PIC32MX1XX_12 Datasheet, PDF (201/328 Pages) Microchip Technology – 32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

PIC32MX1XX/2XX
21.0 10-BIT ANALOG-TO-DIGITAL
CONVERTER (ADC)
Note 1: This data sheet summarizes the features
of the PIC32MX1XX/2XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 17. “10-bit
Analog-to-Digital Converter (ADC)”
(DS61104) in the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
The PIC32MX1XX/2XX 10-bit Analog-to-Digital
Converter (ADC) includes the following features:
• Successive Approximation Register (SAR)
conversion
• Up to 1 Msps conversion speed
• Up to 13 analog input pins
• External voltage reference input pins
• One unipolar, differential Sample and Hold
Amplifier (SHA)
• Automatic Channel Scan mode
• Selectable conversion trigger source
• 16-word conversion result buffer
• Selectable buffer fill modes
• Eight conversion result format options
• Operation during CPU Sleep and Idle modes
A block diagram of the 10-bit ADC is illustrated in
Figure 21-1. The 10-bit ADC has up to 13 analog input
pins, designated AN0-AN12. In addition, there are two
analog input pins for external voltage reference
connections. These voltage reference inputs may be
shared with other analog input pins and may be
common to other analog module references.
FIGURE 21-1:
ADC1 MODULE BLOCK DIAGRAM
CTMUI⁽³⁾
AN0
VREF+⁽¹⁾ AVDD VREF-⁽¹⁾ AVSS
AN12⁽²⁾
CTMUT⁽³⁾
IVREF⁽⁴⁾
Open⁽⁵⁾
Channel
Scan
+
CH0SA<4:0>
CH0SB<4:0>
-
CSCNA
AN1
VREFL
S&H
VCFG<2:0>
VREFH
VREFL
SAR ADC
ADC1BUF0
ADC1BUF1
ADC1BUF2
ADC1BUFE
ADC1BUFF
CH0NA CH0NB
Alternate
Input Selection
Note 1:
2:
3:
4:
5:
VREF+ and VREF- inputs can be multiplexed with other analog inputs.
AN8 is only available on 44-pin devices. AN6 and AN7 are not available on 28-pin devices.
Connected to the CTMU module. See Section 24.0 “Charge Time Measurement Unit (CTMU)” for more
information.
See Section 23.0 “Comparator Voltage Reference (CVREF)” for more information.
This selection is only used with CTMU capacitive and time measurement.
 2011-2012 Microchip Technology Inc.
Preliminary
DS61168E-page 201