DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 585

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

18.7.3
Adding capacitance results in coupling with GND, and therefore noise in GND may adversely
affect absolute accuracy. Be sure to make the connection to an electrically stable GND such as
AVss.
Care is also required to insure that filter circuits do not interfere with digital signals on the
mounting board, so acting as antennas.
18.7.4
If conditions shown below are not met, the reliability of the LSI may be adversely affected.
• Analog input voltage range
• Relation between AVcc, AVss and Vcc, Vss
• Vref setting range
18.7.5
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 pins (AN0 to AN15), analog
reference power supply (Vref), and analog power supply voltage (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.
18.7.6
A protection circuit connected to prevent damage due to an abnormal voltage such as an excessive
surge at the analog input pins (AN0 to AN15) should be connected between AVcc and AVss as
The voltage applied to analog input pin ANn during A/D conversion should be in the range
AVss ≤ ANn ≤ Vref.
For the relationship between AVcc, AVss and Vcc, Vss, set AVcc ≥ Vcc and AVss = Vss. If
the A/D converter is not used, the AVcc and AVss pins must not be open.
The reference voltage at the Vref pin should be set in the range Vref ≤ AVcc.
Notes on Noise Countermeasures
Influences on Absolute Accuracy
Setting Range of Analog Power Supply and Other Pins
Notes on Board Design
Rev.2.00 May. 28, 2009 Page 545 of 732
REJ09B0059-0200