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MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
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Status
Active: In Production.
Description
The MAX6954 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 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.
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Data Sheet
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Key Features
- High-Speed 26MHz SPI/QSPI/MICROWIRE™-Compatible Serial Interface
- 2.7V to 5.5V Operation
- Drives Up to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types
- Drives Common-Cathode Monocolor and Bicolor LED Displays
- Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits
- Automatic Blinking Control for each Segment
- 10µA (typ) Low-Power Shutdown (Data Retained)
- 16-Step Digit-by-Digit Digital Brightness Control
- Display Blanked on Power-Up
- Slew-Rate Limited Segment Drivers for Lower EMI
- Five GPIO Port Pins Can Be Configured as Key-Switch Reader to Scan and Debounce Up to 32 Switches with n-Key Rollover
- IRQ Output when a Key Input Is Debounced
- 36-Pin SSOP and 40-Pin DIP and TQFN Packages
- Automotive Temperature Range Standard
- Underwriters Laboratories (UL) Recognized
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Applications/Uses
- Audio/Video Equipment
- Automotive Electronics
- Bar Graph Displays
- Panel Meters
- Set-Top Boxes
- White Goods
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Key Specifications:
| Display Drivers |
| Part Number |
LCD or LED |
Display Type |
Interface |
Fonts |
Segment Blinking |
VSUPPLY
(V) |
VSUPPLY
(V) |
Budgetary Price |
| min |
max |
See Notes |
| MAX6954 |
LED |
Common Cathode |
Serial SPI 26Mbit |
| 104 char ASCII | | Hexadecimal |
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Yes |
2.7 |
5.5 |
$9.10 @1k |
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See All Display Drivers (52)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX6954AAX
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Active |
SSOP;36 pin;163.4 mm²
Outline Drawing:21-0040 (PDF)
Land Pattern: 90-0098 (PDF)
Use pkgcode/variation: A36-2*
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-40°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX6954AAX+
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Active |
SSOP;36 pin;163.4 mm²
Outline Drawing:21-0040 (PDF)
Land Pattern: 90-0098 (PDF)
Use pkgcode/variation: A36+2*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX6954AAX+T
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Active |
SSOP;36 pin;163.4 mm²
Outline Drawing:21-0040 (PDF)
Land Pattern: 90-0098 (PDF)
Use pkgcode/variation: A36+2*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX6954AAX-T
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Active |
SSOP;36 pin
Land Pattern: Not Available
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-40°C to +125°C
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See data sheet
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| MAX6954APL
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Active |
PDIP(W);40 pin;836.5 mm²
Outline Drawing:21-0044 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P40-2*
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-40°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX6954APL+
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Active |
PDIP(W);40 pin;836.5 mm²
Outline Drawing:21-0044 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P40+2*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX6954ATL
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Active |
TQFN;40 pin;37.2 mm²
Outline Drawing:21-0141 (PDF)
Land Pattern: 90-0055 (PDF)
Use pkgcode/variation: T4066-5*
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-40°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX6954ATL+
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Active |
TQFN;40 pin;37.2 mm²
Outline Drawing:21-0141 (PDF)
Land Pattern: 90-0055 (PDF)
Use pkgcode/variation: T4066+5*
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-40°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX6954ATL+T
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Active |
QFN;40 pin
Land Pattern: Not Available
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-40°C to +125°C
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See data sheet
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| MAX6954ATL-T
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Active |
QFN;40 pin
Land Pattern: Not Available
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-40°C to +125°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
| MAX7219, MAX7221 |
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| MAX6950, MAX6951 |
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| MAX6953 |
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver |
| MAX6957 |
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander |
| MAX6952 |
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver |
| MAX6956 |
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander |
| MAX6955 |
2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan |
| MAX6958, MAX6959 |
2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan |
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More Information
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Information Index
Document Ref.: 19-2419
Rev 34;
2009-04-14
This page last modified: 2009-04-14
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