DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 584
DF2437FV
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
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2437FV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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18.7
18.7.1
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.
18.7.2
This LSI’s analog input is designed so that 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
input capacitance of the A/D converter’s sample-and-hold circuit 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 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 18.6). When converting a
high-speed analog signal or performing conversion in scan mode, a low-impedance buffer should
be inserted.
Rev.2.00 May. 28, 2009 Page 544 of 732
REJ09B0059-0200
Sensor input
Usage Notes
Module Stop Mode Setting
Permissible Signal Source Impedance
Sensor output
impedance
Up to 10 kΩ
Low-pass
filter
C to 0.1 μF
Figure 18.6 Example of Analog Input Circuit
This LSI
Cin =
15 pF
Equivalent circuit of A/D converter
10 kΩ
20 pF
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