PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology

零件编号

产品描述 (功能)

生产厂家

PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

The analog reference voltage is software selectable to

either the device’s positive and negative supply voltage

(VDD and VSS), or the voltage level on the RA3/AN3/

VREF+ and RA2/AN2/VREF-/CVREF pins.

The A/D converter has a unique feature of being able

to operate while the device is in Sleep mode. To oper-

ate in Sleep, the A/D conversion clock must be derived

from the A/D’s internal RC oscillator.

The output of the sample and hold is the input into the

converter, which generates the result via successive

approximation.

A device Reset forces all registers to their Reset state.

This forces the A/D module to be turned off and any

conversion in progress is aborted.

Each port pin associated with the A/D converter can be

configured as an analog input, or as a digital I/O. The

ADRESH and ADRESL registers contain the result of

the A/D conversion. When the A/D conversion is com-

plete, the result is loaded into the ADRESH:ADRESL

register pair, the GO/DONE bit (ADCON0 register) is

cleared and A/D Interrupt Flag bit, ADIF, is set. The block

diagram of the A/D module is shown in Figure 19-1.

FIGURE 19-1:

A/D BLOCK DIAGRAM

CHS3:CHS0

1100

1011

1010

1001

1000

0111

0110

0101

10-Bit

Converter

A/D

VAIN

(Input Voltage)

0100

0011

0010

Reference

Voltage

VCFG1:VCFG0

VREF+

VREF-

VDD

X0

X1

1X

0X

VSS

0001

0000

AN12

AN11

AN10

AN9

AN8

AN7(1)

AN6(1)

AN5(1)

AN4

AN3

AN2

AN1

AN0

Note 1: Channels AN5 through AN7 are not available on 28-pin devices.

2: I/O pins have diode protection to VDD and VSS.

DS39631A-page 226

Preliminary

 2004 Microchip Technology Inc.

Share Link: