HD64F3684FP Renesas Electronics America, HD64F3684FP Datasheet - Page 382

IC H8 MCU FLASH 32K 64LQFP

HD64F3684FP

Manufacturer Part Number
HD64F3684FP
Description
IC H8 MCU FLASH 32K 64LQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300H Tinyr
Datasheet

Specifications of HD64F3684FP

Core Processor
H8/300H
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SCI
Peripherals
PWM, WDT
Number Of I /o
45
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
64-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-

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Section 18 A/D Converter
18.6
18.6.1
This LSI's analog input is designed such that conversion accuracy is guaranteed for an input signal
for which the signal source impedance is 5 k 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 k , charging may be insufficient and it may not be
possible to guarantee A/D conversion accuracy. However, for A/D conversion in single mode with
a large capacitance provided externally, the input load will essentially comprise only the internal
input resistance of 10 k , 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/ s or greater) (see figure 18.6). When converting a high-speed
analog signal or converting in scan mode, a low-impedance buffer should be inserted.
18.6.2
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.
Rev.5.00 Nov. 02, 2005 Page 348 of 500
REJ09B0027-0500
Usage Notes
Permissible Signal Source Impedance
Influences on Absolute Accuracy
Sensor input
Figure 18.6 Analog Input Circuit Example
Sensor output
impedance
up to 5 k
Low-pass
filter
C to 0.1 F
This LSI
C
15 pF
in
=
A/D converter
equivalent circuit
10 k
20 pF

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