MAX6954 Datasheet | Maxim Integrated

Description The MAX6954 is a pact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an SPI-/ QSPI™-patible 4-wire serial interface. The serial interface may be cascaded through multiple devices. The MAX6954 drives up to 16 digits 7-segment, 8 digits 14-segment, 8 digits 16-segment, or 128 discrete LEDs, while functioning from a supply voltage as low as 2.7V. The driver includes five I/O expander (or GPIO) lines, some or all of which may be configured as a key-switch reader, which automatically scans and debounces a matrix of up to 32 switches. Included on chip are full 14- and 16-segment ASCII 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit. The maximum segment current for the display digits is set using a single external resistor. Digit intensity can be independently adjusted using the 16-step internal digital brightness control. The MAX6954 includes a low-power shutdown mode, a scan-limit register that allows the user to display from 1 to 16 digits, segment blinking (synchronized across multiple drivers, if desired), and a test mode, which forces all LEDs on. The LED drivers are slew-rate limited to reduce EMI. For a 2-wire interfaced version, refer to the MAX6955 data sheet. An evaluation kit (EV kit) for the MAX6955 is available. Applications - - Set-Top Boxes - - Panel Meters - - White Goods - - Bar Graph Displays - - Audio/Video Equipment Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6954AAX -40°C to +125°C 36 SSOP MAX6954APL -40°C to +125°C 40 PDIP MAX6954ATL+ -40°C to +125°C 40 TQFN-EP- +Denotes a lead-free/Ro HS-pliant package. - EP = Exposed pad. QSPI is a trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. Features - - High-Speed 26MHz SPI/QSPI/MICROWIRE®patible Serial Interface - - 2.7V to 5.5V Operation - - Drives Up to 16...