PIC18F4220-I/P Microchip Technology Inc., PIC18F4220-I/P Datasheet - Page 225
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PIC18F4220-I/P
Manufacturer Part Number
PIC18F4220-I/P
Description
Microcontroller; 4 KB Flash; 512 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4220-IP.pdf
(388 pages)
Specifications of PIC18F4220-I/P
A/d Inputs
13-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
4K Bytes
Ram Size
512 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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20.2
A single comparator is shown in Figure 20-2, along with
the relationship between the analog input levels and
the digital output. When the analog input at V
than the analog input V
is a digital low level. When the analog input at V
greater than the analog input V
comparator is a digital high level. The shaded areas of
the output of the comparator in Figure 20-2 represent
the uncertainty due to input offsets and response time.
20.3
An external or internal reference signal may be used
depending on the comparator operating mode. The
analog signal present at V
at V
adjusted accordingly (Figure 20-2).
FIGURE 20-2:
20.3.1
When external voltage references are used, the
comparator module can be configured to have the com-
parators operate from the same or different reference
sources. However, threshold detector applications may
require the same reference. The reference signal must
be between V
pin of the comparator(s).
2003 Microchip Technology Inc.
Output
V
V
Output
IN
IN
V
V
IN
IN–
IN+
-
+
+ and the digital output of the comparator is
V
V
IN
IN
Comparator Operation
Comparator Reference
+
-
EXTERNAL REFERENCE SIGNAL
SS
and V
+
–
SINGLE COMPARATOR
IN
DD
-, the output of the comparator
IN
and can be applied to either
- is compared to the signal
IN
-, the output of the
Output
IN
PIC18F2220/2320/4220/4320
+ is less
IN
+ is
20.3.2
The comparator module also allows the selection of an
internally generated voltage reference for the compara-
tors. Section 21.0 “Comparator Voltage Reference
Module” contains a detailed description of the compar-
ator voltage reference module that provides this signal.
The internal reference signal is used when comparators
are in mode, CM2:CM0 = 110 (Figure 20-1). In this
mode, the internal voltage reference is applied to the
V
Depending on the setting of the CVROE bit
(CVRCON<6>), the voltage reference may also be
available on pin RA2.
20.4
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output has a valid level. If the internal ref-
erence is changed, the maximum delay of the internal
voltage reference must be considered when using the
comparator outputs. Otherwise, the maximum delay of
the comparators should be used (see Table 26-2 in
Section 26.0 “Electrical Characteristics”).
20.5
The comparator outputs are read through the CMCON
register. These bits are read-only. The comparator
outputs may also be directly output to the RA4 and RA5
I/O pins. When enabled, multiplexers in the output path
of the RA4 and RA5 pins will switch and the output of
each pin will be the unsynchronized output of the com-
parator. The uncertainty of each of the comparators is
related to the input offset voltage and the response time
given in the specifications. Figure 20-3 shows the
comparator output block diagram.
The TRISA bits will still function as an output enable/
disable for the RA4 and RA5 pins while in this mode.
The polarity of the comparator outputs can be changed
using the C2INV and C1INV bits (CMCON<4:5>).
IN
Note 1: When reading the Port register, all pins
+ pin of both comparators.
2: Analog levels on any pin defined as a
Comparator Response Time
Comparator Outputs
INTERNAL REFERENCE SIGNAL
configured as analog inputs will read as a
‘0’. Pins configured as digital inputs will
convert an analog input according to the
Schmitt Trigger input specification.
digital input may cause the input buffer to
consume more current than is specified.
DS39599C-page 223
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