TLC5916_10 Datasheet, PDF (21/30 Pages) Texas Instruments – 8-BIT CONSTANT-CURRENT LED SINK DRIVERS

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TLC5916, TLC5917
8-BIT CONSTANT-CURRENT LED SINK DRIVERS
SLVS695A – JUNE 2007 – REVISED MARCH 2008
Overtemperature Detection and Shutdown
TLC5916/TLC5917 is equipped with a global overtemperature sensor and eight individual, channel-specific,
overtemperature sensors.
• When the global sensor reaches the trip temperature, all output channels are shut down, and the error status
is stored in the internal Error Status register of every channel. After shutdown, the channels automatically
restart 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 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 TLC5916/TLC5917 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
Copyright © 2007–2008, Texas Instruments Incorporated
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Product Folder Link(s): TLC5916 TLC5917