TLC6C5712-Q1 Datasheet, PDF (21/68 Pages) Texas Instruments – 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver

www.ti.com
TLC6C5712-Q1
SLVSCO9A – AUGUST 2015 – REVISED AUGUST 2015
Because for each address the TLC6C5712-Q1 device shifts out a fixed amount of data at the end of a write-read
cycle, it is possible to send different address codes to each IC in a daisy chain.
For a number N of daisy-chained devices, a communication cycle comprises 16 × N SCK cycles with the
corresponding data, transferred from shift registers to latches or from latches to shift registers on the rising edge
of LATCH. The falling edge of LATCH indicates the end of a communication cycle.
The TLC6C5712-Q1 device supports multiple devices in cascaded daisy-chain mode. Each communication
sequence must only have one LATCH rising edge, and therefore cannot be split into multiple smaller sequences.
CLK
SDI
LATCH
SDO
W1 W1 W1 W1
d15 d14 d13 d12
SHRN (18)
W1 W1 W1
d2
d1
d0
D/C
W2 W2
d15 d14
TLADZ
Write,
Read
W0 W1
d0 d15
W1 W1 W1 W1
d14 d13 d12 d11
W1 W2
d0 d15
Figure 22. Write-Access Data for a Typical Use Case
7.3.8 Thermal Information
TLC6C5712-Q1 has internal thermal shutdown (TSD) protection from device overheating. For continuous
operation, the junction temperature should not exceed thermal-shutdown threshold. If TSD is not disabled by
register and junction temperature exceeds thermal shutdown threshold, all outputs are turned off for protection.
When the junction temperature falls below the thermal threshold minus hysteresis, outputs resume.
Use Equation 4 to estimate the device power.
Ã¥^{( ) 11}
P_D(tot) = V_CC ´ I_CC +
x=0
V_(OUTx) ´ I_(OUTx)
-
V_(IREF)
R_(IREF)2
where
• P_D(tot) = Total power dissipation of the device
• V_(OUTx) = Voltage drop for channel x
• I_(OUTx) = Average LED current for channel x
• V_(IREF) = Reference voltage
• R_(IREF) = Reference resistor
(4)
7.4 Device Functional Modes
7.4.1 Operation With V_CC < 2.8 V (Power-On-Reset Threshold)
The TLC6C5712-Q1 device might not work properly with V_CC below 2.8 V. When POR is triggered, the device
latches a POR fault and reports it through the ERR output. If V_CC continuous to drop, the content of the registers
could be reset to their default value, with all outputs shutting down by default.
7.4.2 Operation With V_CC ≥ 2.8 V (Power-On-Reset Threshold)
The TLC6C5712-Q1 device is fully functional with V_CC at or above 2.8 V. The output current depends on the
channel output voltage, V_(OUTx). Given enough headroom for output transistors, the device should sink current as
programmed. If the headroom voltage is not enough, the output current could be lower than programmed.
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: TLC6C5712-Q1
Submit Documentation Feedback
21