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| TLC5924 Datasheet, PDF (11/23 Pages) Texas Instruments – 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND PRE-CHARGE FET | |||
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Controller
SIN
XERR
SCLK
XLAT
MODE
BLANK
SOUT
VCC
V(LED)
V(LED)
100 k
SIN
XERR
SCLK
XLAT
MODE
BLANK
OUT0
TLC5924
OUT15
SOUT
VCC
100 nF
IREF
IC 0
5
V(LED)
TLC5924
SLVS626 â JUNE 2006
V(LED)
SIN
XERR
SCLK
XLAT
MODE
BLANK
OUT0
TLC5924
OUT15
SOUT
VCC
100 nF
IREF
IC n
Figure 11. Cascading Devices
Figure 11 shows a example application with n cascaded TLC5924 devices connected to a controller. The
maximum number of cascaded TLC5924 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 TLC5924 devices.
Operating Modes
The TLC5924 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. TLC5924 Operating Modes Truth Table
MODE SIGNAL
LOW
HIGH
INPUT SHIFT REGISTER
16 bit
112 bit
MODE
On/Off Mode
Dot Correction Data Input Mode
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