DF38602RFT10 Renesas Electronics America, DF38602RFT10 Datasheet - Page 393

• Manufacturer Part Number: DF38602RFT10
• Description: MCU 3V 16K 32-QFN
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H SLPr

Specifications of DF38602RFT10

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 10MHz
• Connectivity: I²C, IrDA, SCI, SSU
• Peripherals: POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F38602RFT10; HD64F38602RFT10

17.7
17.7.1
This LSI's analog input is designed such that conversion accuracy is guaranteed for an input signal
for which the signal source impedance is 10 kΩ or less. This specification is provided to enable
the A/D converter's sample-and-hold circuit input capacitance to be charged within the sampling
time; if the sensor output impedance exceeds 10 kΩ, charging may be insufficient and it may not
be possible to guarantee A/D conversion accuracy. However, with a large capacitance provided
externally, the input load will essentially comprise only the internal input resistance of 10 kΩ, and
the signal source impedance is ignored. However, as a low-pass filter effect is obtained in this
case, it may not be possible to follow an analog signal with a large differential coefficient (e.g., 5
mV/µs or greater) (see figure 17.8). When converting a high-speed analog signal, a low-
impedance buffer should be inserted.
17.7.2
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.
Care is also required to ensure that filter circuits do not interfere with digital signals or act as
antennas on the mounting board.
Usage Notes
Permissible Signal Source Impedance
Influences on Absolute Accuracy
Sensor input
Figure 17.8 Example of Analog Input Circuit
Sensor output
impedance
to 10 kΩ
Low-pass
filter
C to 0.1 µF
This LSI
C
15 pF
in
=
A/D converter
equivalent circuit
Rev. 3.00 May 15, 2007 Page 359 of 518
10 kΩ
48 pF
Section 17 A/D Converter
REJ09B0152-0300