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TLC5945 Datasheet(PDF) 17 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) 17 Page - Texas Instruments

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X
X
TEF
X
X
DC0.0
DC15.5
LOD0
LOD15
191
120
119
24
23
16
15
0
LSB
MSB
Reserved
TEF
DCValues
LODData
MODE
XLAT
SIN
SCLK
SOUT
BLANK
GSCLK
OUT0
(current)
OUT1
(current)
OUT15
(current)
XERR
1
192
193
1
192
1
4096
GS1
MSB
GS1
LSB
GS1
MSB
GS2
MSB
GS2
LSB
GS2
MSB
SID1
MSB
SID1
MSB-1
SID1
LSB
-
-
tpd2 + tpd3
tpd3
GSDataInputMode
1stGSDataInputCycle
2ndGSDataInputCycle
(1stGSDataOutputCycle)
tsuLOD
>t
+t
pd2
pd3
GRAYSCALE PWM OPERATION
TLC5945
SLVS755 – MARCH 2007
Figure 14. The next SCLK pulse, which will be the clock for receiving the MSB of the next grayscale data,
transmits MSB-1 of SID. If output voltage is < 0.3 V (typical) when the output sink current turns on, LOD status
flag becomes active. The LOD status flag is an internal signal which pulls XERR pin down to low when the LOD
status flag becomes active. The delay time, tpd2 (1
µs maximum), is from the time of turning on the output sink
current to the time LOD status flag becomes valid.
Figure 13. Status Information Data Packet Format
Figure 14. Readout Status Information Data (SID) Timing Chart
The grayscale PWM cycle starts with the falling edge of BLANK. The first GSCLK pulse after BLANK goes low
increases the grayscale counter by one and switches on all OUTn with grayscale value not zero. Each following
rising edge of GSCLK increases the grayscale counter by one. The TLC5945 compares the grayscale value of
17
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