MAX7311AUG+T

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The MAX7311AUG+T is a versatile I/O expander device which combines an I/O port expander, a I2C-compatible serial interface, and a temperature sensor into one tiny package.

Application Field

The MAX7311AUG+T combines ports, analog-to-digital conversion, intelligent LED drivers and an integrated temperature sensor. This single device result in simplifying the inventory of peripheral components, leading to a faster time to market applications.

The MAX7311AUG+T interface an I2C-based microcontroller (MCU) or an SPI-based microcontroller. It is a very useful application for MCUs with limited I/O or for systems with only a few spare I/Os. It provides a significant number of additional I/Os for these applications.

• Replacing as many as 16 discrete I/O devices with a single device
• Reduced board space and total system cost
• Voltage monitoring
• Provides temperature measurements
• Control of high-current LEDs
• Enhanced systems through the use of an I2C-compatible interface bus

Working Principle

The MAX7311AUG+T integrates several features. It has ports that can be configured as both inputs or outputs and can operate in voltage levels from 5 V to 3.0 V or lower. All 8 ports are open drain, which enable the ports to sink current. The internal operation of the ports consists of resistors, logic gates and buffers.

The port has a programmable buffered input voltage detector. The voltage detector monitors the voltage of any open-drain port, and can be configured from 5 V to 3.0 V or lower in 2 mV increments. It is activated by a write to the configuration register and allowing the microcontroller to monitor user inputs.

Another feature of MAX7311AUG+T is intelligent LED-driving capability. The LED drivers are enabled by writing to the configuration register. They can be configured as sources or sinks and up to 4 levels of current can be programmed.

The internal temperature sensor of the device can measure the die temperature, ambient temperature, or the temperature of remote devices. It can be used to detect high or low temperature levels and the data is stored in the temperature register. The data from the temperature register can be used to provide temperature compensation and to detect over temperature conditions.

In summary, the MAX7311AUG+T provides an easy way to automatically expand the number of I/O’s available for an I2C or SPI-based microcontroller. It incorporates various features, such as an integrated temperature sensor, low voltage level detection, intelligent LED driving capability and open drain ports. It is the perfect device when additional I/Os are needed and can be used in applications such as Apple product manufacturing, HVAC and automotive. In short, it is an ideal low-cost solution to I/O expansion.

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