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| TLC5923_16 Datasheet, PDF (10/28 Pages) Texas Instruments – 16-CHANNEL LED DRIVER WITH DOT CORRECTION | |||
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TLC5923
SLVS550B â DECEMBER 2004 â REVISED JANUARY 2013
VCC
V(LED)
V(LED)
Controller
SIN
XERR
SCLK
XLAT
MODE
BLANK
SOUT
100 k
SIN
XERR
SCLK
XLAT
MODE
BLANK
OUT0
TLC5923
OUT15
SOUT
VCC
100 nF
IREF
IC 0
5
V(LED)
www.ti.com
V(LED)
SIN
XERR
SCLK
XLAT
MODE
BLANK
OUT0
TLC5923
OUT15
SOUT
VCC
100 nF
IREF
IC n
Figure 9. Cascading Devices
Figure 9 shows a example application with n cascaded TLC5923 devices connected to a controller. The
maximum number of cascaded TLC5923 devices depends on application system and data transfer rate.
Equation 3 calculates the minimum data input frequency needed.
f_(SCLK) + 112 f_(update) n
(3)
where:
f_(SCLK): The minimum data input frequency for SCLK and SIN.
f_(update): The update rate of the whole cascaded system.
n: The number of cascaded TLC5923 devices.
Operating Modes
The TLC5923 has different operating modes depending on MODE signal. Table 2 shows the available operating
modes. The values in the input shift registers, DC register and On/Off register are unknown just after power on.
The DC and On/Off register values should be properly stored through the serial interface before starting the
operation.
Table 2. TLC5923 Operating Modes Truth Table
MODE SIGNAL
LOW
HIGH
INPUT SHIFT REGISTER
16 bit
112 bit
MODE
On/Off Mode
Dot Correction Data Input Mode
10
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