Outputs are also staggered, Green by 80ns and Blue by 160ns. Again rather vague but the split to 4 likely is related to the 8KHz internal refresh oscillator. The 16 is split into 4 pieces of 4 within the PWM time period. A bit difficult to determine but it appears that is a command value of 16 of the possible 0 to 255 binary. The GS8208 documentation example uses a LED turned ON 16. OK, what exactly is MPWM? As used in the GS8208 it is Multiple Pulse Width Modulation. For Yellow, S1 and S2 would be MPWM-ed open according to the commanded intensity and S3 and S4 would be closed. One of the graphics shows Red ON and the switch positions can be seen. When any color or colors are ON, S4 is closed and a combination of S1, S2, and/or S3 is PWM-ed open (actually MPWM-ed). My bet is probably closed but the IC documentation does not indicate. With S4 open, the other switches become 'don't care'. To help explain, for all colors OFF, S4 is open and S1, S2, and/or S3 can be either open or closed. I believe this new 12V smart pixel really offers a better choice.Īs David mentioned the LEDs are in series. So the power supply can be placed further away from the LED, which is convenient for installation. Generally speaking, the new 12V smart pixel have nothing to do with voltage drop over distance if you have a long distance string. The data transmission also adopts the redundant data transmission mode or DMX512 mode. It was found that these new 12V smart pixel have made a lot of improvement compared with the traditional products. We compare all these smart pixels in the following data. When the light is white, the power efficiency is even higher than 5V smart pixels. In normal operation, the current of 12V structure is always 18mA, so there is no heating problem. This new 12V smart pixel connects RGB in series, and controls the LED on and off by the switch in parallel. If the LED is off, S4 is disconnected and there is no current in the circuit. The current flows from red light to green light to blue light and then flows through S4. When the LED is fully on, S1 / S2 / S3 is disconnected and S4 is closed.
Smart pixel lights series#
The current is only 18mA.įor this series LED structure, when only one light is on, such as red light, S1 is disconnected, S2 / S3 / S4 is closed, current flows from red light to S2 / S3 / S4, green light and blue light are turn off. Three LED RGB are connected in series with 12V power source. Different from the 5V one, the new 12V smart pixel adopt series LED structure. We have tried to analyze the control mode of the new 12V smart pixel. The new 12V smart pixels is uniform brightness with more pixels in a string.ĭifferent structure comparison of two kinds of 12V smart pixels drive When working under 12V source, the LED current is only 18mA. They adopt current mode LED control and do not use resistance voltage divider. It should be only a temporary scheme.Īt present, there are some new 12V smart pixel on the market. So the brightness of LED will inevitably decline since it adopt voltage control mode. The LED drive current change with VCC voltage for voltage control mode. We can find the difference between voltage mode and current mode. 12V+R smart pixels can run more pixels together in a string without having to worry about voltage drop. The power dissipation is more than 5V smart pixels. It is a bad idea to step down voltage from 12V source to 5V using resistor because the resistors will most likely burn up. Therefore, a 12V + resistance smart pixels has been adopted. They can’t travel longer distance without further power requirements. It seems so interestingĥV smart pixels aren’t a good idea because they are non-uniform brightness. Hey guys, I found a new kind of pixel-GS8208, and I do some test on it.