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| PIC16F1938_13 Datasheet, PDF (149/488 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver | |||
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PIC16(L)F1938/9
15.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
The Analog-to-Digital Converter (ADC) allows
conversion of an analog input signal to a 10-bit binary
representation of that signal. This device uses analog
inputs, which are multiplexed into a single sample and
hold circuit. The output of the sample and hold is
connected to the input of the converter. The converter
generates a 10-bit binary result via successive
approximation and stores the conversion result into the
ADC result registers (ADRESH:ADRESL register pair).
Figure 15-1 shows the block diagram of the ADC.
The ADC voltage reference is software selectable to be
either internally generated or externally supplied.
FIGURE 15-1:
ADC BLOCK DIAGRAM
The ADC can generate an interrupt upon completion of
a conversion. This interrupt can be used to wake-up the
device from Sleep.
VREF-
ADNREF = 1
ADNREF = 0
VDD VSS
ADPREF = 00
ADPREF = 11
VREF+ ADPREF = 10
AN0
AN1
VREF-/AN2
VREF+/AN3
AN4
AN5(2)
AN6(2)
AN7(2)
AN8
AN9
AN10
AN11
AN12
AN13
Temperature Indicator
DAC_output
FVR Buffer1
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
11101
11110
11111
GO/DONE
Ref+ Ref-
ADC
ADON(1)
VSS
10
ADFM
0 = Left Justify
1 = Right Justify
16
ADRESH ADRESL
CHS<4:0>
Note 1: When ADON = 0, all multiplexer inputs are disconnected.
2: Not available on PIC16(L)F1938.
ï£ 2011-2013 Microchip Technology Inc.
DS40001574C-page 149
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