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SX8725S Datasheet(PDF) 48 Page - Semtech Corporation

Part # SX8725S
Description  ZoomingADC for sensing data acquisition ADVANCED COMMUNICATIONS & SENSING
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8725S Datasheet(HTML) 48 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725S
ZoomingADC for sensing data acquisition
Revision 1.0
February 2011
© Semtech
10.2.5 Mode Registers
(1)
The chop control is to allow chopping of the internal bandgap reference. This may be useful to help eliminate bandgap related internal
offset voltage and 1/f noise. The bandgap chop state may be forced High or Low, or may be set to toggle during conversion at either the
same rate or half the rate of the Elementary Conversion. (See Conversion Sequence in the ZoomingADC description).
(2)
The internal charge pump may be forced On when VBATT supply is below 3V or Off when VBATT supply is above 3V. Enabling the charge
pump increase the current consumption. If the ADC is not being run at full rate or full accuracy then it may operate sufficiently well when
VBATT is less than 3V and internal charge pump forced Off.
Table 34.
RegMode[0x70]
Bit
Name
Mode
Reset
Description
7
-
r1
reserved
6
-
r0
reserved
5:4
Chopper
rw
00
VREF chopping control. Note 1
11 : Chop at NELCONV/2 rate
10 : Chop at NELCONV rate
01 : Chop state=1
00 : Chop state=0
3
MultForceOn
rw
0
Force charge pump On. Takes priority. Note 2
2
MultForceOff
rw
1
Force charge pump Off. Note 2
1
VrefD0Out
rw
0
Enable VREF output on D0 pin
0
VrefD1In
rw
0
Enable external VREF on D1 pin


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