DF2117VT20V Renesas Electronics America, DF2117VT20V Datasheet - Page 783

• 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
22.7.1
The A/D converter operation can be enabled or disabled using the module stop control register.
With the initial setting, the A/D converter is stopped. Register access is enabled by canceling
module stop mode. For details, see section 26, Power-Down Modes.
22.7.2
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 5 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 5 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 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., voltage fluctuation ratio of 5 mV/µs or greater) (see figure 22.5).
When converting a high-speed analog signal or converting in scan mode, a low-impedance buffer
should be inserted.
Usage Notes
Module Stop Mode Setting
Permissible Signal Source Impedance
Sensor input
Sensor output
impedance
Up to 5 kΩ
Low-pass
filter C
Up to 0.1 µF
Figure 22.5 Example of Analog Input Circuit
This LSI
C
10 pF
in
=
A/D converter equivalent circuit
Rev. 2.00 Sep. 28, 2009 Page 741 of 994
10 kΩ
20 pF
REJ09B0452-0200