Microchip PIC24HJ128GP202 Handleiding

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© 2007 Microchip Technology Inc. DS70225B-page 16-1
ADC
16
Section 16. Analog-to-Digital Converter (ADC)
HIGHLIGHTS
This section of the manual contains the following major topics:
16.1 Introduction .................................................................................................................. 16-2
16.2 Control Registers ......................................................................................................... 16-4
16.3 A/D Terminology and Conversion Sequence ............................................................. 16-14
16.4 ADC Module Configuration ........................................................................................ 16-16
16.5 Selecting the Voltage Reference Source ................................................................... 16-16
16.6 Selecting the A/D Conversion Clock .......................................................................... 16-17
16.7 Selecting Analog Inputs for Sampling ........................................................................ 16-18
16.8 Enabling the Module .................................................................................................. 16-20
16.9 Specifying Sample/Conversion Control...................................................................... 16-20
16.10 How to Start Sampling ............................................................................................... 16-21
16.11 How to Stop Sampling and Start Conversions ........................................................... 16-22
16.12 Controlling Sample/Conversion Operation................................................................. 16-32
16.13 Specifying Conversion Results Buffering ................................................................... 16-33
16.14 Conversion Sequence Examples............................................................................... 16-37
16.15 A/D Sampling Requirements...................................................................................... 16-55
16.16 Reading the ADC Result Buffer ................................................................................. 16-56
16.17 Transfer Function (10-bit Mode)................................................................................. 16-58
16.18 Transfer Function (12-bit Mode)................................................................................. 16-59
16.19 ADC Accuracy/Error................................................................................................... 16-60
16.20 Connection Considerations........................................................................................16-60
16.21 Code Examples.......................................................................................................... 16-60
16.22 Operation During Sleep and Idle Modes.................................................................... 16-67
16.23 Effects of a Reset....................................................................................................... 16-68
16.24 Special Function Registers Associated with the ADC................................................ 16-68
16.25 Design Tips ................................................................................................................ 16-70
16.26 Related Application Notes.......................................................................................... 16-71
16.27 Revision History ......................................................................................................... 16-72
© 2007 Microchip Technology Inc. DS70225B-page 16-2
Section 16. Analog-to-Digital Converter (ADC)
ADC
16
16.1 INTRODUCTION
The PIC24H family devices have up to 32 A/D input channels. These devices also have up to two
ADC modules (ADCx, where x = 1 or 2), each with its own set of Special Function Registers
(SFRs).
The 10-bit or 12-bit Operation Mode (AD12B) bit in the ADCx Control 1(ADxCON1) register
allows each of the ADC modules to be configured by the user application as either a 10-bit,
4 Sample/Hold (S/H) ADC (default configuration) or a 12-bit, 1 Sample/Hold ADC.
The 10-bit ADC configuration (AD12B = ) has the following key features:0
• Successive Approximation (SAR) conversion
• Conversion speeds of up to 1.1 Msps
• Up to 32 analog input pins
• External voltage reference input pins
• Simultaneous sampling of up to four analog input pins
• Automatic Channel Scan mode
• Selectable conversion trigger source
• Selectable Buffer Fill modes
• DMA support, including Peripheral Indirect Addressing
• Four result alignment options (signed/unsigned, fractional/integer)
• Operation during CPU Sleep and Idle modes
Depending on the particular device pinout, the ADC can have up to 32 analog input pins,
designated AN0 through AN31. 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. For further details, refer to the device data sheet.
The analog inputs are multiplexed to four Sample/Hold amplifiers, designated CH0-CH3. One,
two, or four of the Sample/Hold amplifiers can be enabled for acquiring input data. The analog
input multiplexers can be switched between two sets of analog inputs during conversions.
Unipolar differential conversions are possible on all channels using certain input pins (refer to
Figure 16-1).
An Analog Input Scan mode can be enabled for the CH0 Sample/Hold Amplifier. A Control
register specifies which analog input channels are included in the scanning sequence.
The ADC is connected to a single-word result buffer; however, multiple conversion results can
be stored in a DMA RAM buffer with no CPU overhead. Each conversion result is converted to
one of four 16-bit output formats when it is read from the buffer.
The 12-bit ADC configuration (AD12B = 1) supports all the features described, except:
• In the 12-bit configuration, conversion speeds of up to 500 ksps are supported
• There is only one Sample/Hold amplifier in the 12-bit configuration, so simultaneous
sampling of multiple channels is not supported
Note: The ADC module needs to be disabled before the AD12B bit is modified.
PIC24H Family Reference Manual
DS70225B-page 16-3 © 2007 Microchip Technology Inc.
Figure 16-1: ADC Block Diagram
S/H
+
-
Conversion Conversion Logic
VREF+( )1
AVSS
AVDD
ADC
Data Format
16-bit
ADC Result
Bus Interface
00000
00101
00111
01001
11110
11111
00001
00010
00011
00100
00110
01000
01010
01011
AN30
AN31
AN8
AN9
AN10
AN11
AN2
AN4
AN7
AN0
AN3
AN1
AN5
CH1( )2
CH2( )2
CH3( )2
CH0
AN5
AN2
AN11
AN8
V -REF
AN4
AN1
AN10
AN7
V -REF
AN3
AN0
AN9
AN6
V -REF
AN1
VREF-
VREF-( )1
Sample/Sequence
Control
Sample
CH0,CH1,
CH2,CH3
Input MUX
Control
Input
Switches
S/H
+
-
S/H
+
-
S/H
+
-
AN6
Buffer
Result
Note 1: VREF+, VREF- inputs can be multiplexed with other analog inputs. For details, refer to device data
sheet.
2: Channels 1, 2 and 3 are not applicable for the 12-bit mode of operation.
3: The ADC1 module can use all 32 analog input pins (AN0-AN31), whereas ADC2 can use only 16.
Analog Input Pins( )3

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC24HJ128GP202

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