11
11-27
A-D Converters
32180 Group User's Manual (Rev.1.0)
11.2 A-D Converter Related Registers
Figure 11.2.1 shows an example of A-D disconnection detection assist method in which the conversion start
state is set to the AVCC side (i.e., precharge before conversion is selected). Figure 11.2.2 shows an example
of A-D disconnection detection assist method in which the conversion start state is set to the AVSS side (i.e.,
discharge before conversion is selected).
Figure 11.2.1 Example of A-D Disconnection Detection on AVCC Side (Precharge Before Conversion Selected)
Figure 11.2.2 Example of A-D Disconnection Detection on AVSS Side (Discharge Before Conversion Selected)
Analog input
ADiINn
Precharge
Broken wire
R
C
Precharge
control signal
Chopper amp
capacitor
Discharge
control signal
Typical external circuit (Note 1)
On
Off
Note 1: In case of broken wire, the conversion result varies with external circuits.
Therefore, careful evaluation is required before this function can be used.
ADDDAEN
Analog input
ADiINn
Discharge
Broken wire
R
C
Precharge
control signal
Chopper amp
capacitor
Discharge
control signal
Typical external circuit (Note 1)
Off
On
Note 1: In case of broken wire, the conversion result varies with external circuits.
Therefore, careful evaluation is required before this function can be used.
ADDDAEN
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