sx8725 Semtech Corporation, sx8725 Datasheet - Page 32

• Manufacturer Part Number: sx8725
• Description: Sx8725 Zoomingadc? For Pressure And Temperature Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & 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):
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 V
The internally generated V
When using an external V
the external value for 1.22 V in the ADC conversion calculations.
V1.5 © 2007 Semtech Corp.
D0/REF
D0/REF
D1/REF
D1/REF
Figure 15 - D0 is Digital Input / Output and D1
Figure 14 - D0 and D1 are Digital Inputs /
OUT
OUT
IN
IN
V
V
Reference Voltage Input
REF
REF
+
+
-
-
RegMode[1] = 0
RegMode[1] = 0
Outputs
0
1
0
1
REF
REF,ADC
RegMode[0] = 0
RegMode[0] = 1
is a trimmed bandgap reference with a nominal value of 1.22V.
0
1
1
0
0
1
1
0
input, it may have any value between 0V and V
ZoomingADC™ for Pressure and Temperature Sensing
GPIO
ZoomingADC
GPIO
GPIO
ZoomingADC
GPIO
REF
output before feeding back as V
32
D0/REF
Figure 16 - D0 is Reference Voltage Output and
D0/REF
Figure 17 - D0 is Reference Voltage Output and
D1/REF
D1/REF
OUT
OUT
IN
IN
D1 is Reference Voltage Input
D1 is Digital Input / Output
V
V
REF
REF
+
+
-
-
RegMode[1] = 1
RegMode[1] = 1
REF,ADC
0
1
0
1
BATT
input.
RegMode[0] = 0
RegMode[0] = 1
. Simply substitute
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0
1
1
0
0
1
1
0
SX8725
GPIO
ZoomingADC
GPIO
GPIO
ZoomingADC
GPIO