CC2430 Datasheet, PDF (127/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
13.7 ADC
13.7.1 ADC Introduction
The ADC supports up to 14-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 (8 to 13 bits).
• Eight individual input channels, single-
ended or differential
• Reference voltage selectable as
internal, external single ended,
external differential or AVDD_SOC.
• Interrupt request generation
• DMA triggers at end of conversions
• Temperature sensor input
• Battery measurement capability
AIN0
AIN7
VDD/3
TMP_SENSOR
input
mux
Sigma-delta
modulator
Decimation
filter
Int 1.25V
AIN7
ref
AVDD
mux
AIN6-AIN7
Clock generation and
control
Figure 26: ADC block diagram.
13.7.2 ADC Operation
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.
13.7.2.1 ADC Core
The ADC includes an ADC capable of
converting an analog input into a digital
representation with up to 13 bits
resolution. The ADC uses a selectable
positive reference voltage.
13.7.2.2 ADC Inputs
The signals on the P0 port pins can be
used as ADC inputs. In the following these
port pin will be referred to as the AIN0-
AIN7 pins. The input pins AIN0-AIN7 are
connected to the ADC. The ADC can be
set up to automatically perform a
sequence of conversions and optionally
perform an extra conversion from any
channel when the sequence is completed.
It is possible to configure the inputs as
single-ended or differential inputs. In the
case where differential inputs are selected,
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 127 of 232