PIC18F4220-I/PT Microchip Technology, PIC18F4220-I/PT Datasheet - Page 230

• Manufacturer Part Number: PIC18F4220-I/PT
• Description: IC MCU FLASH 2KX16 A/D 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4220-I/PT

• Core Size: 8-Bit
• Program Memory Size: 4KB (2K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Core: PIC
• Processor Series: PIC18F
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Data Ram Size: 512 B
• Data Rom Size: 256 B
• On-chip Adc: Yes
• Number Of Programmable I/os: 36
• Number Of Timers: 2 x 8 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 13
• Height: 1 mm
• Interface Type: SPI, I2C, USART
• Length: 10 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.2 V
• Width: 10 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / Rohs Status: Details

PIC18F2220/2320/4220/4320
FIGURE 21-1:
21.2
The full range of voltage reference cannot be realized
due to the construction of the module. The transistors
on the top and bottom of the resistor ladder network
(Figure 21-1) keep CV
ence source rails. The voltage reference is derived
from V
fluctuations in V
the voltage reference can be found in Section 26.0
“Electrical Characteristics”.
21.3
The contents of the CVRCON register are not affected
by entry to or exit from power-managed modes. To min-
imize current consumption in power-managed modes,
the voltage reference module should be disabled; how-
ever, this can cause an interrupt from the comparators
so the comparator interrupt should also be disabled
while the CVRCON register is being modified.
DS39599G-page 228
CVREN
DD
Voltage Reference Accuracy/Error
Operation in Power-Managed
Modes
RA2/AN2/V
; therefore, the CV
DD
CV
. The tested absolute accuracy of
REF
REF
REF
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
-/CV
V
DD
from approaching the refer-
REF
CVROE
REF
8R
output changes with
R
R
16 Stages
16-1 Analog Mux
21.4
A device Reset disables the voltage reference by clear-
ing the CVRCON register. This also disconnects the
reference from the RA2 pin, selects the high-voltage
range and selects the lowest voltage tap from the
resistor divider.
21.5
The voltage reference module operates independently
of the comparator module. The output of the reference
generator may be output using the RA2 pin if the
CVROE bit is set. Enabling the voltage reference out-
put onto the RA2 pin, with an input signal present, will
increase current consumption.
The RA2 pin can be used as a simple D/A output with
limited drive capability. Due to the limited current drive
capability, an external buffer must be used on the
voltage reference output for external connections to
V
technique.
REF
. Figure 21-2 shows an example buffering
R
Effects of a Reset
Connection Considerations
R
© 2007 Microchip Technology Inc.
8R
CVR3
CVR0
(From CVRCON<3:0>)
CVRR