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A6280 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A6280
Description  3 Bit Constant Current LED Driver with PWM Control
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A6280 Datasheet(HTML) 1 Page - Allegro MicroSystems

 
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Description
TheA6280 is a 3 bit constant current LED driver that has a wide
range of output currents. The A6280 controls LED luminance
with a pulse width modulation (PWM) scheme that gives the
application the capability of displaying a billion colors. The
overall maximum current is set by an external resistor.
The LED luminance is controlled by performing PWM control
on the outputs. The luminance data of the PWM signal for each
LED is stored in three 10 bit registers. Each LED can be dot
corrected by a 7 bit scalar register that scales the maximum
current from 100% down to 36.5%. All the internal latched
registers are loaded by a 31 bit serial shift register. One bit is used
to control the type of data loaded into the registers, either dot
correction/clockdividerratioorluminancedata.Theremaining
30 bits are used for the data. This helps reduce the pin count
of the A6280. To further lower the A6280 pin count, the PWM
clock and the serial bus clock share the same pin and work
concurrently to control LED luminance and to load data.
TheA6280 is designed to minimize the number of components
needed to drive LEDs with large pixel spacing. SeveralA6280s
can be daisy chained together and controlled by just four control
signals (Clock, Serial Data, Latch, and Output Enable). Each
of these inputs has buffered outputs on chip. Also, the VIN pin
A6280-DS, Rev. 1
Features and Benefits
▪ 5 to 17 V operation
▪ Wide output current range (10 to 150 mA per output)
▪ 3 × 7 bit Dot Correction current settings
▪ 31 bit shift register
▪ 3 ×10 bit PWM luminance settings
▪ Buffered output control pins
▪ Up to 5 MHz serial / PWM clock frequency
▪ Thermal Shutdown / UVLO
3 Bit Constant Current LED Driver with PWM Control
Continued on the next page…
Packages: 16 pin DIP (suffix A), and
16 pin QFN/MLP (suffix ES)
Application Diagram
ES, approximate scale 1:1
A6280
Clock
Data
Strobe
Output Enable
Microprocessor
Control Board
Clock Out
Data Out
Strobe Out
OE Out
Clock In
Data In
Strobe In
OE In
VLED
OutB
OutG
OutR
VIN
Power Supply Bus
A6280
Pixel Board #1
REXT
VREG
Clock Out
Data Out
Strobe Out
OE Out
Clock In
Data In
Strobe In
OE In
VLED
OutB
OutG
OutR
VIN
A6280
Pixel Board #2
REXT
VREG
Pixel Board #N
Cat5 UTP
Cat5 UTP
Cat5 UTP
Figure 1. Functional drawing of daisy chained display application. Additional pixel boards
with A6280 ICs can be applied.


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