Ver1.0

32

LD1072

16-CH LED DRIVER WITH DOT CORRECTION AND 12-BIT PWM CONTROL

SERIAL DATA TRANSFER RATE

Figure 29 shows a cascading connection of n LD1072 devices connected to a controller, building a basic module of

an LED display system. There is no LD1072 limitation to the maximum number of ICs that can be cascaded. The

maximum number of cascading LD1072 devices depends on the application system and is in the range of 40 devices.

Equation 12 calculates the minimum frequency needed:

f

(PWMCK) = 4096 x f (update)

(12)

f

(CLK) = 193 x f (update) x n

f(PWMCK): minimum frequency needed for PWMCK f(CLK): minimum frequency needed for CLK and DIN

f(update): update rate of whole cascading system n: number cascaded of LD1072 device

APPLICATION EXAMPLE

Figure 29. Cascading Devices

DIN

ERR

CLK

ST

PWMCK

MOD

Controller

OEB

DO

100 k

DC

DIN

ERR

CLK

ST

PWMCK

MOD

OEB

OUT0

OUT15

DO

100 nF

LD1072

REXT

IC 0

6

DC

DIN

ERR

CLK

ST

PWMCK

MOD

OEB

OUT0

OUT15

DO

100 nF

LD1072

REXT

IC n

V

(LED)

VDD

V

(LED)

V

(LED)

V

(LED)

VDD

VDD

VDD

VDD