pic32mx320f032h Microchip Technology Inc., pic32mx320f032h Datasheet - Page 95

• Manufacturer Part Number: pic32mx320f032h
• Description: 64/100-pin General Purpose And Usb 32-bit Flash Microcontrollers
• Manufacturer: Microchip Technology Inc.

22.0
The PIC32MX3XX/4XX 10-bit Analog-to-Digital (A/D)
converter (or ADC) includes the following features:
• Successive Approximation Register (SAR)
• Up to 1000 kilo samples per second (ksps)
• Up to 16 analog input pins
• External voltage reference input pins
• One unipolar, differential Sample-and-Hold
• 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
FIGURE 22-1:
© 2009 Microchip Technology Inc.
Note:
conversion
conversion speed
Amplifier (SHA)
Note
CH0SA<4:0>
CHANNEL
SCAN
1:
CONVERTER (ADC)
10-BIT ANALOG-TO-DIGITAL
reference source. Refer to the “PIC32MX
description of this peripheral.
This data sheet summarizes the features of
the PIC32MX3XX/4XX family of devices. It
is not intended to be a comprehensive
Family Reference Manual” Section 17.
“10-bit
(ADC)”
The manual is available from the Microchip
web site (www.Microchip.com/PIC32).
V
V
REF
REFL
AN1
AN15
+, V
AN0
CH0NA CH0NB
CSCNA
REF
Analog-to-Digital
(DS61104)
- inputs can be multiplexed with other analog inputs.
ADC1 MODULE BLOCK DIAGRAM
CH0SB<4:0>
Input Selection
Alternate
for
a
+
-
Converter
detailed
Preliminary
A block diagram of the 10-bit ADC is shown 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
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.
S/H
PIC32MX3XX/4XX
V
REF
+
V
(1)
REFH
channels,
AV
VCFG<2:0>
SAR ADC
DD
V
REF
other than the pin used as
V
-
REFL
(1)
AV
SS
DS61143F-page 93
ADC1BUFE
ADC1BUFF
ADC1BUF0
ADC1BUF1
ADC1BUF2