DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 586

• 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: -

shown in figure 18.7. Also, the bypass capacitors connected to AVcc and the filter capacitor
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.
Table 18.6 Analog Pin Specifications
Rev.2.00 May. 28, 2009 Page 546 of 732
REJ09B0059-0200
Item
Analog input capacitance
Permissible signal source impedance
Notes:
*
1
Values are reference values.
1.
2. R
*
1
10 µF
in
: Input impedance
Figure 18.7 Example of Analog Input Protection Circuit
R
in
*
2
0.01 µF
100
0.1 µF
—
—
Min.
AV
Vref
AN0 to AN15
AV
CC
SS
5
Max.
20
in
), an error will arise in
Unit
pF
kΩ