PIC24HJ128GP202 데이터 시트보기 (PDF) - Microchip Technology
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PIC24HJ128GP202 Datasheet PDF : 357 Pages
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PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04
FIGURE 2-1:
RECOMMENDED
MINIMUM CONNECTION
VDD
R
R1
MCLR
C
VSS
VDD
0.1 µF
Ceramic
10 Ω
PIC24H
0.1 µF
Ceramic
0.1 µF
Ceramic
VDD
VSS
0.1 µF
Ceramic
0.1 µF
Ceramic
2.2.1 TANK CAPACITORS
On boards with power traces running longer than six
inches in length, it is suggested to use a tank capacitor
for integrated circuits including MCUs 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 µF to 47 µF.
2.3 Capacitor on Internal Voltage
Regulator (VCAP/VDDCORE)
A low-ESR (< 5 Ohms) capacitor is required on the
VCAP/VDDCORE pin, which is used to stabilize the
voltage regulator output voltage. The VCAP/VDDCORE
pin must not be connected to VDD, and must have a
capacitor between 4.7 µF and 10 µF, 16V connected to
ground. The type can be ceramic or tantalum. Refer to
Section 28.0 “Electrical Characteristics” for
additional information.
The placement of this capacitor should be close to the
VCAP/VDDCORE. It is recommended that the trace
length not exceed one-quarter inch (6 mm). Refer to
Section 25.2 “On-Chip Voltage Regulator” for
details.
2.4 Master Clear (MCLR) Pin
The MCLR pin provides for two specific device
functions:
• Device Reset
• Device programming and debugging
During device 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 (VIH and VIL) and fast signal
transitions must not be adversely affected. Therefore,
specific values of R and C will need to be adjusted
based on the application and PCB requirements.
For example, as shown in Figure 2-2, it is
recommended that the capacitor C, be isolated from
the MCLR pin during programming and debugging
operations.
Place the components shown in Figure 2-2 within
one-quarter inch (6 mm) from the MCLR pin.
FIGURE 2-2:
EXAMPLE OF MCLR PIN
CONNECTIONS
VDD
R
R1
MCLR
JP
PIC24H
C
Note 1: R ≤ 10 kΩ is recommended. A suggested
starting value is 10 kΩ. Ensure that the
MCLR pin VIH and VIL specifications are met.
2: R1 ≤ 470Ω 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
VIH and VIL specifications are met.
DS70293D-page 16
Preliminary
© 2009 Microchip Technology Inc.
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