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© 2015-2019 Microchip Technology Inc. DS60001344E-page 22-1
Section 22. 12-bit High-Speed Successive Approximation
Register (SAR) Analog-to-Digital Converter (ADC)
This section of the manual contains the following major topics:
22.1 Introduction .................................................................................................................. 22-2
22.2 Control Registers ......................................................................................................... 22-6
22.3 ADC Operation........................................................................................................... 22-61
22.4 ADC Module Configuration ........................................................................................ 22-65
22.5 Additional ADC Functions .......................................................................................... 22-85
22.6 Interrupts.................................................................................................................. 22-108
22.7 Operation During Power-Saving Modes .................................................................. 22-114
22.8 Effects of Reset........................................................................................................ 22-116
22.9 Transfer Function..................................................................................................... 22-116
22.10 ADC Sampling Requirements.................................................................................. 22-117
22.11 Connection Considerations...................................................................................... 22-117
22.12 Related Application Notes........................................................................................ 22-118
22.13 Revision History ....................................................................................................... 22-119
PIC32 Family Reference Manual
DS60001344E-page 22-2 © 2015-2019 Microchip Technology Inc.
22.1 INTRODUCTION
The PIC32 12-bit High-Speed Successive Approximation Register (SAR) Analog-to-Digital
Converter (ADC) includes the following features:
• 12-bit resolution
• Up to eight ADC modules with dedicated Sample and Hold (S&H) circuits (see Note 1)
• Two dedicated ADC modules can be combined in Turbo mode to provide double
conversion rate
• Single-ended and/or differential inputs
• Can operate during Sleep mode
• Supports touch sense applications
• Up to six digital comparators
• Up to six digital filters supporting two modes:
- Oversampling mode
- Averaging mode
• FIFO and DMA engine for dedicated ADC modules (see Note 2)
• Early interrupt generation resulting in faster processing of converted data
• Designed for motor control, power conversion, and general purpose applications
The dedicated ADC modules use a single input (or its alternate) and is intended for high-speed
and precise sampling of time-sensitive or transient inputs, whereas the shared ADC module
incorporates a multiplexer on the input to facilitate a larger group of inputs, with slower sampling,
and provides flexible automated scanning option through the input scan logic.
For each ADC module, the analog inputs are connected to the S&H capacitor. The clock,
sampling time, and output data resolution for each ADC module can be set independently. The
ADC module performs the conversion of the input analog signal based on the configurations set
in the registers. When conversion is complete, the final result is stored in the result buffer for the
specific analog input and is passed to the digital filter and digital comparator if configured to use
data from this particular sample.
A simplified block diagram of the ADC module is illustrated in Figure 22-1.
Note: This family reference manual section is meant to serve as a complement to device
data sheets. Depending on the device, this manual section may not apply to all
PIC32 devices.
Please refer to the note at the beginning of the “ADC” chapter in the current device
data sheet to check whether this document supports the device you are using.
Device data sheets and family reference manual sections are available for
download from the Microchip Worldwide Web site at: http://www.microchip.com
Note 1: Depending on the device, the 12-bit High-Speed SAR ADC has up to seven
dedicated ADC modules and one shared ADC module. Throughout this chapter,
the diagrams and code examples refer to a device with seven dedicated ADC
modules (ADC0-ADC6) and one shared ADC (ADC7). Please consult the “ADC”
chapter in the specific device data sheet to determine which ADC modules are
available for your device.
2: This feature is not available on all devices. Refer to the “ADC” chapter in the
specific device data sheet to determine availability.
3: Prior to enabling the ADC module, the user application must copy the ADC
calibration data (DEVADCx) from the Configuration memory into the ADC
Configuration registers (ADC0CFG-ADC7CFG). Refer to the “ADC” chapter in the
specific device data sheet for more information.
© 2015-2019 Microchip Technology Inc. DS60001344E-page 22-3
Section 22. 12-bit High-Speed SAR ADC
Figure 22-1: ADC Block Diagram
Note: The number of ADC modules, analog inputs, ANa, ANb, ANc, and ANd, and the FIFO and DMA features
are shown as an example. Refer to the “ADC” chapter in the specific device data sheet to determine the
actual ANx selections, ADC module availability, and the specific FIFO and DMA features.
ADC0
ADC7
AV
DD
AV
SS
V
REF
+ V
REF
-
VREFSEL<2:0>
V
REFH
V
REFL
ADCSEL<1:0>
CONCLKDIV<5:0>
T
CY
FRC PBCLK
T
Q
ADCDIV<6:0>
(ADCxTIME<22:16>)
ADCDIV<6:0>
(ADCCON2<6:0>)
T
AD0
-T
AD6
T
AD7
ADDATA0
…...
ADDATA63
(Dedicated
ADC)
(Dedicated
ADC)
FIFO
DMA
Digital Filter
Digital Comparator Interrupt/Event
Capacitive Voltage
Divider (CVD) Interrupt/Event
Triggers,
Turbo Channel,
Scan Control Logic
Trigger
Status and Control
Registers
ADC6
SH0ALT<1:0>
(ADCTRGMODE<17:16>)
ANx
V
REFL
0
1
DIFFx<1>
(ADCIMCONx<x>)
ANa
AN1
V
REFL
0
1
DIFF1<1>
(ADCIMCON1<3>)
SH6ALT<1:0>
(ADCTRGMODE<29:28>)
ANx
V
REFL
0
1
DIFFx<1>
(ADCIMCONx<x>)
AN49
IV
CTMU
IV
BAT
AN48
AN7
CVD
Capacitor
T
CLK
ANb
ANc
ANd
00
01
10
11
ANb
ANc
ANd
00
01
10
11
SYSTEMBUS
ANa
Interrupt
Data

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC32MZ0512EFE064

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