PIC24FJ64GA705 Datasheet, PDF (31/412 Pages) –

PIC24FJ256GA705 FAMILY
2.4 Voltage Regulator Pin (VCAP)
Note: This section applies only to PIC24FJ
devices with an on-chip voltage regulator.
Refer to Section 29.3 “On-Chip Voltage Regulator”
for details on connecting and using the on-chip
regulator.
A low-ESR (< 5Ω) capacitor is required on the VCAP pin
to stabilize the voltage regulator output voltage. The
VCAP pin must not be connected to VDD and must use a
capacitor of 10 µF connected to ground. The type can be
ceramic or tantalum. Suitable examples of capacitors
are shown in Table 2-1. Capacitors with equivalent
specifications can be used.
Designers may use Figure 2-3 to evaluate the ESR
equivalence of candidate devices.
The placement of this capacitor should be close to VCAP.
It is recommended that the trace length not exceed
0.25 inch (6 mm). Refer to Section 32.0 “Electrical
Characteristics” for additional information.
FIGURE 2-3:
10
1
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
0.1
0.01
0.001
0.01
0.1
1
10
100
Frequency (MHz)
1000 10,000
Note: Typical data measurement at +25°C, 0V DC bias.
.
TABLE 2-1: SUITABLE CAPACITOR EQUIVALENTS (0805 CASE SIZE)
Make
Part #
Nominal
Capacitance
Base Tolerance Rated Voltage
TDK
C2012X5R1E106K085AC
10 µF
±10%
25V
TDK
C2012X5R1C106K085AC
10 µF
±10%
16V
Kemet
C0805C106M4PACTU
10 µF
±10%
16V
Murata
GRM21BR61E106KA3L
10 µF
±10%
25V
Murata
GRM21BR61C106KE15
10 µF
±10%
16V
 2016 Microchip Technology Inc.
DS30010118B-page 31