MSP430FR6989: LCD_C controller: Size of the resistors of the internal voltage divider

Tobias Heindl

Part Number: MSP430FR6989

Hello,

I am currently testing the power consumption of the MSP430FR6989 when driving displays. In doing so, I want to compare an external voltage divider with the internal voltage divider to provide the bias voltage. However, I can't find anywhere a specification how big the resistors of the internal voltage divider are. Can you help me with this issue?

Thank you very much,
Tobias Heindl

7 months ago

0 Eason Zhou 7 months ago

TI__Mastermind 33960 points

You want to ask this resistor value? Can you show me how will you to combine external voltage divider and internal voltage divider.

0 Tobias Heindl 7 months ago in reply to Eason Zhou

Prodigy 30 points

Hi, I don't want to combine them. I want to know the resistor values just as an orientation to compare an external voltage divider with the internal voltage divider. But I do not want to use both at the same time.

0 Eason Zhou 7 months ago in reply to Tobias Heindl

TI__Mastermind 33960 points

The resistor value depends on the LCD load. If you don't care about power consumption, you can use like 10kR as an example.

0 Tobias Heindl 7 months ago in reply to Eason Zhou

Prodigy 30 points

ah ok, so the internal voltage divider has no fixed values, but depends on the used display, right?

+1 Eason Zhou 7 months ago in reply to Tobias Heindl

TI__Mastermind 33960 points

I think internal voltage divier have fixed values. But sorry, I also can't find this information internally. As you are want to use external resistor to make the LCD work properly, I think you can follow my previous suggestion and not refer to the internal resistor values.

0 Tobias Heindl 7 months ago in reply to Eason Zhou

Prodigy 30 points

all right, thanks for your help

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MSP430FR6989: LCD_C controller: Size of the resistors of the internal voltage divider