Holtek HT16L21/HT16L23 1.8V Low Voltage Interface LCD Driver

11/23/2011

Some electronic systems using more advanced type master MCUs, may operate with interface voltages as low as 1.8V, however still have to provide high quality LCD display functions. In response to this need, Holtek has now released two new low voltage power supply and low voltage interface ICs, the HT16L21 and HT16L23. This series of devices are featured with a low 1.8V transmission interface and low VDD voltage, but can still provide higher VLCD voltages of up to 6.0V.

The HT16L21 and HT16L23 are suitable for an industrial temperature range of -40℃ to +85℃and have a wide operating voltage range of 1.8V~5.5V. They support applications where the VLCD voltage could be greater than, equal to or less than VDD and support four frame scanning frequencies of 64Hz, 85.3Hz, 128Hz or 170.6Hz. An internal regulator also offers an 8-level internal VLCD voltage which is setup using instructions. A full screen flicker function is provided for which there are a choice of three selectable frequencies as well as an internal LCD Bias circuit.

Functions integrated into the devices include an internal display memory, RC oscillator, 8 LED drivers and selectable 4 or 8 LED output lines. By incorporating internal I²C or SPI interfaces, data transmission between the HT16L2x devices and the controlling master device requires two or three signal lines. The high level of functional integration greatly lowers the need for external components, simplifies routing and reduces overall system costs. If the customer application requires only a few LED drive outputs, then a single HT16L2x can be used to complete the design.

The HT16L21, with 4 Commons x 32 Segments, is supplied in a 44-pin LQFP package. The HT16L23, with 4 Commons x 52 Segments or 8 Commons x 48 Segments, is supplied in 64-pin LQFP packages. For more details on display pixel count and package types, refer to the datasheet.

With enhanced ESD and EFT protection capabilities, the HT16L2x is suitable for applications such as home appliances, music systems, blue-ray video playback CD-ROMs, recorders, consumer products and industrial metering.