IDCHIP HT1621B

HT1621B is a peripheral device for expanding microcontroller I/O ports. It features a 32×4 display matrix, providing a 128-point memory-mapped, multi-function LCD driver circuit. The device's software features make it well-suited for LCD applications, including LCD modules and display subsystems. The interface to the host controller requires only 3 or 4 ports. A power-down command is available to reduce power consumption.

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