DF61657CN35FTV Renesas Electronics America, DF61657CN35FTV Datasheet - Page 667

• Manufacturer Part Number: DF61657CN35FTV
• Description: IC H8SX/1657 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61657CN35FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 35MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 82
• Program Memory Size: 768KB (768K x 8)
• Program Memory Type: FLASH
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: 3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

15.7.6
A protection circuit connected to prevent damage due to an abnormal voltage such as an excessive
surge at the analog input pins (AN0 to AN7) should be connected between AVcc and AVss as
shown in figure 15.9. Also, the bypass capacitors connected to AVcc and the filter capacitor
connected to the AN0 to AN7 pins must be connected to AVss.
If a filter capacitor is connected, the input currents at the AN0 to AN7 pins 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
input pin voltage. Careful consideration is therefore required when deciding the circuit constants.
Table 15.6 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
Notes on Noise Countermeasures
Notes:
*
1
Figure 15.9 Example of Analog Input Protection Circuit
Values are reference values.
1.
2. R
*
1
10 µF
in
: Input impedance
R
in
*
2
0.01 µF
100 Ω
0.1 µF
Min


AV
Vref
AN0 to AN7
AV
CC
SS
Rev. 2.00 Jun. 28, 2007 Page 641 of 864
in
), an error will arise in the analog
Max
20
10
Section 15 A/D Converter
Unit
pF
kΩ
REJ09B0341-0200