HD64F3026X25 Renesas Electronics America, HD64F3026X25 Datasheet - Page 497

• Manufacturer Part Number: HD64F3026X25
• Description: MCU 3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3026X25

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

14.6
When using the A/D converter, note the following points:
1. Analog Input Voltage Range
2. Relationships of AV
3. V
4. Note on Board Design
5. Note on Noise
During A/D conversion, the voltages input to the analog input pins AN
AV
AV
be left open, even if the A/D converter is not used.
The reference voltage input at the V
In board layout, separate the digital circuits from the analog circuits as much as possible.
Particularly avoid layouts in which the signal lines of digital circuits cross or closely approach
the signal lines of analog circuits. Induction and other effects may cause the analog circuits to
operate incorrectly, or may adversely affect the accuracy of A/D conversion.
The analog input signals (AN
voltage (AV
analog ground (AV
board.
To prevent damage from surges and other abnormal voltages at the analog input pins (AN
AN
figure 14.7 between AV
the filter capacitors connected to AN
like the ones in figure 14.7 are connected, the voltage values input to the analog input pins
(AN
conversion is frequently performed in scan mode so that the current that charges and
discharges the capacitor in the sample-and-hold circuit of the A/D converter becomes greater
than that input to the analog input pins via input impedance (Rin). The circuit constants should
therefore be selected carefully.
REF
SS
CC
7
) and analog reference voltage pin (V
0
Programming Range
, AV
to AN
Usage Notes
AN
SS
n
7
, V
CC
) will be smoothed, which may give rise to error. Error can also occur if A/D
) must be separated from digital circuits by the analog ground (AV
V
CC
REF
, and V
SS
.
CC
) should be connected to a stable digital ground (V
and AV
CC
SS
and AV
should be related as follows: AV
0
to AN
SS
to V
SS
REF
. The bypass capacitors connected to AV
0
7
CC
), analog reference voltage (V
to AN
pin should be in the range V
and V
REF
7
), connect a protection circuit like the one in
must be connected to AV
SS
Rev. 2.00 Sep 20, 2005 page 457 of 800
SS
= V
SS
REF
REF
. AV
Section 14 A/D Converter
n
), and analog supply
SS
SS
should be in the range
CC
. If filter capacitors
AV
) at one point on the
and AV
REJ09B0260-0200
CC
CC
.
and V
SS
). The
SS
must not
REF
0
and
to