Datasheet MAX6951 (Analog Devices)

19-2227; Rev 2; 3/05
EVALUATION KIT AVAILABLE Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers MAX6950/MAX6951 General Description Features
The MAX6950/MAX6951 are compact common-cathode ♦
High-speed 26MHz SPI-, QSPI-, MICROWIRE-
display drivers that interface microprocessors to individ-
Compatible Serial Interface
ual 7-segment numeric LED digits, bar graph, or discrete LEDs through an SPI™-, QSPI™-, MICROWIRE™-com- ♦
+2.7V to +5.5V Operation
patible serial interface. The supply voltage can be as low ♦
Individual LED Segment Control
as 2.7V. ♦
Segment Blinking Control that Can Be
The MAX6950 drives up to five 7-segment digits or 40 discrete LEDs. The MAX6951 drives up to eight 7-seg-
Synchronized Across Multiple Drivers
ment digits or 64 discrete LEDs. ♦
Hexadecimal Decode/No-Decode Digit Selection
Included on-chip are hexadecimal character decoders ♦
Digital Brightness Control
(0–9, A–F), multiplex scan circuitry, segment and digit drivers, and a static RAM that stores each digit. The ♦
Display Blanked on Power-Up
user may select hexadecimal decoding or no-decode ♦
Drives Common-Cathode LED Digits
for each digit to allow any mix of 7-segment digits, bar graph, or discrete LEDs to be driven. The segment cur- ♦
Multiplex Clock Syncronizable to External Clock
rent for the LEDs is set by an internal digital brightness ♦
Slew-Rate Limited Segment Drivers for Low EMI
control. The segment drivers are slew-rate limited to reduce EMI. ♦
75µA Low-Power Shutdown (Data Retained)
Individual digits may be addressed and updated with- ♦
Small 16-Pin QSOP Package
out rewriting the entire display. The devices include a low-power shutdown mode, digital brightness control, a scan-limit register that allows the user to display from one to eight digits, segment blinking that can be syn- chronized across drivers, and a test mode that forces
Ordering Information
all LEDs on.
PART TEMP RANGE PIN-PACKAGE Applications MAX6950
CEE 0°C to +70°C 16 QSOP-EP* MAX6950EEE -40°C to +85°C 16 QSOP-EP* Set-Top Boxes
MAX6951
CEE 0°C to +70°C 16 QSOP-EP* Panel Meters MAX6951EEE -40°C to +85°C 16 QSOP-EP* White Goods *EP = Exposed pad. Bar Graphs and Matrix Displays Industrial Controllers and Instrumentation Professional Audio Equipment
Pin Configuration
Medical Equipment TOP VIEW DIN 1 16 V+ CLK 2 15 CS
Functional Diagram appears at end of data sheet.
DIG3/SEG3 3 14 DIG4/SEG4
Typical Application appears at end of data sheet.
DIG2/SEG2 4 MAX6950 13 (DIG5)/SEG5 MAX6951 DIG1/SEG1 5 12 (DIG6)/SEG6 SPI and QSPI are trademarks of Motorola, Inc. DIG0/SEG0 6 11 (DIG7)/SEG7 MICROWIRE is a trademark of National Semiconductor Corp. ISET 7 10 SEG8 GND 8 9 OSC
QSOP
( ) MAX6951 ONLY
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