SMBus/I²C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers

The MAX7306/MAX7307 I²C-/SMBus™-compatible, serial-interfaced peripherals feature four level-translating I/Os and operate from a 1.62V to 3.6V power supply. The MAX7307 features a port supply (VLA) that allows level translation on I/O ports to operate from a separate power supply from 1.4V to 5.5V. The MAX7306 features an address select input (AD0) to allow up to four unique slave addresses.

The MAX7306/MAX7307 ports P2, P3, and P4 can be configured as inputs, push-pull outputs, and open-drain outputs. Port P1 can be configured as a general-purpose input, open-drain output, or an open-drain active-low INT output. Ports P2 and P3 can be configured as OSCIN and OSCOUT, respectively. The MAX7306/MAX7307 include an internal oscillator for PWM, blink, and key debounce, or to cascade multiple MAX7306/MAX7307s. The external clock can be used to set a specific PWM and blink timing. The active-low RST input asynchronously clears the 2-wire interface and terminates a bus lockup involving the MAX7306/MAX7307.

All ports configured as output feature 33-step PWM, allowing any output to be set from fully off, 1/32 to 31/32 duty cycle, to fully on. All output ports also feature LED blink control, allowing blink periods of 1/8 second, 1/4 second, 1/2 second, 1, 2, 4, or 8 seconds. Any port can blink during this period with a 1/16 to 15/16 duty cycle.

The MAX7306/MAX7307 are specified over the -40°C to +125°C temperature range and are available in 10-pin µDFN (2mm x 2mm) and 10-pin µMAX® packages.

Applications

* Cell Phones * LCD/Keypad Backlights * LED Status Indicators * System I/O Ports

* 1.4V to 5.5V I/O Level Translation Port Supply (VLA)

* 1.62V to 3.6V Power Supply

* Four Individually Configurable GPIO Ports

* P1 = Open-Drain I/O

* P2, P3, P4 = Push-Pull or Open-Drain I/O

* Individual 33-Step PWM Intensity Control

* Blink Controls with 15 Steps on Outputs

* 1kHz PWM Period Provides Flicker-Free LED Intensity Control

* 25mA (max) Port Output Sink Current (100mA max Ground Current)

* Inputs Overvoltage Protected Up to 5.5V (VLA)

* Transition Detection with Optional Interrupt Output

* Optional Input Debouncing

* Active-Low RST Input Clears Serial Interface, Can Restore Power-Up Default State, and Synchronizes Blink Timing

* Oscillator Input and Output Enables Cascading Multiple Devices

* Low 0.75µA (typ) Standby Current