The MAX6947ATE+ 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.
Supply voltage range is 2.25V to 3.6V
Operating temperature range from -40°C to 125°C
I/O ports default to high impedance on power-up & I/O port inputs are overvoltage protected to 7V
I/O port o/p are 7V rated open-drain, 10mA/20mA constant current or open-drain logic outputs
I/O ports support hot insertion
Individual 8bit PWM intensity control for each LED
Active low reset input clears serial interface and can exit shutdown (Warm Start)
AD0 input selects from two slave addresses
Auto ramp-up out of shutdown and up to 4s hold off before ramp down into shutdown
