MAX6954APL

Product Summary

The max6954apl is a compact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an SPI-or QSPI-compatible 4-wire serial interface. The serial interface may be cascaded through multiple devices. The max6954apl 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 or which may be configured as a keyswitch 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 max6954apl 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.

Parametrics

max6954apl absolute maximum ratings: (1)Voltage (with Respect to GND)V+: -0.3V to +6V; (2)All Other Pins: -0.3V to (V+ + 0.3V); (3)Current O0–O7 Sink Current: 935mA; (4)GND: 1A; (5)Continuous Power Dissipation (TA = +70°C) 36-Pin SSOP (derate at 11.8mW/°C above +70°C): 941mW; (6)Operating Temperature Range (TMIN to TMAX): -40°C to +125°C; (7)Junction Temperature: +150°C; (8)Storage Temperature Range: -65°C to +150°C; (9)Lead Temperature (soldering, 10s): +300°C.

Features

max6954apl features: (1)high-speed 26mhz spi/qspi/microwire compatible serial interface; (2)2.7V to 5.5V operation; (3)drives up to 16 digits 7-segment, 8 digits 14-segment, 8 digits 16-segment, 128 discrete leds, or a combination of digit types; (4)drives common-cathode monocolor and bicolor led displays; (5)built-in ASCII 104-Character font for 14-segment and 16-segment digits and hexadecimal font for 7-segment digits; (6)automatic blinking control for each segment; (7)10μA (typ) low-power shutdown (data retained); (8)16-step digit-by-digit digital brightness control ; (9)display blanked on power-up; (10)slew-rate limited segment drivers for lower EMI; (11)five gpio port pins can be configured as keyswitch reader to scan and debounce up to 32 switches with n-key rollover; (12)36-Pin SSOP and 40-Pin DIP packages; (13)automotive temperature range standard.

Diagrams