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1. General  Description

The UST1621 is a 56 pattern, memory mapping, and multi-function LCD driver. The  S/W configuration feature of the UST1621 makes it suitable for multiple LCD applications including LCD modules and display subsystems.Only three or four lines are required for the interface between the host controller and the UST1621. The UST1621 contains a power down command to reduce power consumption.

2. Features
3. Operating voltage : 2.4V~5.2V
   Ø Built-in 256kHz RC oscillator
   Ø External 32.768kHz crystal or 256kHz frequency source input
   Ø Selection of 1/2 or 1/3 bias, and selection of 1/2 or 1/3 or 1/4 duty LCD applications
   Ø Internal time base frequency sources
   Ø Two selectable buzzer frequencies(2kHz/4kHz)
   Ø Power down command reduces power consumption
   Ø Built-in time base generator and WDT
   Ø Time base or WDT overflow output
   Ø 8 kinds of time base/WDT clock sources
   Ø 14 × 4 LCD driver
   Ø Built-in 32 × 4 bit display RAM
   Ø3-wire serial interface
   Ø Internal LCD driving frequency source
   Ø Software configuration feature
   Ø Data mode and command modeinstructions
   Ø R/W address auto increment
   ØThree data accessing modes
   Ø VLCD pin for adjusting LCD operating voltage

 

3. Block Diagram

Notes:
CS: Chip selection
WR, RD, DATA: Serial interface
COM0~COM3, SEG7~SEG31: LCD outputs
IRQ: Time base or WDT overflow output

4. Pin Assignment