TLC6C5712-Q1_15 Datasheet, PDF (16/64 Pages) Texas Instruments – TLC6C5712-Q1 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver With 8-Bit Dot Correction

TLC6C5712-Q1
SLVSCO9A – AUGUST 2015 – REVISED AUGUST 2015
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7.3.4.4 Individual Dot Correction Control
Each channel has an internal 8-bit linear-current digital-to-analog converter for individual dot correction control.
The 8-bit [OUTPUT_DC_CHx] fields are used to control DAC output current according to Equation 3. Note that
the minimum current is 1 / 256 of I_OUT,MAX. If absolutely zero current is required in some scenarios, the channel
can be disabled by setting the corresponding channel-enable [CH_ON_MASKx] bit HIGH.
I_(OUT)
=
I_(OUT)max ´
Dot Correction + 1
256
(3)
7.3.4.5 Output Slew-Rate Adjustment
To accommodate different slew rate requirements for EMC optimization, the [SLOW_SLEW_RATE] bit is
provided. Setting [SLOW_SLEW_RATE] HIGH makes both the rising and falling times, t_r and t_f, longer.
7.3.4.6 Register Lock
To avoid unintended modification of registers, the [OUTPUT_DC_CHx] fields can be locked with the
LOCK_CORR command and unlocked with the UNLOCK_CORR command. The [CH_ON_MASKx] bits can be
locked with the LOCK_MASK command and unlocked with the UNLOCK_MASK command. For details, see the
Register Protection section.
7.3.4.7 Deactivated-Channel Internal Pullup
To avoid floating outputs on a deactivated channel, optional pullup current to the SENSE node I_{(OUT_PULLUP)} is
provided. The pullup current is disabled by default and can be enabled by setting the [DIS_PULL_UP_CHx] bit
HIGH.
See the following addresses in Table 2: 46h through 43h, 69h, 6Ah, 6Dh, 6Eh, and 86h through 93h.
[OUTPUT_DC_CHx] field: R/W. 8-bit. Dot correction current DAC setting register for channel x.
[CH_ON_MASKx]:
R/W. HIGH: Channel output disabled; LOW: Channel output enabled
7.3.5 Advanced Diagnostics
The TLC6C5712-Q1 device supports a variety of diagnostic features, including:
• Pre-thermal warning and thermal shutdown protection
• LED short-to-supply detection
• LED short-to-GND detection
• LED open-load detection
• Deactivated-channel LED-open or -short detection
• Weak-LED-supply detection
• Adjacent-pin short detection
• Reference resistor open or short detection and protection
• PWM frequency monitor
7.3.5.1 Pre-Thermal Warning and Thermal Shutdown Protection
When the junction temperature exceeds the pre-thermal-warning threshold T_(PTW), [PRE_TSD_FLAG] in the
<READ_STATUS0> register is set HIGH to signal the pre-thermal warning. The ERR̅ open-drain output is also
pulled down. The microcontroller should respond to the fault warning and take actions to prevent junction
temperature rising.
If junction temperature continues to rise and exceeds thermal-shutdown threshold T_(TSD), the overtemperature
fault bit [TSD_FLAG] in the <READ_STATUS0> register is set HIGH to signal thermal shutdown, the ERR open-
drain output is also pulled down, and all output channels are turned off for protection.
[PRE_TSD_FLAG] and [TSD_FLAG] are latched when triggered. To clear either of the flags, issue the
RESET_STATUS command.
[TSD_FLAG] is latched after having been set. After the die temperature falls below T_(TSD) – T_(HYS), the LED
outputs are activated using the previous settings without re-initializing.
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