Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual page 855

SCANINPUTSEL
APORT-Channel
(Positive)
APORT-Channel
(Negative)
I/O Differential
SCANMASK
SCANINPUTID
In certain applications it may be desirable to perform differential conversions on several channels against a common voltage. The
ADCn_SCANNEGSEL register allows eight of the SCANINPUTIDs to re-map the negative terminal of a differential conversion to a
common channel. In the first ADCn_SCANINPUTSEL group, the negative input for SCANINPUT 0, 2, 4, and 6 may be re-mapped to
any of the odd-numbered channels in that group (SCANINPUT 1, 3, 5, or 7). Likewise, in the second ADCn_SCANINPUTSEL group,
the negative input for SCANINPUT 9, 11, 13, and 15 may be re-mapped to any of the even-numbered channels in that group (SCANIN-
PUT 8, 10, 12, or 14).
Figure 26.8 ADC Differential Scan Mode Re-mapping Negative Input Selections on page 855
NEGSEL register on the re-mappable inputs. The left side of the figure shows the default channel mapping, and the right side of the
figure shows how ADCn_SCANNEGSEL can be programmed to map the same negative input on up to four channels.
SCANINPUTSEL
APORT-Channel
(Positive)
APORT-Channel
(Negative)
SCANNEGSEL
I/O Differential
SCANINPUTID
Figure 26.8. ADC Differential Scan Mode Re-mapping Negative Input Selections
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APORT1CH16TO23 APORT1CH16TO23
0 0 0 0 0 0 0 0 0 0
31 24 23
Figure 26.7. ADC Differential Scan Mode Example
Default SCANNEGSEL Selections
APORT1CH16TO23 APORT1CH16TO23
0 3 2 1 3
15 8 7
APORT4CH8TO15
0 0 0 0 0 0 0 0 0 1 0
16 15
Re-mapped using SCANNEGSEL
APORT1CH16TO23
2 1 0 3 3
0 15
Reference Manual
ADC - Analog to Digital Converter
APORT1CH16TO23
0 0 0 0 0 0 0 0 1 0
8 7
shows the effects of the ADCn_SCAN-
APORT1CH16TO23
1 1 0 0 0 0
8 7
1
0
0
Rev. 1.1 | 855