Valente said:
thanks but i found that before and it dosent realy answer my question it just tells me what features the converter has
Everything you want is in there!
LT is a lamp-test feature, active low. That means this line should be high for normal operation and, when pulled low, all 7-segments will be turned on so you can see all the 'lamps' are still good...
RBI is the ripple blanking input, also active low. It allows you to hide a '0'.
When this line is high, and there's a 0 at the inputs, a '0' will be displayed on the display. When the line is low with a 0 at the inputs, nothing will be displayed. This allows you to hide the leading zero's if, for example' you're displaying a short number on a large display.
(for example, 54 in stead of 00054)
BI/RBO is a wired-and pin, so it can be used as input and output, you should pull it high with a resistor, so the device can pull it low again.
BI is the blanking input, active low. It should be high for normal operation, when pulled low the display will be blank, regardless of whatever data is on the inputs.
When acting as output it becomes RB0 wich is the ripple blanking output. When you use RBI , and a '0' is on the inputs wich gets hidden, then this output becomes low, you can use it to inform the next lesser significant digit.