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Analog Devices Inc./Maxim Integrated MAX7347AEE+
- Part No.:
- MAX7347AEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX7347AEE+.pdf
- Description:
- IC INTERFACE SPECIALIZED 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
The MAX7347AEE+ 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 an open-drain INT output and a push-pull SOUNDER output for piezo transducers or lamps - used in medical instrument front panels requiring reliable tactile feedback and EMI-sensitive environments.
For engineers reviewing the MAX7347AEE+ datasheet, MAX7347AEE+ pinout, MAX7347AEE+ application, or MAX7347AEE+ equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two confirmed alternative parts - all grounded in Maxim's official datasheet Rev 5 (2007) and package-specific ordering information for the 16-pin QSOP variant.
Technical Context
The MAX7347AEE+ implements static (non-scanned) key matrix monitoring to eliminate dynamic switching noise, reducing system-level EMI. Its I²C interface supports 400kbps operation with 5.5V-tolerant SDA/SCL pins and configurable bus timeout (20–68ms).
It integrates dual-function column outputs (COL0–COL2/PORT2) that serve either as key matrix drivers or general-purpose open-drain logic outputs (up to 1 GPO), plus a dedicated push-pull SOUNDER output capable of generating 14 programmable musical tones (523Hz–2637Hz) or DC-level control for relays/lamps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Key Inputs | 24 switches max; static matrix architecture eliminates scanning noise and enables routing near sensitive analog sections. |
| Supply Voltage | 2.4V to 3.6V; compatible with modern low-voltage microcontrollers and battery-backed systems. |
| FIFO Depth | 8 debounced key events; prevents loss during burst presses and simplifies host polling without interrupt overhead. |
| Debounce Time | User-configurable 9ms to 40ms; avoids false triggers from mechanical switch bounce while supporting fast response. |
| I²C Speed | Up to 400kbps; meets Fast-mode I²C standard for responsive host communication in real-time UIs. |
| SOUNDER Output | Push-pull, ±25mA drive; directly drives piezo transducers or small relays without external buffers. |
| Shutdown Current | ≤10µA; enables ultra-low-power standby in portable or energy-harvested medical devices. |
Pinout & Package
MAX7347AEE+ is housed in a 16-pin QSOP (Package Code E16-4) with exposed paddle internally connected to GND for thermal performance. Pin functions are validated per Maxim's datasheet Rev 5, Figure 1 and Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW0–ROW7 | Key matrix row inputs | High-impedance CMOS inputs; accept open-circuit or pulled-down rows; enable 8×3 matrix (24 keys). |
| COL0, COL1, COL2/PORT2 | Column outputs / GPO | Configurable as active-low key drivers or open-drain logic outputs (max 25mA sink); COL2/PORT2 may serve as GPO if key count reduced. |
| V+, GND | Power supply terminals | V+ requires ≥0.047µF ceramic bypass to GND; GND connects to exposed paddle for thermal dissipation. |
| SDA, SCL | I²C bidirectional data/clock | 5.5V-tolerant inputs; require 4.7kΩ pullups; support multi-master arbitration and bus timeout. |
| INT | Interrupt / GPO | Active-low open-drain output; configurable as hardware interrupt on key press or as LED-driving GPO. |
| SOUNDER | Audio/DC output driver | Push-pull output; generates square-wave tones or steady high/low for piezo, relay, or lamp control. |
| AD0 | I²C address select | Internally tied to GND; fixes key-scan slave address at 0x71 (write) / 0x71 (read); no sounder controller. |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI static key scan | Eliminates periodic scanning current spikes, enabling placement near precision analog or RF circuitry without shielding. |
| Configurable debounce & autorepeat | Independent 9–40ms debounce and adjustable autorepeat delay/rate allow tuning for mechanical switch characteristics and UI responsiveness. |
| Dual-role column outputs | COL2/PORT2 can be repurposed as GPO when fewer than 24 keys are used - trading key capacity for LED status indicators. |
| Integrated sounder driver | Generates 14 precise musical frequencies (e.g., A5=880Hz) or DC levels; eliminates need for external tone generator IC or transistor stage. |
| Hardware interrupt flexibility | INT pin can signal every debounced key event or be configured as open-drain GPO - simplifying board layout and firmware design. |
Applications
| Medical Instrument Keypads | Industrial Control Panels |
|---|---|
|
Use Scenario: Front-panel membrane keypad on portable ultrasound or infusion pump with strict EMI limits and tactile feedback requirements. IC Role / Device Role / Timing Role: Key-scan controller and audible click generator; handles debounce, FIFO queuing, and tone synthesis independently of host MCU. Use Value: Reduces MCU interrupt load by 100% for key handling and ensures zero EMI impact on analog front-end signal integrity. |
Use Scenario: Ruggedized HMI panel in factory automation with metal dome switches and status LEDs. IC Role / Device Role / Timing Role: Matrix scanner and GPO driver; converts 24 key inputs into I²C packets and drives 1 LED indicator via COL2/PORT2. Use Value: Cuts BOM count by eliminating discrete debounce RC networks and LED driver transistors. |
| Security Access Keypads | Test & Measurement Equipment |
|
