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Analog Devices Inc./Maxim Integrated MAX7347ATE+
- Part No.:
- MAX7347ATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX7347ATE+.pdf
- Description:
- IC INTERFACE SPECIALIZED 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
The MAX7347ATE+ from Maxim Integrated is a 2-wire (I²C) interfaced key-switch and sounder controller IC designed for low-EMI static matrix scanning of up to 24 metallic or resistive switches (≤1kΩ), with integrated 8-deep FIFO debouncing, user-configurable 9ms–40ms debounce time, and programmable autorepeat. It operates from 2.4V to 3.6V over –40°C to +125°C and features a push-pull SOUNDER output capable of driving piezo transducers or relays - used in medical instrument front panels requiring tactile feedback and noise immunity.
For engineers reviewing the MAX7347ATE+ datasheet, MAX7347ATE+ pinout, MAX7347ATE+ application, or MAX7347ATE+ equivalent, this page delivers verified technical context, exact pin functions for TQFN-EP package, real-world I²C timing compliance (400kbps, 5.5V-tolerant), sounder frequency accuracy (±1.2%), and validated alternatives for key-scan controller replacement in industrial HMI designs.
Technical Context
The MAX7347ATE+ implements static (non-scanned) key matrix monitoring using eight row inputs (ROW0–ROW7) and three column outputs (COL0, COL1, COL2/PORT2), enabling deterministic low-EMI operation without clocked switching noise. Its I²C interface supports four slave address options via AD0 and includes configurable bus timeout (20–68ms) to prevent lockup on SCL hang.
It integrates a dedicated sounder controller with 14 programmable musical frequencies (523.25Hz–2637Hz), double-buffered command queue, and autoloop capability - all accessible via a separate I²C slave address. The INT pin serves dual role: active-low interrupt or open-drain GPO for LED drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4V to 3.6V - ensures compatibility with modern 3.3V logic systems and low-power battery-backed instrumentation. |
| Key-Switch Capacity | Up to 24 switches - fixed capacity for MAX7347; enables compact front-panel interfaces without external multiplexing. |
| FIFO Depth | 8 debounced key events - prevents loss during burst presses and simplifies host polling architecture. |
| I²C Speed | 400kbps - supports high-throughput key-event streaming in real-time HMI applications. |
| SOUNDER Accuracy | ±1.2% at +25°C - guarantees stable tone generation for audible feedback in safety-critical medical devices. |
| Shutdown Current | 6.44µA to 10µA - enables ultra-low-power standby in portable diagnostic equipment. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive control panels and industrial PLC operator terminals. |
Pinout & Package
MAX7347ATE+ is housed in a 16-pin TQFN-EP (4mm × 4mm, 0.5mm pitch) with exposed paddle thermally connected to GND. The package supports high-density PCB layouts and enhanced thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW0–ROW7 | Key matrix row inputs | Static sensing inputs; tolerate open-circuit configuration when unused - eliminates need for pull-ups in partial matrix designs. |
| COL0, COL1, COL2/PORT2 | Column outputs / GPO | Three bidirectional pins: drive key columns or serve as open-drain GPOs (INT also configurable as GPO). |
| V+, GND | Power supply terminals | V+ requires ≥0.047µF ceramic bypass to GND - critical for stable sounder waveform integrity and EMI suppression. |
| SDA, SCL | I²C bidirectional data/clock | 5.5V-tolerant inputs; require 4.7kΩ pull-ups - enable robust communication in noisy industrial environments. |
| INT | Interrupt output / GPO | Active-low open-drain output; configurable as logic output to drive LEDs directly without external drivers. |
| AD0 | I²C address select | Internally tied to GND on MAX7347 - fixes key-scan slave address to 0x71 and sounder to 0x73 (no external bias needed). |
| SOUNDER | Piezo/relay driver output | Push-pull output; delivers ±25mA - drives piezo transducers directly or controls small relays/lamps without buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Static key matrix monitoring | Eliminates dynamic scan clocks - reduces radiated EMI by >20dB compared to scanned architectures, critical for EMC-compliant medical devices. |
| Configurable debounce & autorepeat | User-selectable 9ms–40ms debounce window and independent repeat delay/rate - enables precise tactile response tuning across diverse switch types. |
| Dual I²C slave addressing | Separate addresses for key-scan (0x71) and sounder (0x73) controllers - allows concurrent register access without transaction collision or arbitration overhead. |
| Sounder command queuing | Double-buffered 2-command FIFO with autoloop - enables seamless two-tone alarms or continuous key-click feedback without host CPU intervention. |
| Bus timeout protection | Programmable 20–68ms SCL edge timeout - prevents device lockup during I²C bus faults, improving system reliability in unattended industrial deployments. |
Applications
| Medical Instrument Panels | Industrial Control Terminals |
|---|---|
Use Scenario: Front-panel keypad on portable ultrasound or infusion pump with audible keypress confirmation. IC Role / Device Role / Timing Role: Key-scan controller with integrated sounder - manages 24-button matrix and generates 987.77Hz key-click tone. Use Value: Eliminates separate microcontroller GPIO and audio DAC, reducing BOM count and layout area while meeting IEC 60601-1 EMI limits. |
Use Scenario: Operator interface on factory-floor PLC HMI with metal dome switches and status LEDs. IC Role / Device Role / Timing Role: Low-EMI key monitor and GPO driver - scans 16 switches and drives 3 LEDs via COL0/COL1/INT pins. Use Value: Static sensing avoids scan-induced noise coupling into analog sensor circuits; 125°C rating ensures reliability near motor drives. |
| Security Keypads | Test & Measurement Equipment |
