No Fault
Short Fault
Minimum
Return
Threshold
Maximum
Trigger
Threshold
3.1 V
2.5 V
2.2 V
V
OUT
Minimum
Trigger
Threshold
V
OUT,TTh
V
OUT,RTh
SLVS695D – JUNE 2007 – REVISED JANUARY 2015
Table 2. Shorted-Load Detection
CONDITION OF OUTPUT
STATE OF OUTPUT PORT
ERROR STATUS CODE
MEANING
VOLTAGE
Off
I
OUT
= 0 mA
0
Detection not possible
V
OUT
≥
V
OUT,TTh
0
Short circuit
On
V
OUT
< V
OUT,RTh
1
Normal
Figure 10. Short-Circuit Detection Principle
9.3.3 Overtemperature Detection and Shutdown
TLC591x
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 TLC591x returns to Normal Mode.
Copyright © 2007–2015, Texas Instruments Incorporated
15
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