GR551x Overview

The Goodix GR551x family is a single-mode, low-power Bluetooth 5.1 System-on-Chip (SoC). It can be configured as a Broadcaster, an Observer, a Central, or a Peripheral and supports the combination of all the above roles, making it an ideal choice for Internet of Things (IoT) and smart wearable devices.

Based on ARM^® Cortex^®-M4F CPU core, the GR551x integrates Bluetooth 5.1 Protocol Stack, a 2.4 GHz RF transceiver, on-chip programmable Flash memory, RAM, and multiple peripherals.

GR551x SoCs are available in multiple packages (see Table 1) that meet your diverse project demands.

Table 1 GR551x series

Features	GR5515IGND	GR5515IENDU	GR5515I0NDA	GR5515RGBD	GR5515GGBD	GR5513BEND	GR5513BENDU
CPU	Cortex®-M4F	Cortex®-M4F	Cortex®-M4F	Cortex®-M4F	Cortex®-M4F	Cortex®-M4F	Cortex®-M4F
RAM	256 KB	256 KB	256 KB	256 KB	256 KB	128 KB	128 KB
Flash	1 MB	512 KB	N/A	1 MB	1 MB	512 KB	512 KB
Package (mm)	QFN56 (7 x 7 x 0.75)	QFN56 (7 x 7 x 0.75)	QFN56 (7 x 7 x 0.75)	BGA68 (5.3 x 5.3 x 0.88)	BGA55 (3.5 x 3.5 x 0.60)	QFN40 (5 x 5 x 0.75)	QFN40 (5 x 5 x 0.75)
I/O Number	39	39	39	39	29	22	22