PIC18F4550-I/PT Microchip Technology Inc., PIC18F4550-I/PT Datasheet - Page 275

• Manufacturer Part Number: PIC18F4550-I/PT
• Description: 44 PIN, 32 KB FLASH, 2048 RAM, FS-USB 2.0
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4550-I/PT

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 12 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 34
• Interface: I2C/SPI/UART/USART/USB
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Speed: 48 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

22.9
A simplified circuit for an analog input is shown in
Figure 22-4. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
V
FIGURE 22-4:
TABLE 22-1:
© 2006 Microchip Technology Inc.
CMCON
CVRCON
INTCON
PIR2
PIE2
IPR2
PORTA
LATA
TRISA
Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the comparator module.
Note 1:
SS
Name
and V
SS
. The analog input, therefore, must be between
Analog Input Connection
Considerations
DD
PORTA<6> and its direction and latch bits are individually configured as port pins based on various
oscillator modes. When disabled, these bits read as ‘0’.
. If the input voltage deviates from this
VA
GIE/GIEH PEIE/GIEL TMR0IE
OSCFIF
OSCFIE
OSCFIP
CVREN
C2OUT
Bit 7
REGISTERS ASSOCIATED WITH COMPARATOR MODULE
—
—
—
R
S
Legend:
< 10k
COMPARATOR ANALOG INPUT MODEL
TRISA6
A
LATA6
CVROE
C1OUT
IN
RA6
CMIF
CMIE
CMIP
Bit 6
C
V
I
R
R
VA
LEAKAGE
C
5 pF
(1)
T
PIN
IC
S
(1)
PIN
(1)
TRISA5
C2INV
USBIF
USBIE
USBIP
CVRR
LATA5
Bit 5
RA5
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
PIC18F2455/2550/4455/4550
Preliminary
DD
V
CVRSS
TRISA4
INT0IE
C1INV
LATA4
EEIF
EEIE
EEIP
DD
Bit 4
RA4
V
V
T
T
= 0.6V
= 0.6V
TRISA3
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up condition may
occur. A maximum source impedance of 10 k
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.
BCLIF
BCLIE
BCLIP
LATA3
CVR3
RBIE
Bit 3
RA3
CIS
I
±500 nA
V
LEAKAGE
TMR0IF
HLVDIE
HLVDIP
SS
HLVDIF
TRISA2
LATA2
CVR2
Bit 2
CM2
RA2
R
IC
TMR3IF
TMR3IE
TMR3IP
TRISA1
INT0IF
LATA1
CVR1
Bit 1
CM1
RA1
CCP2IF
CCP2IE
CCP2IP
TRISA0
Comparator
Input
LATA0
CVR0
DS39632C-page 273
RBIF
Bit 0
CM0
RA0
on page
Values
Reset
53
53
51
54
54
54
54
54
54
is