M16C6S_09 Datasheet, PDF (188/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
IT800AFE (Analog Front End)
(b)ADC (Analog to Digital Converter)
The output of the channel filter (maximum of three) connected outside is connected to 1 bit ADC which
consists of an operational amplifier and a comparator.
M16C/6S build in ADC of three equivalent performances. The circuit of one ADC has composition
shown in the following figure.
R1/R2/R3
C1/C2/C3
AMP1_Out/AMP2_Out/
AMP3_Out
Channel
Filter
0.22µF 1k
3.3V
AMP1_IN/
AMP2_IN/
AMP3_IN/
Vref
10k
-
Amplifier
+
CH1_InP/CH2_InP/
CH3_InP
+
Comparator
-
0.1µF
10k
CH1_InN/CH2_InN/
CH3_InN
0.1µF
FB1/FB2/FB3
Figure 1.23.4 ADC block diagram
Three ADC use all three by the signal zone to be used. The constant of a filter is set up as shown in the
following table.
Table 1.23.3 The example of an ADC part constant setting
Application
Parts
characteristic
C1
C2
C3
Unit
FCC/ARIB
33
22
10
pF
Capacitor
CECLEC-B
33
pF
Parts
Application
characteristic
R1
R2
R3
Unit
FCC/ARIB
10
10
12
kΩ
Register
CECLEC-B
10
kΩ
Rev.5.01 Dec 10, 2009 page 188 of 201
REJ03B0014-0501