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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 1201 -
Revision V1.30
NUC97
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100
YM
ADC analog input.
If used in touch screen, it should connect to the negative end of Y
axis.
If used in 5-wire touch screen, it could connect to lower-left
electrode.
101
YP
ADC analog input.
If used in touch screen, it should connect to the positive end of Y
axis.
If used in 5-wire touch screen, it could connect to upper-right
electrode.
110
XM
ADC analog input.
If used in touch screen, it should connect to the negative end of X
axis.
If used in 5-wire touch screen, it could connect to lower-right
electrode.
111
XP
ADC analog input.
If used in 4-wire touch screen, it should connect to the positive
end of X axis.
If used in 5-wire touch screen, it could connect to upper-left
electrode.
The input current on analog input pins depends on analog input voltage and sampling rate. In the
sampling mode, the input current charges the internal sampling capacitor. After the capacitor is
fully charged, the current will be off. The internal sampling capacitor must be charged to 12-bit
settling level at sampling time, under afore mentioned condition.
The signal source impedance connected to analog input needs to satisfy the following expression:
( )
(
)
Ron
Ron
Rsrc
Rsrc
Csamp
Csamp
Rref
Rref
Figure 5.32-3 Simplified Sampling Diagram
High Speed Mode(1Ms/s)
5.32.5.3