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Analog Devices Inc./Maxim Integrated MAX7347ATE+T
- Part No.:
- MAX7347ATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX7347ATE+T.pdf
- Description:
- IC INTERFACE SPECIALIZED 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
The MAX7347ATE+T from Maxim Integrated is a 16-pin TQFN-packaged I²C key-switch and sounder controller designed for low-EMI static matrix scanning of up to 24 metallic or resistive (≤1kΩ) switches. It features an 8-deep debounced FIFO, user-configurable 9ms–40ms debounce time, autorepeat control, and a dedicated push-pull SOUNDER output capable of driving piezo transducers or relays. It serves as a compact interface between microcontrollers and front-panel keypads in harsh industrial or medical environments.
For engineers reviewing the MAX7347ATE+T datasheet, MAX7347ATE+T pinout, MAX7347ATE+T application, or MAX7347ATE+T equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternatives with documented functional trade-offs, and supply-chain-ready availability details - all grounded in Maxim's official documentation and electrical characteristics.
Technical Context
The MAX7347ATE+T implements static (non-scanned) key monitoring using column/row architecture with internal current sourcing (28–40µA per switch) and voltage threshold detection (0.35–0.65V), eliminating EMI-prone multiplexing. Its I²C interface operates at up to 400kbps with 5.5V-tolerant pins, bus timeout (20–68ms), and four selectable slave addresses via AD0.
Unlike MAX7348/MAX7349, the MAX7347ATE+T lacks tone generation circuitry and ALERT input; it supports only one fixed I²C slave address pair and provides just one general-purpose open-drain output (INT pin reconfigurable as GPO). Its sounder functionality is absent - no musical frequencies, no dual-tone alarms, no programmable duration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Key capacity | Monitors up to 24 switches - limits matrix size to 3×8 or 4×6 layouts; no support for 40/64-key configurations. |
| Supply voltage | 2.4V to 3.6V - compatible with 3.3V systems only; not 5V-tolerant on V+; requires local 0.047µF ceramic bypass. |
| I²C speed | Up to 400kbps - meets Fast-mode I²C spec; supports standard microcontroller peripherals without clock stretching. |
| Debounce time | User-configurable 9ms–40ms - prevents false triggers from mechanical bounce; set via register 0x01. |
| FIFO depth | 8-event queue - buffers key-press events including autorepeat; enables reliable polling without interrupt latency. |
| Shutdown current | 6.44µA to 10µA - enables ultra-low-power standby in battery-operated panels; exit time <200µs. |
| Operating temp | -40°C to +125°C - qualified for under-hood automotive, industrial control cabinets, and medical enclosures. |
Pinout & Package
MAX7347ATE+T uses a 16-pin 3mm×3mm TQFN-EP package (exposed paddle, thermally connected to GND) with wettable flanks for automated optical inspection. Pin 1 marked by dot; EP soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW0–ROW7 | Key matrix row inputs | High-impedance CMOS inputs; accept open-circuit or grounded rows; enable 8-row static scan. |
| COL0–COL1 | Key matrix column outputs | CMOS outputs sourcing 28–40µA; drive columns directly - no external pull-ups needed. |
| COL2/PORT2 | Column output or GPO | Configurable as key-column driver or open-drain logic output; drives LEDs or logic-level signals. |
| V+ | Positive supply | 2.4V–3.6V input; must be bypassed locally with ≥0.047µF ceramic capacitor to GND. |
| GND | Ground reference | Primary return path; exposed paddle internally tied to GND - must connect to large ground plane. |
| SDA / SCL | I²C bidirectional data / clock | 5.5V-tolerant inputs; require external 4.7kΩ pull-ups; support multi-master arbitration and repeated START. |
| INT | Interrupt or GPO | Active-low open-drain output; configurable as hardware interrupt or LED driver (sink ≤10mA). |
| AD0 | Address select | Internally tied to GND - fixes I²C slave address; prevents bus sharing with other MAX7347 devices. |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI static key monitoring | Eliminates dynamic scanning noise - allows routing near sensitive analog or RF sections without shielding. |
| Configurable debounce & autorepeat | Independent register control (0x01, 0x02) enables precise tuning for tactile vs. membrane switches. |
| Hardware interrupt with FIFO level trigger | INT asserts on first key event or when FIFO reaches user-defined depth - reduces CPU polling overhead. |
| Single open-drain GPO (INT pin) | Reuses interrupt pin as LED driver - saves board space in space-constrained front panels. |
| Industrial temperature range | -40°C to +125°C operation - validated across full range for reliability in uncontrolled environments. |
Applications
| Medical Keypad Interfaces | Industrial Control Panels |
|---|---|
Use Scenario: Front-panel keypads on infusion pumps, diagnostic monitors, and portable ultrasound devices requiring EMI-safe operation near sensitive analog signal paths. IC Role / Device Role / Timing Role: Key-scan controller managing 24-button matrix with static sensing; provides debounced, timestamped key events via I²C to host MCU. Use Value: Eliminates scan-clock EMI that could corrupt ADC readings or disrupt RF modules - critical for FDA-compliant designs. |
Use Scenario: Operator interfaces on PLC-mounted HMI units, motor drives, and safety-rated control cabinets exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Low-power key interface handling 24-position selector switches and function keys; operates reliably from -40°C to +125°C. Use Value: Enables direct integration into industrial PCBs without external level shifters or debounce RC networks - reduces BOM count and layout area. |
