TLC59461 Datasheet, PDF (17/33 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction

TLC59461
www.ti.com............................................................................................................................................... SLVS896A – NOVEMBER 2008 – REVISED MARCH 2009
STATUS INFORMATION DATA (SID)
Status information data (SID) are 17-bit, read-only data, accessible in the grayscale data input mode (MODE =
GND). Both the LED open detection (LOD) error and the thermal error flag (TEF) are shifted out of the SOUT pin
with each rising edge of SCLK. The 16 LOD bits for each channel and the TEF bit are written into the 17 most
significant bits (MSBs) of the shift register at the rising edge of the first SCLK after XLAT goes high. As a result,
the previous data in the 17 MSBs are lost at the same time. Figure 26 shows the bit assignments, Table 1
describes the SID data definition, and Figure 27 illustrates the read timing for the status information data.
MSB
191
LSB
176
175
174
0
LOD 15
LOD 0
TEF
X
X
LOD Data
TEF
Reserved
Figure 26. Status Information Data Configuration (XHALF = High)
MODE
XHALF
SID DATA
0
1
Low Level
High Level
Table 1. SID Data Definition
DEFINITION
LODn
No LED open error
LED is open or shorted to GND
TEF
No thermal error
Over temperature
XLAT
GS0 GS0
SIN
1
0
191 192
SCLK
GS15 GS15 GS15
11A 10A 9A
1
2
3
GS14 GS14 GS14 GS14 GS14
9A 8A 7A 6A 5A
15 16 17 18 19
GS0 GS0 GS0
2A 1A 0A
190 191 192
SOUT
Not GS15
Valid 11
LOD LOD LOD
15 14 13
LOD LOD
Not Not
TEF
1
0
Valid Valid
Not Not GS15
Valid Valid 11A
Figure 27. Status Information Data Read Timing (XHALF = High)
The LOD data are updated at the rising edge of the 33rd GSCLK pulse after BLANK goes low; the LOD data are
retained until the next 33rd GSCLK. LOD data are only checked for outputs that are turned on during the rising
edge of the 33rd GSCLK pulse. A '1' in a LOD bit indicates an open LED condition for the corresponding
channel. A '0' indicates normal operation. The GS data should be equal to or higher than 21h (33d) to detect an
open LED in every PWM cycle. When the IC is powered on, LOD data do not show correct values. Therefore,
LOD data must be read at the rising edge of the 33rd GSCLK pulse after BLANK goes low.
The TEF bit indicates that the IC temperature is too high. A '1' in the TEF bit means that the IC temperature
exceeds the detect temperature threshold, T_TEF. A '0' in the TEF bit indicates normal operating temperature
conditions.
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