TLC5916-Q1_16 Datasheet, PDF (16/34 Pages) Texas Instruments – 8-Bit Constant-Current LED Sink Drivers

TLC5916-Q1, TLC5917-Q1
SLVS814A – JANUARY 2008 – REVISED MAY 2015
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Feature Description (continued)
Table 1. Open-Circuit Detection
STATE OF OUTPUT PORT
Off
On
CONDITION OF OUTPUT
CURRENT
I_OUT = 0 mA
I_OUT < I_OUT,Th ⁽¹⁾
I_OUT ≥ I_OUT,Th ⁽¹⁾
(1) I_OUT,Th = 0.5 × I_OUT,target (typical)
ERROR STATUS CODE
0
0
Channel n error status bit 1
MEANING
Detection not possible
Open circuit
Normal
9.3.2 Short-Circuit Detection Principle (TLC5917-Q1 Only)
The LED short-circuit detection compares the effective voltage level (V_OUT) with the shorted-load detection
threshold voltages V_OUT,TTh and V_OUT,RTh. If V_OUT is above the V_OUT,TTh threshold, the TLC5917-Q1 detects an
shorted-load condition. If V_OUT is below the V_OUT,RTh threshold, no error is detected and the error bit is reset. This
error status can be read as an error status code in the Special mode. For short-circuit error detection, a channel
must be on.
STATE OF OUTPUT PORT
Off
On
Table 2. Shorted-Load Detection
CONDITION OF OUTPUT
VOLTAGE
I_OUT = 0 mA
V_OUT ≥ V_OUT,TTh
V_OUT < V_OUT,RTh
ERROR STATUS CODE
0
0
1
MEANING
Detection not possible
Short circuit
Normal
No Fault
Minimum
Return
Threshold
Minimum
Trigger
Threshold
Maximum
Trigger
Threshold
Short Fault
2.2 V
V_OUT,RTh
2.5 V
3.1 V
V_OUT,TTh
V_OUT
Figure 9. Short-Circuit Detection Principle
9.3.3 Overtemperature Detection and Shutdown
TLC591x-Q1 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 shutdown, 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
16
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