TLC6C5712-Q1 Datasheet, PDF (18/68 Pages) Texas Instruments – 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver

TLC6C5712-Q1
SLVSCO9A – AUGUST 2015 – REVISED AUGUST 2015
www.ti.com
SG_MASK_CHx
SG_FA ULT_CHx
SHORT_MASK
ANY_SHORT_FLAG
ERR
SHORT_FAULT_CHx
SHORT_MASK_CHx
Other Faults
Figure 19. Short Fault Report Topology
7.3.5.4 LED Open-Load Detection
The device has independent LED open-load detection for each channel. If an LED open-load condition is
detected, the [OPEN_FAULT_CHx] bit for the channel is set HIGH, and the [ANY_OPEN_FLAG] bit also is set
HIGH. [ANY_OPEN_FLAG] also pulls down the ERR open-drain output.
An LED open-load 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 [OPEN_FAULT_CHx] fault bits.
Issue a RESET_STATUS command to clear the [OPEN_FAULT_CHx] fault bits.
The [OPEN_FAULT_CHx] channel-fault bits can be masked independently by the [OPEN_MASK_CHx] bits.
when the [OPEN_MASK_CHx] bit of any channel is set HIGH, the open-load fault on the specific channel is not
reported to the [ANY_OPEN_FLAG] bit.
[ANY_OPEN_FLAG] is the indicator for open-load detectors. [ANY_OPEN_FLAG] can be masked by
[OPEN_MASK] to avoid pulling down the ERR̅ open-drain output.
OPEN_MASK_CHx
OPEN_MASK
ERR
OPEN_FAULT_CHx
ANY_OPEN_FLAG
Other Channels
Other Faults
Figure 20. Open Fault Report Topology
7.3.5.5 Deactivated-Channel LED Open or Short Detection
Deactivating a channel by setting [CH_ON_MASKx] automatically enables detection of an off-state LED open
load, short to the supply, or short to GND. If a fault is detected when the pullup is enabled, the respective fault
register is set and the ERR̅ open-drain output is pulled down.
To clear the fault, issue the RESET_STATUS command, the same as for activated-state diagnostics. The fault-
masking mechanism is also the same as for activated-state diagnostics.
If an application allows absolutely no current during the channel disabled state, disable the off-state LED open-
or-short detection feature using the [DIS_OFF_FAULT_DIAG] bit.
There is a provision for pulling each channel up to SENSE to avoid a floating node during off-state. This function
can be enabled by setting the [DIS_PULL_UP_CHx] bit to HIGH. If any [DIS_PULL_UP_CHx] bit is set HIGH, the
[DIS_PULL_UP_FLAG] bit is also set HIGH.
18
Submit Documentation Feedback
Product Folder Links: TLC6C5712-Q1
Copyright © 2015, Texas Instruments Incorporated