DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 655

• Manufacturer Part Number: DF2148BTE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148BTE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SCI, X-Bus
• Peripherals: 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): 4.5 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: HD64F2148BTE20; HD64F2148BTE20

21.7.3
If conditions shown below are not met, the reliability of this LSI may be adversely affected.
21.7.4
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 (AN0 to AN7), analog reference voltage
(AV
(AV
21.7.5
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 voltage (AV
connected between AVcc and AVss as shown in figure 21.8. Also, the bypass capacitors
connected to AVcc and AV
connected to AV
If a filter capacitor is connected, 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
the analog input pin voltage. Careful consideration is therefore required when deciding the circuit
constants.
Analog input voltage range
The voltage applied to analog input pin ANn during A/D conversion should be in the range
AVss
Digital input voltage range
The voltage applied to digital input pin CINn should be in the range AVss CINn
and Vss
Relation between AVcc, AVss and Vcc, Vss
For the relationship between AVcc, AVss and Vcc, Vss, set AVss = Vss. If the A/D converter
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 AVref
ref
SS
), and analog power supply (AV
) should be connected at one point to a stable digital ground (V
Setting Range of Analog Power Supply and Other Pins
Notes on Board Design
Notes on Noise Countermeasures
ANn
CINn
SS
.
AVref (n = 0 to 7).
Vcc (n = 0 to 15).
ref
, and the filter capacitor connected to AN2 to AN7, must be
CC
) by the analog ground (AV
Rev. 3.00 Mar 21, 2006 page 599 of 788
SS
). Also, the analog ground
SS
) on the board.
Section 21 A/D Converter
in
AVcc.
), an error will arise in
ref
REJ09B0300-0300
) should be
AVref