TLC6C5712-Q1 Datasheet, PDF (17/68 Pages) Texas Instruments – 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver

www.ti.com
TLC6C5712-Q1
SLVSCO9A – AUGUST 2015 – REVISED AUGUST 2015
The flag bits can be individually masked by [PRE_TSD_MASK] and [TSD_MASK]. [PRE_TSD_MASK] prevents
the ERR̅ open-drain output. [TSD_MASK] prevents the ERR̅ open-drain output and thermal shutdown of all
channels. Even if the faults are masked, the fault status can still be read in the registers.
PRE_TSD_MASK
ERR
Pre-Therma l
De te c to r
PRE_TSD_FLAG
Thermal Shutdown
Detector
TSD_FLAG
Other Faults
TSD_MASK
Thermal
Shutdown
Figure 18. Thermal Fault Report Topology
7.3.5.2 LED Short-to-Supply Detection
The device has independent LED short-to-supply detection for each channel. Whether the channel PWM source
is HIGH or LOW, the voltage difference between the SENSE and OUTx pins is monitored.
If an LED short to the supply is detected, the [SHORT_FAULT_CHx] bit of the channel is set HIGH and the
[ANY_SHORT_FLAG] bit is set HIGH The [ANY_SHORT_FLAG] also pulls down the ERR̅ open-drain output.
The LED short-to-supply fault does not disable the corresponding channel output. when the fault condition is
removed, the LED should resume normal operation. Fault conditions are latched in the [SHORT_FAULT_CHx]
bits. To clear the [SHORT_FAULT_CHx] bits, issue the RESET_STATUS command.
The [SHORT_FAULT_CHx] bits can be masked independently for each channel by the [SHORT_MASK_CHx]
bits. when the [SHORT_MASK_CHx] bit of any channel is set HIGH, the short-to-supply fault on the specific
channel is not reported to [ANY_SHORT_FLAG].
7.3.5.3 LED Short-to-GND Detection
The TLC6C5712-Q1 device is able to distinguish an LED short-to-GND condition from an LED open-detection
condition by having an internal pullup current to the SENSE node. The pullup is enabled during the PWM OFF
state or channel-deactivated state.
If an LED short-to-GND is detected, the [SG_FAULT_CHx] bit for the channel is set HIGH, and the
[ANY_SHORT_FLAG] bit is also set HIGH. [ANY_SHORT_FLAG] also pulls down the ERR̅ open-drain output.
An LED short-to-GND fault does not disable the corresponding channel output. when a fault condition is
removed, the LED should resume normal operation. Fault conditions are latched in the [SG_FAULT_CHx] fault
bits. Issue a RESET_STATUS command to clear the [SG_FAULT_CHx] fault bits.
The [SG_FAULT_CHx] channel-fault bits can be masked independently by [SG_MASK_CHx]. when the
[SG_MASK_CHx] bit of any channel is set HIGH, the short-to-GND fault on the specific channel is not reported to
[ANY_SHORT_FLAG].
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: TLC6C5712-Q1
Submit Documentation Feedback
17