Analog Devices Inc./Maxim Integrated MAX7360EWX+T

Overview

MAX7360EWX+T from Maxim Integrated is an I²C-interfaced key-switch controller and LED driver IC that manages up to 64 metallic or resistive key switches (≤5kΩ), provides eight +14V-tolerant open-drain GPIOs with 256-step PWM intensity control, and supports rotary switch input via PORT6/PORT7. It operates from +1.62V to +3.6V, delivers 20mA constant-current sink per port, and features autosleep (1.3µA typ) for portable consumer electronics.

For engineers reviewing the MAX7360EWX+T datasheet, MAX7360EWX+T pinout, MAX7360EWX+T application, or MAX7360EWX+T equivalent, this page delivers verified technical context on static key-scan architecture, FIFO-based key event queuing (16 entries), I²C address selection (4 options), integrated ±8kV/±15kV ESD protection, and WLP package-specific thermal performance (θJA = 46°C/W).

Technical Context

The MAX7360EWX+T implements static matrix scanning-key inputs are monitored without dynamic column/row toggling-to minimize EMI and enable routing near noise-sensitive circuitry. Its internal 128kHz oscillator feeds a 64kHz key-scan clock and 500Hz PWM base frequency, enabling precise debounce (9–40ms user-configurable) and autorepeat timing.

Key events are debounced and stored in a 16-deep FIFO with status flags; interrupt INTK signals on FIFO level threshold (2–14 entries) or time-based timeout. Eight GPIOs support multiple modes: logic I/O, constant-current LED drive (20mA max), or 2-bit gray-code rotary switch input (PORT6/PORT7), all configurable via dedicated registers (0x40–0x5F).

Key Specifications

Pinout & Package

MAX7360EWX+T is housed in a 36-bump wafer-level package (WLP), measuring 2.6mm × 2.6mm, optimized for ultra-compact portable applications including cell phones and pocket PCs. The exposed bump structure provides low thermal resistance (θJA = 46°C/W) and requires standard reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar key-switch controller and LED driver applications.

Compared with MAX7360EWX+T, the MAX7361EWX+T offers identical functionality in a thermally superior but larger package, while the TCA6424ARGJR lacks integrated key-scan, PWM, and rotary switch support-requiring significant firmware development to replicate core capabilities.

Availability

MAX7360EWX+T is available at Aetrix Electronics and suitable for cell phones, handheld games, PDAs, portable printers, and instrumentation requiring stable component supply across extended temperature (-40°C to +85°C) and long-lifecycle production.

Supply support for MAX7360EWX+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX7360 product line targets portable human-interface subsystems, integrating key-scan, LED drive, and GPIO functions into a single ultra-compact WLP to reduce bill-of-materials and simplify firmware in space-constrained devices.

FAQ

What is the maximum key-switch resistance supported by the MAX7360EWX+T?

The MAX7360EWX+T supports key-switch on-resistances up to 5kΩ, verified across the full operating temperature range (-40°C to +85°C). This specification is guaranteed by design and enables reliable detection of aged or high-resistance mechanical switches without external signal conditioning. The internal current source (35µA typ) ensures sufficient voltage drop across the switch for accurate logic-level sensing under worst-case VCC (1.62V) and temperature conditions.

Does the MAX7360EWX+T require external components for ESD protection on key or LED lines?

No, the MAX7360EWX+T does not require external ESD protection components on key or LED lines. It integrates ±8kV IEC 61000-4-2 contact discharge and ±15kV air-gap discharge protection on all ROW, COL, and PORT pins. This on-die protection has been validated per IEC standards and eliminates the need for discrete TVS diodes or RC filters in most portable consumer designs, reducing BOM count and PCB area.

Can the MAX7360EWX+T drive LEDs directly from a 5V supply?

No, the MAX7360EWX+T cannot drive LEDs directly from a 5V supply. Its PORT pins are +14V tolerant but operate from a VCC supply of +1.62V to +3.6V. LED anodes must be connected to a separate 5V rail (or other higher voltage), while the MAX7360EWX+T sinks current through its open-drain ports. This architecture allows 5V LED operation while keeping the IC's logic domain at 1.8V/2.5V/3.3V, preserving compatibility with modern low-voltage MCUs.

How does the MAX7360EWX+T handle rotary switch inputs?

The MAX7360EWX+T uses PORT6 and PORT7 as a dedicated 2-bit gray-code rotary switch input pair. When enabled via GPIO global configuration register (0x40, bit D7), these pins decode direction and step count, storing rotation events in register 0x4A. Interrupt INTI can be configured to signal rotation, eliminating MCU polling. The hardware gray-code interpretation prevents false counts due to contact bounce, and the 16-step counter roll-over simplifies position tracking in menu navigation systems.

What is the minimum sleep-mode supply current for the MAX7360EWX+T?

The minimum sleep-mode supply current for the MAX7360EWX+T is 1.3µA (typical), measured at VCC = +3.3V and TA = +25°C. This ultra-low quiescent current is achieved by disabling key-scan current sources and oscillator circuits while retaining FIFO contents and register state. The value is specified over the full -40°C to +85°C range, with a maximum of 3µA, making it suitable for battery-backed applications where multi-year standby life is critical.