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PIC18LF26J53 Datasheet(PDF) 33 Page - Microchip Technology

Part No. PIC18LF26J53
Description  28/44-Pin, High-Performance USB Microcontrollers with nanoWatt XLP Technology
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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PIC18LF26J53 Datasheet(HTML) 33 Page - Microchip Technology

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 2010 Microchip Technology Inc.
Preliminary
DS39964B-page 33
PIC18F47J53 FAMILY
2.4
Voltage Regulator Pins
(VCAP/VDDCORE)
On “F” devices, a low-ESR (< 5Ω) capacitor is required
on the VCAP/VDDCORE pin to stabilize the voltage
regulator output voltage. The VCAP/VDDCORE pin must
not be connected to VDD and must use a capacitor of 10
F connected to ground. The type can be ceramic or
tantalum.
A
suitable
example
is
the
Murata
GRM21BF50J106ZE01 (10
F, 6.3V) or equivalent.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
It is recommended that the trace length not exceed
0.25 inch (6 mm). Refer to Section 31.0 “Electrical
Characteristics” for additional information.
On “LF” devices, the VCAP/VDDCORE pin must be tied to
a voltage supply at the VDDCORE level. Refer to
Section 31.0
“Electrical
Characteristics”
for
information on VDD and VDDCORE.
Note that the “LF” versions of these devices are
provided with the voltage regulator permanently
disabled; they must always be provided with a supply
voltage on the VDDCORE pin.
FIGURE 2-3:
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
2.5
ICSP Pins
The PGC and PGD pins are used for In-Circuit Serial
Programming™ (ICSP™) and debugging purposes. It
is recommended to keep the trace length between the
ICSP connector and the ICSP pins on the device as
short as possible. If the ICSP connector is expected to
experience an ESD event, a series resistor is recom-
mended, with the value in the range of a few tens of
ohms, not to exceed 100Ω.
Pull-up resistors, series diodes, and capacitors on the
PGC and PGD pins are not recommended as they will
interfere with the programmer/debugger communica-
tions to the device. If such discrete components are an
application requirement, they should be removed from
the circuit during programming and debugging. Alter-
natively, refer to the AC/DC characteristics and timing
requirements information in the respective device
Flash programming specification for information on
capacitive loading limits, and pin input voltage high
(VIH) and input low (VIL) requirements.
For device emulation, ensure that the “Communication
Channel Select” (i.e., PGCx/PGDx pins) programmed
into the device matches the physical connections for
the ICSP to the Microchip debugger/emulator tool.
For
more
information
on
available
Microchip
development tools connection requirements, refer to
Section 30.0 “Development Support”.
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
1000 10,000
Frequency (MHz)
Note:
Data for Murata GRM21BF50J106ZE01 shown.
Measurements at 25°C, 0V DC bias.


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