BB expansion header- Level Shifter

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1

Dear Friends,

I am looking for a bi-directional level shifter (1.8 V to 3.3 V) for
SPI communication at BB expansion header. The ADC we are working with
is ADS1258 EVM (working with 3.3 V)

I am thinking to buy http://focus.ti.com/docs/prod/folders/print/txb0108.html

Does any body suggest other product or IC concerning this issue?

Thanks a lot,
Kunal

2

The TXS0108 series should be fine. There is also a TXB0108 that has different pullup configurations and may or may not be better suited for your specific application. It really depends on whether you need an external pullup or not. These are used on the Beagle for the I2C level shifting.

Gerald

3

Hi, TinCanTool uses 74AVC4T774 for level shifting on their Zippy.

4

Thanks Gerald.

TXB0108 : 8-Bit Bidirectional Voltage-Level Translator with Auto
Direction Sensing and +/-15-kV ESD Protect
TXS0108 : 8-Bit Bidirectional Voltage-Level Translator For Open-Drain
And Push-Pull Application

You have recommended TXS0108.

But isn't TXB0108 Auto direction sensing useful here ?

Kunal

5

From: beagleboard@googlegroups.com
[mailto:beagleboard@googlegroups.com] On Behalf Of kunal mankodiya
Sent: Saturday, October 24, 2009 4:36 AM
To: Beagle Board
Subject: [beagleboard] BB expansion header- Level Shifter

Dear Friends,

I am looking for a bi-directional level shifter (1.8 V to 3.3 V) for
SPI communication at BB expansion header. The ADC we are working with
is ADS1258 EVM (working with 3.3 V)

I am thinking to buy

I use TXS0108 for SPI level translation.

6

Thanks Guys. I ordered TXB0108.

7

From: beagleboard@googlegroups.com
[mailto:beagleboard@googlegroups.com] On Behalf Of kunal mankodiya
Sent: Saturday, October 24, 2009 8:30 AM
To: Beagle Board
Subject: [beagleboard] Re: BB expansion header- Level Shifter

Thanks Gerald.

TXB0108 : 8-Bit Bidirectional Voltage-Level Translator with Auto
Direction Sensing and +/-15-kV ESD Protect

Use this if the data direction changes, such as in an I2C bus.

TXS0108 : 8-Bit Bidirectional Voltage-Level Translator For Open-Drain

Use this one for SPI since the direction of the signals are fixed. MOSI, CLK
& CS are all outputs from OMAP and MISO is an input.

And Push-Pull Application

You have recommended TXS0108.

But isn't TXB0108 Auto direction sensing useful here ?

Kunal

> The TXS0108 series should be fine. There is also a TXB0108 that has
> different pullup configurations and may or may not be better suited for

your

8

TXS0108E = ST2378E (the same functionality but slower)

9

We are using MAX3378 (Maxim product), it’s work very well for GPIO, UART, SPI (tested), and I²C (not tested)

2009/10/25 Robert Konieczny <rob.konieczny@googlemail.com>