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Analog Devices Inc./Maxim Integrated MAX6957AAI+T
- Part No.:
- MAX6957AAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX6957AAI+T.pdf
- Description:
- IC DRVR 7/16/20 SEGMENT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,816
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Product details
Overview
MAX6957AAI+T from Maxim Integrated is a 20-port, SPI-compatible LED display driver and GPIO expander in 28-pin SSOP package. It provides individually configurable ports as constant-current LED sinks (1.5–24mA, 16-step), push-pull logic outputs (10mA sink/4.5mA source), or Schmitt inputs with optional pullup. Designed for embedded panel meters and industrial controllers requiring mixed-signal I/O expansion with integrated LED drive.
For engineers reviewing the MAX6957AAI+T datasheet, MAX6957AAI+T pinout, MAX6957AAI+T application, or MAX6957AAI+T equivalent, this page delivers verified electrical specs, validated port configuration behavior, confirmed thermal range (−40°C to +125°C), and real-world interrupt-driven monitoring use cases for P24–P30 transition detection.
Technical Context
The MAX6957AAI+T implements a 4-wire SPI-compatible interface (CS/SCLK/DIN/DOUT) operating up to 26MHz, with DOUT providing delayed echo or register readback. Its 20 I/O ports (P4–P23) are mapped via seven 4-bit port-configuration registers (0x09–0x0F), supporting simultaneous LED drive and GPIO functions without conflict.
LED current is set globally via ISET resistor (RISET = 39kΩ yields 24mA max) or per-port via 16 current registers (0x12–0x1F); transition detection is hardware-accelerated for P24–P30 using a snapshot/mask comparator that asserts INT on P31. Shutdown mode reduces supply current to ≤11µA while preserving register state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V to 5.5V - supports direct interface with 3.3V and 5V microcontrollers without level shifters. |
| Operating Temperature | −40°C to +125°C - qualified for industrial and automotive under-hood environments. |
| LED Sink Current Range | 1.5mA to 24mA in 16 equal steps - enables precise brightness control across CA numeric displays and discrete LEDs. |
| GPIO Output Drive | 10mA sink / 4.5mA source - sufficient to directly drive small relays, optocouplers, or logic inputs. |
| Shutdown Current | ≤11µA at TMIN to TMAX - enables low-power sleep modes in battery-backed instrumentation. |
| SPI Clock Rate | Up to 26MHz - allows rapid update of 20-port states or full display refresh in <100µs. |
| Transition Detection | Hardware-monitored on P24–P30 with maskable enable - eliminates polling overhead for button/switch inputs. |
Pinout & Package
MAX6957AAI+T uses a 28-pin SSOP package (5.3mm × 10.2mm, 0.65mm pitch) with exposed pad internally connected to GND for thermal dissipation. Pin 1 is ISET; pins 2–3 and 25–28 are GND, SCLK, DIN, CS, and V+, respectively. Ports P4–P23 occupy pins 4–24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (Pin 1) | Current reference input | Connects to GND via RISET (e.g., 39kΩ) to set maximum LED segment current; tolerance directly impacts all 16 current steps. |
| GND (Pins 2, 3) | Power ground | Dual ground pins reduce impedance and improve noise immunity for analog LED current paths. |
| DOUT (Pin 4) | Serial data output | Outputs shifted-in command data after 15.5 clocks or register contents during read; not high-impedance - requires external tri-state if shared bus. |
| P4–P23 (Pins 5–24) | Configurable I/O ports | 20 bidirectional ports supporting LED sink, push-pull output, or Schmitt input; P4–P23 only - P24–P31 are not bonded out in 28-pin variant. |
| SCLK (Pin 25) | Serial clock input | Rising-edge sampled; timing min pulse width 19ns - compatible with standard MCU SPI peripherals at ≤26MHz. |
| DIN (Pin 26) | Serial data input | Accepts 16-bit command/data words; setup/hold times (9.5ns/0ns) allow direct connection to most FPGA/MCU GPIOs. |
| CS (Pin 27) | Chip select (active-low) | Enables serial interface; falling edge initiates shift register load; must remain low for full 16-bit transfer. |
| V+ (Pin 28) | Positive supply | Requires ≥0.047µF ceramic bypass capacitor to GND; supplies internal logic and LED drivers - no separate analog/digital rails needed. |
Key Features
| Feature | Design Value |
|---|---|
| 16-step programmable LED current | Per-port or global adjustment enables consistent brightness matching across multi-digit CA displays without external DACs. |
| Hardware transition detection on 7 ports | Reduces CPU polling load by generating interrupt on P31 when any of P24–P30 changes - critical for responsive front-panel interfaces. |
| Schmitt-trigger inputs with selectable pullup | Eliminates external RC debounce components; internal pullup (12–180µA depending on V+) supports direct switch interfacing. |
| 20-port flexibility in 28-pin SSOP | Smaller footprint than 28-port variants while retaining full GPIO/LED functionality - ideal for space-constrained industrial HMI designs. |
| 26MHz SPI-compatible interface | Enables sub-100µs full-port updates - sufficient for real-time bar graph or status indicator refresh in system monitors. |
Applications
| Panel Meters | Industrial Controllers |
|---|---|
Use Scenario: Digital front panel displaying voltage, current, or temperature readings using 7-segment CA digits and status LEDs. IC Role / Device Role / Timing Role: LED driver for digit segments and GPIO for pushbutton inputs and relay control outputs. Use Value: Single-chip replaces discrete transistors, current-limiting resistors, and I/O expanders - reducing BOM count by >12 components. |
Use Scenario: Modular PLC I/O module requiring local LED status indication and field-device signal conditioning. IC Role / Device Role / Timing Role: Configurable GPIO for sensor input debouncing and LED sink for fault/status indicators. Use Value: Hardware transition detection on P24–P30 enables immediate response to emergency stop or limit switch events without CPU intervention. |
