MAX7314ATG+

Overview

The MAX7314ATG+ is an I2C-compatible serial peripheral providing 16 configurable I/O ports plus one output-only port. It operates on a 2V to 3.6V supply with outputs rated at 50mA and 5.5V tolerance. The device features 8-bit PWM LED intensity control, including global and individual settings, and supports two-phase LED blinking. It includes transition detection with interrupt output and hot-insertion protection. Operating current is typically 1.2µA in standby. The component functions within a -40°C to +125°C temperature range and utilizes a 4mm x 4mm Thin QFN package.

Feature Summary

• Provides 18 total ports (16 I/O and 1 output) with open-drain outputs capable of sinking up to 50mA.
• Integrates 8-bit PWM intensity control allowing for global or individual LED brightness adjustment.
• Supports hot insertion with high-impedance state during power-down conditions.
• Includes transition detection logic that triggers an interrupt signal upon input state changes.

Applications

• LCD Backlight Control
• LED Status Indication Systems
• Relay Driver Circuits
• Keypad Backlighting
• RGB LED Drivers

Procurement Notes

Verify the specific ordering suffix ATG corresponds to the 24-pin Thin QFN package variant. Confirm compliance with RoHS standards as indicated by the plus sign. Ensure the intended application voltage falls within the specified 2V to 3.6V operational range. Check for availability of evaluation kits if hardware validation is required prior to production deployment.

Selection Notes

Select this component when a microprocessor requires expanded GPIO capabilities via a standard I2C interface. It is suitable for applications needing direct LED driving without external transistors due to its 50mA sink capability. Consider the 5.5V tolerant inputs if interfacing with higher voltage logic levels while maintaining a lower core supply voltage. The integrated PWM functionality simplifies software design for lighting effects.

Part Context

The MAX7314 belongs to Maxim Integrated's family of serially controlled GPIO peripherals. It is designed to reduce pin count on host microcontrollers by multiplexing multiple I/O functions over a two-wire bus. The device complements other system controllers by handling peripheral tasks such as status indication and keypad scanning independently.

Replacement Considerations

Direct functional replacements include the MAX7314AEG in a QSOP package. Verify pin compatibility and register mapping before substituting different package types. Cross-reference with other Maxim GPIO expanders if I2C address constraints or additional port counts are required.

FAQ

How many unique I2C addresses can be configured?

Four unique addresses are possible by connecting the AD0 pin to GND, V+, SDA, or SCL.

What is the maximum voltage allowed on the I/O pins?

The I/O ports P0–P15 are overvoltage protected up to 5.5V, independent of the V+ supply voltage.

Can the INT/O16 pin function as a general-purpose output?

Yes, the INT/O16 pin can be configured as either an interrupt output or a general-purpose output with blink and PWM control.