Analog Devices Inc./Maxim Integrated MAX6954ATL+

Overview

The MAX6954ATL+ from Maxim Integrated is a 40-pin TQFN-EP LED display driver IC that interfaces microprocessors to 7-/14-/16-segment and discrete LED displays via a 26MHz SPI/QSPI-compatible 4-wire serial interface. It drives up to 16 digits of 7-segment, 8 digits of 14-segment, or 128 discrete LEDs from 2.7V–5.5V supply, integrates five GPIOs configurable as key-scan inputs for up to 32 switches, and features 16-step digit-by-digit digital brightness control and synchronized blinking across cascaded devices - used in set-top boxes, panel meters, and white goods.

For engineers reviewing the MAX6954ATL+ datasheet, MAX6954ATL+ pinout, MAX6954ATL+ application, or MAX6954ATL+ equivalent, this page delivers verified technical context, exact package mapping (40-pin TQFN-EP), validated pin functions (e.g., O0–O18 segment/digit drivers, P0–P4 GPIO/key-scan ports), confirmed operating range (−40°C to +125°C), and real alternative options with documented functional differences.

Technical Context

The MAX6954ATL+ implements a dual-plane digit register architecture (P0/P1) enabling synchronized segment blinking by alternating between planes on the blink clock edge. Its internal RC oscillator (4MHz typical with RSET=56kΩ/CSET=22pF) or external 1–8MHz clock drives multiplex timing and blink rate selection (fast: 0.5s period; slow: 1s period).

Segment current is set by a single external resistor at ISET, with slew-rate limited drivers (11mA/µs) reducing EMI; digit intensity is controlled per-digit via 4-bit PWM (16 steps, 1/16 to 15/16 peak current); and five GPIO pins support key-scan matrix configuration with automatic debouncing and IRQ assertion on valid key press.

Key Specifications

Pinout & Package

MAX6954ATL+ uses a 40-pin TQFN-EP package (6mm × 6mm, 0.5mm pitch) with exposed pad thermally connected to GND. The EP pad must be soldered to a large ground plane for thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED display driver applications.

Compared with MAX6955ATL+, the MAX6954ATL+ offers higher-speed SPI updates and native daisy-chaining, while TLC59284PWR lacks integrated fonts and key-scan - making MAX6954ATL+ the sole option for drop-in alphanumeric display + keypad integration in space-constrained industrial panels.

Availability

MAX6954ATL+ is available at Aetrix Electronics and suitable for set-top boxes, panel meters, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6954ATL+ 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.

The MAX6954 product line targets embedded HMI systems needing integrated LED display driving, key scanning, and low-power operation - specifically engineered for appliances, instrumentation, and consumer AV equipment with stringent EMI and thermal requirements.

FAQ

What is the maximum number of 7-segment digits the MAX6954ATL+ can drive?

The MAX6954ATL+ can drive up to 16 digits of 7-segment LED displays. This is achieved using its eight common-cathode digit drivers (CC0–CC7), each supporting two 7-segment digits (e.g., digit 0 and 0a). The digit-type register configures slot pairing, and the scan-limit register sets active digit count from 1 to 16 - all fully supported in the MAX6954ATL+'s 40-pin TQFN-EP package.

Does the MAX6954ATL+ support both common-anode and common-cathode LED displays?

The MAX6954ATL+ supports common-cathode LED displays only. Its O0–O7 outputs sink current from digit common cathodes, and O0–O18 outputs source current to segment anodes. It does not provide high-side switching for common-anode configurations. For common-anode displays, external high-side drivers or alternative ICs like the MAX6956 (common-anode variant) would be required - MAX6954ATL+ is strictly common-cathode optimized.

How is segment current set on the MAX6954ATL+?

Segment current on the MAX6954ATL+ is set by connecting an external resistor (RSET) between the ISET pin and GND. The value of RSET determines peak segment current - e.g., 5.6kΩ yields ~40mA per segment at 3.3V supply. The relationship is linear and specified in the datasheet's DC characteristics table; no calibration or trimming is needed, and the same resistor sets current for all segments and digits driven by the MAX6954ATL+.

Can the MAX6954ATL+ drive bicolor LED displays?

Yes, the MAX6954ATL+ supports bicolor LED displays. Each digit slot can drive one bicolor 14- or 16-segment digit (or two monocolor digits), with shared anode connections per slot. The device's digit-type register configures slot mapping, and its 104-character ASCII font includes symbols usable for dual-color status indication (e.g., red/green "ON/OFF"). Bicolor operation requires proper PCB layout to route common anodes and separate cathodes - fully supported in the MAX6954ATL+'s architecture.

What is the function of the OSC_OUT pin on the MAX6954ATL+?

The OSC_OUT pin on the MAX6954ATL+ provides a buffered copy of either the internal RC oscillator or the external clock applied to the OSC pin. It enables synchronization of blink timing across multiple MAX6954ATL+ devices - critical for consistent visual feedback in multi-display systems like rack-mounted test equipment. OSC_OUT remains active only outside shutdown mode and matches the frequency/phase of the selected clock source without loading the OSC node.