TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-122
V1.1, 2011-05
ADC, V1.3
The broken wire detection mechanism allows to apply a voltage outside the expected
measurement value range of the connected sensor. If the actual digital conversion result
is located outside the expected measurement range (e.g. by using limit checking) with
enabled broken wire detection, a defective connection has been detected. It is
recommended to ensure enough margin between the voltage applied during the
preparation phase and the sensors output range to minimize the effects of parasitics and
leakage.
Input channels CH30 (V
AGND
) and CH31 (V
AREF
) have been especially introduced to
allow the selection of the maximum or the minimum voltage of the measurement range.
Note: The length of the complete analog to digital conversion is increased by the length
of the preparation phase if the broken wire detection is enabled. This influences
the timing of conversion sequences.
The preparation phase is introduced as additional presample phase (same behavior as
the standard sampling phase, but with the possibility to select a different channel
number). The analog part provides additional inputs for the channel number to be used
during the presample phase and an enable line. The channel number is directly
connected to BWDCFGR.CHP, whereas the enable line corresponds to the
BWDENR.ENx bit for the arbitration winner CH x. The analog part expects these values
at the beginning of the conversion (like all other signals) and automatically handles the
insertion of the presample phase (handled like two consecutive sample phases with
different channel numbers (but same length) before starting the conversion phase).
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