CAT310

http://onsemi.com

8

Figure 13. Timing Diagram

SCLK

SIN

SOUT

XLAT

BLANK

OUTn

Output Switch OFF

Output Switch ON

Application Information

For applications with a large number of LEDs, several

CAT310 drivers can be daisy chained. The serial data output

pin (SOUT) of the first driver is connected to the second

driver data input pin (SIN). This sequence is repeated until

the last driver is linked. All drivers are controlled by the

same clock signal. Figure 14 shows an example with three

CAT310 devices driving a total of 30 LEDs in parallel. The

controller transmits the serial data sequentially through the

CAT310 devices. For N drivers connected in cascade, after

10 x N clock pulses, the data are latched with one single

XLAT transition.

Figure 14. Daisy Chain Application Diagram

4.7 mF

5 V

BLANK

XLAT

SOUT

GND PGND

VCC

VBAT

OUT0

OUT1

OUT9

CAT310

CONTROLLER

SCLK

SIN

+

−

+

−

BLANK

XLAT

SOUT

VCC

VBAT

OUT0

OUT1

OUT9

CAT310

SCLK

SIN

BLANK

XLAT

SOUT

VCC

VBAT

OUT0

OUT1

OUT9

CAT310

SCLK

SIN

GND PGND

GND PGND