PIC32MX320F032H_11 Datasheet, PDF (123/214 Pages) Microchip Technology – High-Performance, General Purpose and USB, 32-bit Flash Microcontrollers

PIC32MX3XX/4XX
22.0 10-BIT ANALOG-TO-DIGITAL
CONVERTER (ADC)
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family of
devices. It is not intended to be a compre-
hensive reference source. Refer to Sec-
tion 17. “10-bit Analog-to-Digital
Converter (ADC)” (DS61104) of 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 PIC32MX3XX/4XX 10-bit Analog-to-Digital
Converter (ADC) includes the following features:
• Successive Approximation Register (SAR)
conversion
• Up to 1000 kilo samples per second (ksps)
conversion speed
• Up to 16 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 16 analog input pins,
designated AN0-AN15. In addition, there are two ana-
log input pins for external voltage reference connec-
tions. These voltage reference inputs may be shared
with other analog input pins and may be common to
other analog module references.
The analog inputs are connected through two multi-
plexers (MUXs) to one SHA. The analog input MUXs
can be switched between two sets of analog inputs
between conversions. Unipolar differential conversions
are possible on all channels, other than the pin used as
the reference, using a reference input pin (see
Figure 22-1).
The Analog Input Scan mode sequentially converts
user-specified channels. A control register specifies
which analog input channels will be included in the
scanning sequence.
The 10-bit ADC is connected to a 16-word result buffer.
Each 10-bit result is converted to one of eight, 32-bit
output formats when it is read from the result buffer.
FIGURE 22-1:
ADC1 MODULE BLOCK DIAGRAM
VREF+⁽¹⁾ AVDD VREF-⁽¹⁾ AVSS
AN0
AN15
S/H
CHANNEL
SCAN
+
CH0SA<4:0>
CH0SB<4:0>
-
CSCNA
AN1
VREFL
CH0NA CH0NB
Alternate
Input Selection
Note 1: VREF+, VREF- inputs can be multiplexed with other analog inputs.
VCFG<2:0>
VREFH
VREFL
SAR ADC
ADC1BUF0
ADC1BUF1
ADC1BUF2
ADC1BUFE
ADC1BUFF
© 2011 Microchip Technology Inc.
DS61143H-page 123