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PIC18F86J72/87J72
2.4.1
CONSIDERATIONS FOR CERAMIC
In addition to temperature tolerance, the effective
CAPACITORS
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
capacitors very attractive in many types of applications.
Ceramic capacitors are suitable for use with the
internal voltage regulator of this microcontroller. How-
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
16V, 10V and 6.3V rated capacitors is shown in
ever, some care is needed in selecting the capacitor 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-
FIGURE 2-4
10
DC BIAS VOLTAGE vs.
CAPACITANCE
CHARACTERISTICS
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
0
-10
-20
-30
-40
-50
-60
-70
-80
6.3V Capacitor
16V Capacitor
10V Capacitor
in-circuit tolerance is, therefore, much wider than the
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
initial tolerance specification.
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 DDCORE voltage regulator stability and
transient response requirements. Therefore, Y5V
capacitors are not recommended for use with the
internal voltage regulator if the application must
operate over a wide temperature range.
DS80508C-page 6
DC Bias Voltage (VDC)
When selecting a ceramic capacitor to be used with the
internal voltage regulator, it is suggested to select a
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 core voltage. Suggested capacitors
? 2011 Microchip Technology Inc.
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