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TLC5945 Datasheet(PDF) 12 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) 12 Page - Texas Instruments

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MODE
XLAT
SIN(a)
SCLK
SOUT(b)
BLANK
GSCLK
OUT0
(current)
OUT1
(current)
OUT15
(current)
XERR
1
192X2
DCb
MSB
DCa
LSB
DCb
MSB
1
384
385
1
384
385
1
1
4096
1
GSb1
MSB
GSa1
LSB
GSb1
MSB
GSb2
MSB
GSa2
LSB
GSb2
MSB
SIDb2
MSB
SIDb2
MSB-1
SIDb1
MSB
SIDb1
MSB-1
SIDa1
LSB
GSb3
MSB
-
-
-
192
96X2
ERROR INFORMATION OUTPUT
TLC5945
SLVS755 – MARCH 2007
PRINCIPLES OF OPERATION (continued)
Figure 8. Timing Chart for Two Cascaded TLC5945 Devices
The open-drain output XERR is used to report both of the TLC5945 error flags, TEF and LOD. During normal
operating conditions, the internal transistor connected to the XERR pin is turned off. The voltage on XERR is
pulled up to VCC through an external pullup resistor. If TEF or LOD is detected, the internal transistor is turned
on, and XERR is pulled to GND. Because XERR is an open-drain output, multiple ICs can be ORed together
and pulled up to VCC with a single pullup resistor. This reduces the number of signals needed to report a system
error (see Figure 16).
To differentiate LOD and TEF signal from XERR pin, LOD can be masked out with BLANK = HIGH.
Table 2. XERR Truth Table
ERROR CONDITION
ERROR INFORMATION
SIGNALS
TEMPERATURE
OUTn VOLTAGE
TEF
LOD
BLANK
XERR
TJ < T(TEF)
Don't Care
L
X
H
H
TJ > T(TEF)
Don't Care
H
X
L
OUTn > V(LED)
L
L
H
TJ < T(TEF)
OUTn < V(LED)
L
H
L
L
OUTn > V(LED)
H
L
L
TJ > T(TEF)
OUTn < V(LED)
H
H
L
12
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