DF2505FC26V Renesas Electronics America, DF2505FC26V Datasheet - Page 578

• Manufacturer Part Number: DF2505FC26V
• Description: IC H8S/2505 MCU FLASH 144QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2505FC26V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 26MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 384KB (384K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 15 A/D Converter
15.8.4
If the conditions below are not met, the reliability of the device may be adversely affected.
• Analog input voltage range
• Relationship between AVcc, AVss and Vcc, Vss
• Vref range
15.8.5
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 AN15), 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.
15.8.6
A protection circuit should be connected in order to prevent damage due to abnormal voltage, such
as an excessive surge at the analog input pins (AN0 to AN15), between AVcc and AVss, as shown
Rev. 6.00 Sep. 24, 2009 Page 530 of 928
REJ09B0099-0600
The voltage applied to analog input pin ANn during A/D conversion should be in the range
AVss ≤ ANn ≤ AVcc.
Set AVss = Vss as the relationship between AVcc, AVss and Vcc, Vss. If the A/D converter is
not used, the AVcc and AVss pins must not be left open.
The reference voltage input from the Vref pin should be set to AVcc or less.
Range of Analog Power Supply and Other Pin Settings
Notes on Board Design
Notes on Noise Countermeasures
Sensor input
Sensor input
impedance
to 5 k Ω
Low-pass
filter
C to 0.1 μF
Figure 15.9 Example of Analog Input Circuit
This LSI
C
15 pF
in
=
10 kΩ
equivalent circuit
A/D converter
20 pF