Section 19 A/D Converter (ADC)
Rev. 5.00 May 29, 2006 page 547 of 698
REJ09B0146-0500
19.9.2
Processing of Analog Input Pins
To prevent damage from voltage surges at the analog input pins (AN0 to AN3), connect an input
protection circuit like the one shown in figure 19.11. The circuit shown also includes an RC filter
to suppress noise. This circuit is shown as an example; The circuit constants should be selected
according to actual application conditions. Table 19.4 lists the analog input pin specifications and
figure 19.12 shows an equivalent circuit diagram of the analog input ports.
0.01
µ
F
10
µ
F
AV
CC
AN0 to AN3
AV
SS
SuperH microprocessor
*
*
100
Ω
0.1
µ
F
Note:
Figure 19.11 Example of Analog Input Protection Circuit
1.0 k
Ω
AN0 to AN3
20 pF
1 M
Ω
Figure 19.12 Analog Input Pin Equivalent Circuit
Table 19.4
Analog Input Pin Ratings
Item
Min
Max
Unit
Analog input capacitance
—
20
pF
Allowable signal-source impedance
—
5
k
Ω
Содержание SH7706 Series
Страница 8: ...Rev 5 00 May 29 2006 page viii of xlviii ...
Страница 160: ...Section 5 Cache Rev 5 00 May 29 2006 page 112 of 698 REJ09B0146 0500 ...
Страница 370: ...Section 11 Watchdog Timer WDT Rev 5 00 May 29 2006 page 322 of 698 REJ09B0146 0500 ...
Страница 532: ...Section 16 Serial Communication Interface with FIFO SCIF Rev 5 00 May 29 2006 page 484 of 698 REJ09B0146 0500 ...
Страница 554: ...Section 17 Pin Function Controller PFC Rev 5 00 May 29 2006 page 506 of 698 REJ09B0146 0500 ...
Страница 576: ...Section 18 I O Ports Rev 5 00 May 29 2006 page 528 of 698 REJ09B0146 0500 ...
Страница 614: ...Section 21 User Debugging Interface H UDI Rev 5 00 May 29 2006 page 566 of 698 REJ09B0146 0500 ...
Страница 746: ...Index Rev 5 00 May 29 2006 page 698 of 698 REJ09B0146 0500 ...
Страница 749: ...SH7706 Group Hardware Manual ...