MCU with Four-Channel High-Current Drive for LED Arrays

Supporting high-brightness LED arrays, NEC has combined a Flash-based MCU with a four-channel constant-current driver that enables PWM dimming for up to 40 LEDs.

The µPD78F8024 integrates an 8-bit MCU featuring an I2C interface as well as four ADCs, enabling advanced features such as dynamic control using external sensors for temperature or ambient-light compensation.

The driver can be configured to provide four independent channels for applications that require flexible control of on-state, dimming level, and flashing sequence to generate a desired lighting effect. In entertainment lighting applications, this configuration can be used with the MCU’s UART interface to support DMX512-compliant lighting.

Using the four channels allows designers to build arrays of up to forty high-power LEDs. This configuration delivers extra brightness for signage and public-lighting applications, as well as built-in redundancy to protect against any open failures.

Further features supporting enhanced flexibility include a wide input-voltage range, from 9V to 38V, which enables designers to create a hardware platform that meets the requirements of various territories. Examples include emergency-vehicle systems that operate from a 12V supply in the USA and 24V in Europe.

 

FEATURES Output current range: 350mA to 1.5A 1MHz switching frequency Support for buck and boost converter modes 64-pin LQFP package

APPLICATIONS Architectural lighting Gaming machines Emergency-vehicle signage Theatre lighting Street lamps

 

 

 

• NIC Components’Quick Kit, page 090119

 

NEC / µPD78F8024