BDS) B1
• QZSS L1
• Galileo (GAL) E1
• GPS L5
• Galileo E5a
• QZSS L5
GNSS Receiver with Integrated Sensor Hub
Product Brief
Key Features (con’t)
• Peripheral DMA channels for increased
peripheral communications speed
• Up to 50 programmable GPIOs
The BCM47758 chip is tailored for wearable devices, computes position,
velocity, and time (PVT) on-chip. It simultaneously supports GPS and
GLONASS in the L1 frequency band or GPS and Galileo in both the L1/E1
and L5/E5a frequency bands. By doing on-chip PVT computations and
position batching, system power is significantly reduced by allowing the
host applications processor to sleep.
• Integrated 12-bit, 2-channel ADC
The BCM47758 also uses a low-power RF path and enables a variety of
duty-cycle strategies to further reduce power consumption.
• Flexible interfaces to a host
Applications Processor and to sensors:
Benefits
−− SPI: Two master ports for
peripherals + 1 slave port for host
communication
• Highest levels of navigation performance.
• Very low GNSS and sensor hub power consumption.
−−UART: Four ports for host and
peripheral communication.
• Small PCB footprint (saves 50% board space over discrete sensor hub +
GNSS solutions).
−−BSC (I²C): Four ports (three master,
one slave), peripheral only
• On-chip PVT calculations available on BCM47758.
• Timers:
−−One Real-time Clock (RTC) (42 bits,
32.768 kHz)
−−Two general-purpose 32-bit
microsecond timers
−−One 48-bit microsecond counter for
better resolution timestamps than
the RTC can provide
Applications
• Smartphones
• Tablets
• Mobile accessories
• Wearables
• Digital cameras
• 77-ball WLBGA package
Ordering Information
Part Number
Package
BCM47752KUB1G
77-pin WLBGA, tape-and-reel
BCM47754KUBG
77-pin WLBGA, tape-and-reel
BCM47755KUB1G
77-pin WLBGA, tape-and-reel
BCM47758KUB1G
77-pin WLBGA, tape-and-reel
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4775X-PB100 09.20.17
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