DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 676

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 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: HD64F2148ATE20; HD64F2148ATE20

Section 20 A/D Converter
20.6
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. Digital input voltage range
3. Relation between AV
4. Setting Range of AVref Pin:
If conditions 1 to 4 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 (AVref), and analog power supply (AVCC) by the analog ground (AVSS).
Also, the analog ground (AVSS) should be connected at one point to a stable digital ground (VSS)
on 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) or analog reference power supply pin (AVref) should
be connected between AVCC and AVSS as shown in figure 20.7.
Rev. 4.00 Sep 27, 2006 page 630 of 1130
REJ09B0327-0400
The voltage applied to the ANn analog input pins during A/D conversion should be in the
range AV
The voltage applied to the CINn digital input pins should be in the range AV
and V
As the relationship between AV
not used, the AVCC and AVSS pins must on no account be left open.
The reference voltage supplied via the AVref pin should be in the range AV
SS
Usage Notes
SS
CINn
ANn
V
CC
AV
CC
(n = 0 to 15).
, AV
ref
(n = 0 to 7).
SS
and V
CC
, AV
CC
, V
SS
and V
SS
CC
, V
SS
, set AV
SS
= V
SS
. If the A/D converter is
ref
SS
AV
CINn
CC
.
AV
ref