Microchip Technology MA330027 Data Sheet
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
DS70616G-page 32
2009-2012 Microchip Technology Inc.
FIGURE 2-1:
RECOMMENDED
MINIMUM CONNECTION
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 DSCs to supply a local
power source. The value of the tank capacitor should
be determined based on the trace resistance that con-
nects the power supply source to the device and the
maximum current drawn by the device in the applica-
tion. 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.
inches in length, it is suggested to use a tank capacitor
for integrated circuits including DSCs to supply a local
power source. The value of the tank capacitor should
be determined based on the trace resistance that con-
nects the power supply source to the device and the
maximum current drawn by the device in the applica-
tion. 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
CPU Logic Filter Capacitor
Connection (V
Connection (V
CAP
)
A low-ESR (< 1 Ohms) capacitor is required on the
V
V
CAP
pin, which is used to stabilize the voltage
regulator output voltage. The V
CAP
pin must not be
connected to V
DD
and must have a capacitor greater
than 4.7 µF (10 µF is recommended), 16V connected
to ground. The type can be ceramic or tantalum. See
additional information.
The placement of this capacitor should be close to the
V
The placement of this capacitor should be close to the
V
CAP
. It is recommended that the trace length not
exceeds one-quarter inch (6 mm). See
for details.
2.4
Master Clear (MCLR) Pin
The MCLR pin provides 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 (V
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 (V
IH
and V
IL
) 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
specific values of R and C will need to be adjusted
based on the application and PCB requirements.
For example, as shown in
, it is
recommended that the capacitor C, be isolated from
the MCLR pin during programming and debugging
operations.
Place the components as shown in
the MCLR pin during programming and debugging
operations.
Place the components as shown in
within
one-quarter inch (6 mm) from the MCLR pin.
FIGURE 2-2:
EXAMPLE OF MCLR PIN
CONNECTIONS
CONNECTIONS
dsPIC33EP/
V
DD
V
SS
V
DD
V
SS
V
SS
V
DD
AV
DD
AV
SS
V
DD
V
SS
0.1 µF
Ceramic
0.1 µF
Ceramic
0.1 µF
Ceramic
0.1 µF
Ceramic
C
R
V
DD
MCLR
0.1 µF
Ceramic
V
CA
P
L1
(2)
R1
10 µF
Tantalum
Note 1:
If the USB module is not used, V
USB3V3
must be
connected to V
DD
, as shown.
2:
As an option, instead of a hard-wired connection, an
inductor (L1) can be substituted between V
inductor (L1) can be substituted between V
DD
and
AV
DD
to improve ADC noise rejection. The inductor
impedance should be less than 1
and the inductor
capacity greater than 10 mA.
Where:
f
F
CNV
2
--------------
=
f
1
2
LC
-----------------------
=
L
1
2
f C
----------------------
2
=
(i.e., ADC conversion rate/2)
V
USB3V3(1)
PIC24EP
Note 1: R
10 k is recommended. A suggested
starting value is 10 k
. Ensure that the
MCLR pin V
IH
and V
IL
specifications are met.
2: R1
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
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.
C
R1
(2)
R
(1)
V
DD
MCLR
dsPIC33EP
JP