MAX6951 Datasheet

• High-speed 26MHz SPI-, QSPI-, MICROWIRE-Compatible Serial Interface
• +2.7V to +5.5V Operation
• Individual LED Segment Control
• Segment Blinking Control that Can Be Synchronized Across Multiple Drivers
• Hexadecimal Decode/No-Decode Digit Selection
• Digital Brightness Control
• Display Blanked on Power-Up
• Drives Common-Cathode LED Digits
• Multiplex Clock Syncronizable to External Clock
• Slew-Rate Limited Segment Drivers for Low EMI
• 75µA Low-Power Shutdown (Data Retained)
• Small 16-Pin QSOP Package

• Bar Graphs and Matrix Displays
• Industrial Controllers and Instrumentation
• Medical Equipment
• Panel Meters
• Professional Audio Equipment
• Set-Top Boxes
• White Goods

The MAX6951 are compact common-cathode display drivers that interface microprocessors to individual 7-segment numeric LED digits, bar graph, or discrete LEDs through an SPI™-, QSPI™-, MICROWIRE™-compatible serial interface. The supply voltage can be as low as 2.7V.

The MAX6951 drives up to eight 7-segment digits or 64 discrete LEDs.

Included on-chip are hexadecimal character decoders (0-9, A-F), multiplex scan circuitry, segment and digit drivers, and a static RAM that stores each digit. The user may select hexadecimal decoding or no-decode for each digit to allow any mix of 7-segment digits, bar graph, or discrete LEDs to be driven. The segment current for the LEDs is set by an internal digital brightness control. The segment drivers are slew-rate limited to reduce EMI.

Individual digits may be addressed and updated without rewriting the entire display. The devices include a low-power shutdown mode, digital brightness control, a scan-limit register that allows the user to display from one to eight digits, segment blinking that can be synchronized across drivers, and a test mode that forces all LEDs on.