PIC18F1330-I/SO Microchip Technology, PIC18F1330-I/SO Datasheet - Page 183

• Manufacturer Part Number: PIC18F1330-I/SO
• Description: IC PIC MCU FLASH 4KX16 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F1330-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 8KB (4K x 16)
• Package / Case: 18-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 128 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: EUSART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Operating Supply Voltage: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 4-ch x 10-bit
• Package: 18SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

18.0
The comparator voltage reference is a 16-tap resistor
ladder network that provides a selectable reference
voltage. Its purpose is to provide a reference for the
analog comparators.
A block diagram of the module is shown in Figure 18-1.
The resistor ladder is segmented to provide two ranges
of CV
conserve power when the reference is not being used.
The module’s supply reference can be provided from
either device V
18.1
The voltage reference module is controlled through the
CVRCON register (Register 18-1). The comparator
voltage reference provides two ranges of output
voltage, each with 16 distinct levels. The range to be
used is selected by the CVRR bit (CVRCON<5>). The
primary difference between the ranges is the size of the
steps
(CVR3:CVR0), with one range offering finer resolution.
The equations used to calculate the output of the
comparator voltage reference are as follows:
 2009 Microchip Technology Inc.
If CVRR = 1:
CV
If CVRR = 0:
CV
CV
REF
REF
REF
RSRC
selected
COMPARATOR VOLTAGE
REFERENCE MODULE
Configuring the Comparator
Voltage Reference
values and has a power-down function to
= (CV
= ((CVR3:CVR0)/24) x CV
)
DD
/V
RSRC
by
SS
or an external voltage reference.
x 1/4) + (((CVR3:CVR0)/32) x
the
CV
REF
RSRC
selection
bits
The comparator reference supply voltage can come
from either AV
multiplexed with RA4 and AV
selected by the CVRSS bit (CVRCON<4>).
Additionally, the voltage reference can select the
unscaled V
bypassing the CV
Figure 18-1.)
The settling time of the comparator voltage reference
must be considered when changing the CV
Characteristics”).
TABLE 18-1:
output (see Table 23-3 in Section 23.0 “Electrical
CVREN CVRSS
0
0
1
1
PIC18F1230/1330
REF
0
1
0
1
DD
+ input for use by the comparators,
or AV
VOLTAGE REFERENCE
OUTPUT
REF
Disabled
Disabled
Enabled
Enabled
C
VREF
SS
module. (See Table 18-1 and
, or the external V
SS
No reference
From V
(CV
From CV
From CV
. The voltage source is
REF
Comparator Input
DS39758D-page 183
REF
bypassed)
REF
REF
REF
+ that is
REF