Per cycle tristate capability of NI USB 6343 Card for I2C protocol

[arthur_christ]

Hello,

I have to read temperature from an IC which communicates using I2C protocol. After reading couple of forum discussions I realize that in order to implement I2C protocol one should have  a board with:

1) hardware timed digital IO

2) per cycle tristate capability

Since in I2C protocol both master and slave share the SDA (serial data line), both the above conditions must be met. This protocol demands that we should be able to write data to slave at first clock edge and be able to read data from slave on the very next clock edge. Is it possible to do with NI USB 6343? I mean can we transfer control of SDA from master to slave and vice virsa in one clock cycle? (which I believe is necessary condition for per cycle tristating)

 From specifications of NI USB 6343 card I know 32 DIOs are harware timed. But I dont know if the IOs support per cycle tristating. 

Here is the discussion I read which informs that  although  the card is not ideal for this communication, we still can send and receive data using this protocolhttp://forums.ni.com/t5/Digital-I-O/I2C-Emulation-with-DIO/td-p/2783186.

Can anyone answer to these question:

Can we use NI USB 6343 card for I2C communication?

Does NI USB 6343 card's IO lines support tristate functionality?

Can I use the code wirtten on this link by NI guys for 6343 card? http://www.ni.com/example/31080/en/

[arthur_christ]

Hello,

I have to read temperature from an IC which communicates using I2C protocol. After reading couple of forum discussions I realize that in order to implement I2C protocol one should have  a board with:

1) hardware timed digital IO

2) per cycle tristate capability

Since in I2C protocol both master and slave share the SDA (serial data line), both the above conditions must be met. This protocol demands that we should be able to write data to slave at first clock edge and be able to read data from slave on the very next clock edge. Is it possible to do with NI USB 6343? I mean can we transfer control of SDA from master to slave and vice virsa in one clock cycle? (which I believe is necessary condition for per cycle tristating)

 From specifications of NI USB 6343 card I know 32 DIOs are harware timed. But I dont know if the IOs support per cycle tristating. 

Here is the discussion I read which informs that  although  the card is not ideal for this communication, we still can send and receive data using this protocolhttp://forums.ni.com/t5/Digital-I-O/I2C-Emulation-with-DIO/td-p/2783186.

Can anyone answer to these question:

Can we use NI USB 6343 card for I2C communication?

Does NI USB 6343 card's IO lines support tristate functionality?

Can I use the code wirtten on this link by NI guys for 6343 card? http://www.ni.com/example/31080/en/

[Joachim77]

Hello Arthur,

So first question:

No,  you can't use the USB 6343 card for I2C communication.

The following link shows you, which cards you can use for it:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/202367

Second question:

No, you also can't use it for a tir-state functionalty.

What is Tri-State and which DAQ-Devices support it:

http://digital.ni.com/public.nsf/allkb/09B559BE292C75DB8625698500640E0A

Third question:

Sorry, but no you can't use the code for your card.

Best regards

Joachim