MAX6946 Datasheet | Maxim Integrated

Description The MAX6946/MAX6947 I2C- -/SMBus TM-patible, serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V. Each port can be configured as a 2.5m A to 20m A constant-current LED driver (static or PWM), a 1.25m A to 10m A constant-current LED driver (static or PWM), an open-drain logic output, or an overvoltage-protected Schmitt logic input. Analog and switching LED intensity control includes indi.. vidual 8-bit PWM control per output, individual 1-bit analog current control (half/full scale) per output, and a global 3-bit DAC current control that applies to all LED outputs. The MAX6946/MAX6947 can stagger the PWM timing of the 10-port 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. For a similar part with a SPITM-/QSPITM-/ or MICROWIRETMpatible interface, refer to the MAX6966/MAX6967 data sheet. Features - 400kb, 6V-Tolerant Serial Interface - 2.25V to 3.6V Operation - I/O Ports Default to High Impedance (LEDs Off) on Power-Up - I/O Port Inputs Are Overvoltage Protected to 7V - I/O Port Outputs Are 7V-Rated Open-Drain, 10m A or 20m A Constant-Current Static/PWM LED Drivers, or Open-Drain Logic Outputs - I/O Ports Support Hot Insertion - Individual 8-Bit PWM Intensity Control for Each LED - RST Input Clears Serial Interface and Can Exit Shutdown (Warm Start) - MAX6946 OSC Input Allows for External PWM Clock Input - MAX6947 AD0 Input Selects from Four Slave Addresses - Auto Ramp-Up Out of Shutdown and Up to 4s Hold-Off Before Ramp-Down into Shutdown - 0.8µA (typ) Shutdown Current - -40°C to +125°C Temperature Range I2C-/SMBus-patible MAX6946/MAX6947 Applications Cellular Phones Portable Equipment RGB LED Drivers LCD Backlights Keypad Backlights LED Status Indicators Ordering Information PART PIN-PACKAGE 16 TQFN-EP- - 16 TQFN-EP- - TOP MARK ACF ACG PKG CODE T1633-4 T1633-4 Typical...