pic32mx320f032h Microchip Technology Inc., pic32mx320f032h Datasheet - Page 18

• Manufacturer Part Number: pic32mx320f032h
• Description: 64/100-pin General Purpose And Usb 32-bit Flash Microcontrollers
• Manufacturer: Microchip Technology Inc.

PIC32MX3XX/4XX
FIGURE 2-1:
2.2.1
The use of a bulk capacitor is recommended to improve
power supply stability. Typical values range from 4.7 µF
to 47 µF. This capacitor should be located as close to
the device as possible.
2.3
2.3.1
A low-ESR (< 5 Ohms) capacitor is required on the
V
internal voltage regulator output. The V
pin must not be connected to V
10 µF capacitor, with at least a 6V rating, connected to
ground. The type can be ceramic or tantalum. Refer to
Section 28.0
additional information. This mode is enabled by
connecting the ENVREG pin to V
2.3.2
In this mode the core voltage is supplied externally
through the VDDCORE pin. A low-ESR capacitor of
10 µF is recommended on the V
is enabled by grounding the ENVREG pin.
The placement of this capacitor should be close to the
V
length not exceed one-quarter inch (6 mm). Refer to
Section 26.3 "On-Chip Voltage Regulator" for
details.
DS61143F-page 16
CAP
CAP
0.1 µF
Ceramic
C
V
BP
DD
R
/V
/V
C
DDCORE
DDCORE
R1
Capacitor on Internal Voltage
Regulator (V
BULK CAPACITORS
INTERNAL REGULATOR MODE
EXTERNAL REGULATOR MODE
10 Ω
MCLR
V
V
SS
DD
. It is recommended that the trace
"Electrical
pin, which is used to stabilize the
RECOMMENDED
MINIMUM CONNECTION
PIC32MX
CAP
0.1 µF
Ceramic
C
BP
/V
Characteristics"
DDCORE
DD
DDCORE
DD
, and must have a
.
pin. This mode
V
V
CAP
DD
SS
0.1 µF
Ceramic
C
0.1 µF
Ceramic
C
)
BP
BP
/V
0.1 µF
Ceramic
C
BP
DDCORE
Preliminary
for
2.4
The MCLR pin provides for two specific device
functions:
• Device Reset
• Device Programming and Debugging
Pulling The MCLR pin low generates a device reset.
Figure 2-2 shows a typical MCLR circuit. 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
not be adversely affected. Therefore, specific values
of R and C will need to be adjusted based on the
application and PCB requirements.
For
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:
Note 1: R ≤ 10 kΩ is recommended. A suggested
example,
2: R1 ≤ 470Ω will limit any current flowing into
3: The capacitor can be sized to prevent uninten-
Master Clear (MCLR) Pin
IH
starting value is 10 kΩ. Ensure that the MCLR
pin V
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
tional resets from brief glitches or to extend the
device reset period during POR.
and V
V
IH
DD
R
and V
JP
C
IH
as
IL
and V
) and fast signal transitions must
IL
specifications are met.
shown
EXAMPLE OF MCLR PIN
CONNECTIONS
R1
IL
© 2009 Microchip Technology Inc.
specifications are met.
MCLR
in
PIC32MX
Figure 2-2,
it
is