Functional Description - Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual

33.3 Functional Description

Analog node (ANODE) 0
Analog node (ANODE) 1
Analog node (ANODE) 2
Analog node (ANODE) 3
Switch control
An analog bus (ABUS) consists of analog switches connected to a common wire as shown in
1130. An APORT consists of multiple ABUSes. Since many clients can operate differentially, buses are grouped by pairs as X and Y. If
a given client uses a single ABUS (e.g. single-ended ADC), X and Y are just labels to differentiate the two buses.
When operating differentially, most APORT clients require that one input be chosen from an X bus and the other from a Y bus. For
example, the ACMP block will not allow both positive and negative inputs to be chosen from X buses.
33.3.1 I/O Pin Considerations
For external analog signals routed through the APORT, the maximum supported analog I/O voltage will typically be limited to the
MIN(V , IOVDD) (where V
ANALOGSUPPLY
IOVDD=1.8 V, the maximum supported analog IO voltage on APORT-routed signals will be limited to 1.8 V, regardless of the analog
module supply voltage.
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Figure 33.1. Analog Bus (ABUS)
is the supply pin powering the analog module). Practically, this means that if
ANALOGSUPPLY
Reference Manual
APORT - Analog Port
Analog bus (ABUS)
Figure 33.1 Analog Bus (ABUS) on page
Rev. 1.1 | 1130