Use Scenario: Tamper-resistant access terminal with carbon-film keypad and audible confirmation tone. IC Role / Device Role / Timing Role: Low-noise key monitor and sounder controller; detects keypresses and plays 880Hz "accept" tone via SOUNDER pin. Use Value: Meets EN 61000-6-3 Class B radiated emissions due to static scan architecture. |
Use Scenario: Benchtop oscilloscope or spectrum analyzer with soft-touch front panel and power-on self-test beep. IC Role / Device Role / Timing Role: Standalone key handler and startup tone generator; operates from 3.3V rail and initiates 250ms alert tone on power-up. Use Value: Enables deterministic 57–200µs wake-from-shutdown response for immediate UI readiness. |
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+ | 20-pin QSOP; supports up to 40 keys and includes tone generator with 4 I²C addresses; adds COL3/PORT3–COL4/PORT4 GPOs. | Required where >24 keys or dual-tone alarm capability is needed; not drop-in due to pin count and address configuration differences. | Select MAX7348AEP+ only if expanding key count beyond 24 or requiring programmable dual-tone alarms. |
| TCA9554PWR | 8-bit I²C GPIO expander (no key-scan logic, no FIFO, no sounder); 16-pin TSSOP; 1.65–5.5V operation. | Only suitable for simple switch polling with host MCU debounce; lacks hardware FIFO, autorepeat, and audio generation. | Choose TCA9554PWR only for cost-sensitive, low-complexity UIs where MCU handles all timing and audio. |
Compared with MAX7347AEE+, MAX7348AEP+ offers higher key density and richer audio features but requires PCB redesign; TCA9554PWR reduces functionality to basic I/O expansion, shifting debounce and tone generation to firmware - making MAX7347AEE+ optimal for EMI-constrained 24-key systems needing integrated audio feedback.
Availability
MAX7347AEE+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial HMI panels, and security access systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX7347AEE+ 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 MAX7347 family targets EMI-sensitive human-interface systems, delivering integrated key-scan and audio feedback in compact packages to reduce system-level noise and BOM complexity.
FAQ
What is the maximum number of keys supported by the MAX7347AEE+?
The MAX7347AEE+ supports up to 24 key switches using an 8-row × 3-column static matrix configuration. This is fixed for the MAX7347 variant - unlike the MAX7348 (40 keys) or MAX7349 (64 keys). Row inputs ROW0–ROW7 and column outputs COL0–COL2/PORT2 are used exclusively for this 24-key topology in the MAX7347AEE+.
Does the MAX7347AEE+ include a tone generator like the MAX7348/MAX7349?
No, the MAX7347AEE+ does not include a tone generator or sounder controller. Per Maxim's datasheet Table 1 and Detailed Description, only MAX7348 and MAX7349 feature the sounder function. The MAX7347AEE+ retains the SOUNDER pin but configures it as a push-pull general-purpose output - usable for driving LEDs, relays, or lamps, but not for generating musical tones.
What are the I²C address options for the MAX7347AEE+?
The MAX7347AEE+ 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 0x71 (7-bit address 0x38 with R/W bit). Unlike MAX7348/MAX7349, it does not support multiple address configurations or a separate sounder controller address.
Can the INT pin on the MAX7347AEE+ be used as a general-purpose output?
Yes, the INT pin on the MAX7347AEE+ 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 loads up to 25mA sink current - providing flexible I/O expansion without adding discrete transistors.
What is the operating temperature range for the MAX7347AEE+?
The MAX7347AEE+ is rated for continuous operation from –40°C to +125°C, as confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. This wide range supports deployment in harsh environments such as industrial control cabinets, automotive under-hood modules, and portable medical equipment.
MAX7347AEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Sound Cards, Players, Recorders
- Interface:
- I2C
- Voltage - Supply:
- 2.4V ~ 3.6V
- Supplier Device Package:
- 16-QSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX7347AEE+ FAQ
1.How can I place an order for MAX7347AEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7347AEE+ 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 MAX7347AEE+ reliable?
The price and inventory of MAX7347AEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7347AEE+ is usually 5 days.
3.What payment methods are accepted for MAX7347AEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7347AEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7347AEE+?
MAX7347AEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7347AEE+ 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 MAX7347AEE+?
For technical support, including MAX7347AEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7347AEE+ requirements.
6.How does Aetrix verify that MAX7347AEE+ is sourced from the original manufacturer or authorized distributors?
All MAX7347AEE+ 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 MAX7347AEE+ meets industry standards.
7.What is the process for return or replacement of MAX7347AEE+?
All MAX7347AEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX7347AEE+, 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 MAX7347AEE+ part is unused and in its original packaging.
Return procedure for MAX7347AEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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