DF61654N50FTV Renesas Electronics America, DF61654N50FTV Datasheet - Page 799

• Manufacturer Part Number: DF61654N50FTV
• Description: IC H8SX/1654 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61654N50FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 75
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

17.7
17.7.1
Operation of the A/D converter can be disabled or enabled using the module stop control register.
The initial setting is for operation of the A/D converter to be halted. Register access is enabled by
clearing module stop mode. For details, refer to section 22, Power-Down Modes.
17.7.2
This LSI's analog input is designed so that the 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 the A/D conversion accuracy. However, if a large capacitance is
provided externally for conversion in single mode, the input load will essentially comprise only
the internal input resistance of 10 kΩ, and the signal source impedance is ignored. However, since
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 or conversion in scan mode, a low-impedance buffer should be inserted.
17.7.3
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 such as
AVss.
Care is also required to insure that digital signals on the board do not interfere with filter circuits
and filter circuits do not act as antennas.
Sensor input
Usage Notes
Module Stop Mode Setting
Permissible Signal Source Impedance
Influences on Absolute Accuracy
Sensor output
impedance
R
Low-pass
filter
C = 0.1 F
(recommended)
10 k
Figure 17.8 Example of Analog Input Circuit
This LSI
Cin =
15 pF
Equivalent circuit of the A/D converter
Rev.1.00 Sep. 08, 2005 Page 749 of 966
10 k
Section 17 A/D Converter
20 pF
REJ09B0219-0100