H8SSLASH2218 datasheet(597/750 Pages) RENESAS

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Section 15 A/D Converter

Rev.6.00 Jun. 03, 2008 Page 549 of 698

REJ09B0074-0600

15.8.4

Range of Analog Power Supply and Other Pin Settings

If the conditions below are not met, the reliability of the device may be adversely affected.

• Analog input voltage range

The voltage applied to analog input pin ANn during A/D conversion should be in the range

VSS

≤ ANn ≤ Vref.

• Vref input range

The analog reference voltage input at the Vref pin set is the range Vref

≤ Vcc.

15.8.5

Notes on Board Design

Careful consideration is required in board design for noise countermeasures and in order to prevent

damage due to abnormal voltage, such as an excessive surge at the analog input pins (AN0 to AN3

or AN14 to AN15) and analog reference voltage pin (Vref).

Table 15.6

Analog Pin Specifications

Item

Min.

Max.

Unit

Analog input capacitance

—

Permissible signal source impedance

—

Note: * Vcc = 2.7 to 3.6 V

20 pF

ANn

Note: Values are reference values.

10 k

To A/D converter

Figure 15.10 Analog Input Pin Equivalent Circuit

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