TLC5943_17 Datasheet, PDF (28/40 Pages) Texas Instruments – 16-Channel, 16-Bit PWM LED Driver with 7-Bit Global Brightness Control

TLC5943
SBVS101 – DECEMBER 2007
www.ti.com
Auto Output Off
If the active OUTn channel is not connected to an LED or if LED is shorted to GND, then V_CC consumption
current increases. In order to avoid this event, the device has an auto output off function. This function turns off
channel OUTn with a detected LED opening or LED shorting to GND at the 33rd GSCLK after BLANK goes low
automatically. V_CC current can be saved by this function. OUTn is controlled normally again after BLANK goes
low. Figure 32 illustrates the auto output off function.
VCC
Dissipation
Current
BLANK
GSCLK
1234
30 31 32 33 34 35
65,534 65,536
65,533 65,535
1 2 3 30 31 32 33 34 35
OFF
Voltage of
ON
OUTn
GND
V_OUTn
If LOD error is detected
If no LOD error is detected
SID Register Value
Old LED open detection data
(Internal)
ON Signal of OUTn
'ON'
(Internal) 'OFF'
(GS data = FFFFh)
New LED open detection data
Remain 'On' (if no
LOD error detected)
'ON'
'OFF'
Turn 'Off' (OUTn is turned off
by Auto Off function if LOD error
is detected)
Figure 32. Auto Output Off Function
Remain 'On'
(if no LOD error detected)
Turn 'Off' (OUTn is turned off
by Auto Off function if LOD error
is detected)
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