h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 764

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 22 A/D Converter
22.8.3
If conditions shown below are not met, the reliability of this LSI may be adversely affected.
22.8.4
In board design, digital circuitry and analog circuitry should be as mutually isolated as possible,
and layout in which digital circuit signal lines and analog circuit signal lines cross or are in close
proximity should be avoided as far as possible. Failure to do so may result in incorrect operation
of the analog circuitry due to inductance, adversely affecting A/D conversion values. Also, digital
circuitry must be isolated from the analog input signals (AN2 to AN7), analog reference voltage
(AV
(AV
22.8.5
A protection circuit connected to prevent damage due to an abnormal voltage such as an excessive
surge at the analog input pins (AN2 to AN7) and analog reference voltage (AV
connected between AVCC and AVSS as shown in figure 22.7. Also, the bypass capacitors
connected to AVCC and AVref, and the filter capacitors connected to AN7 to AN2 must be
connected to AVSS.
Rev. 3.00 Jan 25, 2006 page 712 of 872
REJ09B0286-0300
The voltage applied to analog input pin ANn during A/D conversion should be in the range
AV
Digital input voltage range
The voltage applied to digital input pin CINn should be in the range AV
V
Relation between AV
For the relationship between AV
is not used, the AVCC and AVSS pins must on no account be left open.
AVref pin reference voltage specification range
The reference voltage of the AVref pin should be in the range AV
It is not recommended to use the D/A converter or A/D converter simultaneously with the USB
because the bus driver/receiver power supply pin DrVCC/DrVSS is shared with the analog
power supply pin AVCC/AVSS.
Analog input voltage range
ref
SS
SS
), and analog power supply (AV
) should be connected at one point to a stable digital ground (V
SS
CINn
Setting Range of Analog Power Supply and Other Pins
Notes on Board Design
Notes on Noise Countermeasures
ANn
V
AV
CC
(n = 0 to 7).
ref
(n = 2 to 7).
CC
, AV
SS
and V
CC
, AV
CC
) by the analog ground (AV
CC
, V
SS
and V
SS
CC
, V
SS
, set AV
SS
SS
SS
= V
ref
). Also, the analog ground
) on the board.
SS
AV
. If the A/D converter
SS
CC
ref
.
CINn
) should be
AV
ref
and