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D1-CON (J14 pin3 and pin4) and D2-CON (J14 pin1 and pin2) are the jumpers used to connect the on-
board flash LEDs to the LED output of the driver.
STROBE (J9) - This pin provides an external method for initiating a flash event. The STROBE pin is
connected to ground via a 300-kΩ resistor internal to the LM3643. To externally drive this pin, either
connect a control signal directly to the STROBE pin of the connector or place a jumper between connector
pins STROBE and PWM0. Pin PWM0 can be configured as a time-adjustable voltage pulse via the
General User Interface (GUI) software provided.
TORCH/TEMP (J21) - This pin provides an external method for initiating a torch event. The
TORCH/TEMP pin is connected to ground via a 300-kΩ resistor internal to the LM3643 as well as an
externally connected NTC thermistor. To externally drive this pin, either connect a control signal directly to
the TORCH/TEMP pin of the connector or place a jumper between connector pins TORCH/TEMP and
PWM1. Pin PWM1 can be configured as ON or OFFvia the GUI software provided. Removing the jumper,
and setting the TORCH/TEMP pin to TEMP mode, the TEMP function can be utilized via the externally
connected NTC thermistor.
TX (J11) - This pin is used to initiate a TX-interrupt event. The TX pin is connected to ground via a 300-kΩ
resistor internal to the LM3643. To externally drive this pin, either connect a control signal directly to the
TX pin of the connector or place a jumper between connector pins TX and PWM2. Pin PWM2 can be
configured as to provide continuous voltage pulses via the GUI software provided.
SDA / SCL (J19) - These connections allow the user to externally control the I
2
control of the I
C lines, do not connect the VIO jumper to either the 3.3 V or the VIN pin.
SNVU399 – August 2014
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Figure 3. STROBE Jumper Settings
Figure 4. TORCH/TEMP Jumper Settings
Figure 5. TX Jumper Settings
Copyright © 2014, Texas Instruments Incorporated
Setup
2
C lines. For independent
LM3643EVM User's Guide
5
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