| Set-Top Boxes | Bar Graph Displays |
Use Scenario: Front-panel display showing channel number, signal strength, and menu navigation status. IC Role / Device Role / Timing Role: Constant-current LED driver for alphanumeric CA digits and GPIO for IR receiver input and button scan. Use Value: 16-step current control ensures uniform segment brightness across varying supply voltage (2.5V–5.5V) and temperature (−40°C to +125°C). |
Use Scenario: Analog-style level meter using linear LED array (e.g., 10-segment bar) for audio or power monitoring. IC Role / Device Role / Timing Role: Simultaneous LED sink for all segments with individual intensity programming via current registers. Use Value: Full 20-port utilization allows driving 16-segment bar + DP + 4 status LEDs in single IC - eliminating need for cascaded drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6956ATL+ | 2-wire (I²C) interface; 20 ports; same LED current range and temperature rating; no transition detection interrupt. | Lacks hardware interrupt for port changes - requires software polling for button/switch inputs. | Select when board already uses I²C bus and interrupt latency is not critical. |
| MAX7301ATG+ | 28-port GPIO expander only; no LED constant-current drive; 2.5V–5.5V; −40°C to +125°C; 10mA sink/output. | Cannot drive LEDs directly - requires external current-limiting resistors or drivers for display applications. | Select when only digital I/O expansion is needed and LED drive is handled separately. |
Compared with MAX6956ATL+ and MAX7301ATG+, the MAX6957AAI+T uniquely integrates programmable LED current control, hardware transition detection, and SPI interface in a 28-pin SSOP - making it optimal for cost-sensitive, space-constrained designs requiring both display and interactive I/O.
Availability
MAX6957AAI+T is available at Aetrix Electronics and suitable for industrial controllers, panel meters, and set-top box front panels requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6957AAI+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 systems.
The MAX6957 product line targets embedded human-machine interface applications needing compact, low-power I/O expansion with integrated LED drive - eliminating external components for displays and front-panel controls.
FAQ
What is the maximum LED segment current supported by the MAX6957AAI+T?
The MAX6957AAI+T supports up to 24mA per LED segment when configured as a constant-current sink, set by the external ISET resistor (e.g., 39kΩ to GND). This maximum is adjustable in 16 equal steps down to 1.5mA, enabling precise brightness control across CA numeric and alphanumeric displays without external current-setting components.
How many I/O ports does the MAX6957AAI+T provide, and which pins are used?
The MAX6957AAI+T provides 20 configurable I/O ports (P4 through P23), mapped to physical pins 5 through 24 of its 28-pin SSOP package. Unlike the 28-port variants (MAX6957AAX/MAX6957ATL), P24–P31 are not bonded out - confirmed by pin description tables and ordering information in the official datasheet.
Does the MAX6957AAI+T support hardware interrupt generation for input changes?
Yes, the MAX6957AAI+T supports hardware transition detection on ports P24–P30. Though only P4–P23 are physically available in the 28-pin SSOP, the internal architecture retains the detection logic - and P31 (pin 4) functions as the active-high interrupt output. To use it, configure P31 as output and enable detection via the configuration register's M bit.
What is the operating temperature range of the MAX6957AAI+T?
The MAX6957AAI+T is rated for operation from −40°C to +125°C, fully specified across this range for key parameters including supply current, LED sink current, and GPIO drive strength. This makes it suitable for industrial automation, automotive cabin modules, and outdoor equipment where ambient temperatures exceed commercial-grade limits.
Can the MAX6957AAI+T be used with a 3.3V microcontroller SPI interface?
Yes, the MAX6957AAI+T is fully compatible with 3.3V microcontroller SPI interfaces. Its digital inputs (SCLK, DIN, CS) accept VIH ≥ 1.6V (for V+ ≤ 3.3V) and VIL ≤ 0.6V, and its DOUT output drives VOH ≥ V+ − 0.5V - ensuring robust logic-level interoperability without level-shifting circuitry.
MAX6957AAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Display Type:
- LED
- Configuration:
- 7, 16, 20 Segment
- Interface:
- 4-Wire Serial
- Digits or Characters:
- -
- Current - Supply:
- 180 µA
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
MAX6957AAI+T FAQ
1.How can I place an order for MAX6957AAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6957AAI+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 MAX6957AAI+T reliable?
The price and inventory of MAX6957AAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6957AAI+T is usually 5 days.
3.What payment methods are accepted for MAX6957AAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6957AAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6957AAI+T?
MAX6957AAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6957AAI+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 MAX6957AAI+T?
For technical support, including MAX6957AAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6957AAI+T requirements.
6.How does Aetrix verify that MAX6957AAI+T is sourced from the original manufacturer or authorized distributors?
All MAX6957AAI+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 MAX6957AAI+T meets industry standards.
7.What is the process for return or replacement of MAX6957AAI+T?
All MAX6957AAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6957AAI+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 MAX6957AAI+T part is unused and in its original packaging.
Return procedure for MAX6957AAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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