參數(shù)資料
型號: 37C672
廠商: SMSC Corporation
英文描述: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
中文描述: 增強(qiáng)的超級I / O控制器,快速紅外線
文件頁數(shù): 115/173頁
文件大小: 965K
代理商: 37C672
1-31
HARDWARE
3802 GROUP USER’S MANUAL
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. 32 Block diagram of D-A converter
Fig. 33 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
FUNCTIONAL DESCRIPTION
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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