SX8724C Datasheet, PDF (46/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

ADVANCED COMMUNICATIONS & SENSING
10.2.4 Mode Registers
SX8724C
ZoomingADC for sensing data acquisition
DATASHEET
Table 36. RegMode[0x70]
Bit
Name
7
-
6
-
5:4
Chopper
3
MultForceOn
2
MultForceOff
1
VrefD0Out
0
VrefD1In
Mode
r
r
rw
rw
rw
rw
rw
Reset
1
0
00
0
1
0
0
Description
reserved
reserved
V_REF chopping control. Note 1
11 : Chop at NELCONV/2 rate
10 : Chop at NELCONV rate
01 : Chop state=1
00 : Chop state=0
Force charge pump On. Takes priority. Note 2
Force charge pump Off. Note 2
Enable VREF output on D0 pin
Enable external VREF on D1 pin
(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 4.2V or Off when VBATT supply is above 4.2V. 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 4.2V and internal charge pump forced Off.
Revision 1.01
© Semtech
January 2011
Page 46
www.semtech.com/products/