TXB0108: TXB0108 does not work. At the output of 1.6V

Oleg Perevyshin

Prodigy 30 points

Part Number: TXB0108
Other Parts Discussed in Thread: CC1101

Hello!
The converter does not work. At the output of 1.6V.

When transferring data, there is no conversion and the signal is very strange.

What is the problem? Conversion should be 3.3-5V

over 6 years ago

0 Karan Kotadia over 6 years ago

TI__Genius 16735 points

Hello,

We are looking into this issue. I have asked our translation expert to get you an answer.

Thanks!
-Karan

0 Karan Kotadia over 6 years ago in reply to Karan Kotadia

TI__Genius 16735 points

Hello,

I am going to need a better schematic. What frequency are you operating at? Are you using any external pullups on the device?

Here is an appnote on translating with TXB: cdn-shop.adafruit.com/.../txb0108appnote.pdf

Thanks!
-Karan

0 Oleg Perevyshin over 6 years ago in reply to Karan Kotadia

Prodigy 30 points

Hello!

1. Frequency about 1 MHz

2. A microcontroller (ATmega328) is connected to the converter. External and internal (pullups and pulldowns) are not, MCU side connect:

- CSn connect to PB2 (OC1A/PCINT1)

- GDO2 connect to PD3 (PCINT19/OC2B/INT1)

- SO connect to PB4 (MISO/PCINT4)

- SCK connect to PB5 (SCK/PCINT5)

- SI connect to PB3 (OC2A/MOSI/PCINT3)

I use hardware SPI for CC1101

0 ShreyasRao over 6 years ago in reply to Oleg Perevyshin

TI__Guru 61970 points

Hi Oleg,

I looked into the ATMeg328 data sheet
ww1.microchip.com/.../Atmel-42735-8-bit-AVR-Microcontroller-ATmega328-328P_Summary.pdf
it mentions there are internal pullup resistors on the IO ports. Please confirm if these are activated.

0 Oleg Perevyshin over 6 years ago in reply to ShreyasRao

Prodigy 30 points

It all worked. The reason was that during installation the PCB was bad washed.

The flux was under the chip.

0 ShreyasRao over 6 years ago in reply to Oleg Perevyshin

TI__Guru 61970 points

Thanks for letting know. Glad that it works now.

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TXB0108: TXB0108 does not work. At the output of 1.6V