Datasheet

2011-2013 Microchip Technology Inc. DS30001037C-page 157
PIC24F16KL402 FAMILY
19.0 10-BIT HIGH-SPEED A/D
CONVERTER
The 10-bit A/D Converter has the following key
features:
Successive Approximation (SAR) conversion
Conversion speeds of up to 500 ksps
Up to 12 analog input pins
External voltage reference input pins
Internal band gap reference input
Automatic Channel Scan mode
Selectable conversion trigger source
Two-word conversion result buffer
Selectable Buffer Fill modes
Four result alignment options
Operation during CPU Sleep and Idle modes
Depending on the particular device, PIC24F16KL402
family devices implement up to 12 analog input pins,
designated AN0 through AN4 and AN9 through AN15.
In addition, there are two analog input pins for external
voltage reference connections (V
REF+ and VREF-).
These voltage reference inputs may be shared with
other analog input pins.
A block diagram of the A/D Converter is displayed in
Figure 19-1.
To perform an A/D conversion:
1. Configure the A/D module:
a) Configure port pins as analog inputs and/
or select band gap reference inputs
(ANSA<3:0>, ANSB<15:12,4:0> and
ANCFG<0>).
b) Select the voltage reference source to
match the expected range on analog inputs
(AD1CON2<15:13>).
c) Select the analog conversion clock to match
the desired data rate with the processor
clock (AD1CON3<7:0>).
d) Select the appropriate sample/conversion
sequence (AD1CON1<7:5> and
AD1CON3<12:8>).
e) Select how conversion results are
presented in the buffer (AD1CON1<9:8>).
f) Select interrupt rate (AD1CON2<5:2>).
g) Turn on A/D module (AD1CON1<15>).
2. Configure A/D interrupt (if required):
a) Clear the AD1IF bit.
b) Select A/D interrupt priority.
Note: This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the 10-Bit
High-Speed A/D Converter, refer to the
“dsPIC33/PIC24 Family Reference
Manual, “10-Bit A/D Converter”
(DS39705).