參數(shù)資料
型號(hào)： SX8725E083TRT
元件分類： ADC
英文描述： 3-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO12
封裝： 4 X 4 MM, ROHS COMPLIANT, MLPD-12
文件頁(yè)數(shù)： 26/53頁(yè)
文件大小： 3966K
代理商： SX8725E083TRT
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
32
SX8725
ZoomingADC for Pressure and Temperature Sensing
Optional Operating Modes: External Voltage Reference Option
D0 and D1 are multi-functional pins with the following functions in different operating modes (see RegMode
register for control settings):
Figure 14 - D0 and D1 are Digital Inputs /
Outputs
Figure 15 - D0 is Digital Input / Output and D1
Reference Voltage Input
Figure 16 - D0 is Reference Voltage Output and
D1 is Digital Input / Output
Figure 17 - D0 is Reference Voltage Output and
D1 is Reference Voltage Input
This allows external monitoring of the internal bandgap reference or the ability to use an external reference input
for the ADC, or the option to filter the internal VREF output before feeding back as VREF,ADC input.
The internally generated VREF is a trimmed bandgap reference with a nominal value of 1.22V.
When using an external VREF,ADC input, it may have any value between 0V and VBATT. Simply substitute
the external value for 1.22 V in the ADC conversion calculations.
V
REF
+
-
D1/REF
IN
D0/REF
OUT
RegMode[0] = 0
0
1
RegMode[1] = 0
0
1
0
1
GPIO
ZoomingADC
GPIO
V
REF
+
-
D1/REF
IN
D0/REF
OUT
RegMode[0] = 1
0
1
RegMode[1] = 0
0
1
0
1
GPIO
ZoomingADC
GPIO
V
REF
+
-
D1/REF
IN
D0/REF
OUT
RegMode[0] = 0
0
1
RegMode[1] = 1
0
1
0
1
GPIO
ZoomingADC
GPIO
V
REF
+
-
D1/REF
IN
D0/REF
OUT
RegMode[0] = 1
0
1
RegMode[1] = 1
0
1
0
1
GPIO
ZoomingADC
GPIO
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