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| 型号： | DM240013-1 |
| 厂商： | Microchip Technology |
| 文件页数： | 18/278页 |
| 文件大小： | 0K |
| 描述： | KIT DEV MICROSTICK PIC24F KA/KL |
| 标准包装： | 1 |
| 系列： | MPLAB® |
| 类型： | MCU |
| 适用于相关产品： | PIC24F K 系列 |
| 所含物品： | 板，电缆，连接器，样品 |
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PIC24F16KA102 FAMILY
2.2
Power Supply Pins
2.3
Master Clear (MCLR) Pin
2.2.1 DECOUPLING CAPACITORS
The use of decoupling capacitors on every pair of
power supply pins, such as V DD , V SS , AV DD and
AV SS , is required.
Consider the following criteria when using decoupling
capacitors:
? Value and type of capacitor: A 0.1 ? F (100 nF),
10-20V capacitor is recommended. The capacitor
should be a low-ESR device, with a resonance
frequency in the range of 200 MHz and higher.
Ceramic capacitors are recommended.
? Placement on the printed circuit board: The
decoupling capacitors should be placed as close
to the pins as possible. It is recommended to
place the capacitors on the same side of the
board as the device. If space is constricted, the
capacitor can be placed on another layer on the
PCB using a via; however, ensure that the trace
length from the pin to the capacitor is no greater
than 0.25 inch (6 mm).
? Handling high-frequency noise: If the board is
experiencing high-frequency noise (upward of
tens of MHz), add a second ceramic type capaci-
tor in parallel to the above described decoupling
capacitor. The value of the second capacitor can
be in the range of 0.01 ? F to 0.001 ? F. Place this
The MCLR pin provides two specific device
functions: Device Reset, and Device Programming
and Debugging. If programming and debugging are
not required in the end application, a direct
connection to V DD may be all that is required. The
addition of other components, to help increase the
application’s resistance to spurious Resets from
voltage sags, may be beneficial. A typical
configuration is shown in Figure 2-1 . Other circuit
designs may be implemented, depending on the
application’s requirements.
During programming and debugging, the resistance
and capacitance that can be added to the pin must
be considered. Device programmers and debuggers
drive the MCLR pin. Consequently, specific voltage
levels (V IH and V IL ) and fast signal transitions must
not be adversely affected. Therefore, specific values
of R1 and C1 will need to be adjusted based on the
application and PCB requirements. For example, it is
recommended that the capacitor, C1, be isolated
from the MCLR pin during programming and
debugging operations by using a jumper ( Figure 2-2 ).
The jumper is replaced for normal run-time
operations.
Any components associated with the MCLR pin
should be placed within 0.25 inch (6 mm) of the pin.
second capacitor next to each primary decoupling
FIGURE 2-2:
EXAMPLE OF MCLR PIN
capacitor. In high-speed circuit designs, consider
implementing a decade pair of capacitances as
close to the power and ground pins as possible
(e.g., 0.1 ? F in parallel with 0.001 ? F).
? Maximizing performance: On the board layout
V DD
R1
CONNECTIONS
from the power supply circuit, run the power and
return traces to the decoupling capacitors first,
and then to the device pins. This ensures that the
decoupling capacitors are first in the power chain.
Equally important is to keep the trace length
between the capacitor and the power pins to a
minimum, thereby reducing PCB trace
inductance.
JP
C1
R2
MCLR
PIC24FXXKXX
2.2.2
TANK CAPACITORS
Note 1:
R1 ?? 10 k ? is recommended. A suggested
starting value is 10 k ? . Ensure that the
On boards with power traces running longer than
six inches in length, it is suggested to use a tank capac-
itor for integrated circuits, including microcontrollers, to
supply a local power source. The value of the tank
capacitor should be determined based on the trace
resistance that connects the power supply source to
the device, and the maximum current drawn by the
device in the application. In other words, select the tank
capacitor so that it meets the acceptable voltage sag at
the device. Typical values range from 4.7 ? F to 47 ? F.
DS39927C-page 18
2:
MCLR pin V IH and V IL specifications are met.
R2 ?? 470 ? will limit any current flowing into
MCLR from the external capacitor, C, in the
event of MCLR pin breakdown, due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS). Ensure that the MCLR pin
V IH and V IL specifications are met.
? 2008-2011 Microchip Technology Inc.
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