Analog Devices Inc./Maxim Integrated MAX7347ATE+TG104

Overview

The MAX7347ATE+TG104 from Maxim Integrated is a 16-pin TQFN-packaged I²C key-switch and sounder controller that monitors up to 24 metallic or resistive (≤1kΩ) keys using static matrix scanning, features an 8-deep debounced FIFO with user-configurable 9ms–40ms debounce time, supports autorepeat, and delivers programmable piezo sounder output for key-click feedback in medical instrument front panels.

For engineers reviewing the MAX7347ATE+TG104 datasheet, MAX7347ATE+TG104 pinout, MAX7347ATE+TG104 application, or MAX7347ATE+TG104 equivalent, this device is selected for low-EMI human-interface designs requiring integrated key-scan logic, interrupt-driven event reporting, and audible feedback generation without external tone circuitry.

Technical Context

The MAX7347ATE+TG104 implements static key-matrix monitoring-no dynamic scanning-to minimize EMI emissions and simplify PCB routing near sensitive analog sections. Its I²C interface operates at up to 400kbps with 5.5V-tolerant pins, bus timeout (20–68ms), and four selectable slave addresses via AD0 pin configuration.

It integrates a dedicated sounder controller with 14 programmable musical frequencies (523.25Hz–2637Hz), push-pull SOUNDER output capable of driving piezo transducers or relays, and configurable sound duration (15.625ms–1s in binary steps). The INT pin functions as either active-low interrupt or open-drain GPO.

Key Specifications

Pinout & Package

MAX7347ATE+TG104 is housed in a 16-pin TQFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally connected to GND. The package supports high-density layout and efficient heat dissipation in compact industrial and medical enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar key-scan and audio feedback applications.

Compared with MAX7347AEE+ and TCA6424A, the MAX7347ATE+TG104 uniquely combines hardware-accelerated key scanning, 8-event FIFO, and integrated piezo sounder control in a thermally enhanced TQFN package-reducing firmware complexity and component count where audible feedback and EMI-sensitive operation are critical.

Availability

MAX7347ATE+TG104 is available at Aetrix Electronics and suitable for medical instrumentation, industrial control panels, security access systems, and portable diagnostic devices requiring stable component supply across extended temperature ranges.

Supply support for MAX7347ATE+TG104 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, medical, and automotive applications.

The MAX7347ATE+TG104 belongs to Maxim's key-scan and human-interface controller product line, engineered specifically for low-EMI, firmware-light front-panel interfaces in safety-critical and noise-sensitive systems.

FAQ

What is the maximum number of keys supported by the MAX7347ATE+TG104?

The MAX7347ATE+TG104 supports up to 24 key switches in a static matrix configuration. This is fixed for the MAX7347 variant-unlike the MAX7348 (40 keys) or MAX7349 (64 keys). Key inputs are monitored without dynamic scanning, ensuring low EMI and deterministic timing. The MAX7347ATE+TG104 achieves this using eight ROW inputs and three COL outputs (COL0, COL1, COL2/PORT2), forming a 8×3 matrix.

Does the MAX7347ATE+TG104 include a built-in sounder driver?

Yes, the MAX7347ATE+TG104 includes a dedicated push-pull SOUNDER output capable of driving piezo transducers, relays, or lamps directly. It supports 14 programmable musical frequencies (523.25Hz–2637Hz), configurable sound duration (15.625ms–1s), and dual-tone or continuous modes. Unlike the MAX7348/MAX7349, the MAX7347ATE+TG104 does not include the full tone generator feature set-but retains core sounder functionality for key-click feedback.

What are the I²C addressing options for the MAX7347ATE+TG104?

The MAX7347ATE+TG104 has a fixed I²C slave address because its AD0 pin is internally tied to GND. Its key-scan controller responds to write address 0x71 and read address 0x70; its sounder controller uses write address 0x73 and read address 0x72. No external AD0 connection is possible-this differs from the MAX7348/MAX7349, which support four address combinations via AD0 routing.

Can the INT pin on the MAX7347ATE+TG104 be used as a general-purpose output?

Yes, the INT pin on the MAX7347ATE+TG104 can be reconfigured as an open-drain general-purpose output (GPO) via the Configuration register (address 0x04). When not used for interrupt signaling, it drives LEDs or other logic-level loads. The pin defaults to interrupt mode at power-up but is fully software-controllable-enabling flexible use in space-constrained designs where pin count is critical.

What is the operating temperature range for the MAX7347ATE+TG104?

The MAX7347ATE+TG104 is rated for continuous operation from -40°C to +125°C. This extended industrial temperature range ensures reliability in harsh environments such as medical imaging equipment enclosures, factory-floor control panels, and outdoor security terminals-where ambient temperatures and self-heating may exceed commercial-grade limits.