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TLC5945 Datasheet(PDF) 18 Page - Texas Instruments

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Part No. TLC5945
Description  16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TLC5945 Datasheet(HTML) 18 Page - Texas Instruments

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GSCLK
BLANK
GSPWM
Cyclen
1
2
3
1
GSPWM
Cyclen+1
OUT0
OUT1
OUT15
XERR
tpd1
tpd2
tpd3
twh1
twl1
twl1
tpd3
4096
th4
twh3
tsu4
(Current)
(Current)
(Current)
tpd3
SERIAL DATA TRANSFER RATE
f
(GSCLK) +
4096
f
(update)
f
(SCLK) +
193
f
(update)
n
(10)
TLC5945
SLVS755 – MARCH 2007
each output OUTn with the grayscale counter value. All OUTn with grayscale values equal to the counter values
are switched off. A BLANK=H signal after 4096 GSCLK pulses resets the grayscale counter to zero and
completes the grayscale PWM cycle (see Figure 15). When the counter reaches a count of FFFh, the counter
stops counting and all outputs turn off. Pulling BLANK high before the counter reaches FFFh immediately resets
the counter to zero.
Figure 15. Grayscale PWM Cycle Timing Chart
Figure 16 shows a cascading connection of n TLC5945 devices connected to a controller, building a basic
module of an LED display system. There is no TLC5945 limitation to the maximum number of ICs that can be
cascaded. The maximum number of cascading TLC5945 devices depends on the application system and is in
the range of 40 devices. Equation 10 calculates the minimum frequency needed:
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 TLC5945 device
18
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