SX8723
ZoomingADC™ for Pressure and Temperature Sensing
ADVANCED COMMUNICATIONS & SENSING
Over-Sampling Ratio
The over-sampling ratio (OSR) defines the number of integration cycles per elementary conversion. Its value is
set with the word SET_OSR[2:0] in power of 2 steps (see Table 11) given by:
OSR = 23+SET _ OSR[2:0]
Equation 13
SET_OSR[2:0]
(RegACCfg0[4:2])
000
001
010
011
100
101
110
111
Over-Sampling Ratio
OSR (-)
8
16
32
64
128
256
512
1024
Table 11 - Over-Sampling Ratio Settings
Elementary Conversions
As mentioned previously, the whole conversion sequence is made of a set of NELCONV elementary incremental
conversions. This number is set with the word SET_NELC[1:0] in power of 2 steps (see Table 12) given by:
N = 2 ELCONV
SET _ NELC [1:0]
Equation 14
SET_NELC[1:0]
(RegACCfg0[6:5])
00
01
10
11
# of Elementary
Conversions
NELCONV (-)
1
2
4
8
Table 12 - Number of Elementary Conversion Settings
As already mentioned, NELCONV must be equal or greater than 2 to reduce internal amplifier offsets.
V1.5 © 2007 Semtech Corp.
23
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