TLC59116-Q1 Datasheet, PDF (13/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Driver

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TLC59116-Q1
SLDS223A – MARCH 2016 – REVISED MARCH 2016
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 Overtemperature Detection and Shutdown
The TLC59116-Q1 LED is equipped with a global overtemperature sensor and 16 individual channel-selective
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 registers EFLAG1 and EFLAG2.
• 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
registers EFLAG1 and EFLAG2.
For channel-specific overtemperature error detection, a channel must be on.
The error flags of open-circuit and overtemperature are ORed to set the EFLAG1 and EFLAG2 registers.
The error status code because of overtemperature is reset when the host writes 1 to bit 7 of the MODE2 register.
The host must write 0 to bit 7 of the MODE2 register to enable the overtemperature error flag. See Table 2.
Table 2. Overtemperature Detection ⁽¹⁾
STATE OF OUTPUT PORT
On
On → all channels Off
On
On → Off
CONDITION
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
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
9.3.3 Power-On Reset (POR)
When power is applied to V_CC, an internal power-on reset holds the TLC59116-Q1 in a reset condition until V_CC
reaches V_POR. At this point, the reset condition is released and the TLC59116-Q1 registers, and I²C Bus state
machine are initialized to their default states (all zeroes), causing all the channels to be deselected. Thereafter,
V_CC must be lowered below 0.2 V to reset the device.
9.3.4 External Reset
A reset can be accomplished by holding the RESET pin low for a minimum of t_W. The TLC59116-Q1 registers
and I²C state machine are held in their default states until the RESET input is again high.
This input requires a pullup resistor to V_CC if no active connection is used.
9.3.5 Software Reset
The Software Reset Call (SWRST Call) allows all the devices in the I²C Bus to be reset to the power-up state
value through a specific I²C Bus command.
The SWRST Call function is defined as the following:
1. A Start command is sent by the I²C Bus master.
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