| Security Access Keypads | Instrumentation Front Ends |
Use Scenario: Tamper-resistant entry keypads for biometric door controllers and alarm panels where false key detection must be avoided. IC Role / Device Role / Timing Role: Static key monitor with 9–40ms software-tunable debounce; reports events via FIFO to avoid missed presses during high-CPU-load states. Use Value: Prevents unauthorized access due to contact bounce or ESD-induced false triggers - meets UL 294 timing robustness requirements. |
Use Scenario: Benchtop test equipment (oscilloscopes, spectrum analyzers) with membrane keypads requiring silent, glitch-free operation. IC Role / Device Role / Timing Role: I²C peripheral offloading key-handling from main processor; supports polling mode with single-byte FIFO read for minimal firmware overhead. Use Value: Reduces MCU interrupt load and eliminates need for custom debounce firmware - accelerates time-to-market for certified lab instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar key-switch interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7348AEP+ | Supports 40-key matrix, adds tone generator, ALERT input, and three GPOs; uses 20-pin QSOP. | Required for larger keypads or audible feedback (key-clicks/alarm tones); not drop-in - needs PCB redesign. | Select when >24 keys or sounder functionality is mandatory; verify I²C address conflict if multiple devices share bus. |
| TCA9554PWR | I²C 8-bit GPIO expander (no key-scan logic, no debounce, no FIFO); 16-pin TSSOP; 1.65–5.5V supply. | Suitable only for simple switch polling with external firmware debounce; no autorepeat or EMI-optimized scanning. | Choose only for cost-sensitive, low-complexity designs where MCU handles all timing logic and EMI is not critical. |
Compared with MAX7348AEP+, the MAX7347ATE+T offers smaller footprint and lower power but sacrifices scalability and audio features; versus TCA9554PWR, it delivers integrated, hardware-accelerated key management - reducing firmware burden and improving EMI resilience in demanding environments.
Availability
MAX7347ATE+T is available at Aetrix Electronics and suitable for medical instrumentation, industrial control panels, security access systems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX7347ATE+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, medical, and automotive applications.
The MAX7347ATE+T belongs to Maxim's key-switch controller product line, engineered specifically for EMI-sensitive human-interface applications where reliable, low-power, hardware-debounced key scanning is required without microcontroller overhead.
FAQ
What is the maximum number of keys supported by the MAX7347ATE+T?
The MAX7347ATE+T supports up to 24 key switches, implemented via an 8-row × 3-column matrix (ROW0–ROW7 and COL0–COL2/PORT2). This is a fixed capability - unlike MAX7348/MAX7349, it cannot be expanded beyond 24 keys. The device does not include tone generation or ALERT functionality found in higher-pin-count variants.
Does the MAX7347ATE+T include a built-in tone generator or sounder driver?
No, the MAX7347ATE+T does not include tone generation circuitry or a dedicated sounder output. Unlike MAX7348/MAX7349, it lacks the SOUNDER pin and associated musical frequency engine. Its pinout omits SOUNDER and ALERT; only COL2/PORT2 can be repurposed as a basic GPO - not for audio waveform generation.
Can the INT pin on the MAX7347ATE+T be used as a general-purpose output?
Yes, the INT pin on the MAX7347ATE+T is configurable as an open-drain general-purpose output (GPO) capable of sinking up to 10mA. When not used for interrupt signaling, it can drive LEDs or interface with logic-level inputs. Configuration is done via register 0x03 (Interrupt register), where bit D0 controls INT/GPO mode.
What are the I²C addressing options for the MAX7347ATE+T?
The MAX7347ATE+T has a fixed I²C slave address because its AD0 pin is internally tied to GND. It uses only one key-scan slave address (0x71 write / 0x71 read) and no sounder address - unlike MAX7348/MAX7349, which support four address combinations via external AD0 routing. Only one MAX7347ATE+T can reside on a given I²C bus.
Is the MAX7347ATE+T suitable for automotive applications?
The MAX7347ATE+T is rated for -40°C to +125°C operation and meets industrial reliability standards, but it is not AEC-Q100 qualified. It may be used in non-safety-critical automotive cabin interfaces (e.g., infotainment auxiliary keypads) where full automotive qualification is not mandated - however, system-level validation remains the designer's responsibility.
MAX7347ATE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX7347ATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7347ATE+T 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+T reliable?
The price and inventory of MAX7347ATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7347ATE+T is usually 5 days.
3.What payment methods are accepted for MAX7347ATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7347ATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7347ATE+T?
MAX7347ATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7347ATE+T 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+T?
For technical support, including MAX7347ATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7347ATE+T requirements.
6.How does Aetrix verify that MAX7347ATE+T is sourced from the original manufacturer or authorized distributors?
All MAX7347ATE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX7347ATE+T?
All MAX7347ATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX7347ATE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX7347ATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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