DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 581

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

16.6
The following points should be noted when using the A/D converter.
Setting Range of Analog Power Supply and Other Pins:
(1) Analog input voltage range
(2) Relation between AV
(3) V
Note:If conditions (1), (2), and (3) above are not met, the reliability of the device may be adversely affected.
Notes on Board Design: 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 (AN0 to AN7), analog reference power supply (V
and analog power supply (AV
one point to a stable digital ground (V
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
between AV
Also, the bypass capacitors connected to AV
connected to AV
If a filter capacitor is connected as shown in figure 16-7, 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
required when deciding the circuit constants.
The voltage applied to analog input pins AN0 to AN7 during A/D conversion should be in the range AV
V
As the relationship between AV
AV
The analog reference voltage input at the V
ref
ref
.
SS
input range
pins must on no account be left open.
Usage Notes
CC
and AV
SS
.
SS
CC
as shown in figure 16-7.
in
, AV
), an error will arise in the analog input pin voltage. Careful consideration is therefore
CC
SS
) by the analog ground (AV
and V
CC
, AV
SS
) on the board.
CC
, V
SS
and V
CC
SS
ref
and V
pin set in the range V
CC
, V
ref
SS
and the filter capacitor connected to AN0 to AN7 must be
, set AV
SS
). Also, the analog ground (AV
SS
= V
ref
SS
. If the A/D converter is not used, the AV
AV
CC
.
Rev.6.00 Oct.28.2004 page 551 of 1016
SS
) should be connected at
ref
) should be connected
REJ09B0138-0600H
SS
ANn
CC
and
ref
),