faizanbrohi Posted September 20, 2006 Report Posted September 20, 2006 I am Planning to build a parallel port led dimmer using ti's TLC5904 which uses 8 data inputs for adjusting the brightness or in other words current . you can control upto 15 LED's using this IC . I know how to interface the parallel port But there is some complication in this is , i don't understand what is a DOUT For , DIN DCLK are used for input for brighness control , and there input will come from a parallel port , since a parallel port is a 8 bit ouput from a computer . i don't know why dclk is for , do i have give external clock pulse . here is the ic pinouttlc5904.pdf Quote
faizanbrohi Posted September 20, 2006 Author Report Posted September 20, 2006 please can anyone help me on this subject Quote
faizanbrohi Posted September 22, 2006 Author Report Posted September 22, 2006 okay 33 pins are NC which are not connected so this leaves only 67 , out of which 16 are output to led which leaves 51 pins out of which 16 are for DIN and DOUT which leaves 35 pins and out of which only 2 pins are for register select for brightness control and DCLK , the only question i want to ask is that the maximum rating of DCLK is 15Mhz and there is no min or typical value given , so since 15Mhz is maximum so i can drive it with a 1Mhz clock refrence using Timer TLC552 . That is the only question please helppp.... Quote
MP Posted September 24, 2006 Report Posted September 24, 2006 The data sheet is here:http://focus.ti.com/lit/ds/symlink/tlc5904.pdfThe answers to your questions are in the datasheet. Dout is described somewhere around page 17.1MHZ clock should be ok. It will just transfer data much slower.MP Quote
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