Signal Connection to External Devices
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DS1104 Hardware Installation and Configuration March 2004
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Notes and Tips on Signal Conditioning
The following notes and tips are intended to help you achieve
optimum results using the slave DSP digital I/O:
■ Changing Power-up Default on page 144
■ Using the ST1PWM Pin on page 145
■ Noise, crosstalk and inductive effects can degrade the signal and
lead to incorrect results if you do not perform the following
correctly:
• Grounding and Shielding on page 147
• Avoiding Crosstalk on page 151
• Wiring Up External Devices on page 152
Changing Power-up Default
After power-up the digital I/O are configured to input mode. In this
case, the I/O pins have a defined logical high level because of the built-
in pull-up resistors.
If you want to change the power-up default, you can set the I/O pins
to a defined logical low level by connecting a 1 kΩ pull-down resistor
from ground to each I/O pin.
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