pic24hj12gp202 Microchip Technology Inc., pic24hj12gp202 Datasheet - Page 153

• Manufacturer Part Number: pic24hj12gp202
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

17.0
The PIC24HJ12GP201/202 devices have up to 10
ADC module input channels.
The AD12B bit (AD1CON1<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.
17.1
The 10-bit ADC configuration has the following key
features:
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 1.1 Msps
• Up to 10 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
• 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
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 PIC24HJ12GP201/202 devices. It is
not intended to be a comprehensive
reference source. To complement the
information in this data sheet, refer to the
“PIC24H
Please see the Microchip web site
(www.microchip.com)
PIC24H
chapters.
The ADC module must be disabled before
the AD12B bit can be modified.
Family
Family
Reference
Reference
for
the
Manual”.
Manual
latest
Preliminary
PIC24HJ12GP201/202
Depending on the particular device pinout, the ADC
can have up to 10 analog input pins, designated AN0
through AN9. 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. Refer to the device data sheet for
further details.
A block diagram of the ADC is shown in Figure 17-1.
17.2
To configure the ADC module:
1.
2.
3.
4.
5.
6.
7.
Select
(AD1PCFGH<15:0> or AD1PCFGL<15:0>).
Select voltage reference source to match
expected
(AD1CON2<15:13>).
Select the analog conversion clock to match
desired
(AD1CON3<5:0>).
Determine how many sample-and-hold chan-
nels will be used (AD1CON2<9:8> and
AD1PCFGH<15:0> or AD1PCFGL<15:0>).
Select
sequence
AD1CON3<12:8>).
Select the way conversion results are presented
in the buffer (AD1CON1<9:8>).
a)
Configure ADC interrupt (if required):
a)
b)
ADC Initialization
Turn on the ADC module (AD1CON1<15>).
Clear the AD1IF bit.
Select ADC interrupt priority.
the
port
data
range
appropriate
rate
pins
(AD1CON1<7:5>
with
on
as
sample/conversion
processor
analog
DS70282B-page 151
analog
inputs
inputs
clock
and