I/O voltage of 1743

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shibinvarghese
 
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Joined: Fri Aug 27, 2021 5:52 am

I/O voltage of 1743

Post by shibinvarghese »

Hi Team,
I am using 1743 in one of my projects.
I am planning to provide a 5V supply as the input (Vin) directly from a USB.
What is the maximum voltage at the Vin pin?.
Also, what will be the I/O voltage of SPI?.
I am planning to use a 3.3V MCU as the host.
SPI will be the communication protocol od the display module with the host
I am using TSC2004IRTJT to convert the analog youch data to I2C format.
My device is a battery-operated one, so what is the power consumption of the module when working?.
What is the purpose of IM0-3 pins?.
Is there any reference design available for the same?.

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mikeysklar
 
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Re: I/O voltage of 1743

Post by mikeysklar »

Vin max is 5v although if you are using a 3v3 controller I would keep the Vin @ 3v3.

All your SPI will be at 3v3 if that is what your controller is using.

Current draw will be in the 150mA - 200mA range.

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IM3 IM2 IM1 IM0 - these are interface control set pins. In general these breakouts aren't used, and instead the onboard jumpers are used to fix the interface to SPI or 8-bit. However, we break these out for advanced use and also for our test procedures
https://learn.adafruit.com/adafruit-2-8 ... v2/pinouts

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shibinvarghese
 
Posts: 4
Joined: Fri Aug 27, 2021 5:52 am

Re: I/O voltage of 1743

Post by shibinvarghese »

Hi Mikeysklar,
Thank you for your reply.
What is the maximum allowed voltage at the Vin pin?.
Running the module from an LDO or DC to DC converter seems to be an unhealthy option since my device is a battery-operated one.
If my understanding is correct, if I am power the module from 4.2V my input/output logic will be 4.2V, so I will need a level translator.
Also, If I want to use SPI, how to configure the IM3 IM2 IM1 IM0 pins?.

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mikeysklar
 
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Re: I/O voltage of 1743

Post by mikeysklar »

The Vin pin goes through a LP298X regulator which can handle up to 16v (according to that components datasheet), but we clearly print on the Vin pin 3-5v so use that as your guide. If you are going with 3v3 controller logic stay consistent and use that as your Vin.

You solder IM1, IM2 and IM3 closed (not IM0) to use SPI mode.
Before you start, we'll need to tell the display to put us in SPI mode so it will know which pins to listen to. To do that, we have to connect tbe IM1, IM2 and IM3 pins to 3.3V. The easiest way to do that is to solder closed the IMx jumpers on the back of the PCB. Turn over the PCB and find the solder jumpers
adafruit_products_IMjumpers.jpg
With your soldering iron, melt solder to close the three jumpers indicated IM1 IM2 and IM3 (do not solder closed IM0!)
https://learn.adafruit.com/adafruit-2-8 ... s-906160-5

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