MAX7313AEG+T

Overview

The MAX7313AEG+T is a 16-port I/O expander with integrated LED intensity control, interrupt capability, and hot-insertion protection. It features an I2C-compatible serial interface operating at up to 400 kHz. The device supports a supply voltage range of 2V to 3.6V, while its open-drain outputs are rated for external loads up to 5.5V with a maximum sink current of 50mA per port. It includes an 8-bit PWM controller for LED brightness adjustment and two-phase blinking. The component operates within a temperature range of -40°C to +125°C and is housed in a 24-pin QSOP package.

Feature Summary

• Integrated 8-bit PWM control for individual and global LED intensity adjustment
• Supports hot insertion with high-impedance inputs during power-down
• Transition detection with configurable interrupt output
• Two-phase independent LED blinking functionality

Applications

• LCD backlights
• LED status indication
• Portable equipment
• Keypad backlights
• RGB LED drivers

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and compliance status. Ensure that the selected variant matches the required thermal and electrical specifications for the target application environment before finalizing procurement orders.

Selection Notes

Select this component when a microprocessor requires expanded GPIO capabilities via a standard I2C bus. It is suitable for designs needing direct LED driving with programmable brightness and blinking patterns without additional driver ICs. Verify that the system voltage aligns with the 2V to 3.6V supply requirement.

Part Context

The MAX7313 is part of Maxim Integrated's peripheral expansion family, designed to reduce pin count on host processors. It offers pin and software compatibility with other industry-standard expanders, facilitating design reuse across different product lines while providing enhanced LED control features.

Replacement Considerations

The datasheet confirms pin and software compatibility with the MAX7311, PCA9535, and PCA9555. These parts may serve as functional substitutes if they meet the specific voltage and current requirements of the existing circuit design.

FAQ

How many slave addresses can be configured on the MAX7313?

The MAX7313 supports 64 unique I2C slave addresses, determined by the logic levels applied to the AD0, AD1, and AD2 pins.

What is the maximum voltage rating for the I/O ports?

The I/O ports (P0–P15) are rated for an external supply voltage up to 5.5V, allowing them to drive loads connected to higher voltage rails than the device's V+ supply.

Does the device support hot insertion?

Yes, the MAX7313 supports hot insertion. All port pins, the INT output, SDA, SCL, and address inputs remain high impedance when V+ is 0V, even with up to 6V asserted on them.