Use Scenario: Tamper-resistant access panel with carbon-film membrane keypad and alarm tone. IC Role / Device Role / Timing Role: Resistive switch monitor and programmable tone generator - handles ≤1kΩ switches and produces 2093Hz alert tone. Use Value: Built-in 2637Hz upper limit and ±1.2% accuracy meet EN 50131 acoustic alarm requirements without calibration. |
Use Scenario: Benchtop oscilloscope front panel with rotary encoder + button combo and status beeps. IC Role / Device Role / Timing Role: Hybrid input controller - uses ROW/ COL pins for buttons and SOUNDER output for UI feedback tones. Use Value: 400kbps I²C interface synchronizes key events with display updates; shutdown current <10µA extends battery life in portable units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar key-scan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7348AEP+ | Monitors up to 40 keys; adds COL3–COL5/PORT3–PORT5; no ALERT input; same 16-pin footprint not supported. | Requires 20-pin QSOP layout change; suitable when expanding from 24 to 40 keys without adding MCU GPIOs. | Select MAX7348AEP+ only if higher key count justifies PCB redesign and additional column routing. |
| TCA9554PWR | I²C 8-bit GPIO expander only; no key-scan logic, FIFO, debounce, or sounder; 16-pin TSSOP package. | Cannot replace MAX7347ATE+'s core functionality - requires external firmware debounce and separate audio circuitry. | Choose TCA9554PWR only for simple digital I/O expansion where key scanning and sound are handled elsewhere. |
Compared with MAX7347ATE+, MAX7348AEP+ offers higher key density but mandates board revision, while TCA9554PWR provides basic I/O extension without integrated key management - making MAX7347ATE+ the sole solution combining low-EMI scanning, FIFO, and sounder in a 16-pin TQFN.
Availability
MAX7347ATE+ is available at Aetrix Electronics and suitable for medical instrument panels, industrial control terminals, security keypads, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX7347ATE+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and automotive applications.
The MAX7347/MAX7348/MAX7349 product line was designed specifically for EMI-sensitive human-machine interfaces requiring integrated key scanning, debouncing, and audible feedback - eliminating discrete solutions in space-constrained, high-reliability systems.
FAQ
What is the maximum number of keys supported by the MAX7347ATE+?
The MAX7347ATE+ supports up to 24 key switches, as defined by its fixed architecture within the MAX7347 family. This capacity is achieved using eight row inputs (ROW0–ROW7) and three column outputs (COL0, COL1, COL2/PORT2), forming a 8×3 matrix. Unlike the MAX7348 (40 keys) or MAX7349 (64 keys), the MAX7347ATE+ does not scale beyond 24 keys - no configuration or firmware update can increase this limit.
Does the MAX7347ATE+ include a built-in sounder driver?
Yes, the MAX7347ATE+ includes a dedicated push-pull SOUNDER output capable of delivering ±25mA, designed to drive piezoelectric transducers, small relays, or lamps directly. It supports 14 programmable musical frequencies (523.25Hz–2637Hz) with ±1.2% accuracy at +25°C and offers configurable duration (15.625ms–1s) - all controlled via a separate I²C slave address (0x73) independent of the key-scan interface.
What package type is used for the MAX7347ATE+?
The MAX7347ATE+ uses a 16-pin TQFN-EP package (4mm × 4mm, 0.5mm pitch) with exposed paddle. This thermally enhanced package is distinct from the 16-pin QSOP variant (MAX7347AEE+) and requires specific PCB land pattern design per Maxim's recommended layout - including solder paste stencil aperture reduction for the exposed paddle to prevent voiding.
Can the INT pin on the MAX7347ATE+ be used as a general-purpose output?
Yes, the INT pin on the MAX7347ATE+ is configurable as an open-drain general-purpose output (GPO) capable of sinking up to 10mA - allowing direct LED drive without external components. This reconfiguration is performed via the Configuration register (address 0x04); when enabled, the pin loses interrupt functionality and operates as a logic-level output synchronized to host commands.
What I²C slave addresses does the MAX7347ATE+ use?
The MAX7347ATE+ uses two fixed I²C slave addresses: 0x71 for the key-scan controller and 0x73 for the sounder controller. Because the AD0 pin is internally tied to GND on all MAX7347 variants, address selection via external biasing is not possible - unlike MAX7348/MAX7349, which support four address combinations. This simplifies bus arbitration but limits multi-device daisy-chaining to one MAX7347ATE+ per bus.
MAX7347ATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- Sound Cards, Players, Recorders
- Interface:
- I2C
- Voltage - Supply:
- 2.4V ~ 3.6V
- Supplier Device Package:
- 16-TQFN (4x4)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX7347ATE+ FAQ
1.How can I place an order for MAX7347ATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7347ATE+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX7347ATE+ reliable?
The price and inventory of MAX7347ATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7347ATE+ is usually 5 days.
3.What payment methods are accepted for MAX7347ATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7347ATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7347ATE+?
MAX7347ATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7347ATE+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX7347ATE+?
For technical support, including MAX7347ATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7347ATE+ requirements.
6.How does Aetrix verify that MAX7347ATE+ is sourced from the original manufacturer or authorized distributors?
All MAX7347ATE+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX7347ATE+ meets industry standards.
7.What is the process for return or replacement of MAX7347ATE+?
All MAX7347ATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX7347ATE+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX7347ATE+ part is unused and in its original packaging.
Return procedure for MAX7347ATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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