Datasheet

 2012-2013 Microchip Technology Inc. DS60001185C-page 231
PIC32MX330/350/370/430/450/470
22.0 10-BIT ANALOG-TO-DIGITAL
CONVERTER (ADC)
The 10-bit Analog-to-Digital Converter (ADC) includes
the following features:
• Successive Approximation Register (SAR)
conversion
• Up to 1 Msps conversion speed
• Up to 28 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 22-1. The 10-bit ADC has up to 28 analog input
pins, designated AN0-AN27. 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 22-1: ADC1 MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX330/350/370/430/450/
470 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)”
(DS60001104) 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.
SAR ADC
S&H
ADC1BUF0
ADC1BUF1
ADC1BUF2
ADC1BUFF
ADC1BUFE
IV
REF
(3)
CTMUT
(2)
AN1
VREFL
CH0SB<4:0>
CH0NA CH0NB
+
-
CH0SA<4:0>
Channel
Scan
CSCNA
Alternate
V
REF+
(1)
AVDD AVSS
VREF-
(1)
Note 1: VREF+ and VREF- inputs can be multiplexed with other analog inputs.
2: Connected to the CTMU module. See Section 25.0 “Charge Time Measurement Unit (CTMU)” for more
information.
3: See Section 24.0 “Comparator Voltage Reference (CV
REF)” for more information.
4: This selection is only used with CTMU capacitive and time measurement.
Input Selection
V
REFH
VREFL
VCFG<2:0>
AN27
AN0
Open
(4)
CTMUI
(3)