MAX7315AEE+

Overview

The MAX7315AEE+ is an I2C/SMBus-compatible 8-port I/O expander with integrated LED intensity control and interrupt capabilities. It operates on a supply voltage of 2V to 3.6V, while its open-drain outputs support external loads up to 5.5V at 50mA maximum sink current. The device features 400kbps serial communication, transition detection for inputs, and PWM-based LED blinking with global and individual intensity steps. It supports hot insertion and maintains high-impedance states during power-down. The component is housed in a 16-pin QSOP package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrated 8-bit PWM control for LED intensity adjustment with global and individual settings
• Transition detection capability that triggers an interrupt output upon input logic changes
• Hot-insertion protection ensuring pins remain high impedance during power-up sequences
• Configurable ninth port serving as either an interrupt output or general-purpose output

Applications

• LCD backlighting systems requiring intensity control
• LED status indication in portable electronic devices
• Keypad backlights for mobile phones and laptop computers
• RGB LED driver circuits in consumer electronics

Procurement Notes

Verify the suffix 'AEE+' corresponds to the 16-pin QSOP package variant when sourcing. Confirm RoHS compliance through official manufacturer documentation. Ensure the ordering code matches the specific temperature range and pin configuration required for your design implementation.

Selection Notes

Select this component when an I2C interface is required for expanding GPIO lines with independent LED drive capabilities. Consider the 50mA per-port sink rating for direct LED connection without external transistors. Evaluate the 5.5V tolerant outputs if interfacing with higher voltage logic domains than the core supply.

Part Context

This part belongs to the MAX7315 family of I/O expanders from Analog Devices/Maxim Integrated. It provides software and pin compatibility with PCA9534 and PCA9554(A) devices, facilitating direct replacements in existing designs. The series focuses on low-power operation and compact packaging solutions for space-constrained applications.

Replacement Considerations

The MAX7315 is pin and software compatible with the PCA9534 and PCA9554(A). Verify electrical specifications such as operating voltage ranges and output current ratings before substituting these alternative parts in existing circuit designs.

FAQ

How does the MAX7315 handle hot insertion?

All port pins, the INT output, SDA, SCL, and address inputs remain high impedance when V+ is 0V, allowing them to withstand up to 6V asserted upon them during hot insertion events.

What is the maximum current each output port can sink?

Each of the eight I/O ports (P0–P7) can individually sink up to 50mA when connected to an external supply rated at 5.5V.

Can the INT/O8 pin be used as a regular output?

Yes, the INT/O8 pin can be configured as a general-purpose output using the configuration register, providing the same blink and PWM intensity control capabilities as the other eight ports.