參數(shù)資料
型號: PIC16F676-I/ML
廠商: Microchip Technology
文件頁數(shù): 70/132頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 1KX14 16QFN
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 91
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 12
程序存儲器容量: 1.75KB(1K x 14)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-VQFN 裸露焊盤
包裝: 管件
產(chǎn)品目錄頁面: 638 (CN2011-ZH PDF)
配用: AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
PIC16F630/676
DS40039F-page 42
2010 Microchip Technology Inc.
6.3
Analog Input Connection
Considerations
A simplified circuit for an analog input is shown in
Figure 6-3. Since the analog pins are connected to a
digital output, they have reverse biased diodes to VDD
and VSS. The analog input, therefore, must be between
VSS and VDD. If the input voltage deviates from this
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up may occur. A
maximum
source
impedance
of
10 k
is
recommended for the analog sources. Any external
component connected to an analog input pin, such as
a capacitor or a Zener diode, should have very little
leakage current.
FIGURE 6-3:
ANALOG INPUT MODE
6.4
Comparator Output
The comparator output, COUT, is read through the
CMCON register. This bit is read-only. The comparator
output may also be directly output to the RA2 pin in
three of the eight possible modes, as shown in
Figure 6-2. When in one of these modes, the output on
RA2 is asynchronous to the internal clock. Figure 6-4
shows the comparator output block diagram.
The TRISA<2> bit functions as an output enable/
disable for the RA2 pin while the comparator is in an
Output mode.
FIGURE 6-4:
MODIFIED COMPARATOR OUTPUT BLOCK DIAGRAM
VA
Rs < 10K
AIN
CPIN
5 pF
VDD
VT = 0.6V
RIC
Leakage
±500 nA
Vss
Legend:
CPIN
= Input Capacitance
VT
= Threshold Voltage
ILEAKAGE
= Leakage Current at the pin due to Various Junctions
RIC
= Interconnect Resistance
RS
= Source Impedance
VA
= Analog Voltage
Note 1: When reading the PORTA register, all
pins configured as analog inputs will read
as a ‘0’. Pins configured as digital inputs
will convert an analog input according to
the TTL input specification.
2: Analog levels on any pin that is defined as
a digital input, may cause the input buffer
to consume more current than is
specified.
To RA2/T0CKI pin
RD CMCON
Set CMIF bit
Reset
To Data Bus
CINV
CVREF
D
EN
Q
D
EN
Q
RD CMCON
RA1/CIN-
RA0/CIN+
CM2:CM0
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