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MAX7306：SMBus/I²C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers

Low Operating Supply Voltage LED Drivers with Blinking, Transition Detection, and Level Translation in a Very Small Package Ideal for Cellular and Smartphone Applications

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.

Key Features 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

MAX7306, MAX7307: Typical Operating Circuit Applications/Uses Cell Phones LCD/Keypad Backlights LED Status Indicators System I/O Ports

DataSheet

Parametrics

Design kits & evaluation modules

• MAX7306EVCMAXQU
• MAX7306EVKIT

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• MAX7301：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
• MAX6957：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander

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