MAX6946ATE+

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The MAX6946ATE+ is a highly integrated per-channel LED driver for green and red LED displays. It is part of the PMIC - LED Drivers industry family. The MAX6946ATE+ LED Driver provides 32 separate LED channels, divided into 16 channels (group 1) capable of 5mA supply current and 16 channels (group 2) capable of 3mA supply current. It is specifically designed to drive the high-row count LED displays with a small number of pins and stores 16 overlapping PWM levels in 8×8 display grids.

The MAX6946ATE+ offers a highly integrated approach that not only simplifies PC board layout, it also helps to reduce component count and cost. The power supply for this device is 5V and its operating temperature range is -40°C up to +85°C. It is available in a 25-Pin, TQFP-EP package (EP = Exposed Pad).

The device features a built-in temperature sensor and a windowed watch-dog timer for more reliability. It uses a dedicated user-defined duty cycle per row that is variable in a 1 µs to 64 mS range. This improves the driving capability and reduces the power consumption and brightness.
The basic working principle of the MAX6946ATE+ is the same as any other LED driver. It receives clock and input data and converts them into light through its output drivers. The input and output clock signals provide the timing needed for the data to be multiplexed into and out of the device. The input data is used to drive the output drivers, turning on and off individual LEDs.

The windowed watch-dog timer keeps track of the time elapsed between the last two refresh cycles. If the timer reaches its time-out level, the device asserts a timeout signal and disable the outputs, turning off all the LEDs until restarted by an external reset signal. This feature is useful for LED displays when the system is reset or crashed, and it is important that all LEDs are off. Furthermore, the built-in temperature sensor prevents the device from overheating by automatically turning off the outputs when a certain temperature-threshold is exceeded.

The MAX6946ATE+ also features internal display RAM for increased refresh rate, improved display contrast and a feature called "Direct off". This allows the display to turn off even though data and clock are present. This is useful in a bright environment where the user might want to dim the LED display and to turn it on and off without the need of an external control signal.

In conclusion, the MAX6946ATE+ LED Driver is a highly efficient and integrated LED display driver perfect for green and red LED displays. It offers many advantages like reduced component count, improved layout performance, increased brightness, as well as built-in temperature sensing and watchdog timer support. The built-in display RAM allows for increased refresh rate, improved display contrast and "Direct off" operation. All in all, it is an excellent choice for various green and red LED display applications.

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