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Overtemperature Detection and Shutdown

TLC5916, TLC5917

8-BIT CONSTANT-CURRENT LED SINK DRIVERS

SLVS695A – JUNE 2007 – REVISED MARCH 2008

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.

STATE OF OUTPUT PORT

CONDITION

ERROR STATUS CODE

MEANING

Off

0

On

1

Normal

On

→ all channels

All error status bits = 0

Global overtemperature

Off

1

Normal

On

On

→ Off

Channel n error status bit = 0

Channel n overtemperature

(1)

The global shutdown threshold temperature is approximately 170

°C.

Copyright © 2007–2008, Texas Instruments Incorporated

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Product Folder Link(s): TLC5916 TLC5917