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| TLC5940 Datasheet, PDF (17/29 Pages) Texas Instruments – 16 CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL | |||
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TLC5940
www.ti.com
SLVS515A â DECEMBER 2004 â REVISED AUGUST 2005
SERIAL DATA TRANSFER RATE
Figure 14 shows a cascading connection of n TLC5940 devices connected to a controller, building a basic
module of an LED display system. The maximum number of cascading TLC5940 devices depends on the
application system and is in the range of 40 devices. Equation 5 calculates the minimum frequency needed:
f(GSCLK) + 4096 f(update)
f(SCLK) + 193 f(update) n
(5)
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 TLC5940 device
APPLICATION EXAMPLE
VCC
V(LED)
V(LED)
V(LED)
V(LED)
Controller
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
SOUT
W_EEPROM
VPRG_D
VPRG_OE
100 k
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
VPRG
OUT0
TLC5940
IC 0
7
OUT15
SOUT
VCC
100 nF
IREF
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
VPRG
OUT0
TLC5940
IC n
OUT15
SOUT
VCC
100 nF
IREF
V(22V)
50 k
50 k
50 k
50 k
V(22V)
50 k
50 k
VPRG
Figure 14. Cascading Devices
17
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