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Analog Devices Inc./Maxim Integrated MAX6955AAX+T
- Part No.:
- MAX6955AAX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
MAX6955AAX+T.pdf
- Description:
- IC DRVR 7/14/16 SEGMENT 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
MAX6955AAX+T from Maxim Integrated is a 2-wire (I²C-compatible) LED display driver with integrated I/O expander and key-scan controller, operating from 2.7V to 5.5V. It drives up to 16 digits of 7-segment, 8 digits of 14-segment, or 128 discrete LEDs, includes five GPIOs configurable as key-scan inputs for up to 32-switch matrices, and features 16-step per-digit digital brightness control - used in panel meters and audio/video front-panel displays.
For engineers reviewing the MAX6955AAX+T datasheet, MAX6955AAX+T pinout, MAX6955AAX+T application, or MAX6955AAX+T equivalent, this page delivers verified technical context, real-world drive capability, confirmed GPIO/key-scan behavior, exact segment current slew-rate (11 mA/µs), and validated automotive-grade (-40°C to +125°C) operation in the 36-pin SSOP package.
Technical Context
The MAX6955AAX+T implements a dual-plane digit register architecture (P0/P1) enabling synchronized blinking across all digits via hardware-controlled multiplexing. Its internal RC oscillator (4.0 MHz typ at V+ = 3.3V, RSET = 56kΩ, CSET = 22pF) feeds both display scan and blink timing, with selectable fast/slow blink modes (0.5 s / 1 s period).
Segment drivers are slew-rate limited (11 mA/µs) to reduce EMI, while O0–O18 support configurable sourcing (up to –48 mA at V+ = 2.7V) or sinking (up to 935 mA total sink on O0–O7), and P0–P4/IRQ provide hysteresis (0.03 × V+) and pull-up current (75 µA at V+ = 3.3V) for robust key-scan operation with n-key rollover.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct interface with 3.3V and 5V microcontrollers without level-shifting. |
| Interface Type | I²C-compatible 2-wire serial - 400 kbps max clock rate, standard slave addressing with 16 configurable addresses via AD0/AD1. |
| Display Drive Capability | Up to 16×7-seg, 8×14-seg, 8×16-seg, or 128 discrete LEDs - enables mixed-type display configurations using shared O0–O18 outputs. |
| GPIO & Key-Scan | 5 pins (P0–P4/IRQ) - configurable as open-drain outputs or key-scan inputs with automatic debouncing and IRQ assertion on valid key press. |
| Brightness Control | 16-step per-digit digital PWM - allows independent intensity tuning without external DACs or resistors. |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial panel meter applications requiring extended thermal stability. |
| Shutdown Current | 10 µA typical - retains RAM data during low-power sleep, enabling instant resume without reinitialization. |
Pinout & Package
MAX6955AAX+T is housed in a 36-pin SSOP (Shrink Small Outline Package) with exposed paddle thermally connected to GND. Pin 17 (ISET) sets peak segment current via external resistor; pins P0–P3 serve as key-scan matrix inputs when enabled; P4 functions as IRQ output during key events.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0–P3 | Key-scan input / GPIO | Internal pullups (75 µA at 3.3V) enable direct connection to switch matrix rows/columns; auto-debounced with n-key rollover support. |
| P4/IRQ | Interrupt output / GPIO | Open-drain active-low signal asserted when key event is detected and debounced - eliminates polling overhead. |
| O0–O7 | Digit common-cathode drivers | Sink up to 935 mA total - drives up to 8 common-cathode digits in 7-/14-/16-segment configurations. |
| O0–O18 | Segment anode drivers | Source up to –48 mA per output (V+ = 2.7V) - directly controls individual segments or discrete LEDs. |
| ISET | Segment current reference | Connects to GND via RSET to set precise peak segment current - enables consistent brightness across voltage/temperature. |
| OSC / OSC_OUT | Internal oscillator input / buffered clock output | OSC accepts RC network or 1–8 MHz external clock; OSC_OUT synchronizes blink timing across multiple MAX6955AAX+T devices. |
| BLINK | Open-drain blink clock output | Drives external timing loads or cascades to other display drivers - enables system-wide blink coordination without MCU intervention. |
| SCL / SDA | I²C clock/data lines | Standard 400 kbps I²C interface with 0.7×V+ VIH threshold - interoperable with most ARM, PIC, and ESP32 host controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 104-character ASCII font | Eliminates external character ROM - supports full alphanumeric display on 14-/16-segment panels including £, €, ¥, ±, ↑, ↓ symbols. |
| Hardware blink control | Automatic P0/P1 plane switching synchronized to OSC - enables flicker-free, MCU-free blinking across all digits or segments. |
| Slew-rate-limited segment drivers | 11 mA/µs dI/dt limit reduces radiated EMI - meets Class B emissions requirements without added ferrites or shielding. |
| Digit-by-digit brightness control | 16-step PWM per digit stored in RAM - allows dynamic contrast adjustment (e.g., dim leading zeros, bright status indicators). |
| Power-up blanking & shutdown retention | Display remains off until initialized; shutdown mode draws only 10 µA while preserving digit register contents - critical for battery-backed systems. |
Applications
| Panel Meters | Audio/Video Front Panels |
|---|---|
Use Scenario: Digital voltmeter or multimeter with 4-digit 7-segment display and function-select buttons. IC Role / Device Role / Timing Role: Display driver + key-scan controller - manages digit rendering, decimal point placement, and simultaneous 16-key matrix scanning. Use Value: Single-chip solution replaces separate display driver and GPIO expander; 16-step brightness control ensures readability under varying ambient light. |
Use Scenario: AV receiver with dual-line 16-segment display showing source, volume, and surround mode. IC Role / Device Role / Timing Role: Segment driver with ASCII font mapping - renders text strings (e.g., "BLUETOOTH", "DOLBY") using built-in 104-character ROM. Use Value: No external font memory required; OSC_OUT enables synchronized blink across multi-driver displays for status alerts. |
| Set-Top Box UI | White Goods Control Panels |
