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CXA2108AQ

Constant-Current Driver for Full Color LED Display

Sony Semiconductor 

CXA2108AQ

Constant-Current Driver for Full Color LED Display

Description

The CXA2108AQ is a 1,024-gradation LED driver

which is ideal for full color LED displays. This IC has

24 outputs and a maximum output current of 70mA.

Time division allows driving of either two or six LEDs

per output by connecting an external FET or other

switch. The luminance (PWM) and drive current for

each LED are set using the internal RAM. The LED

type is common anode.

80 pin QFP (Plastic)

Features

• 24 outputs: 10-bit (1,024-gradation) PWM current outputs

• Maximum output current: 70mA

• LED type: Common anode

• 4-bit brightness function capable of switching the basic PWM pulse width in 16 steps

• Time division allows driving of up to six LEDs with a single output, making it possible to configure a high

definition display with few driver ICs.

• Coarse Adj. (2 bits) and Fine Adj. (8 bits) output current adjustment for each LED makes it possible to drive

R, G and B using the same output from the same IC. In addition, the characteristics variance of each LED

can also be corrected.

• All luminance (PWM) data and drive current data are set by writing to the internal RAM.

• PWM emitting can be performed up to 15 times per frame to realize a screen with little flicker.

• Two built-in PWM data RAM make it possible to set the next luminance data even during PWM operation.

• Abnormal internal temperature detection circuit

• Single 5V power supply

• Current output with protection diode (diode cathode voltage: VPD can be supplied independently of the 5V

power supply.)

• Surface mounting package (80-pin QFP)

Applications

LED display panels

Structure

Bi-CMOS silicon monolithic IC

Absolute Maximum Ratings (Ta = 25°C)

• Supply voltage

AVCC, DVCC

–0.3 to +6.0

V

VPD

–0.3 to +10.5

V

• Digital input voltage

VI_D

–0.3 to DVCC + 0.3

V

• Digital output current

Io_D

–5.0 to +5.0

mA

• Driver output voltage

V_DVR

0 to VPD + 0.3

V

• Driver output current

• Operating temperature∗1

I_DVR

Topr

–1 to +80

mA

–40 to +80

°C

• Storage temperature

Tstg

• Allowable power dissipation∗1 (Ta = 65°C or less) PD

–65 to +150

°C

1.5

W

Recommended Operating Range

• Supply voltage

AVCC, DVCC

4.75 to 5.25

V

VPD

AVCC to 10

V

• Driver output compliance voltage

Vcmp

1.0 to VPD + 0.3

V

• Operating temperature (ambient temperature)∗1 Ta

• Operating temperature (case temperature)∗1

Tc

(I_DVR = 0 to 70mA)

–20 to +65

°C

–20 to +110

°C

∗1 When mounted on a printed circuit board

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by

any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the

operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

–1–

E99160-PS

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