Junaid Posted May 20, 2005 Report Share Posted May 20, 2005 I am using ICL7109 in a project, but it is not working when ever i give low pulse to LBEN or HBEN it do not convert analog data into digital but it converts all data output bits high i dont know whats going there with it, i think it is damaged can u tell me wot can happned wit it? Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 20, 2005 Report Share Posted May 20, 2005 Hi Junaidno need to use BOLD, can use post a circuit diagramEd Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 Why i cant write in Bold? Any problem? or sum thing.. wrong?? Well i am sending you Schematic... You Hold On please. Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 20, 2005 Report Share Posted May 20, 2005 Hi Junaidit is a convention on the internet that when someone writes with bold lettering it means that he or she is SHOUTING and as you're probably aware most of us react to shouter by ignoring them. You are perfectly free to carry on using bold, no-one will stop you but it severely reduces the chance of having your problems solved.Ed Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 [move]Oki Sir![/move] Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 Check it!... Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 Complete Schematic, please view it!! and tell me wots the problem!! is the schematic right!?? this schematic shows AVR controller but right now i am using 89C51.. Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 I have seen many Application Sheet, just tell me wot does it mean? ICL7109, 12-bit dual-slope converter, +/- 400.0mV 0.1mV resolution, ~12.5 conversions/s wot does +/- 400 mV means and 0.1mV resolution, does it mean you can apply +/-400 mV input signal only? and the step size is 0.1mV or what else? will wait for ur replies of all u peoples.Thanks for listing.. Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 20, 2005 Report Share Posted May 20, 2005 Hi Juaidthe only thing I can see is that you've left pin 17 floating, in its low state all outputs would be set to 1, it's therefore worth tying this input high.EdI'll try to answer the other questions shortly... Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 yes u r right! actully i forgot to put this pin HI in the schematic, but i tied HI in the hardware, i am sending you the detalied pin description please check it!!Thanks for listing.. Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 20, 2005 Report Share Posted May 20, 2005 Hi Junaidbefore going any further, if you haven't already done so, please join the analogue input to GND (ie don't apply any input voltage), this should give a reading of 0000Ed Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 Yeaaa i have also done this!... i applied no voltage at input & by giving LOW pulse at LBEN it tied all pins HIGH from B0 t0 B7..This means, there is no effect of any input..Ok right now the problem is this..When i give Low pulse at LBEN which is low enable it tied all output pins from B0-B7 HighAnd When i give Low pulse at HBEN which is low enable it tied all output pins from B8-B12 High, Yesss it exectly means there is no effect of any input! now wot u say? Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 20, 2005 Report Share Posted May 20, 2005 Hi JunaidI'm trying to understand why all of the outputs are high - with input short circuited, after applying HBEN or LBEN do any of the outputs go low ever? You may may need to split the circuit so that only the ICL7109 is operational, ie, remove digit outputs from the bus and ensure that the 7109 works OK on its own.Ed Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 and this is the 89C51's program which i have written and i am sure the programis absolutely right and the hardware is also right! the problem is that the ICL7109 is damaged >:( cuz when i was setting refrence voltages from pin 39 and pin 36, by mistake the pins 39 and 40 were shorted out by multimeter's probe, and due to this the ICL7109 was heated a little but i am not sure where is the problem ??? ??? Quote Link to comment Share on other sites More sharing options...
Junaid Posted May 20, 2005 Author Report Share Posted May 20, 2005 No!! after Applying HBEN or LBEN non of the output pins goes to low they allways [glow=red,2,300]high![/glow] Quote Link to comment Share on other sites More sharing options...
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