HGSEMI HT1621

The HT1621 is a peripheral device used to expand the I/O ports of an MCU. With a display matrix of 32×4, it is a 128-pattern RAM mapping multi-function LCD driver. The software features of the HT1621 make it well-suited for LCD display applications, including LCD modules and display subsystems. Only 3 or 4 ports are required for the interface between the host controller and the HT1621. The Power Down command can reduce power consumption.

• Operating voltage: 2.4V~5.2V
• Built-in 256kHz RC oscillator
• External 32.768kHz crystal or 256kHz clock input
• 1/2 or 1/3 bias, 1/2, 1/3, or 1/4 duty cycle
• Internal Time base frequency source
• Two buzzer frequencies selectable (2kHz/4kHz)
• Power down command for reduced power consumption
• Internal Time base and WDT watchdog circuit
• Time base/WDT overflow output
• 8 Time base/WDT clock sources, 32×4 LCD driver
• 32×4-bit display RAM
• 3-wire serial interface
• Internal LCD drive frequency
• Software configurable
• Data mode and command mode instructions
• R/W address auto-increment
• Three data access modes
• LCD voltage adjustment via VLCD pin