參數(shù)資料
型號(hào)： M38067ECAFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP80
封裝： 0.80 MM PITCH, PLASTIC, QFP-80
文件頁(yè)數(shù)： 22/60頁(yè)
文件大?。?/td> 712K
代理商： M38067ECAFP
MITSUBISHI MICROCOMPUTERS
3806 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
26
D-A Converter
The 3806 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 (DA1/P56 or DA2/P57) 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 P56/DA1 and P57/
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 4.0 V or more when using the D-A converter.
Fig. 20 Block diagram of D-A converter
Fig. 21 Equivalent connection circuit of D-A converter
P56/DA1
D-A1 conversion register (8)
R-2R resistor ladder
DA1 output enable bit
P57/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
P56/DA1
D-A1 conversion
register
DA1 output enable bit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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