TLC59401 Datasheet, PDF (13/29 Pages) Texas Instruments – 16-CHANNEL LED DRIVER WITH DOT CORRECTION AND GRAYSCALE PWM CONTROL

TLC59401
www.ti.com
SBVS137 – DECEMBER 2009
MODE
XLAT
DCb
SIN(a) MSB
DCa
LSB
GSb1
MSB
SCLK ¹
SOUT(b)
BLANK
192
96X2
-
DCb
MSB
1
-
-
GSa1
LSB
384
192X2
GSb1
MSB
GSb2
MSB
385
1
SIDb1 SIDb1
MSB MSB-1
GSa2
LSB
384
SIDa1 GSb2
LSB MSB
GSb3
MSB
385
1
SIDb2 SIDb2
MSB MSB-1
GSCLK
OUT0
(current)
OUT1
(current)
OUT15
(current)
XERR
1
4096
1
Figure 14. Timing Chart for Two Cascaded TLC59401 Devices
ERROR INFORMATION OUTPUT
The open-drain output XERR is used to report both of the TLC59401 error flags, TEF and LOD. During normal
operation, the internal transistor connected to the XERR pin is turned off. The voltage on XERR is pulled up to
V_CC through an external pull-up 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
V_CC with a single pull-up resistor. This capability reduces the number of signals needed to report a system error
(see Figure 22).
To differentiate the LOD and TEF signal from the XERR pin, LOD can be masked out with BLANK pulled high.
Table 2. XERR Truth Table
ERROR CONDITION
TEMPERATURE
OUTn VOLTAGE
T_J < T_(TEF)
T_J > T_(TEF)
T_J < T_(TEF)
T_J > T_(TEF)
Don't care
Don't care
OUTn > V_(LED)
OUTn < V_(LED)
OUTn > V_(LED)
OUTn < V_(LED)
ERROR INFORMATION
TEF
LOD
Low
X
High
X
Low
Low
Low
High
High
Low
High
High
SIGNALS
BLANK
XERR
High
High
Low
High
Low
Low
Low
Low
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TLC59401
Submit Documentation Feedback
13