MAX6947ATE+

MAXIM INTEGRATED PRODUCTS  MAX6947ATE+  芯片, 发光二极管驱动器

The is a 10port, constant-current LED driver and I/O expander with PWM intensity control in 16 pin TQFN package. The I2C/SMBus compatible, serial interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V. Each port can be configured as a 2.5mA to 20mA constant current LED driver static or PWM, a 1.25mA to 10mA constant-current LED driver static or PWM, an open-drain logic output or an overvoltage protected Schmitt logic input. Analogue and switching LED intensity control includes individual 8bit PWM control per output, individual 1bit analogue current control half/full scale per output and a global 3bit DAC current control that applies to all LED outputs. The MAX6947 can stagger the PWM timing of the 10port outputs in consecutively phased 45° increments. Staggering the outputs spreads the PWM load currents over time in eight steps, helping to even out the power-supply current and reduce the RMS current.

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Supply voltage range is 2.25V to 3.6V

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Operating temperature range from -40°C to 125°C

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I/O ports default to high impedance on power-up & I/O port inputs are overvoltage protected to 7V

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I/O port o/p are 7V rated open-drain, 10mA/20mA constant current or open-drain logic outputs

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I/O ports support hot insertion

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Individual 8bit PWM intensity control for each LED

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Active low reset input clears serial interface and can exit shutdown Warm Start

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AD0 input selects from two slave addresses

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Auto ramp-up out of shutdown and up to 4s hold off before ramp down into shutdown

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Shutdown current is 0.8µA typ