Block Diagram

Figure 1 shows the block diagram of GR551x.

• Bluetooth Subsystem
  • A 2.4 GHz transceiver and a digital communication core that supports Bluetooth LE 5.1.
• MCU Subsystem
  • An ARM^® Cortex^®-M4F with all the required memories and peripherals.
  • Security cores that can be used for application security and to secure boot implementation.
• Power Management Unit (PMU) Subsystem
  • All the required power management modules to supply sufficient power to both internal modules and external peripherals.
  • Modules required for ultra-low-power operation are in standby mode. CPLL_192M, RNG_OSC, LFRC_32K, wakeup GPIOs (Wake up), low-power comparator (LP Comp.), and power state controller (Power Sequencer) are used to control the state of different modules.