PIC32MX3XX/4XX
22.0
10-BIT ANALOG-TO-DIGITAL
?
Automatic Channel Scan mode
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-
?
?
?
?
?
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
tion 17. “10-bit Analog-to-Digital
Converter (ADC)” (DS61104) of the
“PIC32MX 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 avail-
able on all devices. Refer to Section 4.0
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)
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
V REF + (1) AV DD
V REF - (1) AV SS
AN0
VCFG<2:0>
ADC1BUF0
CHANNEL
SCAN
CH0SA<4:0>
AN15
CH0SB<4:0>
+
-
S/H
V REFH
SAR ADC
V REFL
ADC1BUF1
ADC1BUF2
CSCNA
AN1
V REFL
CH0NA CH0NB
Alternate
Input Selection
ADC1BUFE
ADC1BUFF
Note
1:
V REF +, V REF - inputs can be multiplexed with other analog inputs.
? 2010 Microchip Technology Inc.
DS61143G-page 121
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