Multifunctional dot matrix LED drivers come with serial interfaces

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By Julien Happich

The HT16D35A is supplied with a 3-wire interface type while the HT16D35B is supplied with an I2C interface type. A range of colour display functions are included such as scrolling, blinking, fade, swapping and matrix masking. As a result of these features the devices are suitable for use in applications such as colour LED billboards, gaming keyboards, rhythm lamps, fitness equipment, Bluetooth LED speakers and home appliances with colour display panels. A single HT16D35x IC can drive up to 72 RGB LEDs composed of 8 rows and 9 commons or 224 single-colour LEDs composed of 8 rows and 28 commons, however by cascading more HT16D35x devices together, larger LED panel sizes can be effectively driven.

Each row in the HT16D35x has a constant current output capacity for uniform display brightness. Each dot has a 64 level brightness setting, therefore if a dot is composed of RGB colours, it can display up to 262K colours; Each dot can be set with a 1s, 2s or 4s frequency for blinking or fade lighting effects; Each dot can also be set to scroll up, scroll down, or move left or right at one of 16 speeds.

By using the UCOM/USEG functions, any colour of rows or commons can be swapped or combined to create a new colour. In addition to the above mentioned features, many other LED function effects are also provided, which result in greatly reduced master MCU loading.

Holtek provides a graphics editing software tool for developers to setup and edit patterns and colours, set rolling functions, setup fade and other functions and then view the simulated display on their computer screen.

Holtek –


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