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Analog Devices Inc./Maxim Integrated MAX7359ETG+TG104
- Part No.:
- MAX7359ETG+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- -
- Datasheet:
-
MAX7359ETG+TG104.pdf
- Description:
- IC INTERFACE SPECIALIZED
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Product details
Overview
MAX7359ETG+TG104 from Maxim Integrated is a 2-wire (I²C) interfaced key switch controller that manages up to 64 mechanical or resistive keys with static matrix scanning, 16-entry debounced FIFO, autosleep (1µA typ), and configurable GPO functionality on COL2–COL7/PORT2–PORT7 and INT pins. It operates from +1.62V to +3.6V and supports -40°C to +85°C ambient for portable consumer electronics.
For engineers reviewing the MAX7359ETG+TG104 datasheet, MAX7359ETG+TG104 pinout, MAX7359ETG+TG104 application, or MAX7359ETG+TG104 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in handheld devices, and confirmed alternative options for key matrix management with low-EMI operation.
Technical Context
The MAX7359ETG+TG104 implements static key-matrix scanning-no dynamic row/column toggling-to minimize EMI and enable routing near noise-sensitive circuits. 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 9ms–40ms debounce intervals.
Autosleep triggers after programmable idle time (up to 8192ms), reducing supply current to ≤5µA; autowake resumes full operation within 2.4ms upon key press. The device supports four I²C slave addresses (via AD0), 400kbps bus speed, and 5.5V-tolerant SDA/SCL inputs-enabling robust host interface integration without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +1.62V to +3.6V - compatible with single Li-ion or dual-cell alkaline rails without regulation |
| Sleep Current | ≤5µA - enables multi-month battery life in always-on portable keypads |
| FIFO Depth | 16 entries - buffers burst key events without host polling overhead or data loss |
| Key Debounce Range | 9ms to 40ms - adjustable per system EMI/noise requirements and switch bounce profile |
| I²C Interface | 400kbps, 5.5V-tolerant - interoperable with legacy and modern microcontrollers without external clamping |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade portable equipment deployment |
| Key Matrix Size | 8×8 (64 keys) - scalable via row/column pin assignment; up to 6 GPOs tradeable for reduced key count |
Pinout & Package
MAX7359ETG+TG104 is packaged in a 24-pin TQFN (3.5mm × 3.5mm, exposed pad) with lead(Pb)-free/RoHS-compliant finish. Pin functions are validated per Maxim's official pin configuration diagram and functional description.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROW0–ROW7 | Row Input | Active-low scan lines; each connects to one row of key matrix; must be pulled to GND if unused |
| COL0–COL1 | Column Output | Dedicated key-switch column drivers; not configurable as GPOs |
| COL2/PORT2–COL7/PORT7 | Column/GPO Output | Configurable as key-column drivers or open-drain GPOs (up to 6); sink ≤25mA each |
| INT | Interrupt Output / GPO | Open-drain active-low interrupt; reconfigurable as GPO when not used for event signaling |
| SDA, SCL | I²C Data/Clock | 5.5V-tolerant, 400kbps-capable bidirectional interface; require external pullups |
| AD0 | I²C Address Select | Selects one of four slave addresses (0x38–0x3B) for multi-device bus configuration |
| VCC, GND, EP | Power & Ground | VCC bypass requires ≥0.047µF ceramic capacitor; EP must connect to PCB ground plane for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Static Key Scanning | Eliminates dynamic switching noise-reduces EMI by >20dB vs. conventional matrix scanners |
| Configurable GPOs | Up to 7 open-drain outputs (COL2–COL7 + INT) drive LEDs or logic directly-no external drivers needed |
| Autorepeat Engine | Hardware-accelerated key repeat with programmable delay (8–128 debounce cycles) and rate (4–32 cycles) |
| I²C Bus Timeout | Selectable 10ms–40ms timeout prevents lockup from bus glitches-no host firmware watchdog required |
| Low-Voltage Operation | Full functionality down to +1.62V-supports direct connection to partially discharged Li-ion batteries |
Applications
| Smartphone Keypad Interface | Handheld Gaming Console Controls |
|---|---|
Use Scenario: Managing physical keypad, side buttons, and function keys in space-constrained smartphones with strict EMI limits. IC Role / Device Role / Timing Role: Key switch controller with static matrix scan and hardware FIFO-offloads MCU polling and ensures deterministic key latency. Use Value: Enables reliable tactile input at <1µA sleep current while meeting FCC Class B radiated emissions without shielding. |
Use Scenario: Supporting directional pads, action buttons, and shoulder triggers in battery-powered gaming handhelds. IC Role / Device Role / Timing Role: Dual-role peripheral: scans 64-key matrix during gameplay and drives status LEDs via GPOs during menu navigation. Use Value: Reduces BOM count by integrating key scan + LED drive + interrupt generation in one 3.5mm × 3.5mm package. |
| PDA Power & Function Keys | Portable Medical Device Keypad |
Use Scenario: Handling power-on, reset, and mode-select keys in PDAs where accidental presses must be rejected. IC Role / Device Role / Timing Role: Configurable debounce (9–40ms) and optional key-release detection ensure only intentional presses register. Use Value: Prevents spurious wakeups and false commands-critical for devices requiring long standby without user interaction. |
