DSPIC30F2011CT-20I/SO View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'DSPIC30F2011CT-20I/SO' PDF : 206 Pages View PDF
dsPIC30F2011/2012/3012/3013
16.0 12-BIT ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
Note:
This data sheet summarizes features of
this group of dsPIC30F devices and is not
intended to be a complete reference
source. For more information on the CPU,
peripherals, register descriptions and gen-
eral device functionality, refer to the
“dsPIC30F Family Reference Manual”
(DS70046).
The 12-bit Analog-to-Digital Converter allows
conversion of an analog input signal to a 12-bit digital
number. This module is based on a Successive
Approximation Register (SAR) architecture and
provides a maximum sampling rate of 200 ksps. The
ADC module has up to 10 analog inputs which are
multiplexed into a sample and hold amplifier. The
output of the sample and hold is the input into the
converter which generates the result. The analog
reference voltage is software selectable to either the
device supply voltage (AVDD/AVSS) or the voltage level
on the (VREF+/VREF-) pin. The ADC has a unique
feature of being able to operate while the device is in
Sleep mode with RC oscillator selection.
The ADC module has six 16-bit registers:
• A/D Control Register 1 (ADCON1)
• A/D Control Register 2 (ADCON2)
• A/D Control Register 3 (ADCON3)
• A/D Input Select Register (ADCHS)
• A/D Port Configuration Register (ADPCFG)
• A/D Input Scan Selection Register (ADCSSL)
The ADCON1, ADCON2 and ADCON3 registers
control the operation of the ADC module. The ADCHS
register selects the input channels to be converted. The
ADPCFG register configures the port pins as analog
inputs or as digital I/O. The ADCSSL register selects
inputs for scanning.
Note:
The SSRC<2:0>, ASAM, SMPI<3:0>,
BUFM and ALTS bits, as well as the
ADCON3 and ADCSSL registers, must
not be written to while ADON = 1. This
would lead to indeterminate results.
FIGURE 16-1:
12-BIT ADC FUNCTIONAL BLOCK DIAGRAM
AVDD/VREF+
AVSS/VREF-
AN0
0000
AN1
0001
AN2
0010
AN3
0011
DAC
Comparator
12-bit SAR
Conversion Logic
AN4
0100
AN5
0101
AN6
0110
16-word, 12-bit
Dual Port
Buffer
AN7
0111
AN8
1000
Sample
AN9
1001
Sample/Sequence
Control
S/H CH0
Input
Switches
Input MUX
Control
© 2008 Microchip Technology Inc.
DS70139F-page 111
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