TLC5970
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SBVS140 –MARCH 2010
Status Information Data (SID) Readout Register (Register Address = 1010b)
When any data are written to this register address, the status of five error detections are loaded to the lower 36
bits in the 40-bit shift register from this readout register (register address = 1010b). The higher 4-bit data in the
40-bit shift register are not changed from 1010b. The loaded data can be readout from SDTY and SDTZ and
syncronized by the shift clock generated from SCKA and SCKB. The data bit assignments are are shown in
Table 18 and Figure 35.
Table 18. SID Readout Register Bit Assignment
BIT NUMBER
BIT NAME
DESCRIPTION
LED open detection (LOD) error flag
0 = All OUTn are either connected to the LED lamp or are not
connected to the LED lamp. When all OUTn are not connected to
LED lamp, the OVP flag is set to '1'.
1 = One or two OUTn are not connected to the LED lamp. This bit is
set to '1' when the voltage of OUTn connected to the LED lamp is
greater than approximately 4 V. Also, this bit is set to '1' when the
SWOFF pin is connected to VREG.
0
LOD
Short-Circuit Protection (SCP) error flag
0 = The buck converter is operating normally. Also, this bit is set to
'0' when SWOFF is connected to VREG.
1 = The buck converter is not operated by the SCP.
1
2
SCP
OVP
Overvoltage Protection (OVP) flag
0 = The buck converter is operating normally. Also, this bit is set to
'0' when SWOFF is connected to VREG.
1 = The buck converter is not operated by the OVP.
Pre-Thermal Shutdown (PTD) log
0 = The LED driver has been in normal operation after the previous
readout register reading.
3
PTD
1 = The LED driver has stopped operating due to the device
temperature exceeding the PTD detect temperature after the
previous readout register reading. This log is held until these register
data are readout.
Thermal Shutdown (TSD) log
0 = The buck converter/LED driver/interface has been in normal
operation after the previous readout register reading.
1 = The buck converter/LED driver/interface has stopped operating
due to the device temperature exceeding the TSD detect
temperature after the previous readout register reading. This flag is
held until these register data are readout.
4
TSD
—
35-5
TI reserved data (31-bit data, no fixed data)
Status Information Data (SID) Read Out Register
MSB
35
LSB
0
34
TI
6
5
4
3
2
1
TI
TI
TI
TSD
Log
PTD
Log
OVP
Flag
SCP
Flag
LOD
Flag
¼
Reserved Reserved
Bit 30
Bit 29
Reserved Reserved
Bit 1 Bit 0
Figure 35. SID Readout Register Bit Assignment
Copyright © 2010, Texas Instruments Incorporated
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