DSPIC33FJ12MC202 Microchip Technology Inc., DSPIC33FJ12MC202 Datasheet - Page 201

• Manufacturer Part Number: DSPIC33FJ12MC202
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

19.0
The dsPIC33FJ12MC201/202 devices have up to 6
ADC module input channels.
The AD12B bit (ADxCON1<10>) allows each of the
ADC modules to be configured as either a 10-bit, 4-
sample-and-hold ADC (default configuration) or a 12-
bit, 1 sample-and-hold ADC.
19.1
The 10-bit ADC configuration has the following key
features:
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 1.1 Msps
• Up to 6 analog input pins
• External voltage reference input pins
• Simultaneous sampling of up to four analog input
• Automatic Channel Scan mode
• Selectable conversion trigger source
• Selectable Buffer Fill modes
• Four result alignment options (signed/unsigned,
• Operation during CPU Sleep and Idle modes
• 16-word conversion result buffer
The 12-bit ADC configuration supports all the above
features, except:
• In the 12-bit configuration, conversion speeds of
• There is only 1 sample-and-hold amplifier in the
© 2007 Microchip Technology Inc.
Note:
Note:
pins
fractional/integer)
up to 500 ksps are supported
12-bit configuration, so simultaneous sampling of
multiple channels is not supported.
10-BIT/12-BIT ANALOG-TO-
DIGITAL CONVERTER (ADC)
Key Features
This data sheet summarizes the features
of the dsPIC33FJ12MC201/202 devices.
It is not intended to be a comprehensive
reference source. To complement the
information in this data sheet, refer to the
“dsPIC33F Family Reference Manual”.
Please see the Microchip web site
(www.microchip.com)
dsPIC33F
chapters.
The ADC module must be disabled before
the AD12B bit can be modified.
Family
Reference
for
the
Manual
latest
Preliminary
dsPIC33FJ12MC201/202
Depending on the particular device pinout, the ADC
can have up to 6 analog input pins, designated AN0
through AN5. In addition, there are two analog input
pins for external voltage reference connections. These
voltage reference inputs can be shared with other
analog input pins.
The actual number of analog input pins and external
voltage reference input configuration will depend on the
specific device.
A block diagram of the ADC is shown in Figure 19-1.
19.2
To configure the ADC module:
1.
2.
3.
4.
5.
6.
7.
8.
Select
(ADxPCFGH<15:0> or ADxPCFGL<15:0>).
Select voltage reference source to match
expected
(ADxCON2<15:13>).
Select the analog conversion clock to match the
desired data rate with the processor clock
(ADxCON3<5:0>).
Determine how many sample-and-hold chan-
nels
ADxPCFGH<15:0> or ADxPCFGL<15:0>).
Select
sequence
ADxCON3<12:8>).
Select the way conversion results are presented
in the buffer (ADxCON1<9:8>).
Turn on the ADC module (ADxCON1<15>).
Configure ADC interrupt (if required):
a)
b)
ADC Initialization
Clear the ADxIF bit.
Select the ADC interrupt priority.
will
the
port
be
range
appropriate
used
pins
(ADxCON1<7:5>
on
(ADxCON2<9:8>
as
sample/conversion
analog
DS70265B-page 199
analog
inputs
inputs
and
and