參數(shù)資料
型號(hào)： M30201M2
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁(yè)數(shù)： 89/159頁(yè)
文件大?。?/td> 2319K
代理商： M30201M2
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Unde
A-D Converter
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
89
Item
Performance
Method of A-D conversion Successive approximation (capacitive coupling amplifier)
Analog input voltage (Note 1)
0V to AV
CC
(V
CC
)
Operating clock
φ
AD
(Note 2)
V
CC
= 5V
f
AD
, divide-by-2 of f
AD
, divide-by-4 of f
AD
, f
AD
=f(X
IN
)
V
CC
= 3V
divide-by-2 of f
AD
, divide-by-4 of f
AD
, f
AD
=f(X
IN
)
Resolution
8-bit or 10-bit (selectable)
Absolute precision
V
CC
= 5V
Without sample and hold function
±
3LSB
With sample and hold function (8-bit resolution)
±
2LSB
With sample and hold function (10-bit resolution)
±
3LSB
V
CC
= 3V
Without sample and hold function (8-bit resolution)
±
2LSB
Operating modes
One-shot mode, repeat mode, single sweep mode, repeat sweep mode 0,
and repeat sweep mode 1
Analog input pins
8 pins (AN
0
to AN
7
) + 5 pins (AN
50
to AN
54
)
A-D conversion start condition
Software trigger
A-D conversion starts when the A-D conversion start flag changes to “1”
Conversion speed per pin Without sample and hold function
8-bit resolution: 49
φ
AD
cycles
,
10-bit resolution: 59
φ
AD
cycles
With sample and hold function
8-bit resolution: 28
φ
AD
cycles
,
10-bit resolution: 33
φ
AD
cycles
Note 1: Does not depend on use of sample and hold function.
Note 2: Without sample and hold function, set the
φ
AD
frequency to 250kHz min.
With the sample and hold function, set the
φ
AD
frequency to 1MHz min.
A-D Converter
The A-D converter consists of one 10-bit successive approximation A-D converter circuit with a capacitive
coupling amplifier. Pins P6
0
to P6
7
, and P5
0
to P5
4
also function as the analog signal input pins. The
direction registers of these pins for A-D conversion must therefore be set to input. The Vref connect bit (bit
5 at address 03D7
16
) can be used to isolate the resistance ladder of the A-D converter from the reference
voltage input pin (V
REF
) when the A-D converter is not used. Doing so stops any current flowing into the
resistance ladder from V
REF
, reducing the power dissipation. When using the A-D converter, start A-D
conversion only after setting bit 5 of 03D7
16
to connect V
REF
.
The result of A-D conversion is stored in the A-D registers of the selected pins. When set to 10-bit precision,
the low 8 bits are stored in the even addresses and the high 2 bits in the odd addresses. When set to 8-bit
precision, the low 8 bits are stored in the even addresses.
Table 1.30 shows the performance of the A-D converter. Figure 1.82 shows the block diagram of the A-D
converter, and Figures 1.83 and 1.84 show the A-D converter-related registers.
Table 1.30. Performance of A-D converter
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