DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 550

• Manufacturer Part Number: DF2345TE20
• Description: MCU 5V 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2345TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 71
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 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: -
• Other names: HD64F2345TE20; HD64F2345TE20

Section 14 A/D Converter
Also, digital circuitry must be isolated from the analog input signals (AN0 to AN7), analog
reference power supply (V
Also, the analog ground (AV
the board.
Notes on Noise Countermeasures: A protection circuit connected to prevent damage due to an
abnormal voltage such as an excessive surge at the analog input pins (AN0 to AN7) and analog
reference power supply (V
14.7.
Also, the bypass capacitors connected to AV
to AN7 must be connected to AV
If a filter capacitor is connected as shown in figure 14.7, the input currents at the analog input pins
(AN0 to AN7) are averaged, and so an error may arise. Also, when A/D conversion is performed
frequently, as in scan mode, if the current charged and discharged by the capacitance of the
sample-and-hold circuit in the A/D converter exceeds the current input via the input impedance
(R
when deciding the circuit constants.
Rev. 4.00 Feb 15, 2006 page 524 of 900
REJ09B0291-0400
in
), an error will arise in the analog input pin voltage. Careful consideration is therefore required
Notes:
*
1
Values are reference values.
1.
2. R
*
1
10 µF
in
Figure 14.7 Example of Analog Input Protection Circuit
: Input impedance
ref
ref
R
), and analog power supply (AV
) should be connected between AV
in
SS
*
) should be connected at one point to a stable digital ground (V
2
0.01 µF
SS
.
100
0.1 µF
CC
and V
ref
and the filter capacitor connected to AN0
AV
V
AN0 to AN7
AV
ref
CC
SS
CC
) by the analog ground (AV
CC
and AV
SS
as shown in figure
SS
).
SS
) on