PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 34

• Manufacturer Part Number: PIC18F24J11
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

capacitors very attractive in many types of applications.
initial tolerance specification.
PIC18F46J11 FAMILY
2.4.1
In recent years, large value, low-voltage, surface-mount
ceramic capacitors have become very cost effective in
sizes up to a few tens of microfarad. The low-ESR, small
physical size and other properties make ceramic
Ceramic capacitors are suitable for use with the
V
However, some care is needed in selecting the capac-
itor to ensure that it maintains sufficient capacitance
over the intended operating range of the application.
Typical low-cost, 10 µF ceramic capacitors are available
in X5R, X7R and Y5V dielectric ratings (other types are
also available, but are less common). The initial toler-
ance specifications for these types of capacitors are
often specified as ±10% to ±20% (X5R and X7R), or -
20%/+80% (Y5V). However, the effective capacitance
that these capacitors provide in an application circuit will
also vary based on additional factors, such as the
applied DC bias voltage and the temperature. The total
in-circuit tolerance is, therefore, much wider than the
The X5R and X7R capacitors typically exhibit satisfac-
tory temperature stability (ex: ±15% over a wide
temperature range, but consult the manufacturer's data
sheets for exact specifications). However, Y5V capaci-
tors typically have extreme temperature tolerance
specifications of +22%/-82%. Due to the extreme
temperature tolerance, a 10 µF nominal rated Y5V type
capacitor may not deliver enough total capacitance to
meet minimum V
transient response requirements. Therefore, Y5V
capacitors are not recommended for use with the
V
a wide temperature range.
In addition to temperature tolerance, the effective
capacitance of large value ceramic capacitors can vary
substantially, based on the amount of DC voltage
applied to the capacitor. This effect can be very signifi-
cant, but is often overlooked or is not always
documented.
A typical DC bias voltage vs. capacitance graph for
X7R type and Y5V type capacitors is shown in
Figure
DS39932D-page 34
DDCORE
DDCORE
2-4.
regulator if the application must operate over
voltage regulator of this microcontroller.
CONSIDERATIONS FOR CERAMIC
CAPACITORS
DDCORE
voltage regulator stability and
FIGURE 2-4:
When selecting a ceramic capacitor to be used with the
V
high-voltage rating, so that the operating voltage is a
small percentage of the maximum rated capacitor volt-
age. For example, choose a ceramic capacitor rated at
16V for the 2.5V V
capacitors are shown in
2.5
The PGC and PGD pins are used for In-Circuit Serial
Programming™ (ICSP™) and debugging purposes. It
is recommended to keep the trace length between the
ICSP connector and the ICSP pins on the device as
short as possible. If the ICSP connector is expected to
experience an ESD event, a series resistor is recom-
mended, with the value in the range of a few tens of
ohms, not to exceed 100Ω.
Pull-up resistors, series diodes, and capacitors on the
PGC and PGD pins are not recommended as they will
interfere with the programmer/debugger communica-
tions to the device. If such discrete components are an
application requirement, they should be removed from
the circuit during programming and debugging. Alter-
natively, refer to the AC/DC characteristics and timing
requirements information in the respective device
Flash programming specification for information on
capacitive loading limits, and pin input voltage high
(V
For device emulation, ensure that the “Communication
Channel Select” (i.e., PGCx/PGDx pins), programmed
into the device, matches the physical connections for
the ICSP to the Microchip debugger/emulator tool.
For
development tools connection requirements, refer to
Section 28.0 “Development
DDCORE
IH
-10
-20
-30
-40
-50
-60
-70
-80
10
) and input low (V
0
0
more
6.3V Capacitor
1
ICSP Pins
voltage regulator, it is suggested to select a
2
3
information
4
DC Bias Voltage (VDC)
5
IL
6
10V Capacitor
DC BIAS VOLTAGE vs.
CAPACITANCE
CHARACTERISTICS
) requirements.
DDCORE
 2011 Microchip Technology Inc.
Table
7
8
on
Support”.
9
2-1.
10
16V Capacitor
available
voltage. Suggested
11
12
13
14
Microchip
15
16
17