Analog Devices Inc./Maxim Integrated MAX6950EEE+T

Overview

The MAX6950EEE+T from Maxim Integrated is a 5-digit common-cathode LED display driver IC with SPI/QSPI/MICROWIRE-compatible serial interface, +2.7V to +5.5V operation, 26MHz max interface clock, digital brightness control (16-step PWM), and integrated hexadecimal decoder for digits 0–9 and A–F. It drives up to 40 discrete LEDs or five 7-segment numeric digits in industrial panel meters and set-top box front panels.

For engineers reviewing the MAX6950EEE+T datasheet, MAX6950EEE+T pinout, MAX6950EEE+T application, or MAX6950EEE+T equivalent, key selection factors include its -40°C to +85°C extended temperature range, QSOP-EP package with exposed pad, segment slew-rate limiting for EMI reduction, shutdown current of 75µA, and support for synchronized blinking across multiple drivers.

Technical Context

The MAX6950EEE+T implements a multiplexed display architecture using dual-plane SRAM (P0/P1) for blink-enabled digit data storage, with scan rate derived from internal RC oscillator (4MHz typical at V+ = 3.3V, RSET = 56kΩ, CSET = 27pF) or external 1–8MHz clock. Its 16-bit SPI interface uses CS-latched command/data framing with D15–D8 as address and D7–D0 as payload.

Digit and segment drivers operate in current-sink/source mode: DIGx pins sink up to 400mA total per digit (240–400mA typical), while SEGx pins source up to 50mA per segment (–30 to –50mA). Brightness is digitally controlled via 4-bit intensity register scaling peak current from 1/16 to 15/16 in 16 steps, with interdigit blanking fixed at 1/16 of cycle time.

Key Specifications

Pinout & Package

MAX6950EEE+T is housed in a 16-pin QSOP-EP (exposed pad) package measuring 4.9mm × 3.9mm × 1.5mm, with thermal pad electrically and thermally connected to GND for enhanced power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6951EEE+T and TM1650, the MAX6950EEE+T provides optimal balance of industrial temperature range, SPI compatibility, 5-digit precision, and hardware blink synchronization - making it the preferred choice for robust, medium-complexity LED interfaces where pin count and power efficiency matter.

Availability

MAX6950EEE+T is available at Aetrix Electronics and suitable for industrial panel meters, set-top box front panels, and white goods control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6950EEE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6950EEE+T belongs to Maxim's serial LED display driver product line, designed specifically to replace discrete LED driver solutions in space- and cost-constrained embedded systems requiring reliable, low-EMI, microprocessor-controlled numeric or bar-graph displays.

FAQ

What is the maximum number of digits the MAX6950EEE+T can drive?

The MAX6950EEE+T is a fixed 5-digit display driver, capable of driving up to five 7-segment numeric digits or 40 discrete LEDs. While the scan-limit register allows configuration for 1–5 digits, it cannot drive six or more digits - unlike the pin-compatible MAX6951EEE+T, which supports eight digits. The hardware lacks the additional digit drivers required beyond five.

Does the MAX6950EEE+T support both internal and external clock sources for display multiplexing?

Yes, the MAX6950EEE+T supports both clocking methods via the OSC pin: an internal RC oscillator (set by RSET and CSET, typically 4MHz) or an external TTL/CMOS clock (1–8MHz). When using the internal oscillator, RSET sets both peak segment current and oscillator frequency; external clocking decouples brightness control from timing, enabling precise blink synchronization across multiple MAX6950EEE+T devices.

How does the MAX6950EEE+T handle display blanking at power-up?

The MAX6950EEE+T blanks the display automatically at power-up by entering shutdown mode and resetting all control registers. The display remains off until the host MCU writes to the configuration register to clear the shutdown bit (S = 1) and configures intensity, scan limit, and digit data. This prevents random or ghost segments from appearing during system initialization.

Can the MAX6950EEE+T drive common-anode LED displays?

No, the MAX6950EEE+T is designed exclusively for common-cathode LED configurations. Its DIGx pins are current sinks (for digit cathodes), and SEGx pins are current sources (for segment anodes). Driving common-anode displays would require reversing current paths and is not supported by the internal architecture or pin functionality of the MAX6950EEE+T.

What is the purpose of the dual-plane SRAM (P0 and P1) in the MAX6950EEE+T?

The dual-plane SRAM enables hardware-managed blinking: P0 stores the base digit data, and P1 stores alternate data. When blink is enabled, the MAX6950EEE+T automatically alternates between reading P0 and P1 on successive blink cycles - eliminating MCU intervention. This architecture also supports peak-hold bar graphs (e.g., audio meters) where P0 holds instantaneous value and P1 holds peak value.