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TPS61300YFFR Datasheet(PDF) 25 Page - Texas Instruments

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No. de Pieza. TPS61300YFFR
Descripción  TPS6130xx 1.5-A and 4.1-A Multiple LED Camera Flash Driver With I2C Compatible Interface
Descarga  70 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61300YFFR Datasheet(HTML) 25 Page - Texas Instruments

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TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
www.ti.com
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
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Copyright © 2009–2016, Texas Instruments Incorporated
8.3.5 LED Temperature Monitoring (TPS61305, TPS61305A, TPS61306)
The TPS61305, TPS61305A, and TPS61306 devices monitor the LED temperature by measuring the voltage
between the TS and AGND pins. An internal current source provides the bias (
≈24 μA) for a negative-
temperature coefficient resistor (NTC), and the TS pin voltage is compared to internal thresholds (1.05 V and
0.345 V) to protect the LEDs against overheating.
The temperature monitoring related blocks are always active in DC light or flashlight modes. In voltage mode
operation (MODE_CTRL[1:0] = 11), the device only activates the TS input when the ENTS bit is set to high. In
shutdown mode, the LED temperature supervision is disabled and the quiescent current of the device is
dramatically reduced.
The LEDWARN and LEDHOT bits reflect the LED temperature. The LEDWARN bit is set when the voltage seen
at the TS pin is lower than 1.05 V. This threshold corresponds to an LED warning temperature value, the device
operation is still permitted.
While regulating LED current (for example, DC light or flashlight modes), the LEDHOT bit is latched when the
voltage seen at the TS pin is lower than 0.345 V. This threshold corresponds to an excessive LED temperature
value, the device operation is immediately suspended (MODE_CTRL[1:0] bits are reset and HOTDIE[1:0] bits are
set).
8.3.6 Hot Die Detector
The hot die detector monitors the junction temperature but does not shutdown the device. It provides an early
warning to the camera engine to avoid excessive power dissipation thus preventing from thermal shutdown
during the next high-power flash strobe.
The hot die detector (HOTDIE[1:0] bits) reflects the instantaneous junction temperature and is always enabled
excepted when the device is in shutdown mode (MODE_CTRL[1:0] = 00, ENVM = 0 and ENDCL = 0).
8.3.7 NRESET Input: Hardware Enable and Disable
Some devices out of the TPS6130xx family feature a hardware reset pin (NRESET). This reset pin allows the
device to be disabled by an external controller without requiring an I2C write command. Under normal operation,
the NRESET pin must be held high to prevent an unwanted reset. When the NRESET is driven low, the I2C
control interface and all internal control registers are reset to the default states and the part enters shutdown
mode.
8.3.8 ENDCL Input: DC Light Hardware Control
Some devices out of the TPS6130xx family feature a dedicated DC light control input (ENDCL). This logic input
can be used to turn on the LEDs for DC light operation. This hardware control pin can be useful to control the
torch light functionality from a separate engine (for example, base-band). In this mode of operation, the DC light
safety timer is not activated.
The ENDCL input is only active when the device is programmed into shutdown (MODE_CTRL[1:0] = 00) or into
voltage regulation mode (MODE_CTRL[1:0] = 11 or ENVM = 1) and the indicator control is turned off
(INDC[3:0] = 0000). LED1–3 inputs are controlled according to ENLED[3:1] bit settings.
8.3.9 Flashlight Blanking (Tx-MASK)
In direct drive mode (HC_SEL = 0), the Tx-MASK input signal can be used to disable the flashlight operation, for
example, during a RF PA transmission pulse. This blanking function turns the LED from flashlight to DC light
thereby reducing almost instantaneously the peak current loading from the battery. The Tx-MASK function has
no influence on the safety timer duration.


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