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Analog Devices Inc./Maxim Integrated MAX7359ETG+TG05
- Part No.:
- MAX7359ETG+TG05
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- -
- Datasheet:
-
MAX7359ETG+TG05.pdf
- Description:
- IC INTERFACE SPECIALIZED
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Product details
Overview
MAX7359ETG+TG05 from Maxim Integrated is a 2-wire (I²C) interfaced key switch controller supporting up to 64-key matrix scanning with static low-EMI monitoring, 16-entry debounced FIFO, autosleep mode (1µA typ), and configurable GPO functionality on COL2–COL7/PORT2–PORT7 and INT pins. It operates from +1.62V to +3.6V and targets portable consumer electronics requiring robust key event handling.
For engineers reviewing the MAX7359ETG+TG05 datasheet, MAX7359ETG+TG05 pinout, MAX7359ETG+TG05 application, or MAX7359ETG+TG05 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for key matrix management in space-constrained, battery-sensitive designs.
Technical Context
The MAX7359ETG+TG05 implements static matrix scanning-key inputs are monitored without dynamic row/column toggling-reducing EMI and enabling routing near noise-sensitive circuitry. Its internal 64kHz oscillator drives key-scan timing, and all key events (press/release, autorepeat) are debounced and queued in a 16-byte FIFO with user-configurable debounce (9–40ms).
Autosleep triggers after programmable idle time (up to 8192ms); autowake resumes operation within 2ms of key press while preserving FIFO contents. The I²C interface supports 400kbps, 5.5V-tolerant signaling, four slave addresses (via AD0), and optional bus timeout (10–40ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Key Capacity | Monitors up to 64 keys in 8×8 matrix; each key supports press/release detection and optional autorepeat. |
| Supply Voltage Range | +1.62V to +3.6V - compatible with single-cell Li-ion, Li-poly, and 3.3V logic rails without level-shifting. |
| Sleep Current | 0.6µA to 5µA - enables multi-month battery life in always-on portable devices with infrequent key usage. |
| FIFO Depth | 16 entries - buffers consecutive key events without host polling overhead or data loss during MCU latency. |
| I²C Interface | 400kbps, 5.5V-tolerant, 4 selectable addresses - simplifies multi-device bus design and supports mixed-voltage systems. |
| Debounce Time | User-configurable 9ms–40ms - eliminates mechanical switch bounce without firmware intervention or external RC networks. |
| GPO Capability | Up to 7 open-drain outputs (COL2–COL7, INT) - drives LEDs directly (≤10mA sink) or replaces discrete GPIO expanders. |
Pinout & Package
MAX7359ETG+TG05 is packaged in a 24-pin TQFN (3.5mm × 3.5mm, exposed pad), optimized for high-density portable PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 5–8, 23, 24 | ROW0–ROW7 | Row inputs for key matrix; internally pulled up when unused - no external resistors needed for basic scan. |
| 3, 4, 9–11, 12, 13, 22 | COL0–COL7/PORT0–PORT7 | Column drivers or general-purpose open-drain outputs; configurable per register to trade key count for GPOs. |
| 14 | I.C. | Internally connected; must be tied to GND for proper operation - not a user-accessible signal. |
| 15 | GND | Ground reference and thermal path via exposed pad - requires solid ground plane connection for thermal performance. |
| 16 | AD0 | I²C address select - sets one of four slave addresses (0x68–0x6B) to enable multiple MAX7359ETG+TG05 on same bus. |
| 17 | SDA | Open-drain bidirectional I²C data line - requires external pull-up; 5.5V-tolerant for mixed-voltage system integration. |
| 18 | SCL | I²C clock input - 5.5V-tolerant; synchronous timing source for register reads/writes and FIFO access. |
| 19 | INT | Active-low open-drain interrupt - signals key events or FIFO status; configurable as GPO if unused. |
| 20 | VCC | Primary power supply - bypassed with ≥0.047µF ceramic capacitor to suppress switching noise from key-scan current sources. |
Key Features
| Feature | Design Value |
|---|---|
| Static Key Matrix Monitoring | Eliminates dynamic row/column toggling to reduce EMI by >20dB - critical for RF-sensitive handhelds like cell phones. |
| Configurable Autosleep/Autowake | Reduces average system current by >99% during idle; wake latency fixed at 2ms + debounce time - no firmware delay. |
| Hardware FIFO with Status Flag | 16-entry queue with D7/D6 flags indicates key press/release and FIFO overflow/empty state - enables efficient polled or interrupt-driven host reads. |
| Multi-Function Pin Mapping | COL2–COL7 and INT pins serve dual roles: key column drivers or open-drain GPOs - reduces BOM count and board area in compact designs. |
| Integrated Key Debounce | Programmable 9–40ms hardware debounce - removes need for software timers or external RC filters, improving deterministic response. |
Applications
| Cell Phones | PDAs |
|---|---|
Use Scenario: Front-panel keypad scanning in slim smartphones with metal/carbon switches and tight EMI budgets. IC Role / Device Role / Timing Role: Primary key event manager - scans 8×8 matrix statically, generates press/release codes, and asserts INT on FIFO threshold. Use Value: Enables reliable tactile input without compromising cellular RF performance or draining battery during standby. |
Use Scenario: Touchscreen overlay button grid on legacy PDA form factors with limited GPIO resources. IC Role / Device Role / Timing Role: GPIO expander and key scanner - converts 8 row/8 column lines into I²C-accessible FIFO data with autorepeat support. Use Value: Reduces MCU pin count by 16 while delivering deterministic key response and sleep-mode current <1µA. |
| Handheld Games | Portable Consumer Electronics |
Use Scenario: Directional pad and action-button matrix in battery-powered gaming handhelds with aggressive power targets. IC Role / Device Role / Timing Role: Low-power key controller - enters autosleep after 2s idle, wakes instantly on button press, maintains FIFO across sleep cycles. Use Value: Extends playtime by minimizing background current; eliminates missed inputs during wake transition. |
