TLC5916-Q1_16 Datasheet, PDF (17/34 Pages) Texas Instruments – 8-Bit Constant-Current LED Sink Drivers

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TLC5916-Q1, TLC5917-Q1
SLVS814A – JANUARY 2008 – REVISED MAY 2015
after cooling down and can be read out as the error status code in the Special mode.
• When one of the channel-specific sensors reaches trip temperature, only the affected output channel is shut
down, and the error status is stored only in the internal Error Status register of the affected channel. After
shutdown, the channel automatically restarts after cooling down, if the control signal (output latch) remains
on. The stored error status is not reset after cooling down and can be read out as error status code in the
Special mode.
For channel-specific overtemperature error detection, a channel must be on.
The error status code is reset when TLC591x-Q1 returns to Normal mode.
Table 3. Overtemperature Detection⁽¹⁾
STATE OF OUTPUT PORT
Off
On
On → all channels
Off
On
On → Off
CONDITION
I_OUT = 0 mA
T_j < T_j,trip global
T_j > T_j,trip global
T_j < T_j,trip channel n
T_j > T_j,trip channel n
ERROR STATUS CODE
0
1
All error status bits = 0
1
Channel n error status bit = 0
(1) The global shutdown threshold temperature is approximately 170°C.
MEANING
Normal
Global overtemperature
Normal
Channel n overtemperature
9.4 Device Functional Modes
The TLC591x-Q1 provides a Special Mode in which two functions are included: Error Detection and Current Gain
Control. There are two operation modes and three phases: Normal Mode phase, Mode Switching transition
phase, and Special Mode phase. The signal on the multiple function pin OE(ED2) is monitored to determine the
mode. When an one-clock-wide pulse appears on OE(ED2), the device enters the Mode Switching phase. At this
time, the voltage level on LE(ED1) determines the mode to which the TLC591x-Q1 switches. In the Normal Mode
phase, the serial data can be transferred into TLC591x-Q1 via the pin SDI, shifted in the shift register, and
transferred out via the pin SDO. LE(ED1) can latch the serial data in the shift register to the output latch.
OE(ED2) enables the output drivers to sink current.
In the Special Mode phase, the low-voltage-level signal OE(ED2) can enable output channels and detect the
status of the output current, to determine if the driving current level is sufficient. The detected Error Status is
loaded into the 8-bit shift register and shifted out via the pin SDO, synchronous to the CLK signal. The system
controller can read the error status and determine whether or not the LEDs are properly lit.
In the Special Mode phase, the TLC591x-Q1 allows users to adjust the output current level by setting a runtime-
programmable Configuration Code. The code is sent into the TLC591x-Q1 via SDI. The positive pulse of
LE(ED1) latches the code in the shift register into a built-in 8-bit configuration latch, instead of the output latch.
The code affects the voltage at the terminal R-EXT and controls the output-current regulator. The output current
can be finely adjusted by a gain ranging from 1/12 to 127/128 in 256 steps. Therefore, the current skew between
ICs can be compensated within less than 1%. This feature is suitable for white balancing in LED color display
panels.
Table 4. Truth Table in Normal Mode
CLK
↑
↑
↑
↓
↓
LE(ED1)
H
L
H
X
X
OE(ED2)
L
L
L
L
H
SDI
Dn
Dn + 1
Dn + 2
Dn + 3
Dn + 3
OUT0...OUT7
Dn...Dn – 7
No change
Dn + 2...Dn – 5
Dn + 2...Dn – 5
Off
SDO
Dn – 7
Dn – 6
Dn – 5
Dn – 5
Dn – 5
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