mb_olre16
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mb_olre16 [2016/09/24 06:21] antichambre [Data Transfer] |
mb_olre16 [2016/09/25 07:53] antichambre [GrayScale Clock] |
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| We expect 16 RGB LED rings encoders. So let's do the math : | We expect 16 RGB LED rings encoders. So let's do the math : | ||
| **16 Encoders * 32 LEDs * 3 colors = __1536 lines__ ** \\ | **16 Encoders * 32 LEDs * 3 colors = __1536 lines__ ** \\ | ||
| - | Let's transpose this to a classical matrixed SRIO chain design: | + | Let's transpose this to a classical matrixed SRIO chain design: \\ |
| - | **3x16=48 inputs + 32 outputs = __6*DIN + 4*DOUT__ **\\ | + | ** 16 * 3 (cathodes) * 32 (anodes)** \\ |
| + | **= 48 inputs + 32 outputs ** \\ | ||
| + | **= __6*DIN + 4*DOUT__ **\\ | ||
| ==== Core-External Driving Concept : TLC5958 ==== | ==== Core-External Driving Concept : TLC5958 ==== | ||
| - | In theory it's possible to drive such a SRIO setup but in fact buses and resistors/R networs are very hard to place and will consume a lot of process. \\ | + | In theory it's possible to drive such a SRIO setup but in fact buses and resistors/R networks are very hard to place and it will consume a lot of contant refresh process. \\ |
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| After a look on the different brands and models of LED driver IC **[[http://www.ti.com/product/TLC5958|Texas Instruments TLC5958]]** appeared as a good compromise to drive a lot of RGB LEDs without overloading the core. Designed to be a LED Display driver, its original purpose and features would allow large-sized RGB-LED-based display setups\\ | After a look on the different brands and models of LED driver IC **[[http://www.ti.com/product/TLC5958|Texas Instruments TLC5958]]** appeared as a good compromise to drive a lot of RGB LEDs without overloading the core. Designed to be a LED Display driver, its original purpose and features would allow large-sized RGB-LED-based display setups\\ | ||
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| CORE provides a regular Clock with PWM @2MHz .The 12bit counter U16 counts until 257 and trigs U1 wich is a monostable, U1 switchs, resets the counter and stops the clock counter input by U17(D-Flipflop). \\ | CORE provides a regular Clock with PWM @2MHz .The 12bit counter U16 counts until 257 and trigs U1 wich is a monostable, U1 switchs, resets the counter and stops the clock counter input by U17(D-Flipflop). \\ | ||
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| - | After a certain time given by the RC couple on U1, U1 switch back and restarts the counter. | + | After a certain time given by the RC couple on U1, U1 switchs back and restarts the counter. |
| By this way we are sure to count the exact 257 Clocks needed and the interval between 2 segments is fixed by the trimpot U19.\\ | By this way we are sure to count the exact 257 Clocks needed and the interval between 2 segments is fixed by the trimpot U19.\\ | ||
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mb_olre16.txt · Last modified: 2019/04/21 08:50 by antichambre
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