PIC18F2320-I/SO Microchip Technology Inc., PIC18F2320-I/SO Datasheet - Page 230

• Manufacturer Part Number: PIC18F2320-I/SO
• Description: Microcontroller; 8 KB Flash; 512 RAM; 256 EEPROM; 25 I/O; 28-Pin-SOIC
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F2320-I/SO

• A/d Inputs: 10-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SOIC
• Programmable Memory: 8K Bytes
• Ram Size: 512 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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.
DS39599C-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
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
 2003 Microchip Technology Inc.
8R
CVR3
CVR0
(From CVRCON<3:0>)
CVRR