Hello,
I need some clarification about the CFAG14432 144x32 displays:
1. Looking on the ST7920 data sheet the VDD is : 2.7V to 5.5V, but CFAG14432D-YYH-TT data sheet (page 5) states:
Supply Voltage For Logic VDD-VSS - 4.5 to 5.5 V
The question is: may I use the CFAG14432 display with 3.3 Vdd for logic supply?
2. If I order LCD for serial interface will "PSB" signal already set correctly (with pull down ressitors) or it is user responsebility to do it? If it is user responsebility where I can find instructions which resistor has to be populated on the back side of the LCD?
3. According to CFAG14432D-YYH-TT data sheet (page 7) the pin 3 designated as (Vo) is Supply voltage for LCD, but on page 8 on the block diagram it is shown as output. From the other hand the data sheet for ST7920 on page 47 (reference design) does not use this pin. Please clarify:
Is VO not an output?
Does the contrast pot connect to VDD and VSS with the wiper going to VO?
Thanks.
I need some clarification about the CFAG14432 144x32 displays:
1. Looking on the ST7920 data sheet the VDD is : 2.7V to 5.5V, but CFAG14432D-YYH-TT data sheet (page 5) states:
Supply Voltage For Logic VDD-VSS - 4.5 to 5.5 V
The question is: may I use the CFAG14432 display with 3.3 Vdd for logic supply?
2. If I order LCD for serial interface will "PSB" signal already set correctly (with pull down ressitors) or it is user responsebility to do it? If it is user responsebility where I can find instructions which resistor has to be populated on the back side of the LCD?
3. According to CFAG14432D-YYH-TT data sheet (page 7) the pin 3 designated as (Vo) is Supply voltage for LCD, but on page 8 on the block diagram it is shown as output. From the other hand the data sheet for ST7920 on page 47 (reference design) does not use this pin. Please clarify:
Is VO not an output?
Does the contrast pot connect to VDD and VSS with the wiper going to VO?
Thanks.
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