
PIC24HJ32GP202/204 AND PIC24HJ16GP304
DS70289J-page 14
2007-2011 Microchip Technology Inc.
FIGURE 2-1:
RECOMMENDED
MINIMUM CONNECTION
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 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 microcontroller, and the maximum current drawn by
the microcontroller 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.
2.3
CPU Logic Filter Capacitor
Connection (VCAP)
A low-ESR (< 5 Ohms) capacitor is required on the
VCAP pin, which is used to stabilize the voltage
regulator output voltage. The VCAP pin must not be
connected to VDD, and must have a capacitor between
4.7 F and 10 F, 16V connected to ground. The type
for
additional
information.
The placement of this capacitor should be close to the
VCAP. It is recommended that the trace length not
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.
recommended that capacitor C is isolated from the
MCLR pin during programming and debugging
operations.
one-quarter inch (6 mm) from the MCLR pin.
FIGURE 2-2:
EXAMPLE OF MCLR PIN
CONNECTIONS
PIC24H
V
DD
V
SS
VDD
VSS
VDD
AV
DD
AV
SS
V
DD
V
SS
0.1 F
Ceramic
0.1 F
Ceramic
0.1 F
Ceramic
0.1 F
Ceramic
C
R
VDD
MCLR
0.1 F
Ceramic
V
CA
P
L1(1)
R1
10 F
Tantalum
Note
1:
As an option, instead of a hard-wired connection, an
inductor (L1) can be substituted between VDD and
AVDD to improve ADC noise rejection. The inductor
impedance should be less than 1
Ω and the inductor
capacity greater than 10 mA.
Where:
f
FCNV
2
--------------
=
f
1
2
π LC
()
-----------------------
=
L
1
2
πfC
()
----------------------
2
=
(i.e., ADC conversion rate/2)
Note 1:
R
≤ 10 kΩ is recommended. A suggested
starting value is 10 k
Ω. Ensure that the
MCLR pin VIH and VIL specifications are met.
2:
R1
≤ 470W will limit any current flowing into
MCLR from the external capacitor C, in the
event of MCLR pin breakdown, due to Elec-
trostatic Discharge (ESD) or Electrical
Overstress (EOS). Ensure that the MCLR pin
VIH and VIL specifications are met.
C
R1(2)
R(1)
VDD
MCLR
PIC24H
JP