MSP430FR6047: Can we drive 8-Com & 12 SEG LCDs , 1/3 bias using MSP430FR6047 as my microcontroller by capacitor split method , instead of internal or external biasing method?

Rishabh Mishra

Part Number: MSP430FR6047

Tool/software:

I am observing that the current consumption of 8-Com & 12 SEG LCD , 1/3 bias is 5 microA when i am using capacitor split method of RL-78/L12 series microcontroller. But the current consumption of same LCD is 9.6 microA when i am using internal biasing method of MSP430FR6047. The voltage supply was same in both the cases i.e. 3.6 V. I am assuming that this difference in current consumption is due to these methods only. So, can we implement capacitor split method or not, using MSPFR6047 as my microcontroller. If i can implement this,what should i do?

Is there any other method to drop my LCD current consumption. I have tried to implement external biasing method too , reading from this application note(chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/www.ti.com/.../slaa654a.pdf) . But the LCD segments was not behaving properly,showing ghosting effect.The resistor values were R = 100K and Rx(Contrast Control) = 4.7K. It was also showing the ghosting effect. When i was increasing the values of resistors , the ghosting effect was also increasing.

Waiting for a fruitful response.

Thank You

Rishabh Mishra

7 days ago

0 Diego Abad Sajamin 6 days ago

TI__Expert 4037 points

Hi Rishabh,
Our team will be out of the office until Monday. I'll consult them about this issue by Monday next week. However, I would recommend looking into the SLAA272A App Note since it could contain useful information.
Best Regards,
Diego Abad

0 Rishabh Mishra 6 days ago in reply to Diego Abad Sajamin

Prodigy 100 points

Thanks for the reply.

But want to know about the LCD drive methods i have described above in the question.

Waiting for a fruitful response.

Thank You

Rishabh Mishra

0 Rishabh Mishra 2 days ago in reply to Rishabh Mishra

Prodigy 100 points

Hi Diego,

Any update?

Waiting for a fruitful response.

Thank You

Rishabh Mishra

0 Diego Abad Sajamin 2 days ago in reply to Rishabh Mishra

TI__Expert 4037 points

Hi Rishabh,
There is a team member who is still not here whom I want to consult with before giving you a conclusion. However, so far, my research points to the MSP430FR6047 not supporting the capacitor split method. However, you can attempt it in the FR6047. If so, I recommend analyzing the Capacitor Split Method in the RL-78/L12 user and trying to replicate it in the FR6047 externally.
Best Regards,
Diego Abad

0 Rishabh Mishra 1 day ago in reply to Diego Abad Sajamin

Prodigy 100 points

Hi Diego,

It is not possible to replicate capacitor split method in MSP430Fr6047. Can we do something else , to achieve lower current consumption.

Waiting for a fruitful response .

Thank You

Rishabh Mishra

0 Diego Abad Sajamin 1 day ago in reply to Rishabh Mishra

TI__Expert 4037 points

Hi Rishabh,
The only way I can think of to achieve lower current consumption will be to configure the MCU to a lower power consumption mode or to assign a low-frequency clock source for the LCD module.
Best Regards,
Diego Abad

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MSP430FR6047: Can we drive 8-Com & 12 SEG LCDs , 1/3 bias using MSP430FR6047 as my microcontroller by capacitor split method , instead of internal or external biasing method?