PIC18F87K90-E/PT Microchip Technology, PIC18F87K90-E/PT Datasheet - Page 392

• Manufacturer Part Number: PIC18F87K90-E/PT
• Description: 128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TR
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F87K90-E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87K90 FAMILY
24.2
A single comparator is shown in
the relationship between the analog input levels and
the digital output. When the analog input at V
than the analog input, V
tor is a digital low level. When the analog input at V
is greater than the analog input, V
comparator is a digital high level. The shaded areas of
the output of the comparator, in
the uncertainty due to input offsets and response time.
FIGURE 24-2:
FIGURE 24-3:
DS39957D-page 392
V
V
Output
IN
IN
-
+
V
V
IN
IN
Comparator Operation
-
+
VA
<10k 
R
Legend:
S
+
–
SINGLE COMPARATOR
COMPARATOR ANALOG INPUT MODEL
IN
-, the output of the compara-
A
IN
Figure
Figure
C
V
I
R
R
VA
LEAKAGE
C
5 pF
PIN
T
IC
S
IN
PIN
-, the output of the
24-2, along with
24-2, represent
Output
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
IN
+ is less
IN
V
+
DD
V
V
T
T
= 0.6V
= 0.6V
24.3
Response time is the minimum time, after selecting a
new reference voltage or input source, before the com-
parator output has a valid level. The response time of
the comparator differs from the settling time of the
voltage reference. Therefore, both of these times must
be considered when determining the total response to
a comparator input change. Otherwise, the maximum
delay of the comparators should be used (see
Section 31.0 “Electrical Characteristics”
24.4
A simplified circuit for an analog input is shown in
Figure
digital output, they have reverse biased diodes to V
and V
V
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up condition may
occur.
A
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.
SS
maximum
and V
SS
24-3. Since the analog pins are connected to a
. The analog input, therefore, must be between
Comparator
Analog Input Connection
Considerations
I
±100 nA
V
LEAKAGE
DD
SS
. If the input voltage deviates from this
source
 2009-2011 Microchip Technology Inc.
R
IC
Response Time
impedance
Comparator
Input
of
).
10 k 
DD
is