TXS0108E: Reviwe & Comment my schematics.

Inho Jeon

Expert 1452 points

Part Number: TXS0108E

TXS0108EZXYR_SCH.pdf

Hi All,

I attach a file.

That is schematics ; 5 ports of OLED Display(3.3V I/O) connect to MCU(1.8V I/O) using TXS0108.

Refer Nets of that schematics, below this

+3.2V : 3.2V / 100mA => Power Source of OLED Display

VDD_S : 1.8V/200mA => Power Source of MCU

/OLED_RST' : GPIO port of OLED Display
OLED_SPI_MOSI' :  SPI MOSI port of OLED Display
OLED_SPI_CLK' :  SPI CLK port of OLED Display
OLED_DC' :  GPIO port of OLED Display
OLED_SPI_CS' : SPI CS port of OLED Display

/OLED_RST : GPIO port of MCU
OLED_SPI_MOSI :  SPI MOSI port of MCU
OLED_SPI_CLK :  SPI CLK port of MCU
OLED_DC :  GPIO port of MCU
OLED_SPI_CS : SPI CS port of MCU

Refer parts of that schematics.
CON2 : OLED Display

That is for Wearable Device.

Review my schematics , ASAP.

Best Regards,

Inho Jeon.

over 7 years ago

0 Emrys Maier over 7 years ago

TI__Guru* 97046 points

Hi Inho,
I have notified the appropriate applications specialist. We will get back with you soon.

0 Michael J Schultis over 7 years ago

TI__Mastermind 24975 points

Hello Inho,

The supplies of the device look good, and most of the lines look good, however, your /OLED_RST' line has a large capacitor connected to it.
It is not recommended to use this device to drive large capacitance or lines with a lot of stray capacitance.

Be sure that this device does not have to drive large capacitances as it will not work well and also will affect signal integrity as this device can not drive a large amount of current quickly to charge capacitors.

Let me know if you have any additional questions and I would be happy to help.
Best,
Michael

0 Inho Jeon over 7 years ago in reply to Michael J Schultis

Expert 1452 points

Heoll Michael,

Thank you for your reply.
You mean C41 is too large capacitance, so it will not working well, Is it right?
So, is C41 set to lower capacitance or deleted?

And, In your web page (www.ti.com/.../scea030b.pdf), TXB-series is good to SPI, TXS-series is suitable to I2C.
So, Is TXB-series proper to my schematics?

Please, Inform me that questions, ASAP.

Best Regards,
Inho Jeon.

0 Emrys Maier over 7 years ago in reply to Inho Jeon

TI__Guru* 97046 points

Hi Inho,
I'm going to move all conversation to this thread:
e2e.ti.com/.../2366173

There's no reason to have two threads on the same topic.

Logic

Logic forum

TXS0108E: Reviwe & Comment my schematics.