User's Manual

User Manual

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.

EM7128 is a low-power I2C interface module includes Heart Rate Sensor (HRS) and

internal LED Current Drivers with 1 Green LED. It can work in both continuous mode

and pulse mode. It is designed for applications of Heart Beat Rate detection esp.

such as smart watch etc.

Heart Rate Sensor in continuous mode is designed to monitor heart rate by optical

detection. A 16-bit ADC detects the result constantly with adjustable gain and

resolution.

HRS in continuous mode stores ADC output result into HRS registers, All pixels are

controlled by analog-MUX in different modes.

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User Manual 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.
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FCC Warning This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.