TLC5941 driver chip

The TLC5941 chip is a TI (Texas Instruments) company with point correction and high gray level (PWM control). All internal data registers, grayscale registers, dot correction registers and error status information of TLC5941 are accessed through the serial interface. The maximum serial clock frequency is 30MHz. The inter-chip current error is generally within ±6%. The current error between bits is generally ± Within 4%, the maximum output current per channel is 80mA.

Each channel of TLC5941 can be used in 4096-level gray scale control according to the value of the internal gray register. The register is 12-bit. Each channel LED drive circuit is controlled by the value of 6-bit correction register for 64 levels, and the drive current The maximum value can be set by the off-chip resistor. 64-level current control provides LED point gamma correction, and 4096 grayscale adjustment ensures that each point in the dot has up to 256 levels of gray representation even at lower gray levels. Red, green and blue full color screens can have 16M color color expression ability. These two points are especially important for high quality color large screen display. Compared with traditional color large screen display system, centralized PWM generation for gray scale control, programmable logic The chip (or high-speed CPU only needs to process the buffer management, grayscale and point correction data output, the design complexity is reduced, and since the PWM gray control is independent of the data serial shift, it is convenient to obtain a higher frame rate, which is very Good dynamic display.

In order to ensure the reliable operation of the color large screen, TLC5941 provides each LED open circuit and over temperature detection capability, built-in open collector output circuit for alarm when error occurs. No matter which channel of the 16 channels has an error, the output pin of the built-in open collector output circuit will be pulled low. By querying the internal status information of the chip, you can know which way is faulty. All TLC5941 in the system. The output pins of the built-in open collector output circuit can be connected together and connected to a high level through a pull-up resistor. By monitoring this signal, the system can self-diagnose during operation. TLC5941 is suitable for occasions where the working environment is harsh and the display effect is very high and the safety performance is very high, such as LED information signs for highways, large-scale open-air LED TVs, etc.

MBI5028 driver chip

MBI5028 Taiwan MBI Accumulation Technology) introduced a LED screen driver chip with programmable current gain function. Built-in serial-to-parallel shift register and output latch with PrecisiONDr technology for better electrical characteristics. The maximum serial clock frequency of MBl5028 is 25MHz. The current error between chips is generally within ±6%. The current error between bits is generally within ±3%, and the maximum output current is 90mA.

MBI5028 built-in current gain control logic unit, programmable current gain function uses Share-IO technology, no need to add extra pins, just enter a specific sequence signal in the corresponding pin, you can enter MBI5028 special function mode -- Current adjustment mode. In this mode, the data of different current gains can be written to the current gain control logic unit through the system microcontroller, the data is latched, and the current output is effectively controlled by a built-in digital and analog shared converter. Due to changes in the working environment and aging of the LED screen, the brightness of the LED screen will be reduced. For example, with a fixed forward current, the brightness deviation of the LED screen will be small. With programmable current gain and PrecisionDr technology, the current deviation can be adjusted to compensate for the brightness of the LED screen while achieving a higher quality image. Using the PrecisionDr technology and built-in digital and analog shared converters, the same accuracy can be achieved by changing the digital code to obtain the relative output current, thereby improving the imaging quality of the LED screen.

Current technology can provide 256 output current levels for LED displays . In terms of electrical characteristics and chip package, the MBI5026 has better compatibility. Users can obtain the current gain technology with Share-IO technology without changing the PCB board designed for the same type of chip, which can greatly reduce the upgrade cost. MBI5026 is suitable for low-end screens such as large indoor LED display screens, which are not demanding in working environment, but require high-quality imaging. At the same time MBI5028 is also suitable for the upgrade of the old driver chip.

ST2221C driver chip

ST2221C China Taiwan SITI point crystal technology company launched an LED screen driver chip. The built-in serial-to-parallel shift register unit, output latch unit and current output control unit have excellent electrical characteristics. ST2221C maximum serial clock frequency is 25MHz, inter-chip current error is generally within ±10%, current error between bits is generally within ±6%, maximum output current is 120mA ST2221C contains 16-channel constant current drive unit, can drive 16 channels simultaneously LEDs are suitable for some low-end screen drivers, such as low-end LED displays such as indoor information screens.

summary

From the above introduction, the current mainstream chips are mainly divided into three grades. The first grade is a chip with a gray scale mechanism. This type of chip has a PWM function inside, which can generate gray scale according to the input data, and is more likely to form deep gray scales and display high quality images. The second grade is a chip with output open-circuit detection, temperature over-temperature protection, and brightness adjustment. These chips are more suitable for specific occasions due to additional functions. For variable information boards, the chip is required to detect LED errors. Features. The third file is a constant current source chip without any additional functions. This type of chip only provides a constant current source for the LED, ensuring good display quality of the screen.

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August 07, 2019