Implementing a Modular High Brightness RGB LED Network Using MC56F84452VLH
Created: Jan 21, 2016
The system is made of a controller, address switch, an LED driver, network interface and power supply connectors. The MC56F84452VLH operates on a single supply of 3.0V to 3.6V and has a 5V tolerant I/O except for RESETB pin. The MC56F84452VLH has an
The use of high-power LEDs is becoming popular in lighting applications. This design is an application of a DSC network that is used to drive a high power RGB LED matrix. The DSC features a high-speed serial peripheral that ensures fast communication between the network nodes. The DSC used is a MC56F84452VLH; this chip combines the processing power of a DSP and the functionality of an MCU. It is based on a 32-bit 56800EX core up to 60 MIPS at 60MHz core frequency.
The system is made of a controller, address switch, an LED driver, network interface and power supply connectors. The MC56F84452VLH operates on a single supply of 3.0V to 3.6V and has a 5V tolerant I/O except for RESETB pin. The MC56F84452VLH has an internal 8MHz relaxation oscillator. The use of an external clock reference is optional. The DSC drives the LED according to the data received from the RS485 or from the preset values stored on DSC internal flash memory. The PWM and analog-to-digital modules are responsible for displaying the desired color in its color-mixing algorithm. The three PWM channels are connected to field-effect transistors to control the buck switch for the LED current supply. The eight I/O's used for address and system setup configuration. The three analog-to-digital inputs are used to read the current flowing on the LEDS. The SCI is connected to a RS-485 transceiver, using three pins: Tx, Rx, and a GPIO for data enable. The connections: CN1, CN2, CN5, CN6 are connections to the pixel board.
The popularity of using high-power LEDs for lighting is increasing constantly, because of this the cost of these devices becomes more attractive. The MC56F84452VLH has a flexible set of peripherals to support many target applications in industrial control, home appliance, smart sensors, fire and security, motor control, medical, instrumentation, and lighting.