DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 522

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

13.7.4
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
13.7.5
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 signals (AN0 to AN7), and analog power supply
(AVcc) by the analog ground (AVss). Also, the analog ground (AVss) should be connected at one
point to a stable ground (Vss) on the board.
Rev. 5.00 Mar. 06, 2009 Page 502 of 770
REJ09B0243-0500
The voltage applied to analog input pin ANn during A/D conversion should be in the range
AVss ≤ VAN ≤ AVref.
Set Vcc ≤ AVcc ≤ 5.5V, AVss = Vss for 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.
Range of Analog Power Supply and Other Pin Settings
Notes on Board Design
Sensor input
Sensor output
impedance of
up to 3 kΩ or
up to 1 kΩ
Low-pass
filter
C to 0.1 μF
Figure 13.7 Example of Analog Input Circuit
This LSI
C
20 pF
in
=
A/D converter
equivalent circuit
10 kΩ
20 pF