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參數(shù)資料
| 型號： | M38020M1 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Output LDO, 800mA, Fixed(2.5V), Internal Current limit, Thermal Overload Protection 8-SON 0 to 125 |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 20/51頁 |
| 文件大?。?/td> | 692K |
| 代理商： | M38020M1 |
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MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
27
D-A Converter
The 3802 group has two internal D-A converters (DA1 and DA2)
with 8-bit resolutions.
The D-A converter is performed by setting the value in the D-A
conversion register. The result of D-A converter is output from the
DA1 or DA2 pin by setting the DA output enable bit to “1”.
When using the D-A converter, the corresponding port direction
register bit (P30/DA1 or P31/DA2) should be set to “0” (input sta-
tus).
The output analog voltage V is determined by the value n (base
10) in the D-A conversion register as follows:
V = VREF ! n/256 (n = 0 to 255)
Where VREF is the reference voltage.
At reset, the D-A conversion registers are cleared to “0016”, the DA
output enable bits are cleared to “0”, and the P30/DA1 and P31/
DA2 pins are set to input (high impedance).
The D-A output is not buffered, so connect an external buffer when
driving a low-impedance load.
Set VCC to 3.0 V or more when using the D-A converter.
Fig. 24 Block diagram of D-A converter
Fig. 25 Equivalent connection circuit of D-A converter
P30/DA1
D-A1 conversion register (8)
R-2R resistor ladder
DA1 output enable bit
P31/DA2
D-A2 conversion register (8)
R-2R resistor ladder
DA2 output enable bit
Data
bus
AVSS
VREF
"0"
"1"
MSB
"0"
"1"
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
LSB
2R
P30/DA1
D-A1 conversion
register
DA1 output enable bit
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