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| TLC5941_16 Datasheet, PDF (23/34 Pages) Texas Instruments – 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL | |||
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TLC5941
www.ti.com
SLVS589D â JULY 2005 â REVISED JANUARY 2008
SERIAL DATA TRANSFER RATE
Figure 22 shows a cascading connection of n TLC5941 devices connected to a controller, building a basic
module of an LED display system. There is no TLC5941 limitation to the maximum number of ICs that can be
cascaded. The maximum number of cascading TLC5941 devices depends on the application system and is in
the range of 40 devices. Equation 11 calculates the minimum frequency needed:
f(GSCLK) + 4096 f(update)
f(SCLK) + 193 f(update) n
(11)
where:
f(GSCLK): minimum frequency needed for GSCLK
f(SCLK): minimum frequency needed for SCLK and SIN
f(update): update rate of whole cascading system
n: number cascaded of TLC5941 device
Application Example
VCC
V(LED)
V(LED)
V(LED)
V(LED)
Controller
SIN
XERR
SCLK
XLAT
GSCLK
MODE
BLANK
SOUT
100 k
VCC
SIN
XERR
SCLK
XLAT
GSCLK
MODE
BLANK
TEST
OUT0
TLC5941
IC 0
6
OUT15
SOUT
VCC
100 nF
IREF
VCC
SIN
XERR
SCLK
XLAT
GSCLK
MODE
BLANK
TEST
OUT0
TLC5941
IC n
OUT15
SOUT
VCC
100 nF
IREF
Figure 22. Cascading Devices
Copyright © 2005â2008, Texas Instruments Incorporated
Product Folder Link(s): TLC5941
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