MAX7313ATG+

Overview

The MAX7313ATG+ 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 I/O ports are rated for external loads up to 5.5V with a maximum sink current of 50mA per port. It includes an internal PWM oscillator running at 32 kHz for LED brightness adjustment. The component operates within a temperature range of -40°C to +125°C and is housed in a 24-pin TQFN package.

Feature Summary

• Integrated 8-bit PWM control for LED intensity adjustment with global and individual settings
• Supports hot insertion with high-impedance state during power-down conditions
• Transition detection on input ports triggers interrupt output upon logic level changes
• Two-phase independent blink timing control for each output port

Applications

• LCD backlighting systems
• LED status indication circuits
• Portable equipment power management
• Keypad backlight drivers
• RGB LED driver arrays

Procurement Notes

Verify the specific ordering suffix ATG+ corresponds to the lead-free RoHS-compliant 24-pin TQFN package variant. Confirm that the exposed pad connection requirements align with the thermal design specifications. Ensure the selected distributor provides traceable documentation matching the Maxim Integrated datasheet revision.

Selection Notes

Select this component when a microprocessor requires expanded GPIO capabilities alongside direct LED drive functionality. It is suitable for designs needing transition detection interrupts without external logic. Consider compatibility with PCA9535 or PCA9555 if pin-swapping is required for existing layouts.

Part Context

This device belongs to the MAX7313 family of I/O expanders manufactured by Analog Devices (formerly Maxim Integrated). It serves as a peripheral interface solution for embedded systems requiring multiple open-drain outputs with current-sinking capabilities. The ATG+ designation specifically identifies the industrial temperature grade version in the TQFN form factor.

Replacement Considerations

The MAX7311, PCA9535, and PCA9555 are documented as pin and software compatible alternatives. Verify register mapping and electrical characteristics before substitution to ensure functional equivalence in the target application.