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t

pd2

t

pd2

VUP

Pre-chargePeriod

ON

CurrentON

OFF

BLANK

OUT0

OUT14

OUT15

ON

OFF

t x14

d

t x14

d

VUP: Pre-Charge Power Supply

VUP

VUP

TLC5924

Pre-ChargePowerSupply

Serial Interface Data Transfer Rate

TLC5924

SLVS626 – JUNE 2006

Figure 9. Timing Chart of BLANK and OUTn

(On/Off Data Condition: OUT0=H, OUT14=H, OUT15=L)

VUP is a pre-charge power supply terminal. The pre-charge voltage should be supplied to this terminal for

normal operation. When VUP terminal is open, TLC5924 keeps OUT0-15 open. TLC5924 has two VUP pins as

shown in the Terminal Functions Table. Both VUP pins should be connected to the pre-charge power supply as

shown in Figure 10.

Figure 10. VUP Power Supply

The TLC5924 includes a flexible serial interface, which can be connected to a microcontroller or digital signal

processor. Only 3 pins are required to input data into the device. The rising edge of SCLK signal shifts the data

from SIN pin to internal shift register. After all data is clocked in, a rising edge of XLAT latches the serial data to

the internal registers. All data is clocked in with MSB first. Multiple TLC5924 devices can be cascaded by

connecting SOUT pin of one device with SIN pin of following device. The SOUT pin can also be connected to

controller to receive LOD information from TLC5924.

10

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