Break-Away Sections
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For remote sensor usage it is recommended to use twisted pair or coaxial cable for the connection to the
LDC1101 section of the PCB as shown in Figure 2-9. The maximum distance that a sensor can be located
is a function of the sensor frequency, sensor Q, and level of environmental interference. Refer to the
Remote Sensor Calculator tool in the LDC Tools Spreadsheet (http://www.ti.com/lit/zip/slyc137) to
evaluate maximum sensor distances.
Figure 2-9. Remote Sensor with Twisted Pair Connection
Break-Away MSP430 Section
The MSP430 section of the LDC1101EVM can be broken along the indicated line to separate the MSP430
from the LDC1101 IC. A 7 position 100mil spacing connector can be used for connecting the LDC1101 to
the MSP430, or another MCU if necessary. The interface pins on the connector are labeled for proper
functionality.
This connector can also be used to supply an external clock input to the LDC1101. If necessary, R7, a
0603 footprint for a 50Ω termination resistor, is present next to the LDC1101. R7 is not populated by
default. A ground via is also next to the CLKIN pad for connections using coaxial or twisted pair.
Figure 2-10. MSP430 Section
10
EVM Features and Connections SNOU137–May 2015
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