TLC5940 Datasheet, PDF (14/29 Pages) Texas Instruments – 16 CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL

TLC5940
SLVS515A – DECEMBER 2004 – REVISED AUGUST 2005
www.ti.com
LSB
0
5
6
DC 0.0
DC 0.5 DC 1.0
DC OUT0
DC OUT2 − DC OUT14
79
90
MSB
95
DC 14.5 DC 15.0
DC 15.5
DC OUT15
Figure 7. Dot Correction Data Packet Format
To input data into the dot correction register, VPRG must be set to V_CC. The internal input shift register is then
set to 96-bit width. After all serial data are clocked in, a rising edge of XLAT is used to latch the data into the dot
correction register. Figure 8 shows the dc data input timing chart.
DC Mode Data
Input Cycle n
V_CC
DC Mode Data
Input Cycle n+1
MODE
DC n
DC n
DC n
SIN
MSB
MSB−1 MSB−2
DC n
LSB+1
DC n
LSB
DC n+1
MSB
DC n+1
MSB−1
SCLK
SOUT
t_wh0
1
2
3
DC n−1
MSB
DC n−1
MSB−1
t_wl0
DC n−1
MSB−2
XLAT
95
96
DC n−1 DC n−1
LSB+1
LSB
t_su1
DC n
MSB
t_wh2
t_h1
1
2
DC n
DC n
MSB−1 MSB−2
Figure 8. Dot Correction Data Input Timing Chart
The TLC5940 has also an EEPROM to store dot correction data. To store data from the dot correction register to
EEPROM, DCPRG is set to high after applying V_PRG to VPRG pin. Figure 9 shows the EEPROM programming
timings.
VPRG
0 V or V_CC
t_su5
DC EEPROM Write Timing
V(PRG)
t_prog
t_h5
DCPRG
Figure 9. EEPROM Programming Timing Chart
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