TLC59461 Datasheet, PDF (21/33 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction

TLC59461
www.ti.com............................................................................................................................................... SLVS896A – NOVEMBER 2008 – REVISED MARCH 2009
SERIAL INTERFACE MODE
The serial interface has two input modes defined by the MODE pin, as Table 3 shows. XLAT must be low when
the MODE pin goes high-to-low or low-to-high to change back and forth between GS mode and DC mode.
MODE
GND
VCC
Table 3. Serial Interface Input Mode
INPUT MODE
Grayscale PWM data
Dot correction data
INPUT SHIFT REGISTER
192 bits
96 bits
SCLK AND GSCLK FREQUENCY
Figure 31 shows a cascading connection of n TLC59461 devices connected to a single controller, building a
basic module of an LED display system. There is no limitation to the maximum number of ICs that can be
cascaded. However, the maximum number of cascading TLC59461 devices depends on the application system
and is in the range of 40 devices. Equation 4 and Equation 5 show the minimum frequencies for GSCLK and
SCLK.
f = 4096 f
GSCLK
´ _UPDATE
(4)
f_SCLK = 192 ´ f_UPDATE ´ n
(5)
where:
• f_GSCLK = minimum frequency of GSCLK
• f_SCLK = minimum frequency of SCLK
• f_UPDATE = update rate of entire cascading system
• n = number of cascaded TLC59461 devices
V_LED
V_LED
V_CC
¼
¼
V_LED
V_LED
¼
Controller
OUT
XERR
SCLK
XLAT
MODE
BLANK
GSCLK
IN
R_IREF
¼ _OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC59461
MODE
IC1
V_CC
BLANK
VCC
GSCLK
XHALF
IREF
GND
R_IREF
¼ _OUT0
OUT15
SIN
SOUT
XERR
SCLK
XLAT TLC59461
MODE
ICn
V_CC
BLANK
VCC
GSCLK
XHALF
IREF
GND
6
Figure 31. Cascading Device Connections
Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TLC59461
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