C2510Fx / CC2511Fx
13.10
13.10.1
ADC
ADC Introduction
•
Eight individual input channels, single-
ended or differential (
CC2511Fx
has only
six channels)
•
Reference
voltage
selectable
as
internal, external single ended, external
differential, or AVDD.
•
Interrupt request generation
•
DMA triggers at end of conversions
•
Temperature sensor input
•
Battery measurement capability
The ADC supports up to 12-bit analog-to-
digital conversion. The ADC includes an
analog multiplexer with up to eight individually
configurable channels, reference voltage
generator, and conversion results written to
memory through DMA. Several modes of
operation are available.
The main features of the ADC are as follows:
•
Selectable decimation rates which also
sets the resolution (7 to 12 bits).
Figure 38: ADC Block Diagram
13.10.2
ADC Operation
To configure a P0 pin to be used as an ADC
input the corresponding bit in the
ADCCFG
register must be set to 1. The default value in
this register disables the ADC inputs. Please
see Section 13.4.7 on Page 92 for more details
on how to configure the ADC input pins. In the
following these port pin will be referred to as
the AIN0 - AIN7 pins. The ADC can be set up
to automatically perform a sequence of
conversions and optionally perform an extra
conversion.
It is possible to configure the inputs as single-
ended or differential inputs. In the case where
differential inputs are selected, the differential
inputs consist of the input pairs AIN0 - AIN1,
AIN2 - AIN3, AIN4 - AIN5, and AIN6 - AIN7.
Note that neither a negative supply, nor a
supply larger than VDD (unregulated power)
can be applied to these pins. It is the
difference between the pairs that are
converted in differential mode.
This section describes the general setup and
operation of the ADC and describes the usage
of the ADC control and status registers
accessed by the CPU.
13.10.2.1 ADC Core
The ADC is capable of converting an analog
input into a digital representation with up to 12
bits resolution. The ADC uses a selectable
positive reference voltage.
13.10.2.2 ADC Inputs
The signals on the P0 port pins can be used as
ADC inputs.
Note: P0_6 and P0_7 do not exist on
CC2511Fx
, hence only six input channels are
available (AIN0 – AIN5)
SWRS055D
Page 140 of 243
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