Introduction - If you have any usage issues, please Google them yourself
HT1621 Chinese DatasheetHOLTEK HT1621 LCD drive voltage characteristics* 2.4 5.2V* embedded* 256KHz RC oscillator or external 32 kHz chip 256KHz frequency source input* optional 1/2 or 1/3 bias and 1/2 1/3 or 1/4 duty cycle* chip time base frequency sources
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ht1621(ch).pdf