Use Scenario: Keypad interface for portable medical monitors, barcode scanners, or industrial handhelds requiring rugged, low-EMI input. IC Role / Device Role / Timing Role: EMI-robust peripheral - uses static scanning to coexist with analog sensors or wireless modules on shared PCB. Use Value: Meets Class B EMC requirements without shielding or layout compromises; supports carbon or metallic switch types up to 5kΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar key switch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7356ETG+ | 64-key capacity, identical TQFN-24 package, but lacks autorepeat and has fixed 16ms debounce. | No autorepeat support limits use in UIs requiring long-press functions (e.g., menu navigation). | Select MAX7356ETG+ only if autorepeat is unnecessary and lower cost is prioritized over feature flexibility. |
| TCA8418RTWR | 64-key I²C controller with 8KB FIFO, integrated LED driver, but higher sleep current (1.5µA min) and no static scan architecture. | Higher EMI due to dynamic scanning; unsuitable for RF-critical applications like cellular handsets. | Choose TCA8418RTWR when LED driving and larger FIFO are required, and EMI constraints are less stringent. |
Compared with MAX7356ETG+ and TCA8418RTWR, MAX7359ETG+TG05 uniquely combines ultra-low sleep current (<1µA), static low-EMI scanning, and full autorepeat configurability - making it optimal for premium portable devices where power, noise, and UI responsiveness are jointly constrained.
Availability
MAX7359ETG+TG05 is available at Aetrix Electronics and suitable for cell phones, PDAs, handheld games, and portable consumer electronics requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MAX7359ETG+TG05 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 MAX7359 product line delivers low-EMI, low-power key switch controllers targeting portable electronics where battery life, EMI compliance, and mechanical switch reliability are critical design parameters.
FAQ
What is the maximum key-switch resistance supported by the MAX7359ETG+TG05?
The MAX7359ETG+TG05 supports key-switch resistance up to 5kΩ for both metallic and resistive (carbon) switches. This specification is guaranteed across the full operating temperature range (-40°C to +85°C) and supply voltage range (+1.62V to +3.6V), ensuring reliable detection even with aging or high-resistance contacts. The internal key-switch current source provides 20–35µA to maintain valid logic levels under worst-case resistance.
How does the MAX7359ETG+TG05 achieve low-EMI operation?
The MAX7359ETG+TG05 achieves low-EMI operation through static matrix monitoring: row and column lines remain DC-biased without high-frequency toggling, eliminating broadband switching noise. Unlike dynamic scanners, it avoids clock harmonics that interfere with RF sections. This architecture is explicitly validated for cell phone use and reduces radiated emissions by >20dB compared to conventional key controllers.
Can the INT pin of the MAX7359ETG+TG05 be used as a general-purpose output?
Yes, the INT pin of the MAX7359ETG+TG05 can be configured as an open-drain general-purpose output (GPO) when not used for interrupt signaling. This is enabled via bit D1 in the Ports Register (0x04). As a GPO, it supports ≤10mA sink current and can drive LEDs directly - providing pin flexibility without adding external drivers or GPIO expanders.
What is the wakeup latency from autosleep mode for the MAX7359ETG+TG05?
The MAX7359ETG+TG05 wakes from autosleep mode in 2ms after a key press, followed by the configured debounce time (9–40ms). During this period, analog circuitry including switch matrix current sources powers up fully. The first valid key event is stored in the FIFO only after the full debounce window elapses - ensuring noise immunity without sacrificing responsiveness.
Does the MAX7359ETG+TG05 support key release detection?
Yes, the MAX7359ETG+TG05 supports optional key release detection on all 64 keys. Enabled via bit D3 in the Configuration Register (0x01), it generates distinct FIFO entries for press and release events - allowing host firmware to implement precise state tracking, double-click detection, or release-triggered actions without additional hardware or polling overhead.
MAX7359ETG+TG05 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
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- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
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- Voltage - Supply:
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- Supplier Device Package:
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- Grade:
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MAX7359ETG+TG05 FAQ
1.How can I place an order for MAX7359ETG+TG05 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7359ETG+TG05 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 MAX7359ETG+TG05 reliable?
The price and inventory of MAX7359ETG+TG05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7359ETG+TG05 is usually 5 days.
3.What payment methods are accepted for MAX7359ETG+TG05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7359ETG+TG05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7359ETG+TG05?
MAX7359ETG+TG05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7359ETG+TG05 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 MAX7359ETG+TG05?
For technical support, including MAX7359ETG+TG05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7359ETG+TG05 requirements.
6.How does Aetrix verify that MAX7359ETG+TG05 is sourced from the original manufacturer or authorized distributors?
All MAX7359ETG+TG05 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 MAX7359ETG+TG05 meets industry standards.
7.What is the process for return or replacement of MAX7359ETG+TG05?
All MAX7359ETG+TG05 units undergo pre-shipment inspection (PSI). If there is an issue with MAX7359ETG+TG05, 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 MAX7359ETG+TG05 part is unused and in its original packaging.
Return procedure for MAX7359ETG+TG05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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