MAX7315ATE+T

Overview

The MAX7315ATE+T is an I/O expander with integrated LED intensity control, interrupt generation, and hot-insertion protection. It features eight open-drain I/O ports (P0–P7) rated at 50mA sink current and up to 5.5V external supply voltage. A ninth port (INT/O8) serves as an interrupt output or general-purpose output. The device operates on a 2V to 3.6V supply with a maximum clock frequency of 400kHz via an I2C/SMBus interface. Standby current is typically 1.2µA, rising to 14.4µA max when PWM is enabled. It supports 64 selectable slave addresses and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrated 8-bit PWM LED intensity control with global and individual dimming steps
• Automatic two-phase LED blinking capability with independent timing per output
• Hot-insertion support maintaining high-impedance state during power-down
• Transition detection with interrupt output for monitoring input logic changes

Applications

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

Procurement Notes

Verify the component against official Maxim Integrated datasheets to confirm pinout compatibility and electrical specifications. Ensure the ordering suffix matches the required package type and temperature rating. Cross-reference part numbers with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component for applications requiring GPIO expansion alongside direct LED driving capabilities. Verify that the system voltage aligns with the 2V to 3.6V operating range. Confirm that the I2C bus speed requirements do not exceed 400kHz. Evaluate thermal dissipation needs if multiple outputs are simultaneously active near the 50mA limit.

Part Context

The MAX7315 belongs to the MAX7315 series of peripheral interfaces designed for microprocessor systems. It provides a compact solution for expanding I/O lines while managing display elements. The device integrates specific control registers for blink patterns and intensity adjustments, distinguishing it from standard GPIO expanders lacking PWM functionality.

Replacement Considerations

The MAX7315 is pin and software compatible with the PCA9534 and PCA9554(A). These devices can serve as functional substitutes in designs where specific LED intensity control features are not utilized.