MAX6955 2-Wire Interfaced, 2.7V To 5.5V LED Display Driver With I/O Expander And Key Scan
The MAX6955 is a compact Display driver that Interfaces Microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED Displays through an IC-compatible 2-wire serial Interface The MAX6955 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 general-purpose I/O (GPIO) lines, some or all of which CAN be configured as a key-switch reader. The key-switch reader 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 MAX6955 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 an SPI"-compatible version, refer to the MAX6954 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.
By Maxim Integrated Products
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