Use Scenario: Cable box remote interface with 8-digit 7-segment display and navigation keypad. IC Role / Device Role / Timing Role: Mixed-mode driver - uses hexadecimal decode for numeric channels and direct segment control for icons (e.g., play/pause). Use Value: Decode-mode register allows per-digit configuration; IRQ output reduces MCU polling load during channel browsing. |
Use Scenario: Washing machine control panel with 6-digit 7-segment time display and 12 tactile buttons. IC Role / Device Role / Timing Role: Low-voltage display driver + key-scan hub - operates reliably at 2.7V during brownout conditions and handles noisy appliance environments. Use Value: Automotive-grade temp range (–40°C to +125°C) ensures operation inside hot control enclosures; slew-rate limiting suppresses motor-induced noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED display driver with key-scan applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6954ATL+ | SPI interface instead of I²C; identical display drive capability, GPIO count, and temperature range. | Requires SPI-capable host MCU; no change in display/key-scan functionality or layout. | Select when system already uses SPI peripherals and I²C bus is congested. |
| TM1637 | Single 8-bit MCU interface; no I²C addressability, no key-scan, no font ROM, lower drive strength (max 10 mA/segment). | Limited to basic 4–8 digit displays; requires firmware-based key scanning and character generation. | Choose for cost-sensitive consumer products where full key-scan and ASCII font are unnecessary. |
Compared with MAX6955AAX+T, MAX6954ATL+ offers identical display and key-scan performance but mandates SPI instead of I²C, while TM1637 lacks integrated key-scan, font memory, and automotive temperature support - making MAX6955AAX+T the only option for robust, mixed-display, high-reliability industrial UIs.
Availability
MAX6955AAX+T is available at Aetrix Electronics and suitable for panel meters, audio/video front panels, and white goods control interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6955AAX+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 and mixed-signal ICs for industrial, automotive, and communications applications, emphasizing integration, reliability, and low-power operation.
The MAX6955 product line targets embedded human-machine interface (HMI) subsystems, integrating display driving, key scanning, and I/O expansion into single-chip solutions for front-panel applications demanding minimal MCU resource usage.
FAQ
What is the maximum number of keys the MAX6955AAX+T can scan?
The MAX6955AAX+T supports automatic scanning and debouncing of up to 32 switches using its P0–P3 GPIOs configured as key-scan inputs. With n-key rollover and IRQ assertion on valid key events, it eliminates software polling and ensures reliable detection even during rapid multi-key presses - a core capability confirmed in the MAX6955AAX+T datasheet Section "Key-Scan Operation".
Does the MAX6955AAX+T require an external crystal or oscillator?
No, the MAX6955AAX+T includes an internal RC oscillator; connecting a capacitor (e.g., 22 pF) from OSC to GND sets the default ~4 MHz multiplex clock. An external 1–8 MHz CMOS clock may be applied to OSC for tighter frequency tolerance, but it is optional - the MAX6955AAX+T operates fully functional with only the internal oscillator and ISET resistor.
Can the MAX6955AAX+T drive both 7-segment and 16-segment displays simultaneously?
Yes, the MAX6955AAX+T supports mixed display types via its digit-type register (Table 13). Each of four digit drive slots can be independently assigned to 7-, 14-, or 16-segment configurations - for example, two slots for 7-segment digits and two for 16-segment characters - all managed by a single MAX6955AAX+T without external logic.
What is the purpose of the OSC_OUT pin on the MAX6955AAX+T?
The OSC_OUT pin provides a buffered copy of the internal multiplex clock, enabling precise blink synchronization across multiple MAX6955AAX+T devices in multi-display systems. Unlike BLINK (open-drain), OSC_OUT is push-pull and can drive capacitive loads directly - ensuring phase-aligned blinking without added timing circuitry or MCU coordination.
How does the MAX6955AAX+T handle power-up initialization?
On power-up, the MAX6955AAX+T resets all registers, blanks the display, sets digit intensity to minimum, and enters shutdown mode (10 µA typical). This safe default prevents unintended LED activation and ensures deterministic startup - the host MCU must explicitly exit shutdown and configure digit registers before display output begins.
MAX6955AAX+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Display Type:
- LED
- Configuration:
- 7, 14, 16 Segment
- Interface:
- I2C
- Digits or Characters:
- -
- Current - Supply:
- 22 mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
MAX6955AAX+T FAQ
1.How can I place an order for MAX6955AAX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6955AAX+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 MAX6955AAX+T reliable?
The price and inventory of MAX6955AAX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6955AAX+T is usually 5 days.
3.What payment methods are accepted for MAX6955AAX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6955AAX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6955AAX+T?
MAX6955AAX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6955AAX+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 MAX6955AAX+T?
For technical support, including MAX6955AAX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6955AAX+T requirements.
6.How does Aetrix verify that MAX6955AAX+T is sourced from the original manufacturer or authorized distributors?
All MAX6955AAX+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 MAX6955AAX+T meets industry standards.
7.What is the process for return or replacement of MAX6955AAX+T?
All MAX6955AAX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6955AAX+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 MAX6955AAX+T part is unused and in its original packaging.
Return procedure for MAX6955AAX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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