Part # MAX6954 datasheet

Part Manufacturer: Maxim


Part Description: MAX6954 DS

Part Details:

19-2460; Rev 3; 6/08 4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan MAX6954 General Description Features The MAX6954 is a compact display driver that inter- High-Speed 26MHz SPI/QSPI/MICROWIRETM- faces microprocessors to a mix of 7-segment, 14-seg- Compatible Serial Interface ment, and 16-segment LED displays through an SPITM- 2.7V to 5.5V Operation or QSPITM-compatible 4-wire serial interface. The serialinterface may be cascaded through multiple devices. Drives Up to 16 Digits 7-Segment, 8 Digits The MAX6954 drives up to 16 digits 7-segment, 8 digits 14-Segment, 8 Digits 16-Segment, 128 Discrete 14-segment, 8 digits 16-segment, or 128 discrete LEDs, or a Combination of Digit Types LEDs, while functioning from a supply voltage as low as Drives Common-Cathode Monocolor and Bicolor 2.7V. The driver includes five I/O expander (or GPIO) LED Displays lines, some or all or which may be configured as a key-switch reader, which automatically scans and Built-In ASCII 104-Character Font for 14-Segment debounces a matrix of up to 32 switches. and 16-Segment Digits and Hexadecimal Font for Included on chip are full 14- and 16-segment ASCII 7-Segment Digits 104-character fonts, a hexadecimal font for 7-segment Automatic Blinking Control for each Segment displays, multiplex scan circuitry, anode and cathode 10µA (typ) Low-Power Shutdown (Data Retained) drivers, and static RAM that stores each digit. The max-imum segment current for the display digits is set using 16-Step Digit-by-Digit Digital Brightness Control a single external resistor. Digit intensity can be inde- Display Blanked on Power-Up pendently adjusted using the 16-step internal digital Slew-Rate Limited Segment Drivers for Lower EMI brightness control. The MAX6954 includes a low-powershutdown mode, a scan-limit register that allows the Five GPIO Port Pins Can Be Configured as Key- user to display from 1 to 16 digits, segment blinking Switch Reader to Scan and Debounce Up to 32 (synchronized across multiple drivers, if desired), and a Switches with n-Key Rollover test mode, which forces all LEDs on. The LED drivers IRQ Output when a Key Input Is Debounced are slew-rate limited to reduce EMI. 36-Pin SSOP and 40-Pin DIP and TQFN Packages For a 2-wire interfaced version, refer to the MAX6955data sheet. An evaluation kit (EV kit) for the MAX6955 is Automotive Temperature Range Standard available. Functional Diagram Applications Set-Top Boxes Automotive

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MAX6954.pdf Datasheet