DF2117VT20V Renesas Electronics America, DF2117VT20V Datasheet - Page 785

• Manufacturer Part Number: DF2117VT20V
• Description: MCU 16BIT FLASH 3V 160K 144-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2117VT20V

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: FIFO, I²C, LPC, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 112
• Program Memory Size: 160KB (160K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-TQFP, 144-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

22.7.6
A protection circuit connected to prevent damage of the analog input pins (AN0 to AN15) and
analog reference voltage pin (AVref) due to an abnormal voltage such as an excessive surge
should be connected between AVcc and AVss, as shown in figure 22.6. Also, the bypass
capacitors connected to AVcc and AVref, and the filter capacitors connected to AN0 to AN15
must be connected to AVss.
If a filter capacitor is connected, the input currents at the analog input pins (AN0 to AN15) 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.
Notes on Noise Countermeasures
Notes:
*
1
Figure 22.6 Example of Analog Input Protection Circuit
1.
2. R
Values are reference values.
*
1
10 µF
in
: Input impedance
R
in
*
2
0.01 µF
100 Ω
0.1 µF
AV
AV
AN0 to AN15
AV
CC
ref
SS
Rev. 2.00 Sep. 28, 2009 Page 743 of 994
in
), an error will arise in
REJ09B0452-0200