SH7065 Datasheet, PDF (641/941 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Section 15 A/D Converter
15.7.2 Handling of Analog Input Pins
To prevent damage from surges and other abnormal voltages at the analog input pins (AN0-AN7),
a protection circuit such as that shown in figure 15.8 should be connected. This circuit also
includes a CR filter function that suppresses error due to noise. The circuit shown here is only a
design example; circuit constants must be decided on the basis of the actual operating conditions.
Figure 15.9 shows an equivalent circuit for the analog input pins, and table 15.5 summarizes the
analog input pin specifications.
AV_CC
100 Ω
SH7065
AN0–AN7
*
0.1 µF
AV_SS
Note: *
10 µF
0.01 µF
Figure 15.8 Example of Analog Input Pin Protection Circuit
Rev. 5.00 Sep 11, 2006 page 619 of 916
REJ09B0332-0500