Use Scenario: Providing tactile feedback and secure input for infusion pump or glucose meter keypads in clinical environments. IC Role / Device Role / Timing Role: Monitors metallic or carbon-film switches (≤5kΩ) with fail-safe autosleep/autowake and FIFO retention during sleep. Use Value: Guarantees key event integrity across temperature (-40°C to +85°C) and battery voltage sag (down to +1.62V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar key switch controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7360ETG+ | Same 24-pin TQFN footprint; adds GPIO expansion (8-bit I/O port) but no GPO capability on column pins | Better suited for systems needing general-purpose I/O alongside key scan-not optimized for LED-driving GPOs | Select MAX7360ETG+ only if GPIO count outweighs need for integrated LED drive on COL/INT pins |
| TCA8418RTWR | TI part with identical 64-key capacity, 16-deep FIFO, and I²C interface-but lacks autosleep (<5µA) and static scan architecture | Higher EMI due to dynamic scanning; requires external debounce logic for noisy switch types | Choose TCA8418RTWR only when leveraging TI ecosystem tools; avoid where low-EMI or ultra-low sleep current is mandatory |
Compared with MAX7359ETG+TG104, MAX7360ETG+ trades GPO flexibility for GPIO expansion, while TCA8418RTWR sacrifices EMI performance and sleep efficiency for broader vendor support-making MAX7359ETG+TG104 optimal for compact, battery-sensitive, noise-critical keypads.
Availability
MAX7359ETG+TG104 is available at Aetrix Electronics and suitable for smartphone keypad interfaces, handheld gaming console controls, PDA power/function keys, portable medical device keypads, and other applications requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX7359ETG+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, automotive, and consumer applications.
The MAX7359ETG+TG104 belongs to Maxim's key switch controller product line-engineered specifically for ultra-low-power, low-EMI human interface management in portable electronics with stringent size and battery-life constraints.
FAQ
What is the maximum key-switch resistance supported by the MAX7359ETG+TG104?
The MAX7359ETG+TG104 supports key-switch resistance up to 5kΩ, accommodating both metallic and carbon-film (resistive) switches. This specification is validated 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 high-resistance aging contacts or long PCB traces.
Does the MAX7359ETG+TG104 require an external crystal or oscillator?
No, the MAX7359ETG+TG104 integrates a factory-trimmed 64kHz oscillator and requires no external timing components. This internal clock drives all key-scan, debounce, and autosleep timing functions-reducing BOM count, board area, and startup complexity compared to crystal-dependent controllers.
Can the INT pin of the MAX7359ETG+TG104 be used as a general-purpose output?
Yes, the INT pin of the MAX7359ETG+TG104 can be reconfigured as an open-drain general-purpose output (GPO) via the Ports Register (0x04). When enabled, it sinks up to 10mA at VOL ≤0.5V and supports LED driving or logic-level signaling-providing design flexibility without adding discrete transistors.
How many keys can the MAX7359ETG+TG104 monitor when using all six GPOs?
When all six GPOs (COL2/PORT2 through COL7/PORT7) are enabled, the MAX7359ETG+TG104 monitors 16 keys (8 rows × 2 columns). Each GPO configured reduces the available column count by one, decreasing total key capacity by eight keys per GPO-scaling linearly from 64 keys (0 GPOs) down to 16 keys (6 GPOs).
What is the wakeup latency of the MAX7359ETG+TG104 from autosleep mode?
The MAX7359ETG+TG104 wakes from autosleep mode in ≤2.4ms after a valid key press, as specified in the Startup Time from Shutdown parameter. During this interval, internal current sources activate, the oscillator stabilizes, and the first debounced key event enters the FIFO-ensuring responsive user interaction without perceptible lag.
MAX7359ETG+TG104 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:
- -
- Voltage - Supply:
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- Supplier Device Package:
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- Grade:
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MAX7359ETG+TG104 FAQ
1.How can I place an order for MAX7359ETG+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7359ETG+TG104 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+TG104 reliable?
The price and inventory of MAX7359ETG+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7359ETG+TG104 is usually 5 days.
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MAX7359ETG+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7359ETG+TG104 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+TG104?
For technical support, including MAX7359ETG+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7359ETG+TG104 requirements.
6.How does Aetrix verify that MAX7359ETG+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX7359ETG+TG104 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+TG104 meets industry standards.
7.What is the process for return or replacement of MAX7359ETG+TG104?
All MAX7359ETG+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX7359ETG+TG104, 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+TG104 part is unused and in its original packaging.
Return procedure for MAX7359ETG+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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