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Bluetooth LED String Reference Design

Part Number: BLE-LED-ReferenceDesign

**For development reference only, not a product for sale**

Summary:

Microchip has developed a Total System Solution (TSS) that demonstrates how to drive and control two different color temperature LED strings via Bluetooth communication.

This reference design combines a buck LED driver (HV9961) with an 8-bit PIC16F15313 Microcontroller . The MCU communicates with the BLE module (RN4871) through UART  to create an intelligent LED Lighting Demo

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Product Features

    Power Supply
    The microcontroller and the BLE module is supplied offline, directly from the grid at 120/230Vac, by means of a bridge rectifier and a depletion Field-Effect Transistor DN2470. This is followed by a 3.3V Low-Dropout (LDO) Regulator MCP1703. This demo can be supplied from a wide input range; 50Vac to 265Vac.

    The demo offers an implementation of passive Power Factor Correction (PFC). It provides a PFC of at least 0.9 at 120Vac and 0.85 at 230Vac.

    LED Driver
    The demo uses the HV9961 buck LED Driver which is an average current mode control LED driver IC operating in a constant off-time mode. This control IC does not produce a peak-to-average error, and therefore greatly improves accuracy, line and load regulation of the LED current without any need for loop compensation or high-side current sensing. The output LED current accuracy is ±3%.

    Bluetooth Module
    The demo uses RN4871 Bluetooth Low Energy (BLE) module which integrates Bluetooth 4.2 baseband controller, on-board Bluetooth stack, digital and analog I/O and RF power amplifier into one solution. Bluetooth Low Energy (BLE) is a technology optimized for ultra-low power consumption instead of increasing the data rates available, making it the least power consuming wireless technology.

    The RN4871 introduces a private GATT service named as “Transparent UART”. This service simplifies serial data transfers over Bluetooth Low Energy (BTLE) devices. RN4871 Transparent UART seamlessly transfers serial data from its UART over a Bluetooth Low Energy connection and vice versa, providing an end-to-end data pipe between microcontroller and smartphone.

    Microcontroller
    The Microcontroller PIC16F15313 receives the data from Bluetooth module and controls the color temperature and intensity of the LED load according to the values set by user in the Mobile Application. It also retains the last set of values in flash memory which are used as default values on power up.

    LED Load
    The LED load used on this demo contains 20 LEDs; two interlaced strings of 10 LEDs in parallel. Every string has a different white color temperature (warm/cool). The load used for semo purposes is 30 V / 275 mA.

    Mobile Application
    The Mobile Application is used to connect to the demo board through Bluetooth protocol. It offers two slide bars used to vary the Brightness and White Color Temperature of the LED load. It also offers two buttons; one to switch ON/OFF the light and one to trigger a demonstrative function.

Summary

Microchip has developed a Total System Solution (TSS) that demonstrates how to drive and control two different color temperature LED strings via Bluetooth communication.

This reference design combines a buck LED driver (HV9961) with an 8-bit PIC16F15313 Microcontroller . The MCU communicates with the BLE module (RN4871) through UART  to create an intelligent LED Lighting